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/* Copyright (C) 2011-2018 Free Software Foundation, Inc.
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Contributed by Intel Corporation.
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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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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#ifdef USE_AS_WMEMCHR
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# define MEMCHR wmemchr
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# define PCMPEQ pcmpeqd
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#else
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# define MEMCHR memchr
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# define PCMPEQ pcmpeqb
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#endif
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/* fast SSE2 version with using pmaxub and 64 byte loop */
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.text
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ENTRY(MEMCHR)
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movd %esi, %xmm1
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mov %edi, %ecx
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#ifdef USE_AS_WMEMCHR
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test %rdx, %rdx
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jz L(return_null)
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shl $2, %rdx
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#else
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punpcklbw %xmm1, %xmm1
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test %rdx, %rdx
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jz L(return_null)
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punpcklbw %xmm1, %xmm1
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#endif
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and $63, %ecx
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pshufd $0, %xmm1, %xmm1
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cmp $48, %ecx
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ja L(crosscache)
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movdqu (%rdi), %xmm0
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PCMPEQ %xmm1, %xmm0
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pmovmskb %xmm0, %eax
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test %eax, %eax
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jnz L(matches_1)
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sub $16, %rdx
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jbe L(return_null)
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add $16, %rdi
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and $15, %ecx
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and $-16, %rdi
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add %rcx, %rdx
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sub $64, %rdx
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jbe L(exit_loop)
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jmp L(loop_prolog)
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.p2align 4
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L(crosscache):
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and $15, %ecx
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and $-16, %rdi
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movdqa (%rdi), %xmm0
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PCMPEQ %xmm1, %xmm0
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/* Check if there is a match. */
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pmovmskb %xmm0, %eax
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/* Remove the leading bytes. */
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sar %cl, %eax
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test %eax, %eax
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je L(unaligned_no_match)
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/* Check which byte is a match. */
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bsf %eax, %eax
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sub %rax, %rdx
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jbe L(return_null)
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add %rdi, %rax
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add %rcx, %rax
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ret
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.p2align 4
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L(unaligned_no_match):
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/* "rcx" is less than 16. Calculate "rdx + rcx - 16" by using
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"rdx - (16 - rcx)" instead of "(rdx + rcx) - 16" to void
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possible addition overflow. */
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neg %rcx
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add $16, %rcx
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sub %rcx, %rdx
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jbe L(return_null)
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add $16, %rdi
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sub $64, %rdx
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jbe L(exit_loop)
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.p2align 4
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L(loop_prolog):
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movdqa (%rdi), %xmm0
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PCMPEQ %xmm1, %xmm0
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pmovmskb %xmm0, %eax
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test %eax, %eax
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jnz L(matches)
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movdqa 16(%rdi), %xmm2
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PCMPEQ %xmm1, %xmm2
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pmovmskb %xmm2, %eax
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test %eax, %eax
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jnz L(matches16)
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movdqa 32(%rdi), %xmm3
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PCMPEQ %xmm1, %xmm3
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pmovmskb %xmm3, %eax
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test %eax, %eax
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jnz L(matches32)
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movdqa 48(%rdi), %xmm4
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PCMPEQ %xmm1, %xmm4
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add $64, %rdi
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Packit |
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pmovmskb %xmm4, %eax
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test %eax, %eax
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jnz L(matches0)
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test $0x3f, %rdi
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jz L(align64_loop)
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sub $64, %rdx
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jbe L(exit_loop)
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movdqa (%rdi), %xmm0
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PCMPEQ %xmm1, %xmm0
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pmovmskb %xmm0, %eax
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test %eax, %eax
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jnz L(matches)
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movdqa 16(%rdi), %xmm2
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PCMPEQ %xmm1, %xmm2
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6c4009 |
pmovmskb %xmm2, %eax
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test %eax, %eax
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jnz L(matches16)
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movdqa 32(%rdi), %xmm3
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PCMPEQ %xmm1, %xmm3
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pmovmskb %xmm3, %eax
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test %eax, %eax
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jnz L(matches32)
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movdqa 48(%rdi), %xmm3
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PCMPEQ %xmm1, %xmm3
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pmovmskb %xmm3, %eax
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add $64, %rdi
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test %eax, %eax
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jnz L(matches0)
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mov %rdi, %rcx
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and $-64, %rdi
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and $63, %ecx
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add %rcx, %rdx
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.p2align 4
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L(align64_loop):
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sub $64, %rdx
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jbe L(exit_loop)
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movdqa (%rdi), %xmm0
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movdqa 16(%rdi), %xmm2
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movdqa 32(%rdi), %xmm3
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movdqa 48(%rdi), %xmm4
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PCMPEQ %xmm1, %xmm0
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Packit |
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PCMPEQ %xmm1, %xmm2
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Packit |
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PCMPEQ %xmm1, %xmm3
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PCMPEQ %xmm1, %xmm4
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Packit |
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pmaxub %xmm0, %xmm3
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Packit |
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pmaxub %xmm2, %xmm4
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Packit |
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pmaxub %xmm3, %xmm4
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Packit |
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pmovmskb %xmm4, %eax
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Packit |
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add $64, %rdi
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6c4009 |
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6c4009 |
test %eax, %eax
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6c4009 |
jz L(align64_loop)
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6c4009 |
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Packit |
6c4009 |
sub $64, %rdi
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Packit |
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Packit |
6c4009 |
pmovmskb %xmm0, %eax
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Packit |
6c4009 |
test %eax, %eax
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Packit |
6c4009 |
jnz L(matches)
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Packit |
6c4009 |
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Packit |
6c4009 |
pmovmskb %xmm2, %eax
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Packit |
6c4009 |
test %eax, %eax
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Packit |
6c4009 |
jnz L(matches16)
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Packit |
6c4009 |
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Packit |
6c4009 |
movdqa 32(%rdi), %xmm3
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Packit |
6c4009 |
PCMPEQ %xmm1, %xmm3
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Packit |
6c4009 |
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Packit |
6c4009 |
PCMPEQ 48(%rdi), %xmm1
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Packit |
6c4009 |
pmovmskb %xmm3, %eax
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Packit |
6c4009 |
test %eax, %eax
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Packit |
6c4009 |
jnz L(matches32)
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Packit |
6c4009 |
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Packit |
6c4009 |
pmovmskb %xmm1, %eax
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Packit |
6c4009 |
bsf %eax, %eax
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Packit |
6c4009 |
lea 48(%rdi, %rax), %rax
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Packit |
6c4009 |
ret
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6c4009 |
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Packit |
6c4009 |
.p2align 4
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Packit |
6c4009 |
L(exit_loop):
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Packit |
6c4009 |
add $32, %edx
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Packit |
6c4009 |
jle L(exit_loop_32)
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Packit |
6c4009 |
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Packit |
6c4009 |
movdqa (%rdi), %xmm0
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Packit |
6c4009 |
PCMPEQ %xmm1, %xmm0
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Packit |
6c4009 |
pmovmskb %xmm0, %eax
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Packit |
6c4009 |
test %eax, %eax
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Packit |
6c4009 |
jnz L(matches)
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Packit |
6c4009 |
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Packit |
6c4009 |
movdqa 16(%rdi), %xmm2
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Packit |
6c4009 |
PCMPEQ %xmm1, %xmm2
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Packit |
6c4009 |
pmovmskb %xmm2, %eax
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Packit |
6c4009 |
test %eax, %eax
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Packit |
6c4009 |
jnz L(matches16)
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Packit |
6c4009 |
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Packit |
6c4009 |
movdqa 32(%rdi), %xmm3
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Packit |
6c4009 |
PCMPEQ %xmm1, %xmm3
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Packit |
6c4009 |
pmovmskb %xmm3, %eax
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Packit |
6c4009 |
test %eax, %eax
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Packit |
6c4009 |
jnz L(matches32_1)
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Packit |
6c4009 |
sub $16, %edx
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Packit |
6c4009 |
jle L(return_null)
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Packit |
6c4009 |
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Packit |
6c4009 |
PCMPEQ 48(%rdi), %xmm1
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Packit |
6c4009 |
pmovmskb %xmm1, %eax
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Packit |
6c4009 |
test %eax, %eax
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Packit |
6c4009 |
jnz L(matches48_1)
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Packit |
6c4009 |
xor %eax, %eax
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Packit |
6c4009 |
ret
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Packit |
6c4009 |
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Packit |
6c4009 |
.p2align 4
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Packit |
6c4009 |
L(exit_loop_32):
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Packit |
6c4009 |
add $32, %edx
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Packit |
6c4009 |
movdqa (%rdi), %xmm0
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Packit |
6c4009 |
PCMPEQ %xmm1, %xmm0
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Packit |
6c4009 |
pmovmskb %xmm0, %eax
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Packit |
6c4009 |
test %eax, %eax
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Packit |
6c4009 |
jnz L(matches_1)
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Packit |
6c4009 |
sub $16, %edx
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Packit |
6c4009 |
jbe L(return_null)
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Packit |
6c4009 |
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Packit |
6c4009 |
PCMPEQ 16(%rdi), %xmm1
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Packit |
6c4009 |
pmovmskb %xmm1, %eax
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Packit |
6c4009 |
test %eax, %eax
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Packit |
6c4009 |
jnz L(matches16_1)
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Packit |
6c4009 |
xor %eax, %eax
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Packit |
6c4009 |
ret
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Packit |
6c4009 |
|
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Packit |
6c4009 |
.p2align 4
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Packit |
6c4009 |
L(matches0):
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Packit |
6c4009 |
bsf %eax, %eax
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Packit |
6c4009 |
lea -16(%rax, %rdi), %rax
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Packit |
6c4009 |
ret
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Packit |
6c4009 |
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Packit |
6c4009 |
.p2align 4
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Packit |
6c4009 |
L(matches):
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Packit |
6c4009 |
bsf %eax, %eax
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Packit |
6c4009 |
add %rdi, %rax
|
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Packit |
6c4009 |
ret
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|
Packit |
6c4009 |
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Packit |
6c4009 |
.p2align 4
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Packit |
6c4009 |
L(matches16):
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Packit |
6c4009 |
bsf %eax, %eax
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Packit |
6c4009 |
lea 16(%rax, %rdi), %rax
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Packit |
6c4009 |
ret
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Packit |
6c4009 |
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Packit |
6c4009 |
.p2align 4
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Packit |
6c4009 |
L(matches32):
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Packit |
6c4009 |
bsf %eax, %eax
|
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Packit |
6c4009 |
lea 32(%rax, %rdi), %rax
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Packit |
6c4009 |
ret
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Packit |
6c4009 |
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Packit |
6c4009 |
.p2align 4
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Packit |
6c4009 |
L(matches_1):
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Packit |
6c4009 |
bsf %eax, %eax
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Packit |
6c4009 |
sub %rax, %rdx
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Packit |
6c4009 |
jbe L(return_null)
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Packit |
6c4009 |
add %rdi, %rax
|
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Packit |
6c4009 |
ret
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Packit |
6c4009 |
|
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Packit |
6c4009 |
.p2align 4
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Packit |
6c4009 |
L(matches16_1):
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Packit |
6c4009 |
bsf %eax, %eax
|
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Packit |
6c4009 |
sub %rax, %rdx
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Packit |
6c4009 |
jbe L(return_null)
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Packit |
6c4009 |
lea 16(%rdi, %rax), %rax
|
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Packit |
6c4009 |
ret
|
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Packit |
6c4009 |
|
|
Packit |
6c4009 |
.p2align 4
|
|
Packit |
6c4009 |
L(matches32_1):
|
|
Packit |
6c4009 |
bsf %eax, %eax
|
|
Packit |
6c4009 |
sub %rax, %rdx
|
|
Packit |
6c4009 |
jbe L(return_null)
|
|
Packit |
6c4009 |
lea 32(%rdi, %rax), %rax
|
|
Packit |
6c4009 |
ret
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
.p2align 4
|
|
Packit |
6c4009 |
L(matches48_1):
|
|
Packit |
6c4009 |
bsf %eax, %eax
|
|
Packit |
6c4009 |
sub %rax, %rdx
|
|
Packit |
6c4009 |
jbe L(return_null)
|
|
Packit |
6c4009 |
lea 48(%rdi, %rax), %rax
|
|
Packit |
6c4009 |
ret
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
.p2align 4
|
|
Packit |
6c4009 |
L(return_null):
|
|
Packit |
6c4009 |
xor %eax, %eax
|
|
Packit |
6c4009 |
ret
|
|
Packit |
6c4009 |
END(MEMCHR)
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#ifndef USE_AS_WMEMCHR
|
|
Packit |
6c4009 |
strong_alias (memchr, __memchr)
|
|
Packit |
6c4009 |
libc_hidden_builtin_def(memchr)
|
|
Packit |
6c4009 |
#endif
|