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/* strchr with SSE2 without bsf
Copyright (C) 2011-2024 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/>. */
#include <isa-level.h>
/* NB: atom builds with ISA level == 1 so no reason to hold onto this
at ISA level >= 2. */
#if ISA_SHOULD_BUILD (1)
# include <sysdep.h>
# include "asm-syntax.h"
atom_text_section
ENTRY (__strchr_sse2_no_bsf)
movd %esi, %xmm1
movq %rdi, %rcx
punpcklbw %xmm1, %xmm1
andq $~15, %rdi
pxor %xmm2, %xmm2
punpcklbw %xmm1, %xmm1
orl $0xffffffff, %esi
movdqa (%rdi), %xmm0
pshufd $0, %xmm1, %xmm1
subq %rdi, %rcx
movdqa %xmm0, %xmm3
leaq 16(%rdi), %rdi
pcmpeqb %xmm1, %xmm0
pcmpeqb %xmm2, %xmm3
shl %cl, %esi
pmovmskb %xmm0, %eax
pmovmskb %xmm3, %edx
andl %esi, %eax
andl %esi, %edx
test %eax, %eax
jnz L(matches)
test %edx, %edx
jnz L(return_null)
L(loop):
movdqa (%rdi), %xmm0
leaq 16(%rdi), %rdi
movdqa %xmm0, %xmm3
pcmpeqb %xmm1, %xmm0
pcmpeqb %xmm2, %xmm3
pmovmskb %xmm0, %eax
pmovmskb %xmm3, %edx
or %eax, %edx
jz L(loop)
pmovmskb %xmm3, %edx
test %eax, %eax
jnz L(matches)
/* Return NULL. */
.p2align 4
L(return_null):
xor %rax, %rax
ret
L(matches):
/* There is a match. First find where NULL is. */
leaq -16(%rdi), %rdi
test %edx, %edx
jz L(match_case1)
.p2align 4
L(match_case2):
test %al, %al
jz L(match_high_case2)
mov %al, %cl
and $15, %cl
jnz L(match_case2_4)
mov %dl, %ch
and $15, %ch
jnz L(return_null)
test $0x10, %al
jnz L(Exit5)
test $0x10, %dl
jnz L(return_null)
test $0x20, %al
jnz L(Exit6)
test $0x20, %dl
jnz L(return_null)
test $0x40, %al
jnz L(Exit7)
test $0x40, %dl
jnz L(return_null)
lea 7(%rdi), %rax
ret
.p2align 4
L(match_case2_4):
test $0x01, %al
jnz L(Exit1)
test $0x01, %dl
jnz L(return_null)
test $0x02, %al
jnz L(Exit2)
test $0x02, %dl
jnz L(return_null)
test $0x04, %al
jnz L(Exit3)
test $0x04, %dl
jnz L(return_null)
lea 3(%rdi), %rax
ret
.p2align 4
L(match_high_case2):
test %dl, %dl
jnz L(return_null)
mov %ah, %cl
and $15, %cl
jnz L(match_case2_12)
mov %dh, %ch
and $15, %ch
jnz L(return_null)
test $0x10, %ah
jnz L(Exit13)
test $0x10, %dh
jnz L(return_null)
test $0x20, %ah
jnz L(Exit14)
test $0x20, %dh
jnz L(return_null)
test $0x40, %ah
jnz L(Exit15)
test $0x40, %dh
jnz L(return_null)
lea 15(%rdi), %rax
ret
.p2align 4
L(match_case2_12):
test $0x01, %ah
jnz L(Exit9)
test $0x01, %dh
jnz L(return_null)
test $0x02, %ah
jnz L(Exit10)
test $0x02, %dh
jnz L(return_null)
test $0x04, %ah
jnz L(Exit11)
test $0x04, %dh
jnz L(return_null)
lea 11(%rdi), %rax
ret
.p2align 4
L(match_case1):
test %al, %al
jz L(match_high_case1)
test $0x01, %al
jnz L(Exit1)
test $0x02, %al
jnz L(Exit2)
test $0x04, %al
jnz L(Exit3)
test $0x08, %al
jnz L(Exit4)
test $0x10, %al
jnz L(Exit5)
test $0x20, %al
jnz L(Exit6)
test $0x40, %al
jnz L(Exit7)
lea 7(%rdi), %rax
ret
.p2align 4
L(match_high_case1):
test $0x01, %ah
jnz L(Exit9)
test $0x02, %ah
jnz L(Exit10)
test $0x04, %ah
jnz L(Exit11)
test $0x08, %ah
jnz L(Exit12)
test $0x10, %ah
jnz L(Exit13)
test $0x20, %ah
jnz L(Exit14)
test $0x40, %ah
jnz L(Exit15)
lea 15(%rdi), %rax
ret
.p2align 4
L(Exit1):
lea (%rdi), %rax
ret
.p2align 4
L(Exit2):
lea 1(%rdi), %rax
ret
.p2align 4
L(Exit3):
lea 2(%rdi), %rax
ret
.p2align 4
L(Exit4):
lea 3(%rdi), %rax
ret
.p2align 4
L(Exit5):
lea 4(%rdi), %rax
ret
.p2align 4
L(Exit6):
lea 5(%rdi), %rax
ret
.p2align 4
L(Exit7):
lea 6(%rdi), %rax
ret
.p2align 4
L(Exit9):
lea 8(%rdi), %rax
ret
.p2align 4
L(Exit10):
lea 9(%rdi), %rax
ret
.p2align 4
L(Exit11):
lea 10(%rdi), %rax
ret
.p2align 4
L(Exit12):
lea 11(%rdi), %rax
ret
.p2align 4
L(Exit13):
lea 12(%rdi), %rax
ret
.p2align 4
L(Exit14):
lea 13(%rdi), %rax
ret
.p2align 4
L(Exit15):
lea 14(%rdi), %rax
ret
END (__strchr_sse2_no_bsf)
#endif
|
