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ceabdcd130
1. Add default ISA level selection in non-multiarch/rtld
implementations.
2. Add ISA level build guards to different implementations.
- I.e strcmp-avx2.S which is ISA level 3 will only build if
compiled ISA level <= 3. Otherwise there is no reason to
include it as we will always use one of the ISA level 4
implementations (strcmp-evex.S).
3. Refactor the ifunc selector and ifunc implementation list to use
the ISA level aware wrapper macros that allow functions below the
compiled ISA level (with a guranteed replacement) to be skipped.
Tested with and without multiarch on x86_64 for ISA levels:
{generic, x86-64-v2, x86-64-v3, x86-64-v4}
And m32 with and without multiarch.
284 lines
4.5 KiB
ArmAsm
284 lines
4.5 KiB
ArmAsm
/* strchr with SSE2 without bsf
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Copyright (C) 2011-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <isa-level.h>
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/* NB: atom builds with ISA level == 1 so no reason to hold onto this
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at ISA level >= 2. */
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#if ISA_SHOULD_BUILD (1)
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# include <sysdep.h>
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# include "asm-syntax.h"
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atom_text_section
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ENTRY (__strchr_sse2_no_bsf)
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movd %esi, %xmm1
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movq %rdi, %rcx
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punpcklbw %xmm1, %xmm1
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andq $~15, %rdi
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pxor %xmm2, %xmm2
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punpcklbw %xmm1, %xmm1
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orl $0xffffffff, %esi
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movdqa (%rdi), %xmm0
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pshufd $0, %xmm1, %xmm1
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subq %rdi, %rcx
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movdqa %xmm0, %xmm3
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leaq 16(%rdi), %rdi
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pcmpeqb %xmm1, %xmm0
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pcmpeqb %xmm2, %xmm3
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shl %cl, %esi
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pmovmskb %xmm0, %eax
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pmovmskb %xmm3, %edx
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andl %esi, %eax
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andl %esi, %edx
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test %eax, %eax
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jnz L(matches)
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test %edx, %edx
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jnz L(return_null)
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L(loop):
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movdqa (%rdi), %xmm0
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leaq 16(%rdi), %rdi
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movdqa %xmm0, %xmm3
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pcmpeqb %xmm1, %xmm0
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pcmpeqb %xmm2, %xmm3
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pmovmskb %xmm0, %eax
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pmovmskb %xmm3, %edx
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or %eax, %edx
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jz L(loop)
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pmovmskb %xmm3, %edx
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test %eax, %eax
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jnz L(matches)
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/* Return NULL. */
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.p2align 4
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L(return_null):
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xor %rax, %rax
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ret
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L(matches):
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/* There is a match. First find where NULL is. */
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leaq -16(%rdi), %rdi
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test %edx, %edx
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jz L(match_case1)
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.p2align 4
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L(match_case2):
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test %al, %al
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jz L(match_high_case2)
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mov %al, %cl
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and $15, %cl
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jnz L(match_case2_4)
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mov %dl, %ch
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and $15, %ch
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jnz L(return_null)
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test $0x10, %al
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jnz L(Exit5)
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test $0x10, %dl
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jnz L(return_null)
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test $0x20, %al
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jnz L(Exit6)
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test $0x20, %dl
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jnz L(return_null)
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test $0x40, %al
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jnz L(Exit7)
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test $0x40, %dl
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jnz L(return_null)
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lea 7(%rdi), %rax
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ret
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.p2align 4
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L(match_case2_4):
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test $0x01, %al
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jnz L(Exit1)
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test $0x01, %dl
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jnz L(return_null)
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test $0x02, %al
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jnz L(Exit2)
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test $0x02, %dl
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jnz L(return_null)
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test $0x04, %al
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jnz L(Exit3)
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test $0x04, %dl
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jnz L(return_null)
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lea 3(%rdi), %rax
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ret
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.p2align 4
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L(match_high_case2):
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test %dl, %dl
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jnz L(return_null)
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mov %ah, %cl
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and $15, %cl
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jnz L(match_case2_12)
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mov %dh, %ch
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and $15, %ch
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jnz L(return_null)
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test $0x10, %ah
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jnz L(Exit13)
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test $0x10, %dh
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jnz L(return_null)
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test $0x20, %ah
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jnz L(Exit14)
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test $0x20, %dh
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jnz L(return_null)
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test $0x40, %ah
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jnz L(Exit15)
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test $0x40, %dh
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jnz L(return_null)
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lea 15(%rdi), %rax
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ret
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.p2align 4
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L(match_case2_12):
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test $0x01, %ah
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jnz L(Exit9)
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test $0x01, %dh
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jnz L(return_null)
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test $0x02, %ah
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jnz L(Exit10)
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test $0x02, %dh
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jnz L(return_null)
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test $0x04, %ah
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jnz L(Exit11)
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test $0x04, %dh
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jnz L(return_null)
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lea 11(%rdi), %rax
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ret
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.p2align 4
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L(match_case1):
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test %al, %al
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jz L(match_high_case1)
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test $0x01, %al
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jnz L(Exit1)
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test $0x02, %al
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jnz L(Exit2)
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test $0x04, %al
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jnz L(Exit3)
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test $0x08, %al
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jnz L(Exit4)
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test $0x10, %al
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jnz L(Exit5)
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test $0x20, %al
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jnz L(Exit6)
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test $0x40, %al
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jnz L(Exit7)
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lea 7(%rdi), %rax
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ret
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.p2align 4
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L(match_high_case1):
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test $0x01, %ah
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jnz L(Exit9)
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test $0x02, %ah
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jnz L(Exit10)
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test $0x04, %ah
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jnz L(Exit11)
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test $0x08, %ah
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jnz L(Exit12)
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test $0x10, %ah
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jnz L(Exit13)
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test $0x20, %ah
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jnz L(Exit14)
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test $0x40, %ah
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jnz L(Exit15)
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lea 15(%rdi), %rax
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ret
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.p2align 4
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L(Exit1):
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lea (%rdi), %rax
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ret
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.p2align 4
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L(Exit2):
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lea 1(%rdi), %rax
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ret
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.p2align 4
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L(Exit3):
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lea 2(%rdi), %rax
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ret
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.p2align 4
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L(Exit4):
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lea 3(%rdi), %rax
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ret
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.p2align 4
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L(Exit5):
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lea 4(%rdi), %rax
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ret
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.p2align 4
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L(Exit6):
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lea 5(%rdi), %rax
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ret
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.p2align 4
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L(Exit7):
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lea 6(%rdi), %rax
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ret
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.p2align 4
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L(Exit9):
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lea 8(%rdi), %rax
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ret
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.p2align 4
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L(Exit10):
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lea 9(%rdi), %rax
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ret
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.p2align 4
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L(Exit11):
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lea 10(%rdi), %rax
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ret
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.p2align 4
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L(Exit12):
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lea 11(%rdi), %rax
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ret
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.p2align 4
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L(Exit13):
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lea 12(%rdi), %rax
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ret
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.p2align 4
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L(Exit14):
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lea 13(%rdi), %rax
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ret
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.p2align 4
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L(Exit15):
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lea 14(%rdi), %rax
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ret
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END (__strchr_sse2_no_bsf)
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#endif
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