--- /dev/null
+/***************************************************************************
+Copyright (c) 2017, The OpenBLAS Project
+All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+1. Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in
+the documentation and/or other materials provided with the
+distribution.
+3. Neither the name of the OpenBLAS project nor the names of
+its contributors may be used to endorse or promote products
+derived from this software without specific prior written permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBLAS PROJECT OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*****************************************************************************/
+
+#include "common.h"
+
+#define N "x0" /* vector length */
+#define X "x1" /* "X" vector address */
+#define INC_X "x2" /* "X" stride */
+#define INDEX "x3" /* index of max/min value */
+#define Z "x4" /* vector index */
+#define J "x5" /* loop variable */
+
+#if !defined(DOUBLE)
+#define MAXF "s0"
+#define TMPF0 "s1"
+#define TMPF1 "s4"
+#define N_KERNEL_SIZE "64"
+#define SZ "4"
+#define N_DIV_SHIFT "6"
+#define N_REM_MASK "63"
+#define INC_SHIFT "2"
+#else
+#define MAXF "d0"
+#define TMPF0 "d1"
+#define TMPF1 "d4"
+#define N_KERNEL_SIZE "32"
+#define SZ "8"
+#define N_DIV_SHIFT "5"
+#define N_REM_MASK "31"
+#define INC_SHIFT "3"
+#endif
+
+/******************************************************************************/
+
+#if !defined(DOUBLE)
+#define KERNEL_F \
+ "ldp q2, q3, ["X"] \n" \
+ "ldp q4, q5, ["X", #32] \n" \
+ "ldp q6, q7, ["X", #64] \n" \
+ "ldp q16, q17, ["X", #96] \n" \
+ "ldp q18, q19, ["X", #128] \n" \
+ "ldp q20, q21, ["X", #160] \n" \
+ "ldp q22, q23, ["X", #192] \n" \
+ "ldp q24, q25, ["X", #224] \n" \
+ "add "X", "X", #256 \n" \
+ "fabs v2.4s, v2.4s \n" \
+ "fabs v3.4s, v3.4s \n" \
+ "fabs v4.4s, v4.4s \n" \
+ "fabs v5.4s, v5.4s \n" \
+ "fabs v6.4s, v6.4s \n" \
+ "fabs v7.4s, v7.4s \n" \
+ "fabs v16.4s, v16.4s \n" \
+ "fabs v17.4s, v17.4s \n" \
+ "fabs v18.4s, v18.4s \n" \
+ "fabs v19.4s, v19.4s \n" \
+ "fabs v20.4s, v20.4s \n" \
+ "fabs v21.4s, v21.4s \n" \
+ "fabs v22.4s, v22.4s \n" \
+ "fabs v23.4s, v23.4s \n" \
+ "fabs v24.4s, v24.4s \n" \
+ "fabs v25.4s, v25.4s \n" \
+ "fmax v2.4s, v2.4s, v3.4s \n" \
+ "fmax v4.4s, v4.4s, v5.4s \n" \
+ "fmax v6.4s, v6.4s, v7.4s \n" \
+ "fmax v16.4s, v16.4s, v17.4s \n" \
+ "fmax v18.4s, v18.4s, v19.4s \n" \
+ "fmax v20.4s, v20.4s, v21.4s \n" \
+ "fmax v22.4s, v22.4s, v23.4s \n" \
+ "fmax v24.4s, v24.4s, v25.4s \n" \
+ "PRFM PLDL1KEEP, ["X", #1024] \n" \
+ "PRFM PLDL1KEEP, ["X", #1024+64] \n" \
+ "PRFM PLDL1KEEP, ["X", #1024+128] \n" \
+ "PRFM PLDL1KEEP, ["X", #1024+192] \n" \
+ "fmax v2.4s, v2.4s, v4.4s \n" \
+ "fmax v6.4s, v6.4s, v16.4s \n" \
+ "fmax v18.4s, v18.4s, v20.4s \n" \
+ "fmax v22.4s, v22.4s, v24.4s \n" \
+ "fmax v2.4s, v2.4s, v6.4s \n" \
+ "fmax v18.4s, v18.4s, v22.4s \n" \
+ "fmax v2.4s, v2.4s, v18.4s \n" \
+ "fmaxv "TMPF0", v2.4s \n" \
+ "fcmp "MAXF", "TMPF0" \n" \
+ "fcsel "MAXF", "MAXF", "TMPF0", ge \n" \
+ "csel "INDEX", "INDEX", "Z", ge \n" \
+ "add "Z", "Z", #"N_KERNEL_SIZE" \n"
+
+#else
+
+#define KERNEL_F \
+ "ldp q2, q3, ["X"] \n" \
+ "ldp q4, q5, ["X", #32] \n" \
+ "ldp q6, q7, ["X", #64] \n" \
+ "ldp q16, q17, ["X", #96] \n" \
+ "ldp q18, q19, ["X", #128] \n" \
+ "ldp q20, q21, ["X", #160] \n" \
+ "ldp q22, q23, ["X", #192] \n" \
+ "ldp q24, q25, ["X", #224] \n" \
+ "add "X", "X", #256 \n" \
+ "fabs v2.2d, v2.2d \n" \
+ "fabs v3.2d, v3.2d \n" \
+ "fabs v4.2d, v4.2d \n" \
+ "fabs v5.2d, v5.2d \n" \
+ "fabs v6.2d, v6.2d \n" \
+ "fabs v7.2d, v7.2d \n" \
+ "fabs v16.2d, v16.2d \n" \
+ "fabs v17.2d, v17.2d \n" \
+ "fabs v18.2d, v18.2d \n" \
+ "fabs v19.2d, v19.2d \n" \
+ "fabs v20.2d, v20.2d \n" \
+ "fabs v21.2d, v21.2d \n" \
+ "fabs v22.2d, v22.2d \n" \
+ "fabs v23.2d, v23.2d \n" \
+ "fabs v24.2d, v24.2d \n" \
+ "fabs v25.2d, v25.2d \n" \
+ "fmax v2.2d, v2.2d, v3.2d \n" \
+ "fmax v4.2d, v4.2d, v5.2d \n" \
+ "fmax v6.2d, v6.2d, v7.2d \n" \
+ "fmax v16.2d, v16.2d, v17.2d \n" \
+ "fmax v18.2d, v18.2d, v19.2d \n" \
+ "fmax v20.2d, v20.2d, v21.2d \n" \
+ "fmax v22.2d, v22.2d, v23.2d \n" \
+ "fmax v24.2d, v24.2d, v25.2d \n" \
+ "PRFM PLDL1KEEP, ["X", #1024] \n" \
+ "PRFM PLDL1KEEP, ["X", #1024+64] \n" \
+ "PRFM PLDL1KEEP, ["X", #1024+128] \n" \
+ "PRFM PLDL1KEEP, ["X", #1024+192] \n" \
+ "fmax v2.2d, v2.2d, v4.2d \n" \
+ "fmax v6.2d, v6.2d, v16.2d \n" \
+ "fmax v18.2d, v18.2d, v20.2d \n" \
+ "fmax v22.2d, v22.2d, v24.2d \n" \
+ "fmax v2.2d, v2.2d, v6.2d \n" \
+ "fmax v18.2d, v18.2d, v22.2d \n" \
+ "fmax v2.2d, v2.2d, v18.2d \n" \
+ "ins v3.d[0], v2.d[1] \n" \
+ "fmax "TMPF0", d3, d2 \n" \
+ "fcmp "MAXF", "TMPF0" \n" \
+ "fcsel "MAXF", "MAXF", "TMPF0", ge \n" \
+ "csel "INDEX", "INDEX", "Z", ge \n" \
+ "add "Z", "Z", #"N_KERNEL_SIZE" \n"
+#endif
+
+#define KERNEL_F_FINALIZE \
+ "sub x6, "INDEX", #1 \n" \
+ "lsl x6, x6, #"INC_SHIFT" \n" \
+ "add x7, x7, x6 \n" \
+ "mov x6, #0 \n" \
+ "1: \n" \
+ "add x6, x6, #1 \n" \
+ "cmp x6, #"N_KERNEL_SIZE" \n" \
+ "bge 2f \n" \
+ "ldr "TMPF1", [x7] \n" \
+ "fabs "TMPF1", "TMPF1" \n" \
+ "fcmp "MAXF", "TMPF1" \n" \
+ "add x7, x7, #"SZ" \n" \
+ "bne 1b \n" \
+ "2: \n" \
+ "sub x6, x6, #1 \n" \
+ "add "INDEX", "INDEX", x6 \n"
+
+
+#define INIT \
+ "lsl "INC_X", "INC_X", #"INC_SHIFT" \n" \
+ "ldr "MAXF", ["X"] \n" \
+ "add "X", "X", "INC_X" \n" \
+ "mov "Z", #1 \n" \
+ "mov "INDEX", "Z" \n" \
+ "fabs "MAXF", "MAXF" \n"
+
+
+#define KERNEL_S1 \
+ "ldr "TMPF0", ["X"] \n" \
+ "add "X", "X", "INC_X" \n" \
+ "add "Z", "Z", #1 \n" \
+ "fabs "TMPF0", "TMPF0" \n" \
+ "fcmp "MAXF", "TMPF0" \n" \
+ "fcsel "MAXF", "MAXF", "TMPF0", ge \n" \
+ "csel "INDEX", "INDEX", "Z", ge \n"
+
+
+#if defined(SMP)
+extern int blas_level1_thread_with_return_value(int mode, BLASLONG m, BLASLONG n,
+ BLASLONG k, void *alpha, void *a, BLASLONG lda, void *b, BLASLONG ldb,
+ void *c, BLASLONG ldc, int (*function)(), int nthreads);
+#endif
+
+
+static BLASLONG iamax_compute(BLASLONG n, FLOAT *x, BLASLONG inc_x)
+{
+ BLASLONG index = 0;
+
+ if ( n < 0 ) return index;
+
+ __asm__ __volatile__ (
+ " mov "N", %[N_] \n"
+ " mov "X", %[X_] \n"
+ " mov "INC_X", %[INCX_] \n"
+
+ " cmp "N", xzr \n"
+ " ble .Liamax_kernel_zero \n"
+ " cmp "INC_X", xzr \n"
+ " ble .Liamax_kernel_zero \n"
+ " cmp "INC_X", #1 \n"
+ " bne .Liamax_kernel_S_BEGIN \n"
+ " mov x7, "X" \n"
+
+ ".Liamax_kernel_F_BEGIN: \n"
+ " "INIT" \n"
+ " subs "N", "N", #1 \n"
+ " ble .Liamax_kernel_L999 \n"
+ " asr "J", "N", #"N_DIV_SHIFT" \n"
+ " cmp "J", xzr \n"
+ " beq .Liamax_kernel_F1 \n"
+ " add "Z", "Z", #1 \n"
+
+ ".Liamax_kernel_F: \n"
+ " "KERNEL_F" \n"
+ " subs "J", "J", #1 \n"
+ " bne .Liamax_kernel_F \n"
+ " "KERNEL_F_FINALIZE" \n"
+ " sub "Z", "Z", #1 \n"
+
+ ".Liamax_kernel_F1: \n"
+ " ands "J", "N", #"N_REM_MASK" \n"
+ " ble .Liamax_kernel_L999 \n"
+
+ ".Liamax_kernel_F10: \n"
+ " "KERNEL_S1" \n"
+ " subs "J", "J", #1 \n"
+ " bne .Liamax_kernel_F10 \n"
+ " b .Liamax_kernel_L999 \n"
+
+ ".Liamax_kernel_S_BEGIN: \n"
+ " "INIT" \n"
+ " subs "N", "N", #1 \n"
+ " ble .Liamax_kernel_L999 \n"
+ " asr "J", "N", #2 \n"
+ " cmp "J", xzr \n"
+ " ble .Liamax_kernel_S1 \n"
+
+ ".Liamax_kernel_S4: \n"
+ " "KERNEL_S1" \n"
+ " "KERNEL_S1" \n"
+ " "KERNEL_S1" \n"
+ " "KERNEL_S1" \n"
+ " subs "J", "J", #1 \n"
+ " bne .Liamax_kernel_S4 \n"
+
+ ".Liamax_kernel_S1: \n"
+ " ands "J", "N", #3 \n"
+ " ble .Liamax_kernel_L999 \n"
+
+ ".Liamax_kernel_S10: \n"
+ " "KERNEL_S1" \n"
+ " subs "J", "J", #1 \n"
+ " bne .Liamax_kernel_S10 \n"
+
+ ".Liamax_kernel_L999: \n"
+ " mov x0, "INDEX" \n"
+ " b .Liamax_kernel_DONE \n"
+
+ ".Liamax_kernel_zero: \n"
+ " mov x0, xzr \n"
+
+ ".Liamax_kernel_DONE: \n"
+ " mov %[INDEX_], "INDEX" \n"
+
+ : [INDEX_] "=r" (index) //%0
+ : [N_] "r" (n), //%1
+ [X_] "r" (x), //%2
+ [INCX_] "r" (inc_x) //%3
+ : "cc",
+ "memory",
+ "x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7",
+ "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7"
+ );
+
+ return index;
+}
+
+#if defined(SMP)
+static int iamax_thread_function(BLASLONG n, BLASLONG dummy0,
+ BLASLONG dummy1, FLOAT dummy2, FLOAT *x, BLASLONG inc_x, FLOAT *y,
+ BLASLONG inc_y, FLOAT *result, BLASLONG dummy3)
+{
+ *(BLASLONG *)result = iamax_compute(n, x, inc_x);
+
+ return 0;
+}
+#endif
+
+BLASLONG CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x)
+{
+#if defined(SMP)
+ int nthreads;
+ FLOAT dummy_alpha;
+#endif
+ BLASLONG max_index = 0;
+
+#if defined(SMP)
+ nthreads = num_cpu_avail(1);
+
+ if (inc_x == 0)
+ nthreads = 1;
+
+ if (n <= 1000)
+ nthreads = 1;
+
+ if (nthreads == 1) {
+ max_index = iamax_compute(n, x, inc_x);
+ } else {
+ BLASLONG i, width, cur_index;
+ int num_cpu;
+ int mode;
+ char result[MAX_CPU_NUMBER * sizeof(double) * 2];
+ FLOAT max = -1.0;
+
+#if !defined(DOUBLE)
+ mode = BLAS_SINGLE;
+#else
+ mode = BLAS_DOUBLE;
+#endif
+
+ blas_level1_thread_with_return_value(mode, n, 0, 0, &dummy_alpha,
+ x, inc_x, NULL, 0, result, 0,
+ ( void *)iamax_thread_function, nthreads);
+
+ num_cpu = 0;
+ i = n;
+ cur_index = 0;
+
+ while (i > 0) {
+ FLOAT elem;
+ BLASLONG cur_max_index;
+
+ cur_max_index = *(BLASLONG *)&result[num_cpu * sizeof(double) * 2];
+ elem = x[((cur_index + cur_max_index - 1) * inc_x)];
+ elem = fabs(elem);
+
+ if (elem >= max) {
+ max = elem;
+ max_index = cur_index + cur_max_index;
+ }
+
+ width = blas_quickdivide(i + nthreads - num_cpu - 1,
+ nthreads - num_cpu);
+ i -= width;
+ cur_index += width;
+ num_cpu ++;
+ }
+ }
+#else
+ max_index = iamax_compute(n, x, inc_x);
+#endif
+
+ return max_index;
+}
projects / platform / upstream / openblas.git / commitdiff