mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-14 01:00:07 +00:00
x86: Optimize memchr-evex.S
No bug. This commit optimizes memchr-evex.S. The optimizations include
replacing some branches with cmovcc, avoiding some branches entirely
in the less_4x_vec case, making the page cross logic less strict,
saving some ALU in the alignment process, and most importantly
increasing ILP in the 4x loop. test-memchr, test-rawmemchr, and
test-wmemchr are all passing.
Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com>
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
(cherry picked from commit 2a76821c30)
This commit is contained in:
Noah Goldstein
H.J. Lu
parent
86250b81da
commit
68e438825d
@ -26,14 +26,28 @@
|
||||
|
||||
# ifdef USE_AS_WMEMCHR
|
||||
# define VPBROADCAST vpbroadcastd
|
||||
# define VPCMP vpcmpd
|
||||
# define SHIFT_REG r8d
|
||||
# define VPMINU vpminud
|
||||
# define VPCMP vpcmpd
|
||||
# define VPCMPEQ vpcmpeqd
|
||||
# define CHAR_SIZE 4
|
||||
# else
|
||||
# define VPBROADCAST vpbroadcastb
|
||||
# define VPCMP vpcmpb
|
||||
# define SHIFT_REG ecx
|
||||
# define VPMINU vpminub
|
||||
# define VPCMP vpcmpb
|
||||
# define VPCMPEQ vpcmpeqb
|
||||
# define CHAR_SIZE 1
|
||||
# endif
|
||||
|
||||
# ifdef USE_AS_RAWMEMCHR
|
||||
# define RAW_PTR_REG rcx
|
||||
# define ALGN_PTR_REG rdi
|
||||
# else
|
||||
# define RAW_PTR_REG rdi
|
||||
# define ALGN_PTR_REG rcx
|
||||
# endif
|
||||
|
||||
# define XMMZERO xmm23
|
||||
# define YMMZERO ymm23
|
||||
# define XMMMATCH xmm16
|
||||
# define YMMMATCH ymm16
|
||||
# define YMM1 ymm17
|
||||
@ -44,6 +58,8 @@
|
||||
# define YMM6 ymm22
|
||||
|
||||
# define VEC_SIZE 32
|
||||
# define CHAR_PER_VEC (VEC_SIZE / CHAR_SIZE)
|
||||
# define PAGE_SIZE 4096
|
||||
|
||||
.section .text.evex,"ax",@progbits
|
||||
ENTRY (MEMCHR)
|
||||
@ -51,11 +67,7 @@ ENTRY (MEMCHR)
|
||||
/* Check for zero length. */
|
||||
test %RDX_LP, %RDX_LP
|
||||
jz L(zero)
|
||||
# endif
|
||||
movl %edi, %ecx
|
||||
# ifdef USE_AS_WMEMCHR
|
||||
shl $2, %RDX_LP
|
||||
# else
|
||||
|
||||
# ifdef __ILP32__
|
||||
/* Clear the upper 32 bits. */
|
||||
movl %edx, %edx
|
||||
@ -64,318 +76,403 @@ ENTRY (MEMCHR)
|
||||
/* Broadcast CHAR to YMMMATCH. */
|
||||
VPBROADCAST %esi, %YMMMATCH
|
||||
/* Check if we may cross page boundary with one vector load. */
|
||||
andl $(2 * VEC_SIZE - 1), %ecx
|
||||
cmpl $VEC_SIZE, %ecx
|
||||
ja L(cros_page_boundary)
|
||||
movl %edi, %eax
|
||||
andl $(PAGE_SIZE - 1), %eax
|
||||
cmpl $(PAGE_SIZE - VEC_SIZE), %eax
|
||||
ja L(cross_page_boundary)
|
||||
|
||||
/* Check the first VEC_SIZE bytes. */
|
||||
VPCMP $0, (%rdi), %YMMMATCH, %k1
|
||||
kmovd %k1, %eax
|
||||
testl %eax, %eax
|
||||
|
||||
VPCMP $0, (%rdi), %YMMMATCH, %k0
|
||||
kmovd %k0, %eax
|
||||
# ifndef USE_AS_RAWMEMCHR
|
||||
jnz L(first_vec_x0_check)
|
||||
/* Adjust length and check the end of data. */
|
||||
subq $VEC_SIZE, %rdx
|
||||
jbe L(zero)
|
||||
# else
|
||||
jnz L(first_vec_x0)
|
||||
/* If length < CHAR_PER_VEC handle special. */
|
||||
cmpq $CHAR_PER_VEC, %rdx
|
||||
jbe L(first_vec_x0)
|
||||
# endif
|
||||
|
||||
/* Align data for aligned loads in the loop. */
|
||||
addq $VEC_SIZE, %rdi
|
||||
andl $(VEC_SIZE - 1), %ecx
|
||||
andq $-VEC_SIZE, %rdi
|
||||
|
||||
# ifndef USE_AS_RAWMEMCHR
|
||||
/* Adjust length. */
|
||||
addq %rcx, %rdx
|
||||
|
||||
subq $(VEC_SIZE * 4), %rdx
|
||||
jbe L(last_4x_vec_or_less)
|
||||
# endif
|
||||
jmp L(more_4x_vec)
|
||||
|
||||
.p2align 4
|
||||
L(cros_page_boundary):
|
||||
andl $(VEC_SIZE - 1), %ecx
|
||||
# ifdef USE_AS_WMEMCHR
|
||||
/* NB: Divide shift count by 4 since each bit in K1 represent 4
|
||||
bytes. */
|
||||
movl %ecx, %SHIFT_REG
|
||||
sarl $2, %SHIFT_REG
|
||||
# endif
|
||||
andq $-VEC_SIZE, %rdi
|
||||
VPCMP $0, (%rdi), %YMMMATCH, %k1
|
||||
kmovd %k1, %eax
|
||||
/* Remove the leading bytes. */
|
||||
sarxl %SHIFT_REG, %eax, %eax
|
||||
testl %eax, %eax
|
||||
jz L(aligned_more)
|
||||
tzcntl %eax, %eax
|
||||
# ifdef USE_AS_WMEMCHR
|
||||
/* NB: Multiply wchar_t count by 4 to get the number of bytes. */
|
||||
sall $2, %eax
|
||||
# endif
|
||||
# ifndef USE_AS_RAWMEMCHR
|
||||
/* Check the end of data. */
|
||||
cmpq %rax, %rdx
|
||||
jbe L(zero)
|
||||
# endif
|
||||
addq %rdi, %rax
|
||||
addq %rcx, %rax
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(aligned_more):
|
||||
# ifndef USE_AS_RAWMEMCHR
|
||||
/* Calculate "rdx + rcx - VEC_SIZE" with "rdx - (VEC_SIZE - rcx)"
|
||||
instead of "(rdx + rcx) - VEC_SIZE" to void possible addition
|
||||
overflow. */
|
||||
negq %rcx
|
||||
addq $VEC_SIZE, %rcx
|
||||
|
||||
/* Check the end of data. */
|
||||
subq %rcx, %rdx
|
||||
jbe L(zero)
|
||||
# endif
|
||||
|
||||
addq $VEC_SIZE, %rdi
|
||||
|
||||
# ifndef USE_AS_RAWMEMCHR
|
||||
subq $(VEC_SIZE * 4), %rdx
|
||||
jbe L(last_4x_vec_or_less)
|
||||
# endif
|
||||
|
||||
L(more_4x_vec):
|
||||
/* Check the first 4 * VEC_SIZE. Only one VEC_SIZE at a time
|
||||
since data is only aligned to VEC_SIZE. */
|
||||
VPCMP $0, (%rdi), %YMMMATCH, %k1
|
||||
kmovd %k1, %eax
|
||||
testl %eax, %eax
|
||||
jnz L(first_vec_x0)
|
||||
|
||||
VPCMP $0, VEC_SIZE(%rdi), %YMMMATCH, %k1
|
||||
kmovd %k1, %eax
|
||||
testl %eax, %eax
|
||||
jnz L(first_vec_x1)
|
||||
|
||||
VPCMP $0, (VEC_SIZE * 2)(%rdi), %YMMMATCH, %k1
|
||||
kmovd %k1, %eax
|
||||
testl %eax, %eax
|
||||
jnz L(first_vec_x2)
|
||||
|
||||
VPCMP $0, (VEC_SIZE * 3)(%rdi), %YMMMATCH, %k1
|
||||
kmovd %k1, %eax
|
||||
testl %eax, %eax
|
||||
jnz L(first_vec_x3)
|
||||
|
||||
addq $(VEC_SIZE * 4), %rdi
|
||||
|
||||
# ifndef USE_AS_RAWMEMCHR
|
||||
subq $(VEC_SIZE * 4), %rdx
|
||||
jbe L(last_4x_vec_or_less)
|
||||
# endif
|
||||
|
||||
/* Align data to 4 * VEC_SIZE. */
|
||||
movq %rdi, %rcx
|
||||
andl $(4 * VEC_SIZE - 1), %ecx
|
||||
andq $-(4 * VEC_SIZE), %rdi
|
||||
|
||||
# ifndef USE_AS_RAWMEMCHR
|
||||
/* Adjust length. */
|
||||
addq %rcx, %rdx
|
||||
# endif
|
||||
|
||||
.p2align 4
|
||||
L(loop_4x_vec):
|
||||
/* Compare 4 * VEC at a time forward. */
|
||||
VPCMP $0, (%rdi), %YMMMATCH, %k1
|
||||
VPCMP $0, VEC_SIZE(%rdi), %YMMMATCH, %k2
|
||||
kord %k1, %k2, %k5
|
||||
VPCMP $0, (VEC_SIZE * 2)(%rdi), %YMMMATCH, %k3
|
||||
VPCMP $0, (VEC_SIZE * 3)(%rdi), %YMMMATCH, %k4
|
||||
|
||||
kord %k3, %k4, %k6
|
||||
kortestd %k5, %k6
|
||||
jnz L(4x_vec_end)
|
||||
|
||||
addq $(VEC_SIZE * 4), %rdi
|
||||
|
||||
# ifdef USE_AS_RAWMEMCHR
|
||||
jmp L(loop_4x_vec)
|
||||
/* NB: Multiply bytes by CHAR_SIZE to get the wchar_t count. */
|
||||
leaq (%rdi, %rax, CHAR_SIZE), %rax
|
||||
# else
|
||||
subq $(VEC_SIZE * 4), %rdx
|
||||
ja L(loop_4x_vec)
|
||||
|
||||
L(last_4x_vec_or_less):
|
||||
/* Less than 4 * VEC and aligned to VEC_SIZE. */
|
||||
addl $(VEC_SIZE * 2), %edx
|
||||
jle L(last_2x_vec)
|
||||
|
||||
VPCMP $0, (%rdi), %YMMMATCH, %k1
|
||||
kmovd %k1, %eax
|
||||
testl %eax, %eax
|
||||
jnz L(first_vec_x0)
|
||||
|
||||
VPCMP $0, VEC_SIZE(%rdi), %YMMMATCH, %k1
|
||||
kmovd %k1, %eax
|
||||
testl %eax, %eax
|
||||
jnz L(first_vec_x1)
|
||||
|
||||
VPCMP $0, (VEC_SIZE * 2)(%rdi), %YMMMATCH, %k1
|
||||
kmovd %k1, %eax
|
||||
testl %eax, %eax
|
||||
|
||||
jnz L(first_vec_x2_check)
|
||||
subl $VEC_SIZE, %edx
|
||||
jle L(zero)
|
||||
|
||||
VPCMP $0, (VEC_SIZE * 3)(%rdi), %YMMMATCH, %k1
|
||||
kmovd %k1, %eax
|
||||
testl %eax, %eax
|
||||
|
||||
jnz L(first_vec_x3_check)
|
||||
xorl %eax, %eax
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(last_2x_vec):
|
||||
addl $(VEC_SIZE * 2), %edx
|
||||
VPCMP $0, (%rdi), %YMMMATCH, %k1
|
||||
kmovd %k1, %eax
|
||||
testl %eax, %eax
|
||||
|
||||
jnz L(first_vec_x0_check)
|
||||
subl $VEC_SIZE, %edx
|
||||
jle L(zero)
|
||||
|
||||
VPCMP $0, VEC_SIZE(%rdi), %YMMMATCH, %k1
|
||||
kmovd %k1, %eax
|
||||
testl %eax, %eax
|
||||
jnz L(first_vec_x1_check)
|
||||
xorl %eax, %eax
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(first_vec_x0_check):
|
||||
tzcntl %eax, %eax
|
||||
# ifdef USE_AS_WMEMCHR
|
||||
/* NB: Multiply wchar_t count by 4 to get the number of bytes. */
|
||||
sall $2, %eax
|
||||
# endif
|
||||
/* Check the end of data. */
|
||||
cmpq %rax, %rdx
|
||||
jbe L(zero)
|
||||
addq %rdi, %rax
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(first_vec_x1_check):
|
||||
tzcntl %eax, %eax
|
||||
# ifdef USE_AS_WMEMCHR
|
||||
/* NB: Multiply wchar_t count by 4 to get the number of bytes. */
|
||||
sall $2, %eax
|
||||
# endif
|
||||
/* Check the end of data. */
|
||||
cmpq %rax, %rdx
|
||||
jbe L(zero)
|
||||
addq $VEC_SIZE, %rax
|
||||
addq %rdi, %rax
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(first_vec_x2_check):
|
||||
tzcntl %eax, %eax
|
||||
# ifdef USE_AS_WMEMCHR
|
||||
/* NB: Multiply wchar_t count by 4 to get the number of bytes. */
|
||||
sall $2, %eax
|
||||
# endif
|
||||
/* Check the end of data. */
|
||||
cmpq %rax, %rdx
|
||||
jbe L(zero)
|
||||
addq $(VEC_SIZE * 2), %rax
|
||||
addq %rdi, %rax
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(first_vec_x3_check):
|
||||
tzcntl %eax, %eax
|
||||
# ifdef USE_AS_WMEMCHR
|
||||
/* NB: Multiply wchar_t count by 4 to get the number of bytes. */
|
||||
sall $2, %eax
|
||||
# endif
|
||||
/* Check the end of data. */
|
||||
cmpq %rax, %rdx
|
||||
jbe L(zero)
|
||||
addq $(VEC_SIZE * 3), %rax
|
||||
addq %rdi, %rax
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
# ifndef USE_AS_RAWMEMCHR
|
||||
L(zero):
|
||||
xorl %eax, %eax
|
||||
ret
|
||||
# endif
|
||||
|
||||
.p2align 4
|
||||
.p2align 5
|
||||
L(first_vec_x0):
|
||||
/* Check if first match was before length. */
|
||||
tzcntl %eax, %eax
|
||||
xorl %ecx, %ecx
|
||||
cmpl %eax, %edx
|
||||
leaq (%rdi, %rax, CHAR_SIZE), %rax
|
||||
cmovle %rcx, %rax
|
||||
ret
|
||||
# else
|
||||
/* NB: first_vec_x0 is 17 bytes which will leave
|
||||
cross_page_boundary (which is relatively cold) close enough
|
||||
to ideal alignment. So only realign L(cross_page_boundary) if
|
||||
rawmemchr. */
|
||||
.p2align 4
|
||||
# endif
|
||||
L(cross_page_boundary):
|
||||
/* Save pointer before aligning as its original value is
|
||||
necessary for computer return address if byte is found or
|
||||
adjusting length if it is not and this is memchr. */
|
||||
movq %rdi, %rcx
|
||||
/* Align data to VEC_SIZE. ALGN_PTR_REG is rcx for memchr and rdi
|
||||
for rawmemchr. */
|
||||
andq $-VEC_SIZE, %ALGN_PTR_REG
|
||||
VPCMP $0, (%ALGN_PTR_REG), %YMMMATCH, %k0
|
||||
kmovd %k0, %r8d
|
||||
# ifdef USE_AS_WMEMCHR
|
||||
/* NB: Divide shift count by 4 since each bit in K0 represent 4
|
||||
bytes. */
|
||||
sarl $2, %eax
|
||||
# endif
|
||||
# ifndef USE_AS_RAWMEMCHR
|
||||
movl $(PAGE_SIZE / CHAR_SIZE), %esi
|
||||
subl %eax, %esi
|
||||
# endif
|
||||
# ifdef USE_AS_WMEMCHR
|
||||
andl $(CHAR_PER_VEC - 1), %eax
|
||||
# endif
|
||||
/* Remove the leading bytes. */
|
||||
sarxl %eax, %r8d, %eax
|
||||
# ifndef USE_AS_RAWMEMCHR
|
||||
/* Check the end of data. */
|
||||
cmpq %rsi, %rdx
|
||||
jbe L(first_vec_x0)
|
||||
# endif
|
||||
testl %eax, %eax
|
||||
jz L(cross_page_continue)
|
||||
tzcntl %eax, %eax
|
||||
# ifdef USE_AS_WMEMCHR
|
||||
/* NB: Multiply wchar_t count by 4 to get the number of bytes. */
|
||||
leaq (%rdi, %rax, 4), %rax
|
||||
/* NB: Multiply bytes by CHAR_SIZE to get the wchar_t count. */
|
||||
leaq (%RAW_PTR_REG, %rax, CHAR_SIZE), %rax
|
||||
# else
|
||||
addq %rdi, %rax
|
||||
addq %RAW_PTR_REG, %rax
|
||||
# endif
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(first_vec_x1):
|
||||
tzcntl %eax, %eax
|
||||
# ifdef USE_AS_WMEMCHR
|
||||
/* NB: Multiply wchar_t count by 4 to get the number of bytes. */
|
||||
leaq VEC_SIZE(%rdi, %rax, 4), %rax
|
||||
# else
|
||||
addq $VEC_SIZE, %rax
|
||||
addq %rdi, %rax
|
||||
# endif
|
||||
leaq VEC_SIZE(%rdi, %rax, CHAR_SIZE), %rax
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(first_vec_x2):
|
||||
tzcntl %eax, %eax
|
||||
# ifdef USE_AS_WMEMCHR
|
||||
/* NB: Multiply wchar_t count by 4 to get the number of bytes. */
|
||||
leaq (VEC_SIZE * 2)(%rdi, %rax, 4), %rax
|
||||
leaq (VEC_SIZE * 2)(%rdi, %rax, CHAR_SIZE), %rax
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(first_vec_x3):
|
||||
tzcntl %eax, %eax
|
||||
leaq (VEC_SIZE * 3)(%rdi, %rax, CHAR_SIZE), %rax
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(first_vec_x4):
|
||||
tzcntl %eax, %eax
|
||||
leaq (VEC_SIZE * 4)(%rdi, %rax, CHAR_SIZE), %rax
|
||||
ret
|
||||
|
||||
.p2align 5
|
||||
L(aligned_more):
|
||||
/* Check the first 4 * VEC_SIZE. Only one VEC_SIZE at a time
|
||||
since data is only aligned to VEC_SIZE. */
|
||||
|
||||
# ifndef USE_AS_RAWMEMCHR
|
||||
/* Align data to VEC_SIZE. */
|
||||
L(cross_page_continue):
|
||||
xorl %ecx, %ecx
|
||||
subl %edi, %ecx
|
||||
andq $-VEC_SIZE, %rdi
|
||||
/* esi is for adjusting length to see if near the end. */
|
||||
leal (VEC_SIZE * 5)(%rdi, %rcx), %esi
|
||||
# ifdef USE_AS_WMEMCHR
|
||||
/* NB: Divide bytes by 4 to get the wchar_t count. */
|
||||
sarl $2, %esi
|
||||
# endif
|
||||
# else
|
||||
addq $(VEC_SIZE * 2), %rax
|
||||
addq %rdi, %rax
|
||||
andq $-VEC_SIZE, %rdi
|
||||
L(cross_page_continue):
|
||||
# endif
|
||||
/* Load first VEC regardless. */
|
||||
VPCMP $0, (VEC_SIZE)(%rdi), %YMMMATCH, %k0
|
||||
kmovd %k0, %eax
|
||||
# ifndef USE_AS_RAWMEMCHR
|
||||
/* Adjust length. If near end handle specially. */
|
||||
subq %rsi, %rdx
|
||||
jbe L(last_4x_vec_or_less)
|
||||
# endif
|
||||
testl %eax, %eax
|
||||
jnz L(first_vec_x1)
|
||||
|
||||
VPCMP $0, (VEC_SIZE * 2)(%rdi), %YMMMATCH, %k0
|
||||
kmovd %k0, %eax
|
||||
testl %eax, %eax
|
||||
jnz L(first_vec_x2)
|
||||
|
||||
VPCMP $0, (VEC_SIZE * 3)(%rdi), %YMMMATCH, %k0
|
||||
kmovd %k0, %eax
|
||||
testl %eax, %eax
|
||||
jnz L(first_vec_x3)
|
||||
|
||||
VPCMP $0, (VEC_SIZE * 4)(%rdi), %YMMMATCH, %k0
|
||||
kmovd %k0, %eax
|
||||
testl %eax, %eax
|
||||
jnz L(first_vec_x4)
|
||||
|
||||
|
||||
# ifndef USE_AS_RAWMEMCHR
|
||||
/* Check if at last CHAR_PER_VEC * 4 length. */
|
||||
subq $(CHAR_PER_VEC * 4), %rdx
|
||||
jbe L(last_4x_vec_or_less_cmpeq)
|
||||
addq $VEC_SIZE, %rdi
|
||||
|
||||
/* Align data to VEC_SIZE * 4 for the loop and readjust length.
|
||||
*/
|
||||
# ifdef USE_AS_WMEMCHR
|
||||
movl %edi, %ecx
|
||||
andq $-(4 * VEC_SIZE), %rdi
|
||||
andl $(VEC_SIZE * 4 - 1), %ecx
|
||||
/* NB: Divide bytes by 4 to get the wchar_t count. */
|
||||
sarl $2, %ecx
|
||||
addq %rcx, %rdx
|
||||
# else
|
||||
addq %rdi, %rdx
|
||||
andq $-(4 * VEC_SIZE), %rdi
|
||||
subq %rdi, %rdx
|
||||
# endif
|
||||
# else
|
||||
addq $VEC_SIZE, %rdi
|
||||
andq $-(4 * VEC_SIZE), %rdi
|
||||
# endif
|
||||
|
||||
vpxorq %XMMZERO, %XMMZERO, %XMMZERO
|
||||
|
||||
/* Compare 4 * VEC at a time forward. */
|
||||
.p2align 4
|
||||
L(loop_4x_vec):
|
||||
/* It would be possible to save some instructions using 4x VPCMP
|
||||
but bottleneck on port 5 makes it not woth it. */
|
||||
VPCMP $4, (VEC_SIZE * 4)(%rdi), %YMMMATCH, %k1
|
||||
/* xor will set bytes match esi to zero. */
|
||||
vpxorq (VEC_SIZE * 5)(%rdi), %YMMMATCH, %YMM2
|
||||
vpxorq (VEC_SIZE * 6)(%rdi), %YMMMATCH, %YMM3
|
||||
VPCMP $0, (VEC_SIZE * 7)(%rdi), %YMMMATCH, %k3
|
||||
/* Reduce VEC2 / VEC3 with min and VEC1 with zero mask. */
|
||||
VPMINU %YMM2, %YMM3, %YMM3 {%k1} {z}
|
||||
VPCMP $0, %YMM3, %YMMZERO, %k2
|
||||
# ifdef USE_AS_RAWMEMCHR
|
||||
subq $-(VEC_SIZE * 4), %rdi
|
||||
kortestd %k2, %k3
|
||||
jz L(loop_4x_vec)
|
||||
# else
|
||||
kortestd %k2, %k3
|
||||
jnz L(loop_4x_vec_end)
|
||||
|
||||
subq $-(VEC_SIZE * 4), %rdi
|
||||
|
||||
subq $(CHAR_PER_VEC * 4), %rdx
|
||||
ja L(loop_4x_vec)
|
||||
|
||||
/* Fall through into less than 4 remaining vectors of length case.
|
||||
*/
|
||||
VPCMP $0, (VEC_SIZE * 4)(%rdi), %YMMMATCH, %k0
|
||||
kmovd %k0, %eax
|
||||
addq $(VEC_SIZE * 3), %rdi
|
||||
.p2align 4
|
||||
L(last_4x_vec_or_less):
|
||||
/* Check if first VEC contained match. */
|
||||
testl %eax, %eax
|
||||
jnz L(first_vec_x1_check)
|
||||
|
||||
/* If remaining length > CHAR_PER_VEC * 2. */
|
||||
addl $(CHAR_PER_VEC * 2), %edx
|
||||
jg L(last_4x_vec)
|
||||
|
||||
L(last_2x_vec):
|
||||
/* If remaining length < CHAR_PER_VEC. */
|
||||
addl $CHAR_PER_VEC, %edx
|
||||
jle L(zero_end)
|
||||
|
||||
/* Check VEC2 and compare any match with remaining length. */
|
||||
VPCMP $0, (VEC_SIZE * 2)(%rdi), %YMMMATCH, %k0
|
||||
kmovd %k0, %eax
|
||||
tzcntl %eax, %eax
|
||||
cmpl %eax, %edx
|
||||
jbe L(set_zero_end)
|
||||
leaq (VEC_SIZE * 2)(%rdi, %rax, CHAR_SIZE), %rax
|
||||
L(zero_end):
|
||||
ret
|
||||
|
||||
|
||||
.p2align 4
|
||||
L(first_vec_x1_check):
|
||||
tzcntl %eax, %eax
|
||||
/* Adjust length. */
|
||||
subl $-(CHAR_PER_VEC * 4), %edx
|
||||
/* Check if match within remaining length. */
|
||||
cmpl %eax, %edx
|
||||
jbe L(set_zero_end)
|
||||
/* NB: Multiply bytes by CHAR_SIZE to get the wchar_t count. */
|
||||
leaq VEC_SIZE(%rdi, %rax, CHAR_SIZE), %rax
|
||||
ret
|
||||
L(set_zero_end):
|
||||
xorl %eax, %eax
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(loop_4x_vec_end):
|
||||
# endif
|
||||
/* rawmemchr will fall through into this if match was found in
|
||||
loop. */
|
||||
|
||||
/* k1 has not of matches with VEC1. */
|
||||
kmovd %k1, %eax
|
||||
# ifdef USE_AS_WMEMCHR
|
||||
subl $((1 << CHAR_PER_VEC) - 1), %eax
|
||||
# else
|
||||
incl %eax
|
||||
# endif
|
||||
jnz L(last_vec_x1_return)
|
||||
|
||||
VPCMP $0, %YMM2, %YMMZERO, %k0
|
||||
kmovd %k0, %eax
|
||||
testl %eax, %eax
|
||||
jnz L(last_vec_x2_return)
|
||||
|
||||
kmovd %k2, %eax
|
||||
testl %eax, %eax
|
||||
jnz L(last_vec_x3_return)
|
||||
|
||||
kmovd %k3, %eax
|
||||
tzcntl %eax, %eax
|
||||
# ifdef USE_AS_RAWMEMCHR
|
||||
leaq (VEC_SIZE * 3)(%rdi, %rax, CHAR_SIZE), %rax
|
||||
# else
|
||||
leaq (VEC_SIZE * 7)(%rdi, %rax, CHAR_SIZE), %rax
|
||||
# endif
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(4x_vec_end):
|
||||
kmovd %k1, %eax
|
||||
testl %eax, %eax
|
||||
jnz L(first_vec_x0)
|
||||
kmovd %k2, %eax
|
||||
testl %eax, %eax
|
||||
jnz L(first_vec_x1)
|
||||
kmovd %k3, %eax
|
||||
testl %eax, %eax
|
||||
jnz L(first_vec_x2)
|
||||
kmovd %k4, %eax
|
||||
testl %eax, %eax
|
||||
L(first_vec_x3):
|
||||
L(last_vec_x1_return):
|
||||
tzcntl %eax, %eax
|
||||
# ifdef USE_AS_WMEMCHR
|
||||
/* NB: Multiply wchar_t count by 4 to get the number of bytes. */
|
||||
leaq (VEC_SIZE * 3)(%rdi, %rax, 4), %rax
|
||||
# else
|
||||
addq $(VEC_SIZE * 3), %rax
|
||||
# ifdef USE_AS_RAWMEMCHR
|
||||
# ifdef USE_AS_WMEMCHR
|
||||
/* NB: Multiply bytes by CHAR_SIZE to get the wchar_t count. */
|
||||
leaq (%rdi, %rax, CHAR_SIZE), %rax
|
||||
# else
|
||||
addq %rdi, %rax
|
||||
# endif
|
||||
# else
|
||||
/* NB: Multiply bytes by CHAR_SIZE to get the wchar_t count. */
|
||||
leaq (VEC_SIZE * 4)(%rdi, %rax, CHAR_SIZE), %rax
|
||||
# endif
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(last_vec_x2_return):
|
||||
tzcntl %eax, %eax
|
||||
# ifdef USE_AS_RAWMEMCHR
|
||||
/* NB: Multiply bytes by CHAR_SIZE to get the wchar_t count. */
|
||||
leaq VEC_SIZE(%rdi, %rax, CHAR_SIZE), %rax
|
||||
# else
|
||||
/* NB: Multiply bytes by CHAR_SIZE to get the wchar_t count. */
|
||||
leaq (VEC_SIZE * 5)(%rdi, %rax, CHAR_SIZE), %rax
|
||||
# endif
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(last_vec_x3_return):
|
||||
tzcntl %eax, %eax
|
||||
# ifdef USE_AS_RAWMEMCHR
|
||||
/* NB: Multiply bytes by CHAR_SIZE to get the wchar_t count. */
|
||||
leaq (VEC_SIZE * 2)(%rdi, %rax, CHAR_SIZE), %rax
|
||||
# else
|
||||
/* NB: Multiply bytes by CHAR_SIZE to get the wchar_t count. */
|
||||
leaq (VEC_SIZE * 6)(%rdi, %rax, CHAR_SIZE), %rax
|
||||
# endif
|
||||
ret
|
||||
|
||||
|
||||
# ifndef USE_AS_RAWMEMCHR
|
||||
L(last_4x_vec_or_less_cmpeq):
|
||||
VPCMP $0, (VEC_SIZE * 5)(%rdi), %YMMMATCH, %k0
|
||||
kmovd %k0, %eax
|
||||
subq $-(VEC_SIZE * 4), %rdi
|
||||
/* Check first VEC regardless. */
|
||||
testl %eax, %eax
|
||||
jnz L(first_vec_x1_check)
|
||||
|
||||
/* If remaining length <= CHAR_PER_VEC * 2. */
|
||||
addl $(CHAR_PER_VEC * 2), %edx
|
||||
jle L(last_2x_vec)
|
||||
|
||||
.p2align 4
|
||||
L(last_4x_vec):
|
||||
VPCMP $0, (VEC_SIZE * 2)(%rdi), %YMMMATCH, %k0
|
||||
kmovd %k0, %eax
|
||||
testl %eax, %eax
|
||||
jnz L(last_vec_x2)
|
||||
|
||||
|
||||
VPCMP $0, (VEC_SIZE * 3)(%rdi), %YMMMATCH, %k0
|
||||
kmovd %k0, %eax
|
||||
/* Create mask for possible matches within remaining length. */
|
||||
# ifdef USE_AS_WMEMCHR
|
||||
movl $((1 << (CHAR_PER_VEC * 2)) - 1), %ecx
|
||||
bzhil %edx, %ecx, %ecx
|
||||
# else
|
||||
movq $-1, %rcx
|
||||
bzhiq %rdx, %rcx, %rcx
|
||||
# endif
|
||||
/* Test matches in data against length match. */
|
||||
andl %ecx, %eax
|
||||
jnz L(last_vec_x3)
|
||||
|
||||
/* if remaining length <= CHAR_PER_VEC * 3 (Note this is after
|
||||
remaining length was found to be > CHAR_PER_VEC * 2. */
|
||||
subl $CHAR_PER_VEC, %edx
|
||||
jbe L(zero_end2)
|
||||
|
||||
|
||||
VPCMP $0, (VEC_SIZE * 4)(%rdi), %YMMMATCH, %k0
|
||||
kmovd %k0, %eax
|
||||
/* Shift remaining length mask for last VEC. */
|
||||
# ifdef USE_AS_WMEMCHR
|
||||
shrl $CHAR_PER_VEC, %ecx
|
||||
# else
|
||||
shrq $CHAR_PER_VEC, %rcx
|
||||
# endif
|
||||
andl %ecx, %eax
|
||||
jz L(zero_end2)
|
||||
tzcntl %eax, %eax
|
||||
leaq (VEC_SIZE * 4)(%rdi, %rax, CHAR_SIZE), %rax
|
||||
L(zero_end2):
|
||||
ret
|
||||
|
||||
L(last_vec_x2):
|
||||
tzcntl %eax, %eax
|
||||
leaq (VEC_SIZE * 2)(%rdi, %rax, CHAR_SIZE), %rax
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(last_vec_x3):
|
||||
tzcntl %eax, %eax
|
||||
leaq (VEC_SIZE * 3)(%rdi, %rax, CHAR_SIZE), %rax
|
||||
ret
|
||||
# endif
|
||||
|
||||
END (MEMCHR)
|
||||
#endif
|
||||
|
||||
Loading…
Reference in New Issue
Block a user