mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-09 23:00:07 +00:00
x86-64: Add memcmp family functions with 256-bit EVEX
Update ifunc-memcmp.h to select the function optimized with 256-bit EVEX
instructions using YMM16-YMM31 registers to avoid RTM abort with usable
AVX512VL, AVX512BW and MOVBE since VZEROUPPER isn't needed at function
exit.
(cherry picked from commit 91264fe357)
This commit is contained in:
H.J. Lu
parent
9650d04fb6
commit
757d90ff37
@ -45,6 +45,7 @@ sysdep_routines += strncat-c stpncpy-c strncpy-c \
|
||||
memset-avx2-unaligned-erms \
|
||||
memset-avx512-unaligned-erms \
|
||||
memchr-evex \
|
||||
memcmp-evex-movbe \
|
||||
memmove-evex-unaligned-erms \
|
||||
memrchr-evex \
|
||||
memset-evex-unaligned-erms \
|
||||
@ -85,7 +86,8 @@ sysdep_routines += wmemcmp-sse4 wmemcmp-ssse3 wmemcmp-c \
|
||||
wcsncmp-evex \
|
||||
wcsnlen-evex \
|
||||
wcsrchr-evex \
|
||||
wmemchr-evex
|
||||
wmemchr-evex \
|
||||
wmemcmp-evex-movbe
|
||||
endif
|
||||
|
||||
ifeq ($(subdir),debug)
|
||||
|
||||
@ -56,6 +56,11 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
|
||||
(HAS_ARCH_FEATURE (AVX2_Usable)
|
||||
&& HAS_CPU_FEATURE (MOVBE)),
|
||||
__memcmp_avx2_movbe)
|
||||
IFUNC_IMPL_ADD (array, i, memcmp,
|
||||
(HAS_ARCH_FEATURE (AVX512VL_Usable)
|
||||
&& HAS_ARCH_FEATURE (AVX512BW_Usable)
|
||||
&& HAS_CPU_FEATURE (MOVBE)),
|
||||
__memcmp_evex_movbe)
|
||||
IFUNC_IMPL_ADD (array, i, memcmp, HAS_CPU_FEATURE (SSE4_1),
|
||||
__memcmp_sse4_1)
|
||||
IFUNC_IMPL_ADD (array, i, memcmp, HAS_CPU_FEATURE (SSSE3),
|
||||
@ -558,6 +563,11 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
|
||||
(HAS_ARCH_FEATURE (AVX2_Usable)
|
||||
&& HAS_CPU_FEATURE (MOVBE)),
|
||||
__wmemcmp_avx2_movbe)
|
||||
IFUNC_IMPL_ADD (array, i, wmemcmp,
|
||||
(HAS_ARCH_FEATURE (AVX512VL_Usable)
|
||||
&& HAS_ARCH_FEATURE (AVX512BW_Usable)
|
||||
&& HAS_CPU_FEATURE (MOVBE)),
|
||||
__wmemcmp_evex_movbe)
|
||||
IFUNC_IMPL_ADD (array, i, wmemcmp, HAS_CPU_FEATURE (SSE4_1),
|
||||
__wmemcmp_sse4_1)
|
||||
IFUNC_IMPL_ADD (array, i, wmemcmp, HAS_CPU_FEATURE (SSSE3),
|
||||
|
||||
@ -23,17 +23,24 @@ extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2) attribute_hidden;
|
||||
extern __typeof (REDIRECT_NAME) OPTIMIZE (ssse3) attribute_hidden;
|
||||
extern __typeof (REDIRECT_NAME) OPTIMIZE (sse4_1) attribute_hidden;
|
||||
extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_movbe) attribute_hidden;
|
||||
extern __typeof (REDIRECT_NAME) OPTIMIZE (evex_movbe) attribute_hidden;
|
||||
|
||||
static inline void *
|
||||
IFUNC_SELECTOR (void)
|
||||
{
|
||||
const struct cpu_features* cpu_features = __get_cpu_features ();
|
||||
|
||||
if (!CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER)
|
||||
&& CPU_FEATURES_ARCH_P (cpu_features, AVX2_Usable)
|
||||
if (CPU_FEATURES_ARCH_P (cpu_features, AVX2_Usable)
|
||||
&& CPU_FEATURES_CPU_P (cpu_features, MOVBE)
|
||||
&& CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load))
|
||||
return OPTIMIZE (avx2_movbe);
|
||||
{
|
||||
if (CPU_FEATURES_ARCH_P (cpu_features, AVX512VL_Usable)
|
||||
&& CPU_FEATURES_ARCH_P (cpu_features, AVX512BW_Usable))
|
||||
return OPTIMIZE (evex_movbe);
|
||||
|
||||
if (!CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER))
|
||||
return OPTIMIZE (avx2_movbe);
|
||||
}
|
||||
|
||||
if (CPU_FEATURES_CPU_P (cpu_features, SSE4_1))
|
||||
return OPTIMIZE (sse4_1);
|
||||
|
||||
440
sysdeps/x86_64/multiarch/memcmp-evex-movbe.S
Normal file
440
sysdeps/x86_64/multiarch/memcmp-evex-movbe.S
Normal file
@ -0,0 +1,440 @@
|
||||
/* memcmp/wmemcmp optimized with 256-bit EVEX instructions.
|
||||
Copyright (C) 2021 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
|
||||
The GNU C Library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
||||
version 2.1 of the License, or (at your option) any later version.
|
||||
|
||||
The GNU C Library is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public
|
||||
License along with the GNU C Library; if not, see
|
||||
<https://www.gnu.org/licenses/>. */
|
||||
|
||||
#if IS_IN (libc)
|
||||
|
||||
/* memcmp/wmemcmp is implemented as:
|
||||
1. For size from 2 to 7 bytes, load as big endian with movbe and bswap
|
||||
to avoid branches.
|
||||
2. Use overlapping compare to avoid branch.
|
||||
3. Use vector compare when size >= 4 bytes for memcmp or size >= 8
|
||||
bytes for wmemcmp.
|
||||
4. If size is 8 * VEC_SIZE or less, unroll the loop.
|
||||
5. Compare 4 * VEC_SIZE at a time with the aligned first memory
|
||||
area.
|
||||
6. Use 2 vector compares when size is 2 * VEC_SIZE or less.
|
||||
7. Use 4 vector compares when size is 4 * VEC_SIZE or less.
|
||||
8. Use 8 vector compares when size is 8 * VEC_SIZE or less. */
|
||||
|
||||
# include <sysdep.h>
|
||||
|
||||
# ifndef MEMCMP
|
||||
# define MEMCMP __memcmp_evex_movbe
|
||||
# endif
|
||||
|
||||
# define VMOVU vmovdqu64
|
||||
|
||||
# ifdef USE_AS_WMEMCMP
|
||||
# define VPCMPEQ vpcmpeqd
|
||||
# else
|
||||
# define VPCMPEQ vpcmpeqb
|
||||
# endif
|
||||
|
||||
# define XMM1 xmm17
|
||||
# define XMM2 xmm18
|
||||
# define YMM1 ymm17
|
||||
# define YMM2 ymm18
|
||||
# define YMM3 ymm19
|
||||
# define YMM4 ymm20
|
||||
# define YMM5 ymm21
|
||||
# define YMM6 ymm22
|
||||
|
||||
# define VEC_SIZE 32
|
||||
# ifdef USE_AS_WMEMCMP
|
||||
# define VEC_MASK 0xff
|
||||
# define XMM_MASK 0xf
|
||||
# else
|
||||
# define VEC_MASK 0xffffffff
|
||||
# define XMM_MASK 0xffff
|
||||
# endif
|
||||
|
||||
/* Warning!
|
||||
wmemcmp has to use SIGNED comparison for elements.
|
||||
memcmp has to use UNSIGNED comparison for elemnts.
|
||||
*/
|
||||
|
||||
.section .text.evex,"ax",@progbits
|
||||
ENTRY (MEMCMP)
|
||||
# ifdef USE_AS_WMEMCMP
|
||||
shl $2, %RDX_LP
|
||||
# elif defined __ILP32__
|
||||
/* Clear the upper 32 bits. */
|
||||
movl %edx, %edx
|
||||
# endif
|
||||
cmp $VEC_SIZE, %RDX_LP
|
||||
jb L(less_vec)
|
||||
|
||||
/* From VEC to 2 * VEC. No branch when size == VEC_SIZE. */
|
||||
VMOVU (%rsi), %YMM2
|
||||
VPCMPEQ (%rdi), %YMM2, %k1
|
||||
kmovd %k1, %eax
|
||||
subl $VEC_MASK, %eax
|
||||
jnz L(first_vec)
|
||||
|
||||
cmpq $(VEC_SIZE * 2), %rdx
|
||||
jbe L(last_vec)
|
||||
|
||||
/* More than 2 * VEC. */
|
||||
cmpq $(VEC_SIZE * 8), %rdx
|
||||
ja L(more_8x_vec)
|
||||
cmpq $(VEC_SIZE * 4), %rdx
|
||||
jb L(last_4x_vec)
|
||||
|
||||
/* From 4 * VEC to 8 * VEC, inclusively. */
|
||||
VMOVU (%rsi), %YMM1
|
||||
VPCMPEQ (%rdi), %YMM1, %k1
|
||||
|
||||
VMOVU VEC_SIZE(%rsi), %YMM2
|
||||
VPCMPEQ VEC_SIZE(%rdi), %YMM2, %k2
|
||||
|
||||
VMOVU (VEC_SIZE * 2)(%rsi), %YMM3
|
||||
VPCMPEQ (VEC_SIZE * 2)(%rdi), %YMM3, %k3
|
||||
|
||||
VMOVU (VEC_SIZE * 3)(%rsi), %YMM4
|
||||
VPCMPEQ (VEC_SIZE * 3)(%rdi), %YMM4, %k4
|
||||
|
||||
kandd %k1, %k2, %k5
|
||||
kandd %k3, %k4, %k6
|
||||
kandd %k5, %k6, %k6
|
||||
|
||||
kmovd %k6, %eax
|
||||
cmpl $VEC_MASK, %eax
|
||||
jne L(4x_vec_end)
|
||||
|
||||
leaq -(4 * VEC_SIZE)(%rdi, %rdx), %rdi
|
||||
leaq -(4 * VEC_SIZE)(%rsi, %rdx), %rsi
|
||||
VMOVU (%rsi), %YMM1
|
||||
VPCMPEQ (%rdi), %YMM1, %k1
|
||||
|
||||
VMOVU VEC_SIZE(%rsi), %YMM2
|
||||
VPCMPEQ VEC_SIZE(%rdi), %YMM2, %k2
|
||||
kandd %k1, %k2, %k5
|
||||
|
||||
VMOVU (VEC_SIZE * 2)(%rsi), %YMM3
|
||||
VPCMPEQ (VEC_SIZE * 2)(%rdi), %YMM3, %k3
|
||||
kandd %k3, %k5, %k5
|
||||
|
||||
VMOVU (VEC_SIZE * 3)(%rsi), %YMM4
|
||||
VPCMPEQ (VEC_SIZE * 3)(%rdi), %YMM4, %k4
|
||||
kandd %k4, %k5, %k5
|
||||
|
||||
kmovd %k5, %eax
|
||||
cmpl $VEC_MASK, %eax
|
||||
jne L(4x_vec_end)
|
||||
xorl %eax, %eax
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(last_2x_vec):
|
||||
/* From VEC to 2 * VEC. No branch when size == VEC_SIZE. */
|
||||
VMOVU (%rsi), %YMM2
|
||||
VPCMPEQ (%rdi), %YMM2, %k2
|
||||
kmovd %k2, %eax
|
||||
subl $VEC_MASK, %eax
|
||||
jnz L(first_vec)
|
||||
|
||||
L(last_vec):
|
||||
/* Use overlapping loads to avoid branches. */
|
||||
leaq -VEC_SIZE(%rdi, %rdx), %rdi
|
||||
leaq -VEC_SIZE(%rsi, %rdx), %rsi
|
||||
VMOVU (%rsi), %YMM2
|
||||
VPCMPEQ (%rdi), %YMM2, %k2
|
||||
kmovd %k2, %eax
|
||||
subl $VEC_MASK, %eax
|
||||
jnz L(first_vec)
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(first_vec):
|
||||
/* A byte or int32 is different within 16 or 32 bytes. */
|
||||
tzcntl %eax, %ecx
|
||||
# ifdef USE_AS_WMEMCMP
|
||||
xorl %eax, %eax
|
||||
movl (%rdi, %rcx, 4), %edx
|
||||
cmpl (%rsi, %rcx, 4), %edx
|
||||
L(wmemcmp_return):
|
||||
setl %al
|
||||
negl %eax
|
||||
orl $1, %eax
|
||||
# else
|
||||
movzbl (%rdi, %rcx), %eax
|
||||
movzbl (%rsi, %rcx), %edx
|
||||
sub %edx, %eax
|
||||
# endif
|
||||
ret
|
||||
|
||||
# ifdef USE_AS_WMEMCMP
|
||||
.p2align 4
|
||||
L(4):
|
||||
xorl %eax, %eax
|
||||
movl (%rdi), %edx
|
||||
cmpl (%rsi), %edx
|
||||
jne L(wmemcmp_return)
|
||||
ret
|
||||
# else
|
||||
.p2align 4
|
||||
L(between_4_7):
|
||||
/* Load as big endian with overlapping movbe to avoid branches. */
|
||||
movbe (%rdi), %eax
|
||||
movbe (%rsi), %ecx
|
||||
shlq $32, %rax
|
||||
shlq $32, %rcx
|
||||
movbe -4(%rdi, %rdx), %edi
|
||||
movbe -4(%rsi, %rdx), %esi
|
||||
orq %rdi, %rax
|
||||
orq %rsi, %rcx
|
||||
subq %rcx, %rax
|
||||
je L(exit)
|
||||
sbbl %eax, %eax
|
||||
orl $1, %eax
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(exit):
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(between_2_3):
|
||||
/* Load as big endian to avoid branches. */
|
||||
movzwl (%rdi), %eax
|
||||
movzwl (%rsi), %ecx
|
||||
shll $8, %eax
|
||||
shll $8, %ecx
|
||||
bswap %eax
|
||||
bswap %ecx
|
||||
movb -1(%rdi, %rdx), %al
|
||||
movb -1(%rsi, %rdx), %cl
|
||||
/* Subtraction is okay because the upper 8 bits are zero. */
|
||||
subl %ecx, %eax
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(1):
|
||||
movzbl (%rdi), %eax
|
||||
movzbl (%rsi), %ecx
|
||||
subl %ecx, %eax
|
||||
ret
|
||||
# endif
|
||||
|
||||
.p2align 4
|
||||
L(zero):
|
||||
xorl %eax, %eax
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(less_vec):
|
||||
# ifdef USE_AS_WMEMCMP
|
||||
/* It can only be 0, 4, 8, 12, 16, 20, 24, 28 bytes. */
|
||||
cmpb $4, %dl
|
||||
je L(4)
|
||||
jb L(zero)
|
||||
# else
|
||||
cmpb $1, %dl
|
||||
je L(1)
|
||||
jb L(zero)
|
||||
cmpb $4, %dl
|
||||
jb L(between_2_3)
|
||||
cmpb $8, %dl
|
||||
jb L(between_4_7)
|
||||
# endif
|
||||
cmpb $16, %dl
|
||||
jae L(between_16_31)
|
||||
/* It is between 8 and 15 bytes. */
|
||||
vmovq (%rdi), %XMM1
|
||||
vmovq (%rsi), %XMM2
|
||||
VPCMPEQ %XMM1, %XMM2, %k2
|
||||
kmovw %k2, %eax
|
||||
subl $XMM_MASK, %eax
|
||||
jnz L(first_vec)
|
||||
/* Use overlapping loads to avoid branches. */
|
||||
leaq -8(%rdi, %rdx), %rdi
|
||||
leaq -8(%rsi, %rdx), %rsi
|
||||
vmovq (%rdi), %XMM1
|
||||
vmovq (%rsi), %XMM2
|
||||
VPCMPEQ %XMM1, %XMM2, %k2
|
||||
kmovw %k2, %eax
|
||||
subl $XMM_MASK, %eax
|
||||
jnz L(first_vec)
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(between_16_31):
|
||||
/* From 16 to 31 bytes. No branch when size == 16. */
|
||||
VMOVU (%rsi), %XMM2
|
||||
VPCMPEQ (%rdi), %XMM2, %k2
|
||||
kmovw %k2, %eax
|
||||
subl $XMM_MASK, %eax
|
||||
jnz L(first_vec)
|
||||
|
||||
/* Use overlapping loads to avoid branches. */
|
||||
leaq -16(%rdi, %rdx), %rdi
|
||||
leaq -16(%rsi, %rdx), %rsi
|
||||
VMOVU (%rsi), %XMM2
|
||||
VPCMPEQ (%rdi), %XMM2, %k2
|
||||
kmovw %k2, %eax
|
||||
subl $XMM_MASK, %eax
|
||||
jnz L(first_vec)
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(more_8x_vec):
|
||||
/* More than 8 * VEC. Check the first VEC. */
|
||||
VMOVU (%rsi), %YMM2
|
||||
VPCMPEQ (%rdi), %YMM2, %k2
|
||||
kmovd %k2, %eax
|
||||
subl $VEC_MASK, %eax
|
||||
jnz L(first_vec)
|
||||
|
||||
/* Align the first memory area for aligned loads in the loop.
|
||||
Compute how much the first memory area is misaligned. */
|
||||
movq %rdi, %rcx
|
||||
andl $(VEC_SIZE - 1), %ecx
|
||||
/* Get the negative of offset for alignment. */
|
||||
subq $VEC_SIZE, %rcx
|
||||
/* Adjust the second memory area. */
|
||||
subq %rcx, %rsi
|
||||
/* Adjust the first memory area which should be aligned now. */
|
||||
subq %rcx, %rdi
|
||||
/* Adjust length. */
|
||||
addq %rcx, %rdx
|
||||
|
||||
L(loop_4x_vec):
|
||||
/* Compare 4 * VEC at a time forward. */
|
||||
VMOVU (%rsi), %YMM1
|
||||
VPCMPEQ (%rdi), %YMM1, %k1
|
||||
|
||||
VMOVU VEC_SIZE(%rsi), %YMM2
|
||||
VPCMPEQ VEC_SIZE(%rdi), %YMM2, %k2
|
||||
kandd %k2, %k1, %k5
|
||||
|
||||
VMOVU (VEC_SIZE * 2)(%rsi), %YMM3
|
||||
VPCMPEQ (VEC_SIZE * 2)(%rdi), %YMM3, %k3
|
||||
kandd %k3, %k5, %k5
|
||||
|
||||
VMOVU (VEC_SIZE * 3)(%rsi), %YMM4
|
||||
VPCMPEQ (VEC_SIZE * 3)(%rdi), %YMM4, %k4
|
||||
kandd %k4, %k5, %k5
|
||||
|
||||
kmovd %k5, %eax
|
||||
cmpl $VEC_MASK, %eax
|
||||
jne L(4x_vec_end)
|
||||
|
||||
addq $(VEC_SIZE * 4), %rdi
|
||||
addq $(VEC_SIZE * 4), %rsi
|
||||
|
||||
subq $(VEC_SIZE * 4), %rdx
|
||||
cmpq $(VEC_SIZE * 4), %rdx
|
||||
jae L(loop_4x_vec)
|
||||
|
||||
/* Less than 4 * VEC. */
|
||||
cmpq $VEC_SIZE, %rdx
|
||||
jbe L(last_vec)
|
||||
cmpq $(VEC_SIZE * 2), %rdx
|
||||
jbe L(last_2x_vec)
|
||||
|
||||
L(last_4x_vec):
|
||||
/* From 2 * VEC to 4 * VEC. */
|
||||
VMOVU (%rsi), %YMM2
|
||||
VPCMPEQ (%rdi), %YMM2, %k2
|
||||
kmovd %k2, %eax
|
||||
subl $VEC_MASK, %eax
|
||||
jnz L(first_vec)
|
||||
|
||||
addq $VEC_SIZE, %rdi
|
||||
addq $VEC_SIZE, %rsi
|
||||
VMOVU (%rsi), %YMM2
|
||||
VPCMPEQ (%rdi), %YMM2, %k2
|
||||
kmovd %k2, %eax
|
||||
subl $VEC_MASK, %eax
|
||||
jnz L(first_vec)
|
||||
|
||||
/* Use overlapping loads to avoid branches. */
|
||||
leaq -(3 * VEC_SIZE)(%rdi, %rdx), %rdi
|
||||
leaq -(3 * VEC_SIZE)(%rsi, %rdx), %rsi
|
||||
VMOVU (%rsi), %YMM2
|
||||
VPCMPEQ (%rdi), %YMM2, %k2
|
||||
kmovd %k2, %eax
|
||||
subl $VEC_MASK, %eax
|
||||
jnz L(first_vec)
|
||||
|
||||
addq $VEC_SIZE, %rdi
|
||||
addq $VEC_SIZE, %rsi
|
||||
VMOVU (%rsi), %YMM2
|
||||
VPCMPEQ (%rdi), %YMM2, %k2
|
||||
kmovd %k2, %eax
|
||||
subl $VEC_MASK, %eax
|
||||
jnz L(first_vec)
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(4x_vec_end):
|
||||
kmovd %k1, %eax
|
||||
subl $VEC_MASK, %eax
|
||||
jnz L(first_vec)
|
||||
kmovd %k2, %eax
|
||||
subl $VEC_MASK, %eax
|
||||
jnz L(first_vec_x1)
|
||||
kmovd %k3, %eax
|
||||
subl $VEC_MASK, %eax
|
||||
jnz L(first_vec_x2)
|
||||
kmovd %k4, %eax
|
||||
subl $VEC_MASK, %eax
|
||||
tzcntl %eax, %ecx
|
||||
# ifdef USE_AS_WMEMCMP
|
||||
xorl %eax, %eax
|
||||
movl (VEC_SIZE * 3)(%rdi, %rcx, 4), %edx
|
||||
cmpl (VEC_SIZE * 3)(%rsi, %rcx, 4), %edx
|
||||
jmp L(wmemcmp_return)
|
||||
# else
|
||||
movzbl (VEC_SIZE * 3)(%rdi, %rcx), %eax
|
||||
movzbl (VEC_SIZE * 3)(%rsi, %rcx), %edx
|
||||
sub %edx, %eax
|
||||
# endif
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(first_vec_x1):
|
||||
tzcntl %eax, %ecx
|
||||
# ifdef USE_AS_WMEMCMP
|
||||
xorl %eax, %eax
|
||||
movl VEC_SIZE(%rdi, %rcx, 4), %edx
|
||||
cmpl VEC_SIZE(%rsi, %rcx, 4), %edx
|
||||
jmp L(wmemcmp_return)
|
||||
# else
|
||||
movzbl VEC_SIZE(%rdi, %rcx), %eax
|
||||
movzbl VEC_SIZE(%rsi, %rcx), %edx
|
||||
sub %edx, %eax
|
||||
# endif
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(first_vec_x2):
|
||||
tzcntl %eax, %ecx
|
||||
# ifdef USE_AS_WMEMCMP
|
||||
xorl %eax, %eax
|
||||
movl (VEC_SIZE * 2)(%rdi, %rcx, 4), %edx
|
||||
cmpl (VEC_SIZE * 2)(%rsi, %rcx, 4), %edx
|
||||
jmp L(wmemcmp_return)
|
||||
# else
|
||||
movzbl (VEC_SIZE * 2)(%rdi, %rcx), %eax
|
||||
movzbl (VEC_SIZE * 2)(%rsi, %rcx), %edx
|
||||
sub %edx, %eax
|
||||
# endif
|
||||
ret
|
||||
END (MEMCMP)
|
||||
#endif
|
||||
4
sysdeps/x86_64/multiarch/wmemcmp-evex-movbe.S
Normal file
4
sysdeps/x86_64/multiarch/wmemcmp-evex-movbe.S
Normal file
@ -0,0 +1,4 @@
|
||||
#define MEMCMP __wmemcmp_evex_movbe
|
||||
#define USE_AS_WMEMCMP 1
|
||||
|
||||
#include "memcmp-evex-movbe.S"
|
||||
Loading…
Reference in New Issue
Block a user