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izamax.S
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/*******************************************************************************
Copyright (c) 2015, 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.
*******************************************************************************/
#define ASSEMBLER
#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 I x5 /* loop variable */
/*******************************************************************************
* Macro definitions
*******************************************************************************/
#if defined(USE_MIN)
#define COND le
#else
#define COND ge
#endif
#if !defined(DOUBLE)
#define MAXF s0
#define TMPF s1
#define TMPVF {v1.s}[0]
#define SZ 4
#else
#define MAXF d0
#define TMPF d1
#define TMPVF {v1.d}[0]
#define SZ 8
#endif
/******************************************************************************/
.macro INIT_S
#if !defined(DOUBLE)
lsl INC_X, INC_X, #3
ld1 {v0.2s}, [X], INC_X
mov Z, #1
mov INDEX, Z
fabs v0.2s, v0.2s
ext v1.8b, v0.8b, v0.8b, #4
fadd MAXF, s0, s1
#else
lsl INC_X, INC_X, #4
ld1 {v0.2d}, [X], INC_X
mov Z, #1
mov INDEX, Z
fabs v0.2d, v0.2d
faddp MAXF, v0.2d
#endif
.endm
.macro KERNEL_F8
#if !defined(DOUBLE)
ldp q2, q3, [X], #32
ldp q4, q5, [X], #32
fabs v2.4s, v2.4s
fabs v3.4s, v3.4s
fabs v4.4s, v4.4s
fabs v5.4s, v5.4s
faddp v2.4s, v2.4s, v3.4s
faddp v3.4s, v4.4s, v5.4s
fmax v2.4s, v2.4s, v3.4s
fmaxv TMPF, v2.4s
fcmp MAXF, TMPF
fcsel MAXF, MAXF, TMPF, COND
csel INDEX, INDEX, Z, COND
add Z, Z, #8
#else
ldp q2, q3, [X], #32
ldp q4, q5, [X], #32
ldp q16, q17, [X], #32
ldp q18, q19, [X], #32
fabs v2.2d, v2.2d
fabs v3.2d, v3.2d
fabs v4.2d, v4.2d
fabs v5.2d, v5.2d
fabs v16.2d, v16.2d
fabs v17.2d, v17.2d
fabs v18.2d, v18.2d
fabs v19.2d, v19.2d
faddp v2.2d, v2.2d, v3.2d
faddp v3.2d, v4.2d, v5.2d
faddp v4.2d, v16.2d, v17.2d
faddp v5.2d, v18.2d, v19.2d
fmax v2.2d, v2.2d, v3.2d
fmax v4.2d, v4.2d, v5.2d
fmax v2.2d, v2.2d, v4.2d
fmaxp TMPF, v2.2d
fcmp MAXF, TMPF
fcsel MAXF, MAXF, TMPF, COND
csel INDEX, INDEX, Z, COND
add Z, Z, #8
#endif
PRFM PLDL1KEEP, [X, #1024]
.endm
.macro KERNEL_F8_FINALIZE
sub x6, INDEX, #1
#if !defined(DOUBLE)
lsl x6, x6, #3
add x7, x7, x6
ldp q2, q3, [x7]
ldp q4, q5, [x7, #32]
fabs v2.4s, v2.4s
fabs v3.4s, v3.4s
fabs v4.4s, v4.4s
fabs v5.4s, v5.4s
faddp v2.4s, v2.4s, v3.4s
faddp v3.4s, v4.4s, v5.4s
ins v4.s[0], v3.s[3]
add x6, INDEX, #7
fcmp MAXF, s4
csel INDEX, x6, INDEX, eq
ins v4.s[0], v3.s[2]
sub x6, x6, #1
fcmp MAXF, s4
csel INDEX, x6, INDEX, eq
ins v4.s[0], v3.s[1]
sub x6, x6, #1
fcmp MAXF, s4
csel INDEX, x6, INDEX, eq
ins v4.s[0], v3.s[0]
sub x6, x6, #1
fcmp MAXF, s4
csel INDEX, x6, INDEX, eq
ins v4.s[0], v2.s[3]
sub x6, x6, #1
fcmp MAXF, s4
csel INDEX, x6, INDEX, eq
ins v4.s[0], v2.s[2]
sub x6, x6, #1
fcmp MAXF, s4
csel INDEX, x6, INDEX, eq
ins v4.s[0], v2.s[1]
sub x6, x6, #1
fcmp MAXF, s4
csel INDEX, x6, INDEX, eq
ins v4.s[0], v2.s[0]
sub x6, x6, #1
fcmp MAXF, s4
csel INDEX, x6, INDEX, eq
#else
lsl x6, x6, #4
add x7, x7, x6
ldp q2, q3, [x7]
ldp q4, q5, [x7, #32]
ldp q16, q17, [x7, #64]
ldp q18, q19, [x7, #96]
fabs v2.2d, v2.2d
fabs v3.2d, v3.2d
fabs v4.2d, v4.2d
fabs v5.2d, v5.2d
fabs v16.2d, v16.2d
fabs v17.2d, v17.2d
fabs v18.2d, v18.2d
fabs v19.2d, v19.2d
faddp v2.2d, v2.2d, v3.2d
faddp v3.2d, v4.2d, v5.2d
faddp v4.2d, v16.2d, v17.2d
faddp v5.2d, v18.2d, v19.2d
ins v7.d[0], v5.d[1]
add x6, INDEX, #7
fcmp MAXF, d7
csel INDEX, x6, INDEX, eq
ins v7.d[0], v5.d[0]
sub x6, x6, #1
fcmp MAXF, d7
csel INDEX, x6, INDEX, eq
ins v7.d[0], v4.d[1]
sub x6, x6, #1
fcmp MAXF, d7
csel INDEX, x6, INDEX, eq
ins v7.d[0], v4.d[0]
sub x6, x6, #1
fcmp MAXF, d7
csel INDEX, x6, INDEX, eq
ins v7.d[0], v3.d[1]
sub x6, x6, #1
fcmp MAXF, d7
csel INDEX, x6, INDEX, eq
ins v7.d[0], v3.d[0]
sub x6, x6, #1
fcmp MAXF, d7
csel INDEX, x6, INDEX, eq
ins v7.d[0], v2.d[1]
sub x6, x6, #1
fcmp MAXF, d7
csel INDEX, x6, INDEX, eq
ins v7.d[0], v2.d[0]
sub x6, x6, #1
fcmp MAXF, d7
csel INDEX, x6, INDEX, eq
#endif
.endm
.macro KERNEL_S1
#if !defined(DOUBLE)
ld1 {v1.2s}, [X], INC_X
add Z, Z, #1
fabs v1.2s, v1.2s
ext v2.8b, v1.8b, v1.8b, #4
fadd TMPF, s1, s2
#else
ld1 {v1.2d}, [X], INC_X
add Z, Z, #1
fabs v1.2d, v1.2d
faddp TMPF, v1.2d
#endif
fcmp MAXF, TMPF
fcsel MAXF, MAXF, TMPF, COND
csel INDEX, INDEX, Z, COND
.endm
/*******************************************************************************
* End of macro definitions
*******************************************************************************/
PROLOGUE
cmp N, xzr
ble .Lizamax_kernel_zero
cmp INC_X, xzr
ble .Lizamax_kernel_zero
cmp INC_X, #1
bne .Lizamax_kernel_S_BEGIN
mov x7, X
.Lizamax_kernel_F_BEGIN:
INIT_S
subs N, N, #1
ble .Lizamax_kernel_L999
asr I, N, #3
cmp I, xzr
ble .Lizamax_kernel_F1
add Z, Z, #1
.Lizamax_kernel_F8:
KERNEL_F8
subs I, I, #1
bne .Lizamax_kernel_F8
KERNEL_F8_FINALIZE
sub Z, Z, #1
.Lizamax_kernel_F1:
ands I, N, #7
ble .Lizamax_kernel_L999
.Lizamax_kernel_F10:
KERNEL_S1
subs I, I, #1
bne .Lizamax_kernel_F10
b .Lizamax_kernel_L999
.Lizamax_kernel_S_BEGIN:
INIT_S
subs N, N, #1
ble .Lizamax_kernel_L999
asr I, N, #2
cmp I, xzr
ble .Lizamax_kernel_S1
.Lizamax_kernel_S4:
KERNEL_S1
KERNEL_S1
KERNEL_S1
KERNEL_S1
subs I, I, #1
bne .Lizamax_kernel_S4
.Lizamax_kernel_S1:
ands I, N, #3
ble .Lizamax_kernel_L999
.Lizamax_kernel_S10:
KERNEL_S1
subs I, I, #1
bne .Lizamax_kernel_S10
.Lizamax_kernel_L999:
mov x0, INDEX
ret
.Lizamax_kernel_zero:
mov x0, xzr
ret
EPILOGUE