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163 lines
3.0 KiB
ArmAsm
163 lines
3.0 KiB
ArmAsm
/* wcschr optimized with SSE2.
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Copyright (C) 2017-2023 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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/* ISA level >= 2 because there is no wcschr-sse4 implementations. */
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#if ISA_SHOULD_BUILD (2)
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# ifndef WCSCHR
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# define WCSCHR __wcschr_sse2
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# endif
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# include <sysdep.h>
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.text
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ENTRY (WCSCHR)
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movd %rsi, %xmm1
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pxor %xmm2, %xmm2
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mov %rdi, %rcx
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punpckldq %xmm1, %xmm1
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punpckldq %xmm1, %xmm1
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and $63, %rcx
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cmp $48, %rcx
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ja L(cross_cache)
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movdqu (%rdi), %xmm0
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pcmpeqd %xmm0, %xmm2
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add $16, %rdi
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pcmpeqd %xmm1, %xmm0
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pmovmskb %xmm2, %rdx
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pmovmskb %xmm0, %rax
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or %rax, %rdx
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jnz L(matches)
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and $-16, %rdi
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movdqa (%rdi), %xmm0
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pcmpeqd %xmm0, %xmm2
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add $16, %rdi
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pcmpeqd %xmm1, %xmm0
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pmovmskb %xmm2, %rdx
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pmovmskb %xmm0, %rax
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or %rax, %rdx
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jnz L(matches)
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jmp L(loop)
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L(cross_cache):
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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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pcmpeqd %xmm0, %xmm2
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pcmpeqd %xmm1, %xmm0
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pmovmskb %xmm2, %rdx
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pmovmskb %xmm0, %rax
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sar %cl, %rdx
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sar %cl, %rax
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test %rax, %rax
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je L(unaligned_no_match)
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bsf %rax, %rax
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test %rdx, %rdx
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je L(unaligned_match)
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bsf %rdx, %rdx
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cmp %rdx, %rax
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ja L(return_null)
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L(unaligned_match):
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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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test %rdx, %rdx
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jne L(return_null)
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pxor %xmm2, %xmm2
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add $16, %rdi
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.p2align 4
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/* Loop start on aligned string. */
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L(loop):
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movdqa (%rdi), %xmm0
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pcmpeqd %xmm0, %xmm2
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add $16, %rdi
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pcmpeqd %xmm1, %xmm0
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pmovmskb %xmm2, %rdx
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pmovmskb %xmm0, %rax
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or %rax, %rdx
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jnz L(matches)
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movdqa (%rdi), %xmm0
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pcmpeqd %xmm0, %xmm2
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add $16, %rdi
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pcmpeqd %xmm1, %xmm0
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pmovmskb %xmm2, %rdx
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pmovmskb %xmm0, %rax
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or %rax, %rdx
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jnz L(matches)
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movdqa (%rdi), %xmm0
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pcmpeqd %xmm0, %xmm2
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add $16, %rdi
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pcmpeqd %xmm1, %xmm0
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pmovmskb %xmm2, %rdx
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pmovmskb %xmm0, %rax
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or %rax, %rdx
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jnz L(matches)
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movdqa (%rdi), %xmm0
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pcmpeqd %xmm0, %xmm2
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add $16, %rdi
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pcmpeqd %xmm1, %xmm0
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pmovmskb %xmm2, %rdx
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pmovmskb %xmm0, %rax
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or %rax, %rdx
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jnz L(matches)
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jmp L(loop)
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.p2align 4
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L(matches):
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pmovmskb %xmm2, %rdx
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test %rax, %rax
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jz L(return_null)
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bsf %rax, %rax
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test %rdx, %rdx
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je L(match)
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bsf %rdx, %rcx
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cmp %rcx, %rax
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ja L(return_null)
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L(match):
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sub $16, %rdi
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add %rdi, %rax
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ret
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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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END (WCSCHR)
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#endif
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