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OpenBLAS/kernel/power/idamax.c

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/***************************************************************************
Copyright (c) 2013-2018, 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"
#include <math.h>
#if defined(__VEC__) || defined(__ALTIVEC__)
#include <altivec.h>
#endif
#if defined(DOUBLE)
#define ABS fabs
#else
#define ABS fabsf
#endif
#if defined(__VEC__) || defined(__ALTIVEC__)
/**
* Find maximum index
* Warning: requirements n>0 and n % 32 == 0
* @param n
* @param x pointer to the vector
* @param maxf (out) maximum absolute value .( only for output )
* @return index
*/
static BLASLONG diamax_kernel_32(BLASLONG n, FLOAT *x, FLOAT *maxf) {
BLASLONG index;
register __vector long long start = {1,0};
register __vector long long temp_add_index = {2, 2};
__asm__(
"lxvd2x 44, 0,%[ptr_tmp] \n\t"
"lxvd2x 45, %[i16],%[ptr_tmp] \n\t"
"lxvd2x 46, %[i32],%[ptr_tmp] \n\t"
"lxvd2x 47, %[i48],%[ptr_tmp] \n\t"
"lxvd2x 48, %[i64],%[ptr_tmp] \n\t"
"lxvd2x 49, %[i80],%[ptr_tmp] \n\t"
"lxvd2x 6, %[i96],%[ptr_tmp] \n\t"
"lxvd2x 7,%[i112],%[ptr_tmp] \n\t"
"xxlor 40,%x[start],%x[start] \n\t" //{ 1,0} vs40 | v8
"vaddudm 9,8,%[adder] \n\t" //{3,2} vs41
"xxlxor 37,37 ,37 \n\t" //v5 v37 index_count
"vaddudm 10,9,%[adder] \n\t" //{5,4} vs42
"xxlxor 38 ,38 ,38 \n\t" // v6 | vs38 vec_max_index
"vaddudm 11,10,%[adder] \n\t" //{7,6} vs43
"xxlxor 39,39,39 \n\t" // vs39 vec_max_value
"vaddudm 4,11, %[adder] \n\t" // {9,8} -{8;8} vs36 | v4
XXSPLTD_S(36,36,0)
"xvabsdp 44, 44 \n\t"
"xvabsdp 45, 45 \n\t"
"xvabsdp 46, 46 \n\t"
"xvabsdp 47, 47 \n\t"
"xvabsdp 48, 48 \n\t"
"xvabsdp 49, 49 \n\t"
"xvabsdp 6, 6 \n\t"
"xvabsdp 7, 7 \n\t"
//jump first half forward
"b two%= \n\t"
//===================================================================
".align 5 \n\t"
"one%=: \n\t"
"xvcmpgtdp 2,45,44 \n\t "
"xvcmpgtdp 3,47,46 \n\t "
"xvcmpgtdp 4,49,48 \n\t "
"xvcmpgtdp 5,7,6 \n\t"
"xxsel 32,40,41,2 \n\t"
"xxsel 0,44,45,2 \n\t"
"xxsel 33,42,43,3 \n\t"
"xxsel 1,46,47,3 \n\t"
"xxsel 34,40,41,4 \n\t"
"xxsel 45,48,49,4 \n\t"
"xxsel 35,42,43,5 \n\t"
"xxsel 47,6,7,5 \n\t"
"xvcmpgtdp 2, 1,0 \n\t"
"xvcmpgtdp 3,47, 45 \n\t"
"addi %[ptr_tmp] ,%[ptr_tmp] , 128 \n\t"
"xxsel 32,32,33,2 \n\t"
"xxsel 0 ,0,1,2 \n\t"
"xxsel 34,34,35,3 \n\t"
"xxsel 5,45,47,3 \n\t"
//load next 64
"lxvd2x 44, 0,%[ptr_tmp] \n\t"
"lxvd2x 45, %[i16],%[ptr_tmp] \n\t"
// for {second 8 elements } we have to add 8 to each so that it became {from 8 to 16}
"vaddudm 2,2,4 \n\t" // vs34=vs34 + vs36{8,8}
"lxvd2x 46, %[i32],%[ptr_tmp] \n\t"
"lxvd2x 47, %[i48],%[ptr_tmp] \n\t"
//choose bigger from first and second part
"xvcmpgtdp 4,5 , 0 \n\t"
"xxsel 3, 0,5,4 \n\t"
"xxsel 33,32,34,4 \n\t"
//load next 64
"lxvd2x 48, %[i64],%[ptr_tmp] \n\t"
"lxvd2x 49, %[i80],%[ptr_tmp] \n\t"
"vaddudm 1,1,5 \n\t" // get real index for first bigger
"lxvd2x 6, %[i96],%[ptr_tmp] \n\t"
"lxvd2x 7,%[i112],%[ptr_tmp] \n\t"
//compare with previous to get vec_max_index(v6 | vs38 ) and vec_max_value (vs39)
"xvcmpgtdp 2, 3,39 \n\t"
"xxsel 39,39,3,2 \n\t"
"xxsel 38,38,33,2 \n\t"
//update index += 8
"vaddudm 5,5,4 \n\t"
"xvabsdp 44, 44 \n\t"
"xvabsdp 45, 45 \n\t"
"xvabsdp 46, 46 \n\t"
"xvabsdp 47, 47 \n\t"
//update index += 8
"vaddudm 5,5,4 \n\t"
"xvabsdp 48, 48 \n\t"
"xvabsdp 49, 49 \n\t"
"xvabsdp 6, 6 \n\t"
"xvabsdp 7, 7 \n\t"
//<-----------jump here from first load
"two%=: \n\t"
"xvcmpgtdp 2,45,44 \n\t "
"xvcmpgtdp 3,47,46 \n\t "
"xvcmpgtdp 4,49,48 \n\t "
"xvcmpgtdp 5,7,6 \n\t"
"xxsel 32,40,41,2 \n\t"
"xxsel 0,44,45,2 \n\t"
"xxsel 33,42,43,3 \n\t"
"xxsel 1,46,47,3 \n\t"
"xxsel 34,40,41,4 \n\t"
"xxsel 45,48,49,4 \n\t"
"xxsel 35,42,43,5 \n\t"
"xxsel 47,6,7,5 \n\t"
"xvcmpgtdp 2, 1,0 \n\t"
"xvcmpgtdp 3,47, 45 \n\t"
"xxsel 32,32,33,2 \n\t"
"xxsel 0 ,0,1,2 \n\t"
"xxsel 34,34,35,3 \n\t"
"xxsel 5,45,47,3 \n\t"
"addi %[ptr_tmp] ,%[ptr_tmp] , 128 \n\t"
// for {second 8 elements } we have to add 8 to each so that it became {from 8 to 16}
"vaddudm 2,2,4 \n\t" // vs34=vs34 + vs36{8,8}
//load next 64
"lxvd2x 44, 0,%[ptr_tmp] \n\t"
"lxvd2x 45, %[i16],%[ptr_tmp] \n\t"
"lxvd2x 46, %[i32],%[ptr_tmp] \n\t"
"lxvd2x 47, %[i48],%[ptr_tmp] \n\t"
//choose bigger from first and second part
"xvcmpgtdp 4,5 , 0 \n\t"
"xxsel 3, 0,5,4 \n\t"
"xxsel 33,32,34,4 \n\t"
//load next 64
"lxvd2x 48, %[i64],%[ptr_tmp] \n\t"
"lxvd2x 49, %[i80],%[ptr_tmp] \n\t"
"vaddudm 1,1,5 \n\t" // get real index for first bigger
"lxvd2x 6, %[i96],%[ptr_tmp] \n\t"
"lxvd2x 7,%[i112],%[ptr_tmp] \n\t"
//compare with previous to get vec_max_index(v6 | vs38 ) and vec_max_value (vs39)
"xvcmpgtdp 2, 3,39 \n\t"
"xxsel 39,39,3,2 \n\t"
"xxsel 38,38,33,2 \n\t"
//update index += 8
"vaddudm 5,5,4 \n\t"
"xvabsdp 44, 44 \n\t"
"xvabsdp 45, 45 \n\t"
"xvabsdp 46, 46 \n\t"
"xvabsdp 47, 47 \n\t"
//update index += 8
"vaddudm 5,5,4 \n\t"
"xvabsdp 48, 48 \n\t"
"xvabsdp 49, 49 \n\t"
"xvabsdp 6, 6 \n\t"
"xvabsdp 7, 7 \n\t"
//decrement n
"addic. %[n], %[n], -32 \n\t"
//Loop back if >0
"bgt+ one%= \n\t"
//==============================================================================
"xvcmpgtdp 2,45,44 \n\t "
"xvcmpgtdp 3,47,46 \n\t "
"xvcmpgtdp 4,49,48 \n\t "
"xvcmpgtdp 5,7,6 \n\t"
"xxsel 32,40,41,2 \n\t"
"xxsel 0,44,45,2 \n\t"
"xxsel 33,42,43,3 \n\t"
"xxsel 1,46,47,3 \n\t"
"xxsel 34,40,41,4 \n\t"
"xxsel 45,48,49,4 \n\t"
"xxsel 35,42,43,5 \n\t"
"xxsel 47,6,7,5 \n\t"
"xvcmpgtdp 2, 1,0 \n\t"
"xvcmpgtdp 3,47, 45 \n\t"
"xxsel 32,32,33,2 \n\t"
"xxsel 0 ,0,1,2 \n\t"
"xxsel 34,34,35,3 \n\t"
"xxsel 5,45,47,3 \n\t"
// for {second 8 elements } we have to add 8 to each so that it became {from 8 to 16}
"vaddudm 2,2,4 \n\t" // vs34=vs34 + vs36{8,8}
//choose bigger from first and second part
"xvcmpgtdp 4,5 , 0 \n\t"
"xxsel 3, 0,5,4 \n\t"
"xxsel 33,32,34,4 \n\t"
"vaddudm 1,1,5 \n\t" // get real index for first bigger
//compare with previous to get vec_max_index(v6 | vs38 ) and vec_max_value (vs39)
"xvcmpgtdp 2, 3,39 \n\t"
"xxsel 39,39,3,2 \n\t"
"xxsel 38,38,33,2 \n\t"
///////extract max value and max index from vector
XXSPLTD_S(32,38,1)
XXSPLTD_S(40,39,1)
"xvcmpeqdp. 2, 40,39 \n\t"
//cr6 0 bit set if all true, cr6=4*6+bit_ind=24,0011at CR(BI)==1, at=10 hint that it occurs rarely
//0b001110=14
"bc 14,24, three%= \n\t"
"xvcmpgtdp 4, 40,39 \n\t"
"xxsel 0,39,40,4 \n\t"
"xxsel 1,38,32,4 \n\t"
"stxsdx 0,0,%[ptr_maxf] \n\t"
"b four%= \n\t"
"three%=: \n\t"
//if elements value are equal then choose minimum index
XXSPLTD_S(0,40,0)
"vminud 0,0,6 \n\t" //vs32 vs38
"xxlor 1,32,32 \n\t"
"stxsdx 0,0,%[ptr_maxf] \n\t"
"four%=: \n\t"
"mfvsrd %[index],1 \n\t"
: [maxf] "=m"(*maxf),[ptr_tmp] "+&b"(x),[index] "=r"(index), [n] "+&r"(n)
: [mem] "m"(*(const double (*)[n])x), [ptr_x] "b"(x), [ptr_maxf] "b"(maxf) ,
[i16] "b"(16), [i32] "b"(32), [i48] "b"(48),
[i64] "b"(64), [i80] "b"(80), [i96] "b"(96), [i112] "b"(112),
[start] "v"(start), [adder] "v"(temp_add_index)
: "cc", "vs0", "vs1","vs2","vs3", "vs4","vs5","vs32", "vs33", "vs34", "vs35", "vs36",
"vs37", "vs38", "vs39", "vs40", "vs41", "vs42", "vs43", "vs44", "vs45", "vs46", "vs47", "vs48", "vs49", "vs6", "vs7"
);
return index;
}
#endif
BLASLONG CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x) {
BLASLONG i = 0;
BLASLONG j = 0;
FLOAT maxf = 0.0;
BLASLONG max = 0;
if (n <= 0 || inc_x <= 0) return (max);
if (inc_x == 1) {
#if defined(_CALL_ELF) && (_CALL_ELF == 2)
#if defined(__VEC__) || defined(__ALTIVEC__)
BLASLONG n1 = n & -32;
if (n1 > 0) {
max = diamax_kernel_32(n1, x, &maxf);
i = n1;
}
#endif
#endif
while (i < n) {
if (ABS(x[i]) > maxf) {
max = i;
maxf = ABS(x[i]);
}
i++;
}
return (max + 1);
} else {
BLASLONG n1 = n & -4;
while (j < n1) {
if (ABS(x[i]) > maxf) {
max = j;
maxf = ABS(x[i]);
}
if (ABS(x[i + inc_x]) > maxf) {
max = j + 1;
maxf = ABS(x[i + inc_x]);
}
if (ABS(x[i + 2 * inc_x]) > maxf) {
max = j + 2;
maxf = ABS(x[i + 2 * inc_x]);
}
if (ABS(x[i + 3 * inc_x]) > maxf) {
max = j + 3;
maxf = ABS(x[i + 3 * inc_x]);
}
i += inc_x * 4;
j += 4;
}
while (j < n) {
if (ABS(x[i]) > maxf) {
max = j;
maxf = ABS(x[i]);
}
i += inc_x;
j++;
}
return (max + 1);
}
}
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