; ; Copyright (c) 2010 The WebM project authors. All Rights Reserved. ; ; Use of this source code is governed by a BSD-style license ; that can be found in the LICENSE file in the root of the source ; tree. An additional intellectual property rights grant can be found ; in the file PATENTS. All contributing project authors may ; be found in the AUTHORS file in the root of the source tree. ; EXPORT |vp8_sub_pixel_variance8x8_neon| ARM REQUIRE8 PRESERVE8 AREA ||.text||, CODE, READONLY, ALIGN=2 ; r0 unsigned char *src_ptr, ; r1 int src_pixels_per_line, ; r2 int xoffset, ; r3 int yoffset, ; stack(r4) unsigned char *dst_ptr, ; stack(r5) int dst_pixels_per_line, ; stack(r6) unsigned int *sse ;note: most of the code is copied from bilinear_predict8x8_neon and vp8_variance8x8_neon. |vp8_sub_pixel_variance8x8_neon| PROC push {r4-r5, lr} adr r12, bilinear_taps_coeff ldr r4, [sp, #12] ;load *dst_ptr from stack ldr r5, [sp, #16] ;load dst_pixels_per_line from stack ldr lr, [sp, #20] ;load *sse from stack cmp r2, #0 ;skip first_pass filter if xoffset=0 beq skip_firstpass_filter ;First pass: output_height lines x output_width columns (9x8) add r2, r12, r2, lsl #3 ;calculate filter location vld1.u8 {q1}, [r0], r1 ;load src data vld1.u32 {d31}, [r2] ;load first_pass filter vld1.u8 {q2}, [r0], r1 vdup.8 d0, d31[0] ;first_pass filter (d0 d1) vld1.u8 {q3}, [r0], r1 vdup.8 d1, d31[4] vld1.u8 {q4}, [r0], r1 vmull.u8 q6, d2, d0 ;(src_ptr[0] * Filter[0]) vmull.u8 q7, d4, d0 vmull.u8 q8, d6, d0 vmull.u8 q9, d8, d0 vext.8 d3, d2, d3, #1 ;construct src_ptr[-1] vext.8 d5, d4, d5, #1 vext.8 d7, d6, d7, #1 vext.8 d9, d8, d9, #1 vmlal.u8 q6, d3, d1 ;(src_ptr[1] * Filter[1]) vmlal.u8 q7, d5, d1 vmlal.u8 q8, d7, d1 vmlal.u8 q9, d9, d1 vld1.u8 {q1}, [r0], r1 ;load src data vqrshrn.u16 d22, q6, #7 ;shift/round/saturate to u8 vld1.u8 {q2}, [r0], r1 vqrshrn.u16 d23, q7, #7 vld1.u8 {q3}, [r0], r1 vqrshrn.u16 d24, q8, #7 vld1.u8 {q4}, [r0], r1 vqrshrn.u16 d25, q9, #7 ;first_pass filtering on the rest 5-line data vld1.u8 {q5}, [r0], r1 vmull.u8 q6, d2, d0 ;(src_ptr[0] * Filter[0]) vmull.u8 q7, d4, d0 vmull.u8 q8, d6, d0 vmull.u8 q9, d8, d0 vmull.u8 q10, d10, d0 vext.8 d3, d2, d3, #1 ;construct src_ptr[-1] vext.8 d5, d4, d5, #1 vext.8 d7, d6, d7, #1 vext.8 d9, d8, d9, #1 vext.8 d11, d10, d11, #1 vmlal.u8 q6, d3, d1 ;(src_ptr[1] * Filter[1]) vmlal.u8 q7, d5, d1 vmlal.u8 q8, d7, d1 vmlal.u8 q9, d9, d1 vmlal.u8 q10, d11, d1 vqrshrn.u16 d26, q6, #7 ;shift/round/saturate to u8 vqrshrn.u16 d27, q7, #7 vqrshrn.u16 d28, q8, #7 vqrshrn.u16 d29, q9, #7 vqrshrn.u16 d30, q10, #7 ;Second pass: 8x8 secondpass_filter cmp r3, #0 ;skip second_pass filter if yoffset=0 ;skip_secondpass_filter beq sub_pixel_variance8x8_neon add r3, r12, r3, lsl #3 vld1.u32 {d31}, [r3] ;load second_pass filter vdup.8 d0, d31[0] ;second_pass filter parameters (d0 d1) vdup.8 d1, d31[4] vmull.u8 q1, d22, d0 ;(src_ptr[0] * Filter[0]) vmull.u8 q2, d23, d0 vmull.u8 q3, d24, d0 vmull.u8 q4, d25, d0 vmull.u8 q5, d26, d0 vmull.u8 q6, d27, d0 vmull.u8 q7, d28, d0 vmull.u8 q8, d29, d0 vmlal.u8 q1, d23, d1 ;(src_ptr[pixel_step] * Filter[1]) vmlal.u8 q2, d24, d1 vmlal.u8 q3, d25, d1 vmlal.u8 q4, d26, d1 vmlal.u8 q5, d27, d1 vmlal.u8 q6, d28, d1 vmlal.u8 q7, d29, d1 vmlal.u8 q8, d30, d1 vqrshrn.u16 d22, q1, #7 ;shift/round/saturate to u8 vqrshrn.u16 d23, q2, #7 vqrshrn.u16 d24, q3, #7 vqrshrn.u16 d25, q4, #7 vqrshrn.u16 d26, q5, #7 vqrshrn.u16 d27, q6, #7 vqrshrn.u16 d28, q7, #7 vqrshrn.u16 d29, q8, #7 b sub_pixel_variance8x8_neon ;-------------------- skip_firstpass_filter vld1.u8 {d22}, [r0], r1 ;load src data vld1.u8 {d23}, [r0], r1 vld1.u8 {d24}, [r0], r1 vld1.u8 {d25}, [r0], r1 vld1.u8 {d26}, [r0], r1 vld1.u8 {d27}, [r0], r1 vld1.u8 {d28}, [r0], r1 vld1.u8 {d29}, [r0], r1 vld1.u8 {d30}, [r0], r1 b secondpass_filter ;---------------------- ;vp8_variance8x8_neon sub_pixel_variance8x8_neon vmov.i8 q8, #0 ;q8 - sum vmov.i8 q9, #0 ;q9, q10 - sse vmov.i8 q10, #0 mov r12, #2 sub_pixel_variance8x8_neon_loop vld1.8 {d0}, [r4], r5 ;load dst data subs r12, r12, #1 vld1.8 {d1}, [r4], r5 vld1.8 {d2}, [r4], r5 vsubl.u8 q4, d22, d0 ;calculate diff vld1.8 {d3}, [r4], r5 vsubl.u8 q5, d23, d1 vsubl.u8 q6, d24, d2 vpadal.s16 q8, q4 ;sum vmlal.s16 q9, d8, d8 ;sse vmlal.s16 q10, d9, d9 vsubl.u8 q7, d25, d3 vpadal.s16 q8, q5 vmlal.s16 q9, d10, d10 vmlal.s16 q10, d11, d11 vmov q11, q13 vpadal.s16 q8, q6 vmlal.s16 q9, d12, d12 vmlal.s16 q10, d13, d13 vmov q12, q14 vpadal.s16 q8, q7 vmlal.s16 q9, d14, d14 vmlal.s16 q10, d15, d15 bne sub_pixel_variance8x8_neon_loop vadd.u32 q10, q9, q10 ;accumulate sse vpaddl.s32 q0, q8 ;accumulate sum vpaddl.u32 q1, q10 vadd.s64 d0, d0, d1 vadd.u64 d1, d2, d3 vmull.s32 q5, d0, d0 vst1.32 {d1[0]}, [lr] ;store sse vshr.u32 d10, d10, #6 vsub.u32 d0, d1, d10 vmov.32 r0, d0[0] ;return pop {r4-r5, pc} ENDP ;----------------- bilinear_taps_coeff DCD 128, 0, 112, 16, 96, 32, 80, 48, 64, 64, 48, 80, 32, 96, 16, 112 END