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04277e02d7
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
203 lines
3.6 KiB
ArmAsm
203 lines
3.6 KiB
ArmAsm
/* fast SSE2 memchr with 64 byte loop and pmaxub instruction using
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Copyright (C) 2011-2019 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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.text
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ENTRY (__rawmemchr)
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movd %rsi, %xmm1
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mov %rdi, %rcx
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punpcklbw %xmm1, %xmm1
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punpcklbw %xmm1, %xmm1
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and $63, %rcx
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pshufd $0, %xmm1, %xmm1
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cmp $48, %rcx
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ja L(crosscache)
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movdqu (%rdi), %xmm0
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pcmpeqb %xmm1, %xmm0
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/* Check if there is a match. */
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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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add $16, %rdi
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and $-16, %rdi
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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, %rcx
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and $-16, %rdi
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movdqa (%rdi), %xmm0
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pcmpeqb %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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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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add $16, %rdi
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.p2align 4
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L(loop_prolog):
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movdqa (%rdi), %xmm0
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pcmpeqb %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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pcmpeqb %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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pcmpeqb %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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pcmpeqb %xmm1, %xmm4
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add $64, %rdi
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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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movdqa (%rdi), %xmm0
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pcmpeqb %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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pcmpeqb %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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pcmpeqb %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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pcmpeqb %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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and $-64, %rdi
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.p2align 4
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L(align64_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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pcmpeqb %xmm1, %xmm0
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pcmpeqb %xmm1, %xmm2
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pcmpeqb %xmm1, %xmm3
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pcmpeqb %xmm1, %xmm4
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pmaxub %xmm0, %xmm3
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pmaxub %xmm2, %xmm4
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pmaxub %xmm3, %xmm4
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pmovmskb %xmm4, %eax
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add $64, %rdi
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test %eax, %eax
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jz L(align64_loop)
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sub $64, %rdi
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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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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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pcmpeqb %xmm1, %xmm3
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pcmpeqb 48(%rdi), %xmm1
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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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pmovmskb %xmm1, %eax
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bsf %eax, %eax
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lea 48(%rdi, %rax), %rax
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ret
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.p2align 4
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L(matches0):
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bsf %eax, %eax
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lea -16(%rax, %rdi), %rax
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ret
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.p2align 4
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L(matches):
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bsf %eax, %eax
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add %rdi, %rax
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ret
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.p2align 4
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L(matches16):
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bsf %eax, %eax
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lea 16(%rax, %rdi), %rax
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ret
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.p2align 4
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L(matches32):
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bsf %eax, %eax
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lea 32(%rax, %rdi), %rax
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ret
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END (__rawmemchr)
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weak_alias (__rawmemchr, rawmemchr)
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libc_hidden_builtin_def (__rawmemchr)
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