EXTN(jsimd_h2v2_downsample_mmx):
push ebp
+Index: simd/jsimd_arm_neon.S
+===================================================================
+--- simd/jsimd_arm_neon.S (revision 272637)
++++ simd/jsimd_arm_neon.S (working copy)
+@@ -41,11 +41,9 @@
+ /* Supplementary macro for setting function attributes */
+ .macro asm_function fname
+ #ifdef __APPLE__
+- .func _\fname
+ .globl _\fname
+ _\fname:
+ #else
+- .func \fname
+ .global \fname
+ #ifdef __ELF__
+ .hidden \fname
+@@ -670,7 +668,6 @@
+ .unreq ROW6R
+ .unreq ROW7L
+ .unreq ROW7R
+-.endfunc
+
+
+ /*****************************************************************************/
+@@ -895,7 +892,6 @@
+ .unreq TMP2
+ .unreq TMP3
+ .unreq TMP4
+-.endfunc
+
+
+ /*****************************************************************************/
+@@ -1108,7 +1104,6 @@
+ .unreq TMP2
+ .unreq TMP3
+ .unreq TMP4
+-.endfunc
+
+ .purgem idct_helper
+
+@@ -1263,7 +1258,6 @@
+ .unreq OUTPUT_COL
+ .unreq TMP1
+ .unreq TMP2
+-.endfunc
+
+ .purgem idct_helper
+
+@@ -1547,7 +1541,6 @@
+ .unreq U
+ .unreq V
+ .unreq N
+-.endfunc
+
+ .purgem do_yuv_to_rgb
+ .purgem do_yuv_to_rgb_stage1
+@@ -1858,7 +1851,6 @@
+ .unreq U
+ .unreq V
+ .unreq N
+-.endfunc
+
+ .purgem do_rgb_to_yuv
+ .purgem do_rgb_to_yuv_stage1
+@@ -1940,7 +1932,6 @@
+ .unreq TMP2
+ .unreq TMP3
+ .unreq TMP4
+-.endfunc
+
+
+ /*****************************************************************************/
+@@ -2064,7 +2055,6 @@
+
+ .unreq DATA
+ .unreq TMP
+-.endfunc
+
+
+ /*****************************************************************************/
+@@ -2166,7 +2156,6 @@
+ .unreq CORRECTION
+ .unreq SHIFT
+ .unreq LOOP_COUNT
+-.endfunc
+
+
+ /*****************************************************************************/
+@@ -2401,7 +2390,6 @@
+ .unreq WIDTH
+ .unreq TMP
+
+-.endfunc
+
+ .purgem upsample16
+ .purgem upsample32
Index: simd/jsimd_i386.c
===================================================================
--- simd/jsimd_i386.c (revision 829)
METHODDEF(boolean)
decode_mcu (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
+Index: jchuff.c
+===================================================================
+--- jchuff.c (revision 1219)
++++ jchuff.c (revision 1220)
+@@ -22,8 +22,36 @@
+ #include "jchuff.h" /* Declarations shared with jcphuff.c */
+ #include <limits.h>
+
++/*
++ * NOTE: If USE_CLZ_INTRINSIC is defined, then clz/bsr instructions will be
++ * used for bit counting rather than the lookup table. This will reduce the
++ * memory footprint by 64k, which is important for some mobile applications
++ * that create many isolated instances of libjpeg-turbo (web browsers, for
++ * instance.) This may improve performance on some mobile platforms as well.
++ * This feature is enabled by default only on ARM processors, because some x86
++ * chips have a slow implementation of bsr, and the use of clz/bsr cannot be
++ * shown to have a significant performance impact even on the x86 chips that
++ * have a fast implementation of it. When building for ARMv6, you can
++ * explicitly disable the use of clz/bsr by adding -mthumb to the compiler
++ * flags (this defines __thumb__).
++ */
++
++/* NOTE: Both GCC and Clang define __GNUC__ */
++#if defined __GNUC__ && defined __arm__
++#if !defined __thumb__ || defined __thumb2__
++#define USE_CLZ_INTRINSIC
++#endif
++#endif
++
++#ifdef USE_CLZ_INTRINSIC
++#define JPEG_NBITS_NONZERO(x) (32 - __builtin_clz(x))
++#define JPEG_NBITS(x) (x ? JPEG_NBITS_NONZERO(x) : 0)
++#else
+ static unsigned char jpeg_nbits_table[65536];
+ static int jpeg_nbits_table_init = 0;
++#define JPEG_NBITS(x) (jpeg_nbits_table[x])
++#define JPEG_NBITS_NONZERO(x) JPEG_NBITS(x)
++#endif
+
+ #ifndef min
+ #define min(a,b) ((a)<(b)?(a):(b))
+@@ -272,6 +300,7 @@
+ dtbl->ehufsi[i] = huffsize[p];
+ }
+
++#ifndef USE_CLZ_INTRINSIC
+ if(!jpeg_nbits_table_init) {
+ for(i = 0; i < 65536; i++) {
+ int nbits = 0, temp = i;
+@@ -280,6 +309,7 @@
+ }
+ jpeg_nbits_table_init = 1;
+ }
++#endif
+ }
+
+
+@@ -482,7 +512,7 @@
+ temp2 += temp3;
+
+ /* Find the number of bits needed for the magnitude of the coefficient */
+- nbits = jpeg_nbits_table[temp];
++ nbits = JPEG_NBITS(temp);
+
+ /* Emit the Huffman-coded symbol for the number of bits */
+ code = dctbl->ehufco[nbits];
+@@ -516,7 +546,7 @@
+ temp ^= temp3; \
+ temp -= temp3; \
+ temp2 += temp3; \
+- nbits = jpeg_nbits_table[temp]; \
++ nbits = JPEG_NBITS_NONZERO(temp); \
+ /* if run length > 15, must emit special run-length-16 codes (0xF0) */ \
+ while (r > 15) { \
+ EMIT_BITS(code_0xf0, size_0xf0) \
+Index: simd/jsimd_arm64.c
+===================================================================
+--- /dev/null
++++ simd/jsimd_arm64.c
+@@ -0,0 +1,544 @@
++/*
++ * jsimd_arm64.c
++ *
++ * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
++ * Copyright 2009-2011, 2013-2014 D. R. Commander
++ *
++ * Based on the x86 SIMD extension for IJG JPEG library,
++ * Copyright (C) 1999-2006, MIYASAKA Masaru.
++ * For conditions of distribution and use, see copyright notice in jsimdext.inc
++ *
++ * This file contains the interface between the "normal" portions
++ * of the library and the SIMD implementations when running on a
++ * 64-bit ARM architecture.
++ */
++
++#define JPEG_INTERNALS
++#include "../jinclude.h"
++#include "../jpeglib.h"
++#include "../jsimd.h"
++#include "../jdct.h"
++#include "../jsimddct.h"
++#include "jsimd.h"
++
++#include <stdio.h>
++#include <string.h>
++#include <ctype.h>
++
++static unsigned int simd_support = ~0;
++
++/*
++ * Check what SIMD accelerations are supported.
++ *
++ * FIXME: This code is racy under a multi-threaded environment.
++ */
++
++/*
++ * ARMv8 architectures support NEON extensions by default.
++ * It is no longer optional as it was with ARMv7.
++ */
++
++
++LOCAL(void)
++init_simd (void)
++{
++ char *env = NULL;
++
++ if (simd_support != ~0U)
++ return;
++
++ simd_support = 0;
++
++ simd_support |= JSIMD_ARM_NEON;
++
++ /* Force different settings through environment variables */
++ env = getenv("JSIMD_FORCENEON");
++ if ((env != NULL) && (strcmp(env, "1") == 0))
++ simd_support &= JSIMD_ARM_NEON;
++ env = getenv("JSIMD_FORCENONE");
++ if ((env != NULL) && (strcmp(env, "1") == 0))
++ simd_support = 0;
++}
++
++GLOBAL(int)
++jsimd_can_rgb_ycc (void)
++{
++ init_simd();
++
++ return 0;
++}
++
++GLOBAL(int)
++jsimd_can_rgb_gray (void)
++{
++ init_simd();
++
++ return 0;
++}
++
++GLOBAL(int)
++jsimd_can_ycc_rgb (void)
++{
++ init_simd();
++
++ /* The code is optimised for these values only */
++ if (BITS_IN_JSAMPLE != 8)
++ return 0;
++ if (sizeof(JDIMENSION) != 4)
++ return 0;
++ if ((RGB_PIXELSIZE != 3) && (RGB_PIXELSIZE != 4))
++ return 0;
++
++ if (simd_support & JSIMD_ARM_NEON)
++ return 1;
++
++ return 0;
++}
++
++GLOBAL(int)
++jsimd_can_ycc_rgb565 (void)
++{
++ init_simd();
++
++ /* The code is optimised for these values only */
++ if (BITS_IN_JSAMPLE != 8)
++ return 0;
++ if (sizeof(JDIMENSION) != 4)
++ return 0;
++
++ if (simd_support & JSIMD_ARM_NEON)
++ return 1;
++
++ return 0;
++}
++
++GLOBAL(void)
++jsimd_rgb_ycc_convert (j_compress_ptr cinfo,
++ JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
++ JDIMENSION output_row, int num_rows)
++{
++}
++
++GLOBAL(void)
++jsimd_rgb_gray_convert (j_compress_ptr cinfo,
++ JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
++ JDIMENSION output_row, int num_rows)
++{
++}
++
++GLOBAL(void)
++jsimd_ycc_rgb_convert (j_decompress_ptr cinfo,
++ JSAMPIMAGE input_buf, JDIMENSION input_row,
++ JSAMPARRAY output_buf, int num_rows)
++{
++ void (*neonfct)(JDIMENSION, JSAMPIMAGE, JDIMENSION, JSAMPARRAY, int);
++
++ switch(cinfo->out_color_space) {
++ case JCS_EXT_RGB:
++ neonfct=jsimd_ycc_extrgb_convert_neon;
++ break;
++ case JCS_EXT_RGBX:
++ case JCS_EXT_RGBA:
++ neonfct=jsimd_ycc_extrgbx_convert_neon;
++ break;
++ case JCS_EXT_BGR:
++ neonfct=jsimd_ycc_extbgr_convert_neon;
++ break;
++ case JCS_EXT_BGRX:
++ case JCS_EXT_BGRA:
++ neonfct=jsimd_ycc_extbgrx_convert_neon;
++ break;
++ case JCS_EXT_XBGR:
++ case JCS_EXT_ABGR:
++ neonfct=jsimd_ycc_extxbgr_convert_neon;
++ break;
++ case JCS_EXT_XRGB:
++ case JCS_EXT_ARGB:
++ neonfct=jsimd_ycc_extxrgb_convert_neon;
++ break;
++ default:
++ neonfct=jsimd_ycc_extrgb_convert_neon;
++ break;
++ }
++
++ if (simd_support & JSIMD_ARM_NEON)
++ neonfct(cinfo->output_width, input_buf, input_row, output_buf, num_rows);
++}
++
++GLOBAL(void)
++jsimd_ycc_rgb565_convert (j_decompress_ptr cinfo,
++ JSAMPIMAGE input_buf, JDIMENSION input_row,
++ JSAMPARRAY output_buf, int num_rows)
++{
++ if (simd_support & JSIMD_ARM_NEON)
++ jsimd_ycc_rgb565_convert_neon(cinfo->output_width, input_buf, input_row,
++ output_buf, num_rows);
++}
++
++GLOBAL(int)
++jsimd_can_h2v2_downsample (void)
++{
++ init_simd();
++
++ return 0;
++}
++
++GLOBAL(int)
++jsimd_can_h2v1_downsample (void)
++{
++ init_simd();
++
++ return 0;
++}
++
++GLOBAL(void)
++jsimd_h2v2_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
++ JSAMPARRAY input_data, JSAMPARRAY output_data)
++{
++}
++
++GLOBAL(void)
++jsimd_h2v1_downsample (j_compress_ptr cinfo, jpeg_component_info * compptr,
++ JSAMPARRAY input_data, JSAMPARRAY output_data)
++{
++}
++
++GLOBAL(int)
++jsimd_can_h2v2_upsample (void)
++{
++ init_simd();
++
++ return 0;
++}
++
++GLOBAL(int)
++jsimd_can_h2v1_upsample (void)
++{
++ init_simd();
++
++ return 0;
++}
++
++GLOBAL(void)
++jsimd_h2v2_upsample (j_decompress_ptr cinfo,
++ jpeg_component_info * compptr,
++ JSAMPARRAY input_data,
++ JSAMPARRAY * output_data_ptr)
++{
++}
++
++GLOBAL(void)
++jsimd_h2v1_upsample (j_decompress_ptr cinfo,
++ jpeg_component_info * compptr,
++ JSAMPARRAY input_data,
++ JSAMPARRAY * output_data_ptr)
++{
++}
++
++GLOBAL(int)
++jsimd_can_h2v2_fancy_upsample (void)
++{
++ init_simd();
++
++ return 0;
++}
++
++GLOBAL(int)
++jsimd_can_h2v1_fancy_upsample (void)
++{
++ init_simd();
++
++ return 0;
++}
++
++GLOBAL(void)
++jsimd_h2v2_fancy_upsample (j_decompress_ptr cinfo,
++ jpeg_component_info * compptr,
++ JSAMPARRAY input_data,
++ JSAMPARRAY * output_data_ptr)
++{
++}
++
++GLOBAL(void)
++jsimd_h2v1_fancy_upsample (j_decompress_ptr cinfo,
++ jpeg_component_info * compptr,
++ JSAMPARRAY input_data,
++ JSAMPARRAY * output_data_ptr)
++{
++}
++
++GLOBAL(int)
++jsimd_can_h2v2_merged_upsample (void)
++{
++ init_simd();
++
++ return 0;
++}
++
++GLOBAL(int)
++jsimd_can_h2v1_merged_upsample (void)
++{
++ init_simd();
++
++ return 0;
++}
++
++GLOBAL(void)
++jsimd_h2v2_merged_upsample (j_decompress_ptr cinfo,
++ JSAMPIMAGE input_buf,
++ JDIMENSION in_row_group_ctr,
++ JSAMPARRAY output_buf)
++{
++}
++
++GLOBAL(void)
++jsimd_h2v1_merged_upsample (j_decompress_ptr cinfo,
++ JSAMPIMAGE input_buf,
++ JDIMENSION in_row_group_ctr,
++ JSAMPARRAY output_buf)
++{
++}
++
++GLOBAL(int)
++jsimd_can_convsamp (void)
++{
++ init_simd();
++
++ return 0;
++}
++
++GLOBAL(int)
++jsimd_can_convsamp_float (void)
++{
++ init_simd();
++
++ return 0;
++}
++
++GLOBAL(void)
++jsimd_convsamp (JSAMPARRAY sample_data, JDIMENSION start_col,
++ DCTELEM * workspace)
++{
++}
++
++GLOBAL(void)
++jsimd_convsamp_float (JSAMPARRAY sample_data, JDIMENSION start_col,
++ FAST_FLOAT * workspace)
++{
++}
++
++GLOBAL(int)
++jsimd_can_fdct_islow (void)
++{
++ init_simd();
++
++ return 0;
++}
++
++GLOBAL(int)
++jsimd_can_fdct_ifast (void)
++{
++ init_simd();
++
++ return 0;
++}
++
++GLOBAL(int)
++jsimd_can_fdct_float (void)
++{
++ init_simd();
++
++ return 0;
++}
++
++GLOBAL(void)
++jsimd_fdct_islow (DCTELEM * data)
++{
++}
++
++GLOBAL(void)
++jsimd_fdct_ifast (DCTELEM * data)
++{
++}
++
++GLOBAL(void)
++jsimd_fdct_float (FAST_FLOAT * data)
++{
++}
++
++GLOBAL(int)
++jsimd_can_quantize (void)
++{
++ init_simd();
++
++ return 0;
++}
++
++GLOBAL(int)
++jsimd_can_quantize_float (void)
++{
++ init_simd();
++
++ return 0;
++}
++
++GLOBAL(void)
++jsimd_quantize (JCOEFPTR coef_block, DCTELEM * divisors,
++ DCTELEM * workspace)
++{
++}
++
++GLOBAL(void)
++jsimd_quantize_float (JCOEFPTR coef_block, FAST_FLOAT * divisors,
++ FAST_FLOAT * workspace)
++{
++}
++
++GLOBAL(int)
++jsimd_can_idct_2x2 (void)
++{
++ init_simd();
++
++ /* The code is optimised for these values only */
++ if (DCTSIZE != 8)
++ return 0;
++ if (sizeof(JCOEF) != 2)
++ return 0;
++ if (BITS_IN_JSAMPLE != 8)
++ return 0;
++ if (sizeof(JDIMENSION) != 4)
++ return 0;
++ if (sizeof(ISLOW_MULT_TYPE) != 2)
++ return 0;
++
++ if (simd_support & JSIMD_ARM_NEON)
++ return 1;
++
++ return 0;
++}
++
++GLOBAL(int)
++jsimd_can_idct_4x4 (void)
++{
++ init_simd();
++
++ /* The code is optimised for these values only */
++ if (DCTSIZE != 8)
++ return 0;
++ if (sizeof(JCOEF) != 2)
++ return 0;
++ if (BITS_IN_JSAMPLE != 8)
++ return 0;
++ if (sizeof(JDIMENSION) != 4)
++ return 0;
++ if (sizeof(ISLOW_MULT_TYPE) != 2)
++ return 0;
++
++ if (simd_support & JSIMD_ARM_NEON)
++ return 1;
++
++ return 0;
++}
++
++GLOBAL(void)
++jsimd_idct_2x2 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
++ JCOEFPTR coef_block, JSAMPARRAY output_buf,
++ JDIMENSION output_col)
++{
++ if (simd_support & JSIMD_ARM_NEON)
++ jsimd_idct_2x2_neon(compptr->dct_table, coef_block, output_buf,
++ output_col);
++}
++
++GLOBAL(void)
++jsimd_idct_4x4 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
++ JCOEFPTR coef_block, JSAMPARRAY output_buf,
++ JDIMENSION output_col)
++{
++ if (simd_support & JSIMD_ARM_NEON)
++ jsimd_idct_4x4_neon(compptr->dct_table, coef_block, output_buf,
++ output_col);
++}
++
++GLOBAL(int)
++jsimd_can_idct_islow (void)
++{
++ init_simd();
++
++ /* The code is optimised for these values only */
++ if (DCTSIZE != 8)
++ return 0;
++ if (sizeof(JCOEF) != 2)
++ return 0;
++ if (BITS_IN_JSAMPLE != 8)
++ return 0;
++ if (sizeof(JDIMENSION) != 4)
++ return 0;
++ if (sizeof(ISLOW_MULT_TYPE) != 2)
++ return 0;
++
++ if (simd_support & JSIMD_ARM_NEON)
++ return 1;
++
++ return 0;
++}
++
++GLOBAL(int)
++jsimd_can_idct_ifast (void)
++{
++ init_simd();
++
++ /* The code is optimised for these values only */
++ if (DCTSIZE != 8)
++ return 0;
++ if (sizeof(JCOEF) != 2)
++ return 0;
++ if (BITS_IN_JSAMPLE != 8)
++ return 0;
++ if (sizeof(JDIMENSION) != 4)
++ return 0;
++ if (sizeof(IFAST_MULT_TYPE) != 2)
++ return 0;
++ if (IFAST_SCALE_BITS != 2)
++ return 0;
++
++ if (simd_support & JSIMD_ARM_NEON)
++ return 1;
++
++ return 0;
++}
++
++GLOBAL(int)
++jsimd_can_idct_float (void)
++{
++ init_simd();
++
++ return 0;
++}
++
++GLOBAL(void)
++jsimd_idct_islow (j_decompress_ptr cinfo, jpeg_component_info * compptr,
++ JCOEFPTR coef_block, JSAMPARRAY output_buf,
++ JDIMENSION output_col)
++{
++ if (simd_support & JSIMD_ARM_NEON)
++ jsimd_idct_islow_neon(compptr->dct_table, coef_block, output_buf,
++ output_col);
++}
++
++GLOBAL(void)
++jsimd_idct_ifast (j_decompress_ptr cinfo, jpeg_component_info * compptr,
++ JCOEFPTR coef_block, JSAMPARRAY output_buf,
++ JDIMENSION output_col)
++{
++ if (simd_support & JSIMD_ARM_NEON)
++ jsimd_idct_ifast_neon(compptr->dct_table, coef_block, output_buf,
++ output_col);
++}
++
++GLOBAL(void)
++jsimd_idct_float (j_decompress_ptr cinfo, jpeg_component_info * compptr,
++ JCOEFPTR coef_block, JSAMPARRAY output_buf,
++ JDIMENSION output_col)
++{
++}
+Index: simd/jsimd_arm64_neon.S
+new file mode 100644
+===================================================================
+--- /dev/null
++++ simd/jsimd_arm64_neon.S
+@@ -0,0 +1,1861 @@
++/*
++ * ARMv8 NEON optimizations for libjpeg-turbo
++ *
++ * Copyright (C) 2009-2011 Nokia Corporation and/or its subsidiary(-ies).
++ * All rights reserved.
++ * Author: Siarhei Siamashka <siarhei.siamashka@nokia.com>
++ * Copyright (C) 2013-2014, Linaro Limited
++ * Author: Ragesh Radhakrishnan <ragesh.r@linaro.org>
++ *
++ * This software is provided 'as-is', without any express or implied
++ * warranty. In no event will the authors be held liable for any damages
++ * arising from the use of this software.
++ *
++ * Permission is granted to anyone to use this software for any purpose,
++ * including commercial applications, and to alter it and redistribute it
++ * freely, subject to the following restrictions:
++ *
++ * 1. The origin of this software must not be misrepresented; you must not
++ * claim that you wrote the original software. If you use this software
++ * in a product, an acknowledgment in the product documentation would be
++ * appreciated but is not required.
++ * 2. Altered source versions must be plainly marked as such, and must not be
++ * misrepresented as being the original software.
++ * 3. This notice may not be removed or altered from any source distribution.
++ */
++
++#if defined(__linux__) && defined(__ELF__)
++.section .note.GNU-stack,"",%progbits /* mark stack as non-executable */
++#endif
++
++.text
++.arch armv8-a+fp+simd
++
++
++#define RESPECT_STRICT_ALIGNMENT 1
++
++
++/*****************************************************************************/
++
++/* Supplementary macro for setting function attributes */
++.macro asm_function fname
++#ifdef __APPLE__
++ .globl _\fname
++_\fname:
++#else
++ .global \fname
++#ifdef __ELF__
++ .hidden \fname
++ .type \fname, %function
++#endif
++\fname:
++#endif
++.endm
++
++/* Transpose elements of single 128 bit registers */
++.macro transpose_single x0,x1,xi,xilen,literal
++ ins \xi\xilen[0], \x0\xilen[0]
++ ins \x1\xilen[0], \x0\xilen[1]
++ trn1 \x0\literal, \x0\literal, \x1\literal
++ trn2 \x1\literal, \xi\literal, \x1\literal
++.endm
++
++/* Transpose elements of 2 differnet registers */
++.macro transpose x0,x1,xi,xilen,literal
++ mov \xi\xilen, \x0\xilen
++ trn1 \x0\literal, \x0\literal, \x1\literal
++ trn2 \x1\literal, \xi\literal, \x1\literal
++.endm
++
++/* Transpose a block of 4x4 coefficients in four 64-bit registers */
++.macro transpose_4x4_32 x0,x0len x1,x1len x2,x2len x3,x3len,xi,xilen
++ mov \xi\xilen, \x0\xilen
++ trn1 \x0\x0len, \x0\x0len, \x2\x2len
++ trn2 \x2\x2len, \xi\x0len, \x2\x2len
++ mov \xi\xilen, \x1\xilen
++ trn1 \x1\x1len, \x1\x1len, \x3\x3len
++ trn2 \x3\x3len, \xi\x1len, \x3\x3len
++.endm
++
++.macro transpose_4x4_16 x0,x0len x1,x1len, x2,x2len, x3,x3len,xi,xilen
++ mov \xi\xilen, \x0\xilen
++ trn1 \x0\x0len, \x0\x0len, \x1\x1len
++ trn2 \x1\x2len, \xi\x0len, \x1\x2len
++ mov \xi\xilen, \x2\xilen
++ trn1 \x2\x2len, \x2\x2len, \x3\x3len
++ trn2 \x3\x2len, \xi\x1len, \x3\x3len
++.endm
++
++.macro transpose_4x4 x0, x1, x2, x3,x5
++ transpose_4x4_16 \x0,.4h, \x1,.4h, \x2,.4h,\x3,.4h,\x5,.16b
++ transpose_4x4_32 \x0,.2s, \x1,.2s, \x2,.2s,\x3,.2s,\x5,.16b
++.endm
++
++
++#define CENTERJSAMPLE 128
++
++/*****************************************************************************/
++
++/*
++ * Perform dequantization and inverse DCT on one block of coefficients.
++ *
++ * GLOBAL(void)
++ * jsimd_idct_islow_neon (void * dct_table, JCOEFPTR coef_block,
++ * JSAMPARRAY output_buf, JDIMENSION output_col)
++ */
++
++#define FIX_0_298631336 (2446)
++#define FIX_0_390180644 (3196)
++#define FIX_0_541196100 (4433)
++#define FIX_0_765366865 (6270)
++#define FIX_0_899976223 (7373)
++#define FIX_1_175875602 (9633)
++#define FIX_1_501321110 (12299)
++#define FIX_1_847759065 (15137)
++#define FIX_1_961570560 (16069)
++#define FIX_2_053119869 (16819)
++#define FIX_2_562915447 (20995)
++#define FIX_3_072711026 (25172)
++
++#define FIX_1_175875602_MINUS_1_961570560 (FIX_1_175875602 - FIX_1_961570560)
++#define FIX_1_175875602_MINUS_0_390180644 (FIX_1_175875602 - FIX_0_390180644)
++#define FIX_0_541196100_MINUS_1_847759065 (FIX_0_541196100 - FIX_1_847759065)
++#define FIX_3_072711026_MINUS_2_562915447 (FIX_3_072711026 - FIX_2_562915447)
++#define FIX_0_298631336_MINUS_0_899976223 (FIX_0_298631336 - FIX_0_899976223)
++#define FIX_1_501321110_MINUS_0_899976223 (FIX_1_501321110 - FIX_0_899976223)
++#define FIX_2_053119869_MINUS_2_562915447 (FIX_2_053119869 - FIX_2_562915447)
++#define FIX_0_541196100_PLUS_0_765366865 (FIX_0_541196100 + FIX_0_765366865)
++
++/*
++ * Reference SIMD-friendly 1-D ISLOW iDCT C implementation.
++ * Uses some ideas from the comments in 'simd/jiss2int-64.asm'
++ */
++#define REF_1D_IDCT(xrow0, xrow1, xrow2, xrow3, xrow4, xrow5, xrow6, xrow7) \
++{ \
++ DCTELEM row0, row1, row2, row3, row4, row5, row6, row7; \
++ INT32 q1, q2, q3, q4, q5, q6, q7; \
++ INT32 tmp11_plus_tmp2, tmp11_minus_tmp2; \
++ \
++ /* 1-D iDCT input data */ \
++ row0 = xrow0; \
++ row1 = xrow1; \
++ row2 = xrow2; \
++ row3 = xrow3; \
++ row4 = xrow4; \
++ row5 = xrow5; \
++ row6 = xrow6; \
++ row7 = xrow7; \
++ \
++ q5 = row7 + row3; \
++ q4 = row5 + row1; \
++ q6 = MULTIPLY(q5, FIX_1_175875602_MINUS_1_961570560) + \
++ MULTIPLY(q4, FIX_1_175875602); \
++ q7 = MULTIPLY(q5, FIX_1_175875602) + \
++ MULTIPLY(q4, FIX_1_175875602_MINUS_0_390180644); \
++ q2 = MULTIPLY(row2, FIX_0_541196100) + \
++ MULTIPLY(row6, FIX_0_541196100_MINUS_1_847759065); \
++ q4 = q6; \
++ q3 = ((INT32) row0 - (INT32) row4) << 13; \
++ q6 += MULTIPLY(row5, -FIX_2_562915447) + \
++ MULTIPLY(row3, FIX_3_072711026_MINUS_2_562915447); \
++ /* now we can use q1 (reloadable constants have been used up) */ \
++ q1 = q3 + q2; \
++ q4 += MULTIPLY(row7, FIX_0_298631336_MINUS_0_899976223) + \
++ MULTIPLY(row1, -FIX_0_899976223); \
++ q5 = q7; \
++ q1 = q1 + q6; \
++ q7 += MULTIPLY(row7, -FIX_0_899976223) + \
++ MULTIPLY(row1, FIX_1_501321110_MINUS_0_899976223); \
++ \
++ /* (tmp11 + tmp2) has been calculated (out_row1 before descale) */ \
++ tmp11_plus_tmp2 = q1; \
++ row1 = 0; \
++ \
++ q1 = q1 - q6; \
++ q5 += MULTIPLY(row5, FIX_2_053119869_MINUS_2_562915447) + \
++ MULTIPLY(row3, -FIX_2_562915447); \
++ q1 = q1 - q6; \
++ q6 = MULTIPLY(row2, FIX_0_541196100_PLUS_0_765366865) + \
++ MULTIPLY(row6, FIX_0_541196100); \
++ q3 = q3 - q2; \
++ \
++ /* (tmp11 - tmp2) has been calculated (out_row6 before descale) */ \
++ tmp11_minus_tmp2 = q1; \
++ \
++ q1 = ((INT32) row0 + (INT32) row4) << 13; \
++ q2 = q1 + q6; \
++ q1 = q1 - q6; \
++ \
++ /* pick up the results */ \
++ tmp0 = q4; \
++ tmp1 = q5; \
++ tmp2 = (tmp11_plus_tmp2 - tmp11_minus_tmp2) / 2; \
++ tmp3 = q7; \
++ tmp10 = q2; \
++ tmp11 = (tmp11_plus_tmp2 + tmp11_minus_tmp2) / 2; \
++ tmp12 = q3; \
++ tmp13 = q1; \
++}
++
++#define XFIX_0_899976223 v0.4h[0]
++#define XFIX_0_541196100 v0.4h[1]
++#define XFIX_2_562915447 v0.4h[2]
++#define XFIX_0_298631336_MINUS_0_899976223 v0.4h[3]
++#define XFIX_1_501321110_MINUS_0_899976223 v1.4h[0]
++#define XFIX_2_053119869_MINUS_2_562915447 v1.4h[1]
++#define XFIX_0_541196100_PLUS_0_765366865 v1.4h[2]
++#define XFIX_1_175875602 v1.4h[3]
++#define XFIX_1_175875602_MINUS_0_390180644 v2.4h[0]
++#define XFIX_0_541196100_MINUS_1_847759065 v2.4h[1]
++#define XFIX_3_072711026_MINUS_2_562915447 v2.4h[2]
++#define XFIX_1_175875602_MINUS_1_961570560 v2.4h[3]
++
++.balign 16
++jsimd_idct_islow_neon_consts:
++ .short FIX_0_899976223 /* d0[0] */
++ .short FIX_0_541196100 /* d0[1] */
++ .short FIX_2_562915447 /* d0[2] */
++ .short FIX_0_298631336_MINUS_0_899976223 /* d0[3] */
++ .short FIX_1_501321110_MINUS_0_899976223 /* d1[0] */
++ .short FIX_2_053119869_MINUS_2_562915447 /* d1[1] */
++ .short FIX_0_541196100_PLUS_0_765366865 /* d1[2] */
++ .short FIX_1_175875602 /* d1[3] */
++ /* reloadable constants */
++ .short FIX_1_175875602_MINUS_0_390180644 /* d2[0] */
++ .short FIX_0_541196100_MINUS_1_847759065 /* d2[1] */
++ .short FIX_3_072711026_MINUS_2_562915447 /* d2[2] */
++ .short FIX_1_175875602_MINUS_1_961570560 /* d2[3] */
++
++asm_function jsimd_idct_islow_neon
++
++ DCT_TABLE .req x0
++ COEF_BLOCK .req x1
++ OUTPUT_BUF .req x2
++ OUTPUT_COL .req x3
++ TMP1 .req x0
++ TMP2 .req x1
++ TMP3 .req x2
++ TMP4 .req x15
++
++ ROW0L .req v16
++ ROW0R .req v17
++ ROW1L .req v18
++ ROW1R .req v19
++ ROW2L .req v20
++ ROW2R .req v21
++ ROW3L .req v22
++ ROW3R .req v23
++ ROW4L .req v24
++ ROW4R .req v25
++ ROW5L .req v26
++ ROW5R .req v27
++ ROW6L .req v28
++ ROW6R .req v29
++ ROW7L .req v30
++ ROW7R .req v31
++ /* Save all NEON registers and x15 (32 NEON registers * 8 bytes + 16) */
++ sub sp, sp, 272
++ str x15, [sp], 16
++ adr x15, jsimd_idct_islow_neon_consts
++ st1 {v0.8b - v3.8b}, [sp], 32
++ st1 {v4.8b - v7.8b}, [sp], 32
++ st1 {v8.8b - v11.8b}, [sp], 32
++ st1 {v12.8b - v15.8b}, [sp], 32
++ st1 {v16.8b - v19.8b}, [sp], 32
++ st1 {v20.8b - v23.8b}, [sp], 32
++ st1 {v24.8b - v27.8b}, [sp], 32
++ st1 {v28.8b - v31.8b}, [sp], 32
++ ld1 {v16.4h, v17.4h, v18.4h, v19.4h}, [COEF_BLOCK], 32
++ ld1 {v0.4h, v1.4h, v2.4h, v3.4h}, [DCT_TABLE], 32
++ ld1 {v20.4h, v21.4h, v22.4h, v23.4h}, [COEF_BLOCK], 32
++ mul v16.4h, v16.4h, v0.4h
++ mul v17.4h, v17.4h, v1.4h
++ ins v16.2d[1], v17.2d[0] /* 128 bit q8 */
++ ld1 {v4.4h, v5.4h, v6.4h, v7.4h}, [DCT_TABLE], 32
++ mul v18.4h, v18.4h, v2.4h
++ mul v19.4h, v19.4h, v3.4h
++ ins v18.2d[1], v19.2d[0] /* 128 bit q9 */
++ ld1 {v24.4h, v25.4h, v26.4h, v27.4h}, [COEF_BLOCK], 32
++ mul v20.4h, v20.4h, v4.4h
++ mul v21.4h, v21.4h, v5.4h
++ ins v20.2d[1], v21.2d[0] /* 128 bit q10 */
++ ld1 {v0.4h, v1.4h, v2.4h, v3.4h}, [DCT_TABLE], 32
++ mul v22.4h, v22.4h, v6.4h
++ mul v23.4h, v23.4h, v7.4h
++ ins v22.2d[1], v23.2d[0] /* 128 bit q11 */
++ ld1 {v28.4h, v29.4h, v30.4h, v31.4h}, [COEF_BLOCK]
++ mul v24.4h, v24.4h, v0.4h
++ mul v25.4h, v25.4h, v1.4h
++ ins v24.2d[1], v25.2d[0] /* 128 bit q12 */
++ ld1 {v4.4h, v5.4h, v6.4h, v7.4h}, [DCT_TABLE], 32
++ mul v28.4h, v28.4h, v4.4h
++ mul v29.4h, v29.4h, v5.4h
++ ins v28.2d[1], v29.2d[0] /* 128 bit q14 */
++ mul v26.4h, v26.4h, v2.4h
++ mul v27.4h, v27.4h, v3.4h
++ ins v26.2d[1], v27.2d[0] /* 128 bit q13 */
++ ld1 {v0.4h, v1.4h, v2.4h, v3.4h}, [x15] /* load constants */
++ add x15, x15, #16
++ mul v30.4h, v30.4h, v6.4h
++ mul v31.4h, v31.4h, v7.4h
++ ins v30.2d[1], v31.2d[0] /* 128 bit q15 */
++ /* Go to the bottom of the stack */
++ sub sp, sp, 352
++ stp x4, x5, [sp], 16
++ st1 {v8.4h - v11.4h}, [sp], 32 /* save NEON registers */
++ st1 {v12.4h - v15.4h}, [sp], 32
++ /* 1-D IDCT, pass 1, left 4x8 half */
++ add v4.4h, ROW7L.4h, ROW3L.4h
++ add v5.4h, ROW5L.4h, ROW1L.4h
++ smull v12.4s, v4.4h, XFIX_1_175875602_MINUS_1_961570560
++ smlal v12.4s, v5.4h, XFIX_1_175875602
++ smull v14.4s, v4.4h, XFIX_1_175875602
++ /* Check for the zero coefficients in the right 4x8 half */
++ smlal v14.4s, v5.4h, XFIX_1_175875602_MINUS_0_390180644
++ ssubl v6.4s, ROW0L.4h, ROW4L.4h
++ ldp w4, w5, [COEF_BLOCK, #(-96 + 2 * (4 + 1 * 8))]
++ smull v4.4s, ROW2L.4h, XFIX_0_541196100
++ smlal v4.4s, ROW6L.4h, XFIX_0_541196100_MINUS_1_847759065
++ orr x0, x4, x5
++ mov v8.16b, v12.16b
++ smlsl v12.4s, ROW5L.4h, XFIX_2_562915447
++ ldp w4, w5, [COEF_BLOCK, #(-96 + 2 * (4 + 2 * 8))]
++ smlal v12.4s, ROW3L.4h, XFIX_3_072711026_MINUS_2_562915447
++ shl v6.4s, v6.4s, #13
++ orr x0, x0, x4
++ smlsl v8.4s, ROW1L.4h, XFIX_0_899976223
++ orr x0, x0 , x5
++ add v2.4s, v6.4s, v4.4s
++ ldp w4, w5, [COEF_BLOCK, #(-96 + 2 * (4 + 3 * 8))]
++ mov v10.16b, v14.16b
++ add v2.4s, v2.4s, v12.4s
++ orr x0, x0, x4
++ smlsl v14.4s, ROW7L.4h, XFIX_0_899976223
++ orr x0, x0, x5
++ smlal v14.4s, ROW1L.4h, XFIX_1_501321110_MINUS_0_899976223
++ rshrn ROW1L.4h, v2.4s, #11
++ ldp w4, w5, [COEF_BLOCK, #(-96 + 2 * (4 + 4 * 8))]
++ sub v2.4s, v2.4s, v12.4s
++ smlal v10.4s, ROW5L.4h, XFIX_2_053119869_MINUS_2_562915447
++ orr x0, x0, x4
++ smlsl v10.4s, ROW3L.4h, XFIX_2_562915447
++ orr x0, x0, x5
++ sub v2.4s, v2.4s, v12.4s
++ smull v12.4s, ROW2L.4h, XFIX_0_541196100_PLUS_0_765366865
++ ldp w4, w5, [COEF_BLOCK, #(-96 + 2 * (4 + 5 * 8))]
++ smlal v12.4s, ROW6L.4h, XFIX_0_541196100
++ sub v6.4s, v6.4s, v4.4s
++ orr x0, x0, x4
++ rshrn ROW6L.4h, v2.4s, #11
++ orr x0, x0, x5
++ add v2.4s, v6.4s, v10.4s
++ ldp w4, w5, [COEF_BLOCK, #(-96 + 2 * (4 + 6 * 8))]
++ sub v6.4s, v6.4s, v10.4s
++ saddl v10.4s, ROW0L.4h, ROW4L.4h
++ orr x0, x0, x4
++ rshrn ROW2L.4h, v2.4s, #11
++ orr x0, x0, x5
++ rshrn ROW5L.4h, v6.4s, #11
++ ldp w4, w5, [COEF_BLOCK, #(-96 + 2 * (4 + 7 * 8))]
++ shl v10.4s, v10.4s, #13
++ smlal v8.4s, ROW7L.4h, XFIX_0_298631336_MINUS_0_899976223
++ orr x0, x0, x4
++ add v4.4s, v10.4s, v12.4s
++ orr x0, x0, x5
++ cmp x0, #0 /* orrs instruction removed */
++ sub v2.4s, v10.4s, v12.4s
++ add v12.4s, v4.4s, v14.4s
++ ldp w4, w5, [COEF_BLOCK, #(-96 + 2 * (4 + 0 * 8))]
++ sub v4.4s, v4.4s, v14.4s
++ add v10.4s, v2.4s, v8.4s
++ orr x0, x4, x5
++ sub v6.4s, v2.4s, v8.4s
++ /* pop {x4, x5} */
++ sub sp, sp, 80
++ ldp x4, x5, [sp], 16
++ rshrn ROW7L.4h, v4.4s, #11
++ rshrn ROW3L.4h, v10.4s, #11
++ rshrn ROW0L.4h, v12.4s, #11
++ rshrn ROW4L.4h, v6.4s, #11
++
++ beq 3f /* Go to do some special handling for the sparse right 4x8 half */
++
++ /* 1-D IDCT, pass 1, right 4x8 half */
++ ld1 {v2.4h}, [x15] /* reload constants */
++ add v10.4h, ROW7R.4h, ROW3R.4h
++ add v8.4h, ROW5R.4h, ROW1R.4h
++ /* Transpose ROW6L <-> ROW7L (v3 available free register) */
++ transpose ROW6L, ROW7L, v3, .16b, .4h
++ smull v12.4s, v10.4h, XFIX_1_175875602_MINUS_1_961570560
++ smlal v12.4s, v8.4h, XFIX_1_175875602
++ /* Transpose ROW2L <-> ROW3L (v3 available free register) */
++ transpose ROW2L, ROW3L, v3, .16b, .4h
++ smull v14.4s, v10.4h, XFIX_1_175875602
++ smlal v14.4s, v8.4h, XFIX_1_175875602_MINUS_0_390180644
++ /* Transpose ROW0L <-> ROW1L (v3 available free register) */
++ transpose ROW0L, ROW1L, v3, .16b, .4h
++ ssubl v6.4s, ROW0R.4h, ROW4R.4h
++ smull v4.4s, ROW2R.4h, XFIX_0_541196100
++ smlal v4.4s, ROW6R.4h, XFIX_0_541196100_MINUS_1_847759065
++ /* Transpose ROW4L <-> ROW5L (v3 available free register) */
++ transpose ROW4L, ROW5L, v3, .16b, .4h
++ mov v8.16b, v12.16b
++ smlsl v12.4s, ROW5R.4h, XFIX_2_562915447
++ smlal v12.4s, ROW3R.4h, XFIX_3_072711026_MINUS_2_562915447
++ /* Transpose ROW1L <-> ROW3L (v3 available free register) */
++ transpose ROW1L, ROW3L, v3, .16b, .2s
++ shl v6.4s, v6.4s, #13
++ smlsl v8.4s, ROW1R.4h, XFIX_0_899976223
++ /* Transpose ROW4L <-> ROW6L (v3 available free register) */
++ transpose ROW4L, ROW6L, v3, .16b, .2s
++ add v2.4s, v6.4s, v4.4s
++ mov v10.16b, v14.16b
++ add v2.4s, v2.4s, v12.4s
++ /* Transpose ROW0L <-> ROW2L (v3 available free register) */
++ transpose ROW0L, ROW2L, v3, .16b, .2s
++ smlsl v14.4s, ROW7R.4h, XFIX_0_899976223
++ smlal v14.4s, ROW1R.4h, XFIX_1_501321110_MINUS_0_899976223
++ rshrn ROW1R.4h, v2.4s, #11
++ /* Transpose ROW5L <-> ROW7L (v3 available free register) */
++ transpose ROW5L, ROW7L, v3, .16b, .2s
++ sub v2.4s, v2.4s, v12.4s
++ smlal v10.4s, ROW5R.4h, XFIX_2_053119869_MINUS_2_562915447
++ smlsl v10.4s, ROW3R.4h, XFIX_2_562915447
++ sub v2.4s, v2.4s, v12.4s
++ smull v12.4s, ROW2R.4h, XFIX_0_541196100_PLUS_0_765366865
++ smlal v12.4s, ROW6R.4h, XFIX_0_541196100
++ sub v6.4s, v6.4s, v4.4s
++ rshrn ROW6R.4h, v2.4s, #11
++ add v2.4s, v6.4s, v10.4s
++ sub v6.4s, v6.4s, v10.4s
++ saddl v10.4s, ROW0R.4h, ROW4R.4h
++ rshrn ROW2R.4h, v2.4s, #11
++ rshrn ROW5R.4h, v6.4s, #11
++ shl v10.4s, v10.4s, #13
++ smlal v8.4s, ROW7R.4h, XFIX_0_298631336_MINUS_0_899976223
++ add v4.4s, v10.4s, v12.4s
++ sub v2.4s, v10.4s, v12.4s
++ add v12.4s, v4.4s, v14.4s
++ sub v4.4s, v4.4s, v14.4s
++ add v10.4s, v2.4s, v8.4s
++ sub v6.4s, v2.4s, v8.4s
++ rshrn ROW7R.4h, v4.4s, #11
++ rshrn ROW3R.4h, v10.4s, #11
++ rshrn ROW0R.4h, v12.4s, #11
++ rshrn ROW4R.4h, v6.4s, #11
++ /* Transpose right 4x8 half */
++ transpose ROW6R, ROW7R, v3, .16b, .4h
++ transpose ROW2R, ROW3R, v3, .16b, .4h
++ transpose ROW0R, ROW1R, v3, .16b, .4h
++ transpose ROW4R, ROW5R, v3, .16b, .4h
++ transpose ROW1R, ROW3R, v3, .16b, .2s
++ transpose ROW4R, ROW6R, v3, .16b, .2s
++ transpose ROW0R, ROW2R, v3, .16b, .2s
++ transpose ROW5R, ROW7R, v3, .16b, .2s
++
++1: /* 1-D IDCT, pass 2 (normal variant), left 4x8 half */
++ ld1 {v2.4h}, [x15] /* reload constants */
++ smull v12.4S, ROW1R.4h, XFIX_1_175875602 /* ROW5L.4h <-> ROW1R.4h */
++ smlal v12.4s, ROW1L.4h, XFIX_1_175875602
++ smlal v12.4s, ROW3R.4h, XFIX_1_175875602_MINUS_1_961570560 /* ROW7L.4h <-> ROW3R.4h */
++ smlal v12.4s, ROW3L.4h, XFIX_1_175875602_MINUS_1_961570560
++ smull v14.4s, ROW3R.4h, XFIX_1_175875602 /* ROW7L.4h <-> ROW3R.4h */
++ smlal v14.4s, ROW3L.4h, XFIX_1_175875602
++ smlal v14.4s, ROW1R.4h, XFIX_1_175875602_MINUS_0_390180644 /* ROW5L.4h <-> ROW1R.4h */
++ smlal v14.4s, ROW1L.4h, XFIX_1_175875602_MINUS_0_390180644
++ ssubl v6.4s, ROW0L.4h, ROW0R.4h /* ROW4L.4h <-> ROW0R.4h */
++ smull v4.4s, ROW2L.4h, XFIX_0_541196100
++ smlal v4.4s, ROW2R.4h, XFIX_0_541196100_MINUS_1_847759065 /* ROW6L.4h <-> ROW2R.4h */
++ mov v8.16b, v12.16b
++ smlsl v12.4s, ROW1R.4h, XFIX_2_562915447 /* ROW5L.4h <-> ROW1R.4h */
++ smlal v12.4s, ROW3L.4h, XFIX_3_072711026_MINUS_2_562915447
++ shl v6.4s, v6.4s, #13
++ smlsl v8.4s, ROW1L.4h, XFIX_0_899976223
++ add v2.4s, v6.4s, v4.4s
++ mov v10.16b, v14.16b
++ add v2.4s, v2.4s, v12.4s
++ smlsl v14.4s, ROW3R.4h, XFIX_0_899976223 /* ROW7L.4h <-> ROW3R.4h */
++ smlal v14.4s, ROW1L.4h, XFIX_1_501321110_MINUS_0_899976223
++ shrn ROW1L.4h, v2.4s, #16
++ sub v2.4s, v2.4s, v12.4s
++ smlal v10.4s, ROW1R.4h, XFIX_2_053119869_MINUS_2_562915447 /* ROW5L.4h <-> ROW1R.4h */
++ smlsl v10.4s, ROW3L.4h, XFIX_2_562915447
++ sub v2.4s, v2.4s, v12.4s
++ smull v12.4s, ROW2L.4h, XFIX_0_541196100_PLUS_0_765366865
++ smlal v12.4s, ROW2R.4h, XFIX_0_541196100 /* ROW6L.4h <-> ROW2R.4h */
++ sub v6.4s, v6.4s, v4.4s
++ shrn ROW2R.4h, v2.4s, #16 /* ROW6L.4h <-> ROW2R.4h */
++ add v2.4s, v6.4s, v10.4s
++ sub v6.4s, v6.4s, v10.4s
++ saddl v10.4s, ROW0L.4h, ROW0R.4h /* ROW4L.4h <-> ROW0R.4h */
++ shrn ROW2L.4h, v2.4s, #16
++ shrn ROW1R.4h, v6.4s, #16 /* ROW5L.4h <-> ROW1R.4h */
++ shl v10.4s, v10.4s, #13
++ smlal v8.4s, ROW3R.4h, XFIX_0_298631336_MINUS_0_899976223 /* ROW7L.4h <-> ROW3R.4h */
++ add v4.4s, v10.4s, v12.4s
++ sub v2.4s, v10.4s, v12.4s
++ add v12.4s, v4.4s, v14.4s
++ sub v4.4s, v4.4s, v14.4s
++ add v10.4s, v2.4s, v8.4s
++ sub v6.4s, v2.4s, v8.4s
++ shrn ROW3R.4h, v4.4s, #16 /* ROW7L.4h <-> ROW3R.4h */
++ shrn ROW3L.4h, v10.4s, #16
++ shrn ROW0L.4h, v12.4s, #16
++ shrn ROW0R.4h, v6.4s, #16 /* ROW4L.4h <-> ROW0R.4h */
++ /* 1-D IDCT, pass 2, right 4x8 half */
++ ld1 {v2.4h}, [x15] /* reload constants */
++ smull v12.4s, ROW5R.4h, XFIX_1_175875602
++ smlal v12.4s, ROW5L.4h, XFIX_1_175875602 /* ROW5L.4h <-> ROW1R.4h */
++ smlal v12.4s, ROW7R.4h, XFIX_1_175875602_MINUS_1_961570560
++ smlal v12.4s, ROW7L.4h, XFIX_1_175875602_MINUS_1_961570560 /* ROW7L.4h <-> ROW3R.4h */
++ smull v14.4s, ROW7R.4h, XFIX_1_175875602
++ smlal v14.4s, ROW7L.4h, XFIX_1_175875602 /* ROW7L.4h <-> ROW3R.4h */
++ smlal v14.4s, ROW5R.4h, XFIX_1_175875602_MINUS_0_390180644
++ smlal v14.4s, ROW5L.4h, XFIX_1_175875602_MINUS_0_390180644 /* ROW5L.4h <-> ROW1R.4h */
++ ssubl v6.4s, ROW4L.4h, ROW4R.4h /* ROW4L.4h <-> ROW0R.4h */
++ smull v4.4s, ROW6L.4h, XFIX_0_541196100 /* ROW6L.4h <-> ROW2R.4h */
++ smlal v4.4s, ROW6R.4h, XFIX_0_541196100_MINUS_1_847759065
++ mov v8.16b, v12.16b
++ smlsl v12.4s, ROW5R.4h, XFIX_2_562915447
++ smlal v12.4s, ROW7L.4h, XFIX_3_072711026_MINUS_2_562915447 /* ROW7L.4h <-> ROW3R.4h */
++ shl v6.4s, v6.4s, #13
++ smlsl v8.4s, ROW5L.4h, XFIX_0_899976223 /* ROW5L.4h <-> ROW1R.4h */
++ add v2.4s, v6.4s, v4.4s
++ mov v10.16b, v14.16b
++ add v2.4s, v2.4s, v12.4s
++ smlsl v14.4s, ROW7R.4h, XFIX_0_899976223
++ smlal v14.4s, ROW5L.4h, XFIX_1_501321110_MINUS_0_899976223 /* ROW5L.4h <-> ROW1R.4h */
++ shrn ROW5L.4h, v2.4s, #16 /* ROW5L.4h <-> ROW1R.4h */
++ sub v2.4s, v2.4s, v12.4s
++ smlal v10.4s, ROW5R.4h, XFIX_2_053119869_MINUS_2_562915447
++ smlsl v10.4s, ROW7L.4h, XFIX_2_562915447 /* ROW7L.4h <-> ROW3R.4h */
++ sub v2.4s, v2.4s, v12.4s
++ smull v12.4s, ROW6L.4h, XFIX_0_541196100_PLUS_0_765366865 /* ROW6L.4h <-> ROW2R.4h */
++ smlal v12.4s, ROW6R.4h, XFIX_0_541196100
++ sub v6.4s, v6.4s, v4.4s
++ shrn ROW6R.4h, v2.4s, #16
++ add v2.4s, v6.4s, v10.4s
++ sub v6.4s, v6.4s, v10.4s
++ saddl v10.4s, ROW4L.4h, ROW4R.4h /* ROW4L.4h <-> ROW0R.4h */
++ shrn ROW6L.4h, v2.4s, #16 /* ROW6L.4h <-> ROW2R.4h */
++ shrn ROW5R.4h, v6.4s, #16
++ shl v10.4s, v10.4s, #13
++ smlal v8.4s, ROW7R.4h, XFIX_0_298631336_MINUS_0_899976223
++ add v4.4s, v10.4s, v12.4s
++ sub v2.4s, v10.4s, v12.4s
++ add v12.4s, v4.4s, v14.4s
++ sub v4.4s, v4.4s, v14.4s
++ add v10.4s, v2.4s, v8.4s
++ sub v6.4s, v2.4s, v8.4s
++ shrn ROW7R.4h, v4.4s, #16
++ shrn ROW7L.4h, v10.4s, #16 /* ROW7L.4h <-> ROW3R.4h */
++ shrn ROW4L.4h, v12.4s, #16 /* ROW4L.4h <-> ROW0R.4h */
++ shrn ROW4R.4h, v6.4s, #16
++
++2: /* Descale to 8-bit and range limit */
++ ins v16.2d[1], v17.2d[0]
++ ins v18.2d[1], v19.2d[0]
++ ins v20.2d[1], v21.2d[0]
++ ins v22.2d[1], v23.2d[0]
++ sqrshrn v16.8b, v16.8h, #2
++ sqrshrn2 v16.16b, v18.8h, #2
++ sqrshrn v18.8b, v20.8h, #2
++ sqrshrn2 v18.16b, v22.8h, #2
++
++ /* vpop {v8.4h - d15.4h} */ /* restore NEON registers */
++ ld1 {v8.4h - v11.4h}, [sp], 32
++ ld1 {v12.4h - v15.4h}, [sp], 32
++ ins v24.2d[1], v25.2d[0]
++
++ sqrshrn v20.8b, v24.8h, #2
++ /* Transpose the final 8-bit samples and do signed->unsigned conversion */
++ /* trn1 v16.8h, v16.8h, v18.8h */
++ transpose v16, v18, v3, .16b, .8h
++ ins v26.2d[1], v27.2d[0]
++ ins v28.2d[1], v29.2d[0]
++ ins v30.2d[1], v31.2d[0]
++ sqrshrn2 v20.16b, v26.8h, #2
++ sqrshrn v22.8b, v28.8h, #2
++ movi v0.16b, #(CENTERJSAMPLE)
++ sqrshrn2 v22.16b, v30.8h, #2
++ transpose_single v16, v17, v3, .2d, .8b
++ transpose_single v18, v19, v3, .2d, .8b
++ add v16.8b, v16.8b, v0.8b
++ add v17.8b, v17.8b, v0.8b
++ add v18.8b, v18.8b, v0.8b
++ add v19.8b, v19.8b, v0.8b
++ transpose v20, v22, v3, .16b, .8h
++ /* Store results to the output buffer */
++ ldp TMP1, TMP2, [OUTPUT_BUF], 16
++ add TMP1, TMP1, OUTPUT_COL
++ add TMP2, TMP2, OUTPUT_COL
++ st1 {v16.8b}, [TMP1]
++ transpose_single v20, v21, v3, .2d, .8b
++ st1 {v17.8b}, [TMP2]
++ ldp TMP1, TMP2, [OUTPUT_BUF], 16
++ add TMP1, TMP1, OUTPUT_COL
++ add TMP2, TMP2, OUTPUT_COL
++ st1 {v18.8b}, [TMP1]
++ add v20.8b, v20.8b, v0.8b
++ add v21.8b, v21.8b, v0.8b
++ st1 {v19.8b}, [TMP2]
++ ldp TMP1, TMP2, [OUTPUT_BUF], 16
++ ldp TMP3, TMP4, [OUTPUT_BUF]
++ add TMP1, TMP1, OUTPUT_COL
++ add TMP2, TMP2, OUTPUT_COL
++ add TMP3, TMP3, OUTPUT_COL
++ add TMP4, TMP4, OUTPUT_COL
++ transpose_single v22, v23, v3, .2d, .8b
++ st1 {v20.8b}, [TMP1]
++ add v22.8b, v22.8b, v0.8b
++ add v23.8b, v23.8b, v0.8b
++ st1 {v21.8b}, [TMP2]
++ st1 {v22.8b}, [TMP3]
++ st1 {v23.8b}, [TMP4]
++ ldr x15, [sp], 16
++ ld1 {v0.8b - v3.8b}, [sp], 32
++ ld1 {v4.8b - v7.8b}, [sp], 32
++ ld1 {v8.8b - v11.8b}, [sp], 32
++ ld1 {v12.8b - v15.8b}, [sp], 32
++ ld1 {v16.8b - v19.8b}, [sp], 32
++ ld1 {v20.8b - v23.8b}, [sp], 32
++ ld1 {v24.8b - v27.8b}, [sp], 32
++ ld1 {v28.8b - v31.8b}, [sp], 32
++ blr x30
++
++3: /* Left 4x8 half is done, right 4x8 half contains mostly zeros */
++
++ /* Transpose left 4x8 half */
++ transpose ROW6L, ROW7L, v3, .16b, .4h
++ transpose ROW2L, ROW3L, v3, .16b, .4h
++ transpose ROW0L, ROW1L, v3, .16b, .4h
++ transpose ROW4L, ROW5L, v3, .16b, .4h
++ shl ROW0R.4h, ROW0R.4h, #2 /* PASS1_BITS */
++ transpose ROW1L, ROW3L, v3, .16b, .2s
++ transpose ROW4L, ROW6L, v3, .16b, .2s
++ transpose ROW0L, ROW2L, v3, .16b, .2s
++ transpose ROW5L, ROW7L, v3, .16b, .2s
++ cmp x0, #0
++ beq 4f /* Right 4x8 half has all zeros, go to 'sparse' second pass */
++
++ /* Only row 0 is non-zero for the right 4x8 half */
++ dup ROW1R.4h, ROW0R.4h[1]
++ dup ROW2R.4h, ROW0R.4h[2]
++ dup ROW3R.4h, ROW0R.4h[3]
++ dup ROW4R.4h, ROW0R.4h[0]
++ dup ROW5R.4h, ROW0R.4h[1]
++ dup ROW6R.4h, ROW0R.4h[2]
++ dup ROW7R.4h, ROW0R.4h[3]
++ dup ROW0R.4h, ROW0R.4h[0]
++ b 1b /* Go to 'normal' second pass */
++
++4: /* 1-D IDCT, pass 2 (sparse variant with zero rows 4-7), left 4x8 half */
++ ld1 {v2.4h}, [x15] /* reload constants */
++ smull v12.4s, ROW1L.4h, XFIX_1_175875602
++ smlal v12.4s, ROW3L.4h, XFIX_1_175875602_MINUS_1_961570560
++ smull v14.4s, ROW3L.4h, XFIX_1_175875602
++ smlal v14.4s, ROW1L.4h, XFIX_1_175875602_MINUS_0_390180644
++ smull v4.4s, ROW2L.4h, XFIX_0_541196100
++ sshll v6.4s, ROW0L.4h, #13
++ mov v8.16b, v12.16b
++ smlal v12.4s, ROW3L.4h, XFIX_3_072711026_MINUS_2_562915447
++ smlsl v8.4s, ROW1L.4h, XFIX_0_899976223
++ add v2.4s, v6.4s, v4.4s
++ mov v10.16b, v14.16b
++ smlal v14.4s, ROW1L.4h, XFIX_1_501321110_MINUS_0_899976223
++ add v2.4s, v2.4s, v12.4s
++ add v12.4s, v12.4s, v12.4s
++ smlsl v10.4s, ROW3L.4h, XFIX_2_562915447
++ shrn ROW1L.4h, v2.4s, #16
++ sub v2.4s, v2.4s, v12.4s
++ smull v12.4s, ROW2L.4h, XFIX_0_541196100_PLUS_0_765366865
++ sub v6.4s, v6.4s, v4.4s
++ shrn ROW2R.4h, v2.4s, #16 /* ROW6L.4h <-> ROW2R.4h */
++ add v2.4s, v6.4s, v10.4s
++ sub v6.4s, v6.4s, v10.4s
++ sshll v10.4s, ROW0L.4h, #13
++ shrn ROW2L.4h, v2.4s, #16
++ shrn ROW1R.4h, v6.4s, #16 /* ROW5L.4h <-> ROW1R.4h */
++ add v4.4s, v10.4s, v12.4s
++ sub v2.4s, v10.4s, v12.4s
++ add v12.4s, v4.4s, v14.4s
++ sub v4.4s, v4.4s, v14.4s
++ add v10.4s, v2.4s, v8.4s
++ sub v6.4s, v2.4s, v8.4s
++ shrn ROW3R.4h, v4.4s, #16 /* ROW7L.4h <-> ROW3R.4h */
++ shrn ROW3L.4h, v10.4s, #16
++ shrn ROW0L.4h, v12.4s, #16
++ shrn ROW0R.4h, v6.4s, #16 /* ROW4L.4h <-> ROW0R.4h */
++ /* 1-D IDCT, pass 2 (sparse variant with zero rows 4-7), right 4x8 half */
++ ld1 {v2.4h}, [x15] /* reload constants */
++ smull v12.4s, ROW5L.4h, XFIX_1_175875602
++ smlal v12.4s, ROW7L.4h, XFIX_1_175875602_MINUS_1_961570560
++ smull v14.4s, ROW7L.4h, XFIX_1_175875602
++ smlal v14.4s, ROW5L.4h, XFIX_1_175875602_MINUS_0_390180644
++ smull v4.4s, ROW6L.4h, XFIX_0_541196100
++ sshll v6.4s, ROW4L.4h, #13
++ mov v8.16b, v12.16b
++ smlal v12.4s, ROW7L.4h, XFIX_3_072711026_MINUS_2_562915447
++ smlsl v8.4s, ROW5L.4h, XFIX_0_899976223
++ add v2.4s, v6.4s, v4.4s
++ mov v10.16b, v14.16b
++ smlal v14.4s, ROW5L.4h, XFIX_1_501321110_MINUS_0_899976223
++ add v2.4s, v2.4s, v12.4s
++ add v12.4s, v12.4s, v12.4s
++ smlsl v10.4s, ROW7L.4h, XFIX_2_562915447
++ shrn ROW5L.4h, v2.4s, #16 /* ROW5L.4h <-> ROW1R.4h */
++ sub v2.4s, v2.4s, v12.4s
++ smull v12.4s, ROW6L.4h, XFIX_0_541196100_PLUS_0_765366865
++ sub v6.4s, v6.4s, v4.4s
++ shrn ROW6R.4h, v2.4s, #16
++ add v2.4s, v6.4s, v10.4s
++ sub v6.4s, v6.4s, v10.4s
++ sshll v10.4s, ROW4L.4h, #13
++ shrn ROW6L.4h, v2.4s, #16 /* ROW6L.4h <-> ROW2R.4h */
++ shrn ROW5R.4h, v6.4s, #16
++ add v4.4s, v10.4s, v12.4s
++ sub v2.4s, v10.4s, v12.4s
++ add v12.4s, v4.4s, v14.4s
++ sub v4.4s, v4.4s, v14.4s
++ add v10.4s, v2.4s, v8.4s
++ sub v6.4s, v2.4s, v8.4s
++ shrn ROW7R.4h, v4.4s, #16
++ shrn ROW7L.4h, v10.4s, #16 /* ROW7L.4h <-> ROW3R.4h */
++ shrn ROW4L.4h, v12.4s, #16 /* ROW4L.4h <-> ROW0R.4h */
++ shrn ROW4R.4h, v6.4s, #16
++ b 2b /* Go to epilogue */
++
++ .unreq DCT_TABLE
++ .unreq COEF_BLOCK
++ .unreq OUTPUT_BUF
++ .unreq OUTPUT_COL
++ .unreq TMP1
++ .unreq TMP2
++ .unreq TMP3
++ .unreq TMP4
++
++ .unreq ROW0L
++ .unreq ROW0R
++ .unreq ROW1L
++ .unreq ROW1R
++ .unreq ROW2L
++ .unreq ROW2R
++ .unreq ROW3L
++ .unreq ROW3R
++ .unreq ROW4L
++ .unreq ROW4R
++ .unreq ROW5L
++ .unreq ROW5R
++ .unreq ROW6L
++ .unreq ROW6R
++ .unreq ROW7L
++ .unreq ROW7R
++
++
++/*****************************************************************************/
++
++/*
++ * jsimd_idct_ifast_neon
++ *
++ * This function contains a fast, not so accurate integer implementation of
++ * the inverse DCT (Discrete Cosine Transform). It uses the same calculations
++ * and produces exactly the same output as IJG's original 'jpeg_idct_ifast'
++ * function from jidctfst.c
++ *
++ * Normally 1-D AAN DCT needs 5 multiplications and 29 additions.
++ * But in ARM NEON case some extra additions are required because VQDMULH
++ * instruction can't handle the constants larger than 1. So the expressions
++ * like "x * 1.082392200" have to be converted to "x * 0.082392200 + x",
++ * which introduces an extra addition. Overall, there are 6 extra additions
++ * per 1-D IDCT pass, totalling to 5 VQDMULH and 35 VADD/VSUB instructions.
++ */
++
++#define XFIX_1_082392200 v0.4h[0]
++#define XFIX_1_414213562 v0.4h[1]
++#define XFIX_1_847759065 v0.4h[2]
++#define XFIX_2_613125930 v0.4h[3]
++
++.balign 16
++jsimd_idct_ifast_neon_consts:
++ .short (277 * 128 - 256 * 128) /* XFIX_1_082392200 */
++ .short (362 * 128 - 256 * 128) /* XFIX_1_414213562 */
++ .short (473 * 128 - 256 * 128) /* XFIX_1_847759065 */
++ .short (669 * 128 - 512 * 128) /* XFIX_2_613125930 */
++
++asm_function jsimd_idct_ifast_neon
++
++ DCT_TABLE .req x0
++ COEF_BLOCK .req x1
++ OUTPUT_BUF .req x2
++ OUTPUT_COL .req x3
++ TMP1 .req x0
++ TMP2 .req x1
++ TMP3 .req x2
++ TMP4 .req x22
++ TMP5 .req x23
++
++ /* Load and dequantize coefficients into NEON registers
++ * with the following allocation:
++ * 0 1 2 3 | 4 5 6 7
++ * ---------+--------
++ * 0 | d16 | d17 ( v8.8h )
++ * 1 | d18 | d19 ( v9.8h )
++ * 2 | d20 | d21 ( v10.8h )
++ * 3 | d22 | d23 ( v11.8h )
++ * 4 | d24 | d25 ( v12.8h )
++ * 5 | d26 | d27 ( v13.8h )
++ * 6 | d28 | d29 ( v14.8h )
++ * 7 | d30 | d31 ( v15.8h )
++ */
++ /* Save NEON registers used in fast IDCT */
++ sub sp, sp, #176
++ stp x22, x23, [sp], 16
++ adr x23, jsimd_idct_ifast_neon_consts
++ st1 {v0.8b - v3.8b}, [sp], 32
++ st1 {v4.8b - v7.8b}, [sp], 32
++ st1 {v8.8b - v11.8b}, [sp], 32
++ st1 {v12.8b - v15.8b}, [sp], 32
++ st1 {v16.8b - v19.8b}, [sp], 32
++ ld1 {v8.8h, v9.8h}, [COEF_BLOCK], 32
++ ld1 {v0.8h, v1.8h}, [DCT_TABLE], 32
++ ld1 {v10.8h, v11.8h}, [COEF_BLOCK], 32
++ mul v8.8h, v8.8h, v0.8h
++ ld1 {v2.8h, v3.8h}, [DCT_TABLE], 32
++ mul v9.8h, v9.8h, v1.8h
++ ld1 {v12.8h, v13.8h}, [COEF_BLOCK], 32
++ mul v10.8h, v10.8h, v2.8h
++ ld1 {v0.8h, v1.8h}, [DCT_TABLE], 32
++ mul v11.8h, v11.8h, v3.8h
++ ld1 {v14.8h, v15.8h}, [COEF_BLOCK], 32
++ mul v12.8h, v12.8h, v0.8h
++ ld1 {v2.8h, v3.8h}, [DCT_TABLE], 32
++ mul v14.8h, v14.8h, v2.8h
++ mul v13.8h, v13.8h, v1.8h
++ ld1 {v0.4h}, [x23] /* load constants */
++ mul v15.8h, v15.8h, v3.8h
++
++ /* 1-D IDCT, pass 1 */
++ sub v2.8h, v10.8h, v14.8h
++ add v14.8h, v10.8h, v14.8h
++ sub v1.8h, v11.8h, v13.8h
++ add v13.8h, v11.8h, v13.8h
++ sub v5.8h, v9.8h, v15.8h
++ add v15.8h, v9.8h, v15.8h
++ sqdmulh v4.8h, v2.8h, XFIX_1_414213562
++ sqdmulh v6.8h, v1.8h, XFIX_2_613125930
++ add v3.8h, v1.8h, v1.8h
++ sub v1.8h, v5.8h, v1.8h
++ add v10.8h, v2.8h, v4.8h
++ sqdmulh v4.8h, v1.8h, XFIX_1_847759065
++ sub v2.8h, v15.8h, v13.8h
++ add v3.8h, v3.8h, v6.8h
++ sqdmulh v6.8h, v2.8h, XFIX_1_414213562
++ add v1.8h, v1.8h, v4.8h
++ sqdmulh v4.8h, v5.8h, XFIX_1_082392200
++ sub v10.8h, v10.8h, v14.8h
++ add v2.8h, v2.8h, v6.8h
++ sub v6.8h, v8.8h, v12.8h
++ add v12.8h, v8.8h, v12.8h
++ add v9.8h, v5.8h, v4.8h
++ add v5.8h, v6.8h, v10.8h
++ sub v10.8h, v6.8h, v10.8h
++ add v6.8h, v15.8h, v13.8h
++ add v8.8h, v12.8h, v14.8h
++ sub v3.8h, v6.8h, v3.8h
++ sub v12.8h, v12.8h, v14.8h
++ sub v3.8h, v3.8h, v1.8h
++ sub v1.8h, v9.8h, v1.8h
++ add v2.8h, v3.8h, v2.8h
++ sub v15.8h, v8.8h, v6.8h
++ add v1.8h, v1.8h, v2.8h
++ add v8.8h, v8.8h, v6.8h
++ add v14.8h, v5.8h, v3.8h
++ sub v9.8h, v5.8h, v3.8h
++ sub v13.8h, v10.8h, v2.8h
++ add v10.8h, v10.8h, v2.8h
++ /* Transpose q8-q9 */
++ mov v18.16b, v8.16b
++ trn1 v8.8h, v8.8h, v9.8h
++ trn2 v9.8h, v18.8h, v9.8h
++ sub v11.8h, v12.8h, v1.8h
++ /* Transpose q14-q15 */
++ mov v18.16b, v14.16b
++ trn1 v14.8h, v14.8h, v15.8h
++ trn2 v15.8h, v18.8h, v15.8h
++ add v12.8h, v12.8h, v1.8h
++ /* Transpose q10-q11 */
++ mov v18.16b, v10.16b
++ trn1 v10.8h, v10.8h, v11.8h
++ trn2 v11.8h, v18.8h, v11.8h
++ /* Transpose q12-q13 */
++ mov v18.16b, v12.16b
++ trn1 v12.8h, v12.8h, v13.8h
++ trn2 v13.8h, v18.8h, v13.8h
++ /* Transpose q9-q11 */
++ mov v18.16b, v9.16b
++ trn1 v9.4s, v9.4s, v11.4s
++ trn2 v11.4s, v18.4s, v11.4s
++ /* Transpose q12-q14 */
++ mov v18.16b, v12.16b
++ trn1 v12.4s, v12.4s, v14.4s
++ trn2 v14.4s, v18.4s, v14.4s
++ /* Transpose q8-q10 */
++ mov v18.16b, v8.16b
++ trn1 v8.4s, v8.4s, v10.4s
++ trn2 v10.4s, v18.4s, v10.4s
++ /* Transpose q13-q15 */
++ mov v18.16b, v13.16b
++ trn1 v13.4s, v13.4s, v15.4s
++ trn2 v15.4s, v18.4s, v15.4s
++ /* vswp v14.4h, v10-MSB.4h */
++ umov x22, v14.d[0]
++ ins v14.2d[0], v10.2d[1]
++ ins v10.2d[1], x22
++ /* vswp v13.4h, v9MSB.4h */
++
++ umov x22, v13.d[0]
++ ins v13.2d[0], v9.2d[1]
++ ins v9.2d[1], x22
++ /* 1-D IDCT, pass 2 */
++ sub v2.8h, v10.8h, v14.8h
++ /* vswp v15.4h, v11MSB.4h */
++ umov x22, v15.d[0]
++ ins v15.2d[0], v11.2d[1]
++ ins v11.2d[1], x22
++ add v14.8h, v10.8h, v14.8h
++ /* vswp v12.4h, v8-MSB.4h */
++ umov x22, v12.d[0]
++ ins v12.2d[0], v8.2d[1]
++ ins v8.2d[1], x22
++ sub v1.8h, v11.8h, v13.8h
++ add v13.8h, v11.8h, v13.8h
++ sub v5.8h, v9.8h, v15.8h
++ add v15.8h, v9.8h, v15.8h
++ sqdmulh v4.8h, v2.8h, XFIX_1_414213562
++ sqdmulh v6.8h, v1.8h, XFIX_2_613125930
++ add v3.8h, v1.8h, v1.8h
++ sub v1.8h, v5.8h, v1.8h
++ add v10.8h, v2.8h, v4.8h
++ sqdmulh v4.8h, v1.8h, XFIX_1_847759065
++ sub v2.8h, v15.8h, v13.8h
++ add v3.8h, v3.8h, v6.8h
++ sqdmulh v6.8h, v2.8h, XFIX_1_414213562
++ add v1.8h, v1.8h, v4.8h
++ sqdmulh v4.8h, v5.8h, XFIX_1_082392200
++ sub v10.8h, v10.8h, v14.8h
++ add v2.8h, v2.8h, v6.8h
++ sub v6.8h, v8.8h, v12.8h
++ add v12.8h, v8.8h, v12.8h
++ add v9.8h, v5.8h, v4.8h
++ add v5.8h, v6.8h, v10.8h
++ sub v10.8h, v6.8h, v10.8h
++ add v6.8h, v15.8h, v13.8h
++ add v8.8h, v12.8h, v14.8h
++ sub v3.8h, v6.8h, v3.8h
++ sub v12.8h, v12.8h, v14.8h
++ sub v3.8h, v3.8h, v1.8h
++ sub v1.8h, v9.8h, v1.8h
++ add v2.8h, v3.8h, v2.8h
++ sub v15.8h, v8.8h, v6.8h
++ add v1.8h, v1.8h, v2.8h
++ add v8.8h, v8.8h, v6.8h
++ add v14.8h, v5.8h, v3.8h
++ sub v9.8h, v5.8h, v3.8h
++ sub v13.8h, v10.8h, v2.8h
++ add v10.8h, v10.8h, v2.8h
++ sub v11.8h, v12.8h, v1.8h
++ add v12.8h, v12.8h, v1.8h
++ /* Descale to 8-bit and range limit */
++ movi v0.16b, #0x80
++ sqshrn v8.8b, v8.8h, #5
++ sqshrn2 v8.16b, v9.8h, #5
++ sqshrn v9.8b, v10.8h, #5
++ sqshrn2 v9.16b, v11.8h, #5
++ sqshrn v10.8b, v12.8h, #5
++ sqshrn2 v10.16b, v13.8h, #5
++ sqshrn v11.8b, v14.8h, #5
++ sqshrn2 v11.16b, v15.8h, #5
++ add v8.16b, v8.16b, v0.16b
++ add v9.16b, v9.16b, v0.16b
++ add v10.16b, v10.16b, v0.16b
++ add v11.16b, v11.16b, v0.16b
++ /* Transpose the final 8-bit samples */
++ /* Transpose q8-q9 */
++ mov v18.16b, v8.16b
++ trn1 v8.8h, v8.8h, v9.8h
++ trn2 v9.8h, v18.8h, v9.8h
++ /* Transpose q10-q11 */
++ mov v18.16b, v10.16b
++ trn1 v10.8h, v10.8h, v11.8h
++ trn2 v11.8h, v18.8h, v11.8h
++ /* Transpose q8-q10 */
++ mov v18.16b, v8.16b
++ trn1 v8.4s, v8.4s, v10.4s
++ trn2 v10.4s, v18.4s, v10.4s
++ /* Transpose q9-q11 */
++ mov v18.16b, v9.16b
++ trn1 v9.4s, v9.4s, v11.4s
++ trn2 v11.4s, v18.4s, v11.4s
++ /* make copy */
++ ins v17.2d[0], v8.2d[1]
++ /* Transpose d16-d17-msb */
++ mov v18.16b, v8.16b
++ trn1 v8.8b, v8.8b, v17.8b
++ trn2 v17.8b, v18.8b, v17.8b
++ /* make copy */
++ ins v19.2d[0], v9.2d[1]
++ mov v18.16b, v9.16b
++ trn1 v9.8b, v9.8b, v19.8b
++ trn2 v19.8b, v18.8b, v19.8b
++ /* Store results to the output buffer */
++ ldp TMP1, TMP2, [OUTPUT_BUF], 16
++ add TMP1, TMP1, OUTPUT_COL
++ add TMP2, TMP2, OUTPUT_COL
++ st1 {v8.8b}, [TMP1]
++ st1 {v17.8b}, [TMP2]
++ ldp TMP1, TMP2, [OUTPUT_BUF], 16
++ add TMP1, TMP1, OUTPUT_COL
++ add TMP2, TMP2, OUTPUT_COL
++ st1 {v9.8b}, [TMP1]
++ /* make copy */
++ ins v7.2d[0], v10.2d[1]
++ mov v18.16b, v10.16b
++ trn1 v10.8b, v10.8b, v7.8b
++ trn2 v7.8b, v18.8b, v7.8b
++ st1 {v19.8b}, [TMP2]
++ ldp TMP1, TMP2, [OUTPUT_BUF], 16
++ ldp TMP4, TMP5, [OUTPUT_BUF], 16
++ add TMP1, TMP1, OUTPUT_COL
++ add TMP2, TMP2, OUTPUT_COL
++ add TMP4, TMP4, OUTPUT_COL
++ add TMP5, TMP5, OUTPUT_COL
++ st1 {v10.8b}, [TMP1]
++ /* make copy */
++ ins v16.2d[0], v11.2d[1]
++ mov v18.16b, v11.16b
++ trn1 v11.8b, v11.8b, v16.8b
++ trn2 v16.8b, v18.8b, v16.8b
++ st1 {v7.8b}, [TMP2]
++ st1 {v11.8b}, [TMP4]
++ st1 {v16.8b}, [TMP5]
++ sub sp, sp, #176
++ ldp x22, x23, [sp], 16
++ ld1 {v0.8b - v3.8b}, [sp], 32
++ ld1 {v4.8b - v7.8b}, [sp], 32
++ ld1 {v8.8b - v11.8b}, [sp], 32
++ ld1 {v12.8b - v15.8b}, [sp], 32
++ ld1 {v16.8b - v19.8b}, [sp], 32
++ blr x30
++
++ .unreq DCT_TABLE
++ .unreq COEF_BLOCK
++ .unreq OUTPUT_BUF
++ .unreq OUTPUT_COL
++ .unreq TMP1
++ .unreq TMP2
++ .unreq TMP3
++ .unreq TMP4
++
++
++/*****************************************************************************/
++
++/*
++ * jsimd_idct_4x4_neon
++ *
++ * This function contains inverse-DCT code for getting reduced-size
++ * 4x4 pixels output from an 8x8 DCT block. It uses the same calculations
++ * and produces exactly the same output as IJG's original 'jpeg_idct_4x4'
++ * function from jpeg-6b (jidctred.c).
++ *
++ * NOTE: jpeg-8 has an improved implementation of 4x4 inverse-DCT, which
++ * requires much less arithmetic operations and hence should be faster.
++ * The primary purpose of this particular NEON optimized function is
++ * bit exact compatibility with jpeg-6b.
++ *
++ * TODO: a bit better instructions scheduling can be achieved by expanding
++ * idct_helper/transpose_4x4 macros and reordering instructions,
++ * but readability will suffer somewhat.
++ */
++
++#define CONST_BITS 13
++
++#define FIX_0_211164243 (1730) /* FIX(0.211164243) */
++#define FIX_0_509795579 (4176) /* FIX(0.509795579) */
++#define FIX_0_601344887 (4926) /* FIX(0.601344887) */
++#define FIX_0_720959822 (5906) /* FIX(0.720959822) */
++#define FIX_0_765366865 (6270) /* FIX(0.765366865) */
++#define FIX_0_850430095 (6967) /* FIX(0.850430095) */
++#define FIX_0_899976223 (7373) /* FIX(0.899976223) */
++#define FIX_1_061594337 (8697) /* FIX(1.061594337) */
++#define FIX_1_272758580 (10426) /* FIX(1.272758580) */
++#define FIX_1_451774981 (11893) /* FIX(1.451774981) */
++#define FIX_1_847759065 (15137) /* FIX(1.847759065) */
++#define FIX_2_172734803 (17799) /* FIX(2.172734803) */
++#define FIX_2_562915447 (20995) /* FIX(2.562915447) */
++#define FIX_3_624509785 (29692) /* FIX(3.624509785) */
++
++.balign 16
++jsimd_idct_4x4_neon_consts:
++ .short FIX_1_847759065 /* v0.4h[0] */
++ .short -FIX_0_765366865 /* v0.4h[1] */
++ .short -FIX_0_211164243 /* v0.4h[2] */
++ .short FIX_1_451774981 /* v0.4h[3] */
++ .short -FIX_2_172734803 /* d1[0] */
++ .short FIX_1_061594337 /* d1[1] */
++ .short -FIX_0_509795579 /* d1[2] */
++ .short -FIX_0_601344887 /* d1[3] */
++ .short FIX_0_899976223 /* v2.4h[0] */
++ .short FIX_2_562915447 /* v2.4h[1] */
++ .short 1 << (CONST_BITS+1) /* v2.4h[2] */
++ .short 0 /* v2.4h[3] */
++
++.macro idct_helper x4, x6, x8, x10, x12, x14, x16, shift, y26, y27, y28, y29
++ smull v28.4s, \x4, v2.4h[2]
++ smlal v28.4s, \x8, v0.4h[0]
++ smlal v28.4s, \x14, v0.4h[1]
++
++ smull v26.4s, \x16, v1.4h[2]
++ smlal v26.4s, \x12, v1.4h[3]
++ smlal v26.4s, \x10, v2.4h[0]
++ smlal v26.4s, \x6, v2.4h[1]
++
++ smull v30.4s, \x4, v2.4h[2]
++ smlsl v30.4s, \x8, v0.4h[0]
++ smlsl v30.4s, \x14, v0.4h[1]
++
++ smull v24.4s, \x16, v0.4h[2]
++ smlal v24.4s, \x12, v0.4h[3]
++ smlal v24.4s, \x10, v1.4h[0]
++ smlal v24.4s, \x6, v1.4h[1]
++
++ add v20.4s, v28.4s, v26.4s
++ sub v28.4s, v28.4s, v26.4s
++
++.if \shift > 16
++ srshr v20.4s, v20.4s, #\shift
++ srshr v28.4s, v28.4s, #\shift
++ xtn \y26, v20.4s
++ xtn \y29, v28.4s
++.else
++ rshrn \y26, v20.4s, #\shift
++ rshrn \y29, v28.4s, #\shift
++.endif
++
++ add v20.4s, v30.4s, v24.4s
++ sub v30.4s, v30.4s, v24.4s
++
++.if \shift > 16
++ srshr v20.4s, v20.4s, #\shift
++ srshr v30.4s, v30.4s, #\shift
++ xtn \y27, v20.4s
++ xtn \y28, v30.4s
++.else
++ rshrn \y27, v20.4s, #\shift
++ rshrn \y28, v30.4s, #\shift
++.endif
++
++.endm
++
++asm_function jsimd_idct_4x4_neon
++
++ DCT_TABLE .req x0
++ COEF_BLOCK .req x1
++ OUTPUT_BUF .req x2
++ OUTPUT_COL .req x3
++ TMP1 .req x0
++ TMP2 .req x1
++ TMP3 .req x2
++ TMP4 .req x15
++
++ /* Save all used NEON registers */
++ sub sp, sp, 272
++ str x15, [sp], 16
++ /* Load constants (v3.4h is just used for padding) */
++ adr TMP4, jsimd_idct_4x4_neon_consts
++ st1 {v0.8b - v3.8b}, [sp], 32
++ st1 {v4.8b - v7.8b}, [sp], 32
++ st1 {v8.8b - v11.8b}, [sp], 32
++ st1 {v12.8b - v15.8b}, [sp], 32
++ st1 {v16.8b - v19.8b}, [sp], 32
++ st1 {v20.8b - v23.8b}, [sp], 32
++ st1 {v24.8b - v27.8b}, [sp], 32
++ st1 {v28.8b - v31.8b}, [sp], 32
++ ld1 {v0.4h, v1.4h, v2.4h, v3.4h}, [TMP4]
++
++ /* Load all COEF_BLOCK into NEON registers with the following allocation:
++ * 0 1 2 3 | 4 5 6 7
++ * ---------+--------
++ * 0 | v4.4h | v5.4h
++ * 1 | v6.4h | v7.4h
++ * 2 | v8.4h | v9.4h
++ * 3 | v10.4h | v11.4h
++ * 4 | - | -
++ * 5 | v12.4h | v13.4h
++ * 6 | v14.4h | v15.4h
++ * 7 | v16.4h | v17.4h
++ */
++ ld1 {v4.4h, v5.4h, v6.4h, v7.4h}, [COEF_BLOCK], 32
++ ld1 {v8.4h, v9.4h, v10.4h, v11.4h}, [COEF_BLOCK], 32
++ add COEF_BLOCK, COEF_BLOCK, #16
++ ld1 {v12.4h, v13.4h, v14.4h, v15.4h}, [COEF_BLOCK], 32
++ ld1 {v16.4h, v17.4h}, [COEF_BLOCK], 16
++ /* dequantize */
++ ld1 {v18.4h, v19.4h, v20.4h, v21.4h}, [DCT_TABLE], 32
++ mul v4.4h, v4.4h, v18.4h
++ mul v5.4h, v5.4h, v19.4h
++ ins v4.2d[1], v5.2d[0] /* 128 bit q4 */
++ ld1 {v22.4h, v23.4h, v24.4h, v25.4h}, [DCT_TABLE], 32
++ mul v6.4h, v6.4h, v20.4h
++ mul v7.4h, v7.4h, v21.4h
++ ins v6.2d[1], v7.2d[0] /* 128 bit q6 */
++ mul v8.4h, v8.4h, v22.4h
++ mul v9.4h, v9.4h, v23.4h
++ ins v8.2d[1], v9.2d[0] /* 128 bit q8 */
++ add DCT_TABLE, DCT_TABLE, #16
++ ld1 {v26.4h, v27.4h, v28.4h, v29.4h}, [DCT_TABLE], 32
++ mul v10.4h, v10.4h, v24.4h
++ mul v11.4h, v11.4h, v25.4h
++ ins v10.2d[1], v11.2d[0] /* 128 bit q10 */
++ mul v12.4h, v12.4h, v26.4h
++ mul v13.4h, v13.4h, v27.4h
++ ins v12.2d[1], v13.2d[0] /* 128 bit q12 */
++ ld1 {v30.4h, v31.4h}, [DCT_TABLE], 16
++ mul v14.4h, v14.4h, v28.4h
++ mul v15.4h, v15.4h, v29.4h
++ ins v14.2d[1], v15.2d[0] /* 128 bit q14 */
++ mul v16.4h, v16.4h, v30.4h
++ mul v17.4h, v17.4h, v31.4h
++ ins v16.2d[1], v17.2d[0] /* 128 bit q16 */
++
++ /* Pass 1 */
++ idct_helper v4.4h, v6.4h, v8.4h, v10.4h, v12.4h, v14.4h, v16.4h, 12, v4.4h, v6.4h, v8.4h, v10.4h
++ transpose_4x4 v4, v6, v8, v10, v3
++ ins v10.2d[1], v11.2d[0]
++ idct_helper v5.4h, v7.4h, v9.4h, v11.4h, v13.4h, v15.4h, v17.4h, 12, v5.4h, v7.4h, v9.4h, v11.4h
++ transpose_4x4 v5, v7, v9, v11, v3
++ ins v10.2d[1], v11.2d[0]
++ /* Pass 2 */
++ idct_helper v4.4h, v6.4h, v8.4h, v10.4h, v7.4h, v9.4h, v11.4h, 19, v26.4h, v27.4h, v28.4h, v29.4h
++ transpose_4x4 v26, v27, v28, v29, v3
++
++ /* Range limit */
++ movi v30.8h, #0x80
++ ins v26.2d[1], v27.2d[0]
++ ins v28.2d[1], v29.2d[0]
++ add v26.8h, v26.8h, v30.8h
++ add v28.8h, v28.8h, v30.8h
++ sqxtun v26.8b, v26.8h
++ sqxtun v27.8b, v28.8h
++
++ /* Store results to the output buffer */
++ ldp TMP1, TMP2, [OUTPUT_BUF], 16
++ ldp TMP3, TMP4, [OUTPUT_BUF]
++ add TMP1, TMP1, OUTPUT_COL
++ add TMP2, TMP2, OUTPUT_COL
++ add TMP3, TMP3, OUTPUT_COL
++ add TMP4, TMP4, OUTPUT_COL
++
++#if defined(__ARMEL__) && !RESPECT_STRICT_ALIGNMENT
++ /* We can use much less instructions on little endian systems if the
++ * OS kernel is not configured to trap unaligned memory accesses
++ */
++ st1 {v26.s}[0], [TMP1], 4
++ st1 {v27.s}[0], [TMP3], 4
++ st1 {v26.s}[1], [TMP2], 4
++ st1 {v27.s}[1], [TMP4], 4
++#else
++ st1 {v26.b}[0], [TMP1], 1
++ st1 {v27.b}[0], [TMP3], 1
++ st1 {v26.b}[1], [TMP1], 1
++ st1 {v27.b}[1], [TMP3], 1
++ st1 {v26.b}[2], [TMP1], 1
++ st1 {v27.b}[2], [TMP3], 1
++ st1 {v26.b}[3], [TMP1], 1
++ st1 {v27.b}[3], [TMP3], 1
++
++ st1 {v26.b}[4], [TMP2], 1
++ st1 {v27.b}[4], [TMP4], 1
++ st1 {v26.b}[5], [TMP2], 1
++ st1 {v27.b}[5], [TMP4], 1
++ st1 {v26.b}[6], [TMP2], 1
++ st1 {v27.b}[6], [TMP4], 1
++ st1 {v26.b}[7], [TMP2], 1
++ st1 {v27.b}[7], [TMP4], 1
++#endif
++
++ /* vpop {v8.4h - v15.4h} ;not available */
++ sub sp, sp, #272
++ ldr x15, [sp], 16
++ ld1 {v0.8b - v3.8b}, [sp], 32
++ ld1 {v4.8b - v7.8b}, [sp], 32
++ ld1 {v8.8b - v11.8b}, [sp], 32
++ ld1 {v12.8b - v15.8b}, [sp], 32
++ ld1 {v16.8b - v19.8b}, [sp], 32
++ ld1 {v20.8b - v23.8b}, [sp], 32
++ ld1 {v24.8b - v27.8b}, [sp], 32
++ ld1 {v28.8b - v31.8b}, [sp], 32
++ blr x30
++
++ .unreq DCT_TABLE
++ .unreq COEF_BLOCK
++ .unreq OUTPUT_BUF
++ .unreq OUTPUT_COL
++ .unreq TMP1
++ .unreq TMP2
++ .unreq TMP3
++ .unreq TMP4
++
++.purgem idct_helper
++
++
++/*****************************************************************************/
++
++/*
++ * jsimd_idct_2x2_neon
++ *
++ * This function contains inverse-DCT code for getting reduced-size
++ * 2x2 pixels output from an 8x8 DCT block. It uses the same calculations
++ * and produces exactly the same output as IJG's original 'jpeg_idct_2x2'
++ * function from jpeg-6b (jidctred.c).
++ *
++ * NOTE: jpeg-8 has an improved implementation of 2x2 inverse-DCT, which
++ * requires much less arithmetic operations and hence should be faster.
++ * The primary purpose of this particular NEON optimized function is
++ * bit exact compatibility with jpeg-6b.
++ */
++
++.balign 8
++jsimd_idct_2x2_neon_consts:
++ .short -FIX_0_720959822 /* v14[0] */
++ .short FIX_0_850430095 /* v14[1] */
++ .short -FIX_1_272758580 /* v14[2] */
++ .short FIX_3_624509785 /* v14[3] */
++
++.macro idct_helper x4, x6, x10, x12, x16, shift, y26, y27
++ sshll v15.4s, \x4, #15
++ smull v26.4s, \x6, v14.4h[3]
++ smlal v26.4s, \x10, v14.4h[2]
++ smlal v26.4s, \x12, v14.4h[1]
++ smlal v26.4s, \x16, v14.4h[0]
++
++ add v20.4s, v15.4s, v26.4s
++ sub v15.4s, v15.4s, v26.4s
++
++.if \shift > 16
++ srshr v20.4s, v20.4s, #\shift
++ srshr v15.4s, v15.4s, #\shift
++ xtn \y26, v20.4s
++ xtn \y27, v15.4s
++.else
++ rshrn \y26, v20.4s, #\shift
++ rshrn \y27, v15.4s, #\shift
++.endif
++
++.endm
++
++asm_function jsimd_idct_2x2_neon
++
++ DCT_TABLE .req x0
++ COEF_BLOCK .req x1
++ OUTPUT_BUF .req x2
++ OUTPUT_COL .req x3
++ TMP1 .req x0
++ TMP2 .req x15
++
++ /* vpush {v8.4h - v15.4h} ; not available */
++ sub sp, sp, 208
++ str x15, [sp], 16
++
++ /* Load constants */
++ adr TMP2, jsimd_idct_2x2_neon_consts
++ st1 {v4.8b - v7.8b}, [sp], 32
++ st1 {v8.8b - v11.8b}, [sp], 32
++ st1 {v12.8b - v15.8b}, [sp], 32
++ st1 {v16.8b - v19.8b}, [sp], 32
++ st1 {v21.8b - v22.8b}, [sp], 16
++ st1 {v24.8b - v27.8b}, [sp], 32
++ st1 {v30.8b - v31.8b}, [sp], 16
++ ld1 {v14.4h}, [TMP2]
++
++ /* Load all COEF_BLOCK into NEON registers with the following allocation:
++ * 0 1 2 3 | 4 5 6 7
++ * ---------+--------
++ * 0 | v4.4h | v5.4h
++ * 1 | v6.4h | v7.4h
++ * 2 | - | -
++ * 3 | v10.4h | v11.4h
++ * 4 | - | -
++ * 5 | v12.4h | v13.4h
++ * 6 | - | -
++ * 7 | v16.4h | v17.4h
++ */
++ ld1 {v4.4h, v5.4h, v6.4h, v7.4h}, [COEF_BLOCK], 32
++ add COEF_BLOCK, COEF_BLOCK, #16
++ ld1 {v10.4h, v11.4h}, [COEF_BLOCK], 16
++ add COEF_BLOCK, COEF_BLOCK, #16
++ ld1 {v12.4h, v13.4h}, [COEF_BLOCK], 16
++ add COEF_BLOCK, COEF_BLOCK, #16
++ ld1 {v16.4h, v17.4h}, [COEF_BLOCK], 16
++ /* Dequantize */
++ ld1 {v18.4h, v19.4h, v20.4h, v21.4h}, [DCT_TABLE], 32
++ mul v4.4h, v4.4h, v18.4h
++ mul v5.4h, v5.4h, v19.4h
++ ins v4.2d[1], v5.2d[0]
++ mul v6.4h, v6.4h, v20.4h
++ mul v7.4h, v7.4h, v21.4h
++ ins v6.2d[1], v7.2d[0]
++ add DCT_TABLE, DCT_TABLE, #16
++ ld1 {v24.4h, v25.4h}, [DCT_TABLE], 16
++ mul v10.4h, v10.4h, v24.4h
++ mul v11.4h, v11.4h, v25.4h
++ ins v10.2d[1], v11.2d[0]
++ add DCT_TABLE, DCT_TABLE, #16
++ ld1 {v26.4h, v27.4h}, [DCT_TABLE], 16
++ mul v12.4h, v12.4h, v26.4h
++ mul v13.4h, v13.4h, v27.4h
++ ins v12.2d[1], v13.2d[0]
++ add DCT_TABLE, DCT_TABLE, #16
++ ld1 {v30.4h, v31.4h}, [DCT_TABLE], 16
++ mul v16.4h, v16.4h, v30.4h
++ mul v17.4h, v17.4h, v31.4h
++ ins v16.2d[1], v17.2d[0]
++
++ /* Pass 1 */
++#if 0
++ idct_helper v4.4h, v6.4h, v10.4h, v12.4h, v16.4h, 13, v4.4h, v6.4h
++ transpose_4x4 v4.4h, v6.4h, v8.4h, v10.4h
++ idct_helper v5.4h, v7.4h, v11.4h, v13.4h, v17.4h, 13, v5.4h, v7.4h
++ transpose_4x4 v5.4h, v7.4h, v9.4h, v11.4h
++#else
++ smull v26.4s, v6.4h, v14.4h[3]
++ smlal v26.4s, v10.4h, v14.4h[2]
++ smlal v26.4s, v12.4h, v14.4h[1]
++ smlal v26.4s, v16.4h, v14.4h[0]
++ smull v24.4s, v7.4h, v14.4h[3]
++ smlal v24.4s, v11.4h, v14.4h[2]
++ smlal v24.4s, v13.4h, v14.4h[1]
++ smlal v24.4s, v17.4h, v14.4h[0]
++ sshll v15.4s, v4.4h, #15
++ sshll v30.4s, v5.4h, #15
++ add v20.4s, v15.4s, v26.4s
++ sub v15.4s, v15.4s, v26.4s
++ rshrn v4.4h, v20.4s, #13
++ rshrn v6.4h, v15.4s, #13
++ add v20.4s, v30.4s, v24.4s
++ sub v15.4s, v30.4s, v24.4s
++ rshrn v5.4h, v20.4s, #13
++ rshrn v7.4h, v15.4s, #13
++ ins v4.2d[1], v5.2d[0]
++ ins v6.2d[1], v7.2d[0]
++ transpose v4, v6, v3, .16b, .8h
++ transpose v6, v10, v3, .16b, .4s
++ ins v11.2d[0], v10.2d[1]
++ ins v7.2d[0], v6.2d[1]
++#endif
++
++ /* Pass 2 */
++ idct_helper v4.4h, v6.4h, v10.4h, v7.4h, v11.4h, 20, v26.4h, v27.4h
++
++ /* Range limit */
++ movi v30.8h, #0x80
++ ins v26.2d[1], v27.2d[0]
++ add v26.8h, v26.8h, v30.8h
++ sqxtun v30.8b, v26.8h
++ ins v26.2d[0], v30.2d[0]
++ sqxtun v27.8b, v26.8h
++
++ /* Store results to the output buffer */
++ ldp TMP1, TMP2, [OUTPUT_BUF]
++ add TMP1, TMP1, OUTPUT_COL
++ add TMP2, TMP2, OUTPUT_COL
++
++ st1 {v26.b}[0], [TMP1], 1
++ st1 {v27.b}[4], [TMP1], 1
++ st1 {v26.b}[1], [TMP2], 1
++ st1 {v27.b}[5], [TMP2], 1
++
++ sub sp, sp, #208
++ ldr x15, [sp], 16
++ ld1 {v4.8b - v7.8b}, [sp], 32
++ ld1 {v8.8b - v11.8b}, [sp], 32
++ ld1 {v12.8b - v15.8b}, [sp], 32
++ ld1 {v16.8b - v19.8b}, [sp], 32
++ ld1 {v21.8b - v22.8b}, [sp], 16
++ ld1 {v24.8b - v27.8b}, [sp], 32
++ ld1 {v30.8b - v31.8b}, [sp], 16
++ blr x30
++
++ .unreq DCT_TABLE
++ .unreq COEF_BLOCK
++ .unreq OUTPUT_BUF
++ .unreq OUTPUT_COL
++ .unreq TMP1
++ .unreq TMP2
++
++.purgem idct_helper
++
++
++/*****************************************************************************/
++
++/*
++ * jsimd_ycc_extrgb_convert_neon
++ * jsimd_ycc_extbgr_convert_neon
++ * jsimd_ycc_extrgbx_convert_neon
++ * jsimd_ycc_extbgrx_convert_neon
++ * jsimd_ycc_extxbgr_convert_neon
++ * jsimd_ycc_extxrgb_convert_neon
++ *
++ * Colorspace conversion YCbCr -> RGB
++ */
++
++
++.macro do_load size
++ .if \size == 8
++ ld1 {v4.8b}, [U], 8
++ ld1 {v5.8b}, [V], 8
++ ld1 {v0.8b}, [Y], 8
++ prfm PLDL1KEEP, [U, #64]
++ prfm PLDL1KEEP, [V, #64]
++ prfm PLDL1KEEP, [Y, #64]
++ .elseif \size == 4
++ ld1 {v4.b}[0], [U], 1
++ ld1 {v4.b}[1], [U], 1
++ ld1 {v4.b}[2], [U], 1
++ ld1 {v4.b}[3], [U], 1
++ ld1 {v5.b}[0], [V], 1
++ ld1 {v5.b}[1], [V], 1
++ ld1 {v5.b}[2], [V], 1
++ ld1 {v5.b}[3], [V], 1
++ ld1 {v0.b}[0], [Y], 1
++ ld1 {v0.b}[1], [Y], 1
++ ld1 {v0.b}[2], [Y], 1
++ ld1 {v0.b}[3], [Y], 1
++ .elseif \size == 2
++ ld1 {v4.b}[4], [U], 1
++ ld1 {v4.b}[5], [U], 1
++ ld1 {v5.b}[4], [V], 1
++ ld1 {v5.b}[5], [V], 1
++ ld1 {v0.b}[4], [Y], 1
++ ld1 {v0.b}[5], [Y], 1
++ .elseif \size == 1
++ ld1 {v4.b}[6], [U], 1
++ ld1 {v5.b}[6], [V], 1
++ ld1 {v0.b}[6], [Y], 1
++ .else
++ .error unsupported macroblock size
++ .endif
++.endm
++
++.macro do_store bpp, size
++ .if \bpp == 24
++ .if \size == 8
++ st3 {v10.8b, v11.8b, v12.8b}, [RGB], 24
++ .elseif \size == 4
++ st3 {v10.b, v11.b, v12.b}[0], [RGB], 3
++ st3 {v10.b, v11.b, v12.b}[1], [RGB], 3
++ st3 {v10.b, v11.b, v12.b}[2], [RGB], 3
++ st3 {v10.b, v11.b, v12.b}[3], [RGB], 3
++ .elseif \size == 2
++ st3 {v10.b, v11.b, v12.b}[4], [RGB], 3
++ st3 {v10.b, v11.b, v12.b}[5], [RGB], 3
++ .elseif \size == 1
++ st3 {v10.b, v11.b, v12.b}[6], [RGB], 3
++ .else
++ .error unsupported macroblock size
++ .endif
++ .elseif \bpp == 32
++ .if \size == 8
++ st4 {v10.8b, v11.8b, v12.8b, v13.8b}, [RGB], 32
++ .elseif \size == 4
++ st4 {v10.b, v11.b, v12.b, v13.b}[0], [RGB], 4
++ st4 {v10.b, v11.b, v12.b, v13.b}[1], [RGB], 4
++ st4 {v10.b, v11.b, v12.b, v13.b}[2], [RGB], 4
++ st4 {v10.b, v11.b, v12.b, v13.b}[3], [RGB], 4
++ .elseif \size == 2
++ st4 {v10.b, v11.b, v12.b, v13.b}[4], [RGB], 4
++ st4 {v10.b, v11.b, v12.b, v13.b}[5], [RGB], 4
++ .elseif \size == 1
++ st4 {v10.b, v11.b, v12.b, v13.b}[6], [RGB], 4
++ .else
++ .error unsupported macroblock size
++ .endif
++ .elseif \bpp==16
++ .if \size == 8
++ st1 {v25.8h}, [RGB],16
++ .elseif \size == 4
++ st1 {v25.4h}, [RGB],8
++ .elseif \size == 2
++ st1 {v25.h}[4], [RGB],2
++ st1 {v25.h}[5], [RGB],2
++ .elseif \size == 1
++ st1 {v25.h}[6], [RGB],2
++ .else
++ .error unsupported macroblock size
++ .endif
++ .else
++ .error unsupported bpp
++ .endif
++.endm
++
++.macro generate_jsimd_ycc_rgb_convert_neon colorid, bpp, r_offs, rsize, g_offs, gsize, b_offs, bsize, defsize
++
++/*
++ * 2-stage pipelined YCbCr->RGB conversion
++ */
++
++.macro do_yuv_to_rgb_stage1
++ uaddw v6.8h, v2.8h, v4.8b /* q3 = u - 128 */
++ uaddw v8.8h, v2.8h, v5.8b /* q2 = v - 128 */
++ smull v20.4s, v6.4h, v1.4h[1] /* multiply by -11277 */
++ smlal v20.4s, v8.4h, v1.4h[2] /* multiply by -23401 */
++ smull2 v22.4s, v6.8h, v1.4h[1] /* multiply by -11277 */
++ smlal2 v22.4s, v8.8h, v1.4h[2] /* multiply by -23401 */
++ smull v24.4s, v8.4h, v1.4h[0] /* multiply by 22971 */
++ smull2 v26.4s, v8.8h, v1.4h[0] /* multiply by 22971 */
++ smull v28.4s, v6.4h, v1.4h[3] /* multiply by 29033 */
++ smull2 v30.4s, v6.8h, v1.4h[3] /* multiply by 29033 */
++.endm
++
++.macro do_yuv_to_rgb_stage2
++ rshrn v20.4h, v20.4s, #15
++ rshrn2 v20.8h, v22.4s, #15
++ rshrn v24.4h, v24.4s, #14
++ rshrn2 v24.8h, v26.4s, #14
++ rshrn v28.4h, v28.4s, #14
++ rshrn2 v28.8h, v30.4s, #14
++ uaddw v20.8h, v20.8h, v0.8b
++ uaddw v24.8h, v24.8h, v0.8b
++ uaddw v28.8h, v28.8h, v0.8b
++.if \bpp != 16
++ sqxtun v1\g_offs\defsize, v20.8h
++ sqxtun v1\r_offs\defsize, v24.8h
++ sqxtun v1\b_offs\defsize, v28.8h
++.else
++ sqshlu v21.8h, v20.8h, #8
++ sqshlu v25.8h, v24.8h, #8
++ sqshlu v29.8h, v28.8h, #8
++ sri v25.8h, v21.8h, #5
++ sri v25.8h, v29.8h, #11
++.endif
++
++.endm
++
++.macro do_yuv_to_rgb_stage2_store_load_stage1
++ rshrn v20.4h, v20.4s, #15
++ rshrn v24.4h, v24.4s, #14
++ rshrn v28.4h, v28.4s, #14
++ ld1 {v4.8b}, [U], 8
++ rshrn2 v20.8h, v22.4s, #15
++ rshrn2 v24.8h, v26.4s, #14
++ rshrn2 v28.8h, v30.4s, #14
++ ld1 {v5.8b}, [V], 8
++ uaddw v20.8h, v20.8h, v0.8b
++ uaddw v24.8h, v24.8h, v0.8b
++ uaddw v28.8h, v28.8h, v0.8b
++.if \bpp != 16 /**************** rgb24/rgb32 *********************************/
++ sqxtun v1\g_offs\defsize, v20.8h
++ ld1 {v0.8b}, [Y], 8
++ sqxtun v1\r_offs\defsize, v24.8h
++ prfm PLDL1KEEP, [U, #64]
++ prfm PLDL1KEEP, [V, #64]
++ prfm PLDL1KEEP, [Y, #64]
++ sqxtun v1\b_offs\defsize, v28.8h
++ uaddw v6.8h, v2.8h, v4.8b /* v6.16b = u - 128 */
++ uaddw v8.8h, v2.8h, v5.8b /* q2 = v - 128 */
++ smull v20.4s, v6.4h, v1.4h[1] /* multiply by -11277 */
++ smlal v20.4s, v8.4h, v1.4h[2] /* multiply by -23401 */
++ smull2 v22.4s, v6.8h, v1.4h[1] /* multiply by -11277 */
++ smlal2 v22.4s, v8.8h, v1.4h[2] /* multiply by -23401 */
++ smull v24.4s, v8.4h, v1.4h[0] /* multiply by 22971 */
++ smull2 v26.4s, v8.8h, v1.4h[0] /* multiply by 22971 */
++.else /**************************** rgb565 ***********************************/
++ sqshlu v21.8h, v20.8h, #8
++ sqshlu v25.8h, v24.8h, #8
++ sqshlu v29.8h, v28.8h, #8
++ uaddw v6.8h, v2.8h, v4.8b /* v6.16b = u - 128 */
++ uaddw v8.8h, v2.8h, v5.8b /* q2 = v - 128 */
++ ld1 {v0.8b}, [Y], 8
++ smull v20.4s, v6.4h, v1.4h[1] /* multiply by -11277 */
++ smlal v20.4s, v8.4h, v1.4h[2] /* multiply by -23401 */
++ smull2 v22.4s, v6.8h, v1.4h[1] /* multiply by -11277 */
++ smlal2 v22.4s, v8.8h, v1.4h[2] /* multiply by -23401 */
++ sri v25.8h, v21.8h, #5
++ smull v24.4s, v8.4h, v1.4h[0] /* multiply by 22971 */
++ smull2 v26.4s, v8.8h, v1.4h[0] /* multiply by 22971 */
++ prfm PLDL1KEEP, [U, #64]
++ prfm PLDL1KEEP, [V, #64]
++ prfm PLDL1KEEP, [Y, #64]
++ sri v25.8h, v29.8h, #11
++.endif
++ do_store \bpp, 8
++ smull v28.4s, v6.4h, v1.4h[3] /* multiply by 29033 */
++ smull2 v30.4s, v6.8h, v1.4h[3] /* multiply by 29033 */
++.endm
++
++.macro do_yuv_to_rgb
++ do_yuv_to_rgb_stage1
++ do_yuv_to_rgb_stage2
++.endm
++
++/* Apple gas crashes on adrl, work around that by using adr.
++ * But this requires a copy of these constants for each function.
++ */
++
++.balign 16
++jsimd_ycc_\colorid\()_neon_consts:
++ .short 0, 0, 0, 0
++ .short 22971, -11277, -23401, 29033
++ .short -128, -128, -128, -128
++ .short -128, -128, -128, -128
++
++asm_function jsimd_ycc_\colorid\()_convert_neon
++ OUTPUT_WIDTH .req x0
++ INPUT_BUF .req x1
++ INPUT_ROW .req x2
++ OUTPUT_BUF .req x3
++ NUM_ROWS .req x4
++
++ INPUT_BUF0 .req x5
++ INPUT_BUF1 .req x6
++ INPUT_BUF2 .req INPUT_BUF
++
++ RGB .req x7
++ Y .req x8
++ U .req x9
++ V .req x10
++ N .req x15
++
++ sub sp, sp, 336
++ str x15, [sp], 16
++ /* Load constants to d1, d2, d3 (v0.4h is just used for padding) */
++ adr x15, jsimd_ycc_\colorid\()_neon_consts
++ /* Save NEON registers */
++ st1 {v0.8b - v3.8b}, [sp], 32
++ st1 {v4.8b - v7.8b}, [sp], 32
++ st1 {v8.8b - v11.8b}, [sp], 32
++ st1 {v12.8b - v15.8b}, [sp], 32
++ st1 {v16.8b - v19.8b}, [sp], 32
++ st1 {v20.8b - v23.8b}, [sp], 32
++ st1 {v24.8b - v27.8b}, [sp], 32
++ st1 {v28.8b - v31.8b}, [sp], 32
++ ld1 {v0.4h, v1.4h}, [x15], 16
++ ld1 {v2.8h}, [x15]
++
++ /* Save ARM registers and handle input arguments */
++ /* push {x4, x5, x6, x7, x8, x9, x10, x30} */
++ stp x4, x5, [sp], 16
++ stp x6, x7, [sp], 16
++ stp x8, x9, [sp], 16
++ stp x10, x30, [sp], 16
++ ldr INPUT_BUF0, [INPUT_BUF]
++ ldr INPUT_BUF1, [INPUT_BUF, 8]
++ ldr INPUT_BUF2, [INPUT_BUF, 16]
++ .unreq INPUT_BUF
++
++ /* Initially set v10, v11.4h, v12.8b, d13 to 0xFF */
++ movi v10.16b, #255
++ movi v13.16b, #255
++
++ /* Outer loop over scanlines */
++ cmp NUM_ROWS, #1
++ blt 9f
++0:
++ lsl x16, INPUT_ROW, #3
++ ldr Y, [INPUT_BUF0, x16]
++ ldr U, [INPUT_BUF1, x16]
++ mov N, OUTPUT_WIDTH
++ ldr V, [INPUT_BUF2, x16]
++ add INPUT_ROW, INPUT_ROW, #1
++ ldr RGB, [OUTPUT_BUF], #8
++
++ /* Inner loop over pixels */
++ subs N, N, #8
++ blt 3f
++ do_load 8
++ do_yuv_to_rgb_stage1
++ subs N, N, #8
++ blt 2f
++1:
++ do_yuv_to_rgb_stage2_store_load_stage1
++ subs N, N, #8
++ bge 1b
++2:
++ do_yuv_to_rgb_stage2
++ do_store \bpp, 8
++ tst N, #7
++ beq 8f
++3:
++ tst N, #4
++ beq 3f
++ do_load 4
++3:
++ tst N, #2
++ beq 4f
++ do_load 2
++4:
++ tst N, #1
++ beq 5f
++ do_load 1
++5:
++ do_yuv_to_rgb
++ tst N, #4
++ beq 6f
++ do_store \bpp, 4
++6:
++ tst N, #2
++ beq 7f
++ do_store \bpp, 2
++7:
++ tst N, #1
++ beq 8f
++ do_store \bpp, 1
++8:
++ subs NUM_ROWS, NUM_ROWS, #1
++ bgt 0b
++9:
++ /* Restore all registers and return */
++ sub sp, sp, #336
++ ldr x15, [sp], 16
++ ld1 {v0.8b - v3.8b}, [sp], 32
++ ld1 {v4.8b - v7.8b}, [sp], 32
++ ld1 {v8.8b - v11.8b}, [sp], 32
++ ld1 {v12.8b - v15.8b}, [sp], 32
++ ld1 {v16.8b - v19.8b}, [sp], 32
++ ld1 {v20.8b - v23.8b}, [sp], 32
++ ld1 {v24.8b - v27.8b}, [sp], 32
++ ld1 {v28.8b - v31.8b}, [sp], 32
++ /* pop {r4, r5, r6, r7, r8, r9, r10, pc} */
++ ldp x4, x5, [sp], 16
++ ldp x6, x7, [sp], 16
++ ldp x8, x9, [sp], 16
++ ldp x10, x30, [sp], 16
++ br x30
++ .unreq OUTPUT_WIDTH
++ .unreq INPUT_ROW
++ .unreq OUTPUT_BUF
++ .unreq NUM_ROWS
++ .unreq INPUT_BUF0
++ .unreq INPUT_BUF1
++ .unreq INPUT_BUF2
++ .unreq RGB
++ .unreq Y
++ .unreq U
++ .unreq V
++ .unreq N
++
++.purgem do_yuv_to_rgb
++.purgem do_yuv_to_rgb_stage1
++.purgem do_yuv_to_rgb_stage2
++.purgem do_yuv_to_rgb_stage2_store_load_stage1
++.endm
++
++/*--------------------------------- id ----- bpp R rsize G gsize B bsize defsize */
++generate_jsimd_ycc_rgb_convert_neon extrgb, 24, 0, .4h, 1, .4h, 2, .4h, .8b
++generate_jsimd_ycc_rgb_convert_neon extbgr, 24, 2, .4h, 1, .4h, 0, .4h, .8b
++generate_jsimd_ycc_rgb_convert_neon extrgbx, 32, 0, .4h, 1, .4h, 2, .4h, .8b
++generate_jsimd_ycc_rgb_convert_neon extbgrx, 32, 2, .4h, 1, .4h, 0, .4h, .8b
++generate_jsimd_ycc_rgb_convert_neon extxbgr, 32, 3, .4h, 2, .4h, 1, .4h, .8b
++generate_jsimd_ycc_rgb_convert_neon extxrgb, 32, 1, .4h, 2, .4h, 3, .4h, .8b
++generate_jsimd_ycc_rgb_convert_neon rgb565, 16, 0, .4h, 0, .4h, 0, .4h, .8b
++.purgem do_load
++.purgem do_store
projects / platform / framework / web / crosswalk.git / blobdiff