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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.
229 lines
4.5 KiB
ArmAsm
229 lines
4.5 KiB
ArmAsm
/* strrchr (str, ch) -- Return pointer to last occurrence of CH in STR.
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Copyright (C) 2013-2019 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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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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.text
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ENTRY (strrchr)
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movd %esi, %xmm1
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movq %rdi, %rax
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andl $4095, %eax
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punpcklbw %xmm1, %xmm1
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cmpq $4032, %rax
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punpcklwd %xmm1, %xmm1
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pshufd $0, %xmm1, %xmm1
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ja L(cross_page)
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movdqu (%rdi), %xmm0
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pxor %xmm2, %xmm2
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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, %ecx
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pmovmskb %xmm3, %edx
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testq %rdx, %rdx
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je L(next_48_bytes)
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leaq -1(%rdx), %rax
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xorq %rdx, %rax
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andq %rcx, %rax
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je L(exit)
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bsrq %rax, %rax
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addq %rdi, %rax
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ret
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.p2align 4
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L(next_48_bytes):
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movdqu 16(%rdi), %xmm4
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movdqa %xmm4, %xmm5
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movdqu 32(%rdi), %xmm3
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pcmpeqb %xmm1, %xmm4
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pcmpeqb %xmm2, %xmm5
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movdqu 48(%rdi), %xmm0
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pmovmskb %xmm5, %edx
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movdqa %xmm3, %xmm5
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pcmpeqb %xmm1, %xmm3
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pcmpeqb %xmm2, %xmm5
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pcmpeqb %xmm0, %xmm2
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salq $16, %rdx
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pmovmskb %xmm3, %r8d
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pmovmskb %xmm5, %eax
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pmovmskb %xmm2, %esi
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salq $32, %r8
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salq $32, %rax
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pcmpeqb %xmm1, %xmm0
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orq %rdx, %rax
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movq %rsi, %rdx
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pmovmskb %xmm4, %esi
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salq $48, %rdx
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salq $16, %rsi
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orq %r8, %rsi
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orq %rcx, %rsi
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pmovmskb %xmm0, %ecx
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salq $48, %rcx
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orq %rcx, %rsi
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orq %rdx, %rax
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je L(loop_header2)
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leaq -1(%rax), %rcx
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xorq %rax, %rcx
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andq %rcx, %rsi
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je L(exit)
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bsrq %rsi, %rsi
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leaq (%rdi,%rsi), %rax
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ret
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.p2align 4
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L(loop_header2):
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testq %rsi, %rsi
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movq %rdi, %rcx
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je L(no_c_found)
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L(loop_header):
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addq $64, %rdi
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pxor %xmm7, %xmm7
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andq $-64, %rdi
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jmp L(loop_entry)
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.p2align 4
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L(loop64):
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testq %rdx, %rdx
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cmovne %rdx, %rsi
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cmovne %rdi, %rcx
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addq $64, %rdi
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L(loop_entry):
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movdqa 32(%rdi), %xmm3
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pxor %xmm6, %xmm6
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movdqa 48(%rdi), %xmm2
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movdqa %xmm3, %xmm0
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movdqa 16(%rdi), %xmm4
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pminub %xmm2, %xmm0
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movdqa (%rdi), %xmm5
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pminub %xmm4, %xmm0
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pminub %xmm5, %xmm0
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pcmpeqb %xmm7, %xmm0
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pmovmskb %xmm0, %eax
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movdqa %xmm5, %xmm0
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pcmpeqb %xmm1, %xmm0
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pmovmskb %xmm0, %r9d
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movdqa %xmm4, %xmm0
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pcmpeqb %xmm1, %xmm0
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pmovmskb %xmm0, %edx
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movdqa %xmm3, %xmm0
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pcmpeqb %xmm1, %xmm0
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salq $16, %rdx
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pmovmskb %xmm0, %r10d
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movdqa %xmm2, %xmm0
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pcmpeqb %xmm1, %xmm0
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salq $32, %r10
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orq %r10, %rdx
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pmovmskb %xmm0, %r8d
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orq %r9, %rdx
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salq $48, %r8
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orq %r8, %rdx
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testl %eax, %eax
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je L(loop64)
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pcmpeqb %xmm6, %xmm4
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pcmpeqb %xmm6, %xmm3
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pcmpeqb %xmm6, %xmm5
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pmovmskb %xmm4, %eax
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pmovmskb %xmm3, %r10d
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pcmpeqb %xmm6, %xmm2
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pmovmskb %xmm5, %r9d
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salq $32, %r10
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salq $16, %rax
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pmovmskb %xmm2, %r8d
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orq %r10, %rax
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orq %r9, %rax
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salq $48, %r8
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orq %r8, %rax
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leaq -1(%rax), %r8
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xorq %rax, %r8
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andq %r8, %rdx
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cmovne %rdi, %rcx
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cmovne %rdx, %rsi
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bsrq %rsi, %rsi
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leaq (%rcx,%rsi), %rax
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ret
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.p2align 4
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L(no_c_found):
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movl $1, %esi
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xorl %ecx, %ecx
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jmp L(loop_header)
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.p2align 4
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L(exit):
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xorl %eax, %eax
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ret
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.p2align 4
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L(cross_page):
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movq %rdi, %rax
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pxor %xmm0, %xmm0
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andq $-64, %rax
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movdqu (%rax), %xmm5
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movdqa %xmm5, %xmm6
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movdqu 16(%rax), %xmm4
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pcmpeqb %xmm1, %xmm5
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pcmpeqb %xmm0, %xmm6
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movdqu 32(%rax), %xmm3
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pmovmskb %xmm6, %esi
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movdqa %xmm4, %xmm6
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movdqu 48(%rax), %xmm2
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pcmpeqb %xmm1, %xmm4
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pcmpeqb %xmm0, %xmm6
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pmovmskb %xmm6, %edx
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movdqa %xmm3, %xmm6
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pcmpeqb %xmm1, %xmm3
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pcmpeqb %xmm0, %xmm6
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pcmpeqb %xmm2, %xmm0
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salq $16, %rdx
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pmovmskb %xmm3, %r9d
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pmovmskb %xmm6, %r8d
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pmovmskb %xmm0, %ecx
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salq $32, %r9
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salq $32, %r8
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pcmpeqb %xmm1, %xmm2
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orq %r8, %rdx
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salq $48, %rcx
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pmovmskb %xmm5, %r8d
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orq %rsi, %rdx
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pmovmskb %xmm4, %esi
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orq %rcx, %rdx
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pmovmskb %xmm2, %ecx
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salq $16, %rsi
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salq $48, %rcx
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orq %r9, %rsi
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orq %r8, %rsi
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orq %rcx, %rsi
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movl %edi, %ecx
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subl %eax, %ecx
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shrq %cl, %rdx
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shrq %cl, %rsi
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testq %rdx, %rdx
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je L(loop_header2)
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leaq -1(%rdx), %rax
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xorq %rdx, %rax
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andq %rax, %rsi
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je L(exit)
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bsrq %rsi, %rax
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addq %rdi, %rax
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ret
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END (strrchr)
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weak_alias (strrchr, rindex)
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libc_hidden_builtin_def (strrchr)
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