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355 lines
6.0 KiB
ArmAsm
355 lines
6.0 KiB
ArmAsm
/* wcsrchr with SSE2, without using bsf instructions.
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Copyright (C) 2011-2013 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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#ifndef NOT_IN_libc
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# include <sysdep.h>
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# define CFI_PUSH(REG) \
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cfi_adjust_cfa_offset (4); \
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cfi_rel_offset (REG, 0)
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# define CFI_POP(REG) \
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cfi_adjust_cfa_offset (-4); \
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cfi_restore (REG)
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# define PUSH(REG) pushl REG; CFI_PUSH (REG)
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# define POP(REG) popl REG; CFI_POP (REG)
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# define PARMS 8
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# define ENTRANCE PUSH (%edi);
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# define RETURN POP (%edi); ret; CFI_PUSH (%edi);
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# define STR1 PARMS
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# define STR2 STR1+4
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atom_text_section
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ENTRY (__wcsrchr_sse2)
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ENTRANCE
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mov STR1(%esp), %ecx
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movd STR2(%esp), %xmm1
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mov %ecx, %edi
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punpckldq %xmm1, %xmm1
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pxor %xmm2, %xmm2
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punpckldq %xmm1, %xmm1
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/* ECX has OFFSET. */
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and $63, %ecx
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cmp $48, %ecx
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ja L(crosscache)
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/* unaligned string. */
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movdqu (%edi), %xmm0
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pcmpeqd %xmm0, %xmm2
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pcmpeqd %xmm1, %xmm0
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/* Find where NULL is. */
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pmovmskb %xmm2, %ecx
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/* Check if there is a match. */
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pmovmskb %xmm0, %eax
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add $16, %edi
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test %eax, %eax
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jnz L(unaligned_match1)
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test %ecx, %ecx
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jnz L(return_null)
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and $-16, %edi
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PUSH (%esi)
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xor %edx, %edx
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jmp L(loop)
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CFI_POP (%esi)
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.p2align 4
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L(unaligned_match1):
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test %ecx, %ecx
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jnz L(prolog_find_zero_1)
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PUSH (%esi)
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/* Save current match */
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mov %eax, %edx
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mov %edi, %esi
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and $-16, %edi
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jmp L(loop)
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CFI_POP (%esi)
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.p2align 4
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L(crosscache):
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/* Hancle unaligned string. */
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and $15, %ecx
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and $-16, %edi
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pxor %xmm3, %xmm3
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movdqa (%edi), %xmm0
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pcmpeqd %xmm0, %xmm3
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pcmpeqd %xmm1, %xmm0
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/* Find where NULL is. */
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pmovmskb %xmm3, %edx
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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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shr %cl, %edx
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shr %cl, %eax
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add $16, %edi
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test %eax, %eax
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jnz L(unaligned_match)
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test %edx, %edx
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jnz L(return_null)
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PUSH (%esi)
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xor %edx, %edx
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jmp L(loop)
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CFI_POP (%esi)
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.p2align 4
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L(unaligned_match):
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test %edx, %edx
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jnz L(prolog_find_zero)
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PUSH (%esi)
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mov %eax, %edx
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lea (%edi, %ecx), %esi
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/* Loop start on aligned string. */
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.p2align 4
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L(loop):
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movdqa (%edi), %xmm0
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pcmpeqd %xmm0, %xmm2
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add $16, %edi
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pcmpeqd %xmm1, %xmm0
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pmovmskb %xmm2, %ecx
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pmovmskb %xmm0, %eax
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or %eax, %ecx
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jnz L(matches)
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movdqa (%edi), %xmm3
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pcmpeqd %xmm3, %xmm2
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add $16, %edi
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pcmpeqd %xmm1, %xmm3
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pmovmskb %xmm2, %ecx
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pmovmskb %xmm3, %eax
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or %eax, %ecx
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jnz L(matches)
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movdqa (%edi), %xmm4
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pcmpeqd %xmm4, %xmm2
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add $16, %edi
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pcmpeqd %xmm1, %xmm4
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pmovmskb %xmm2, %ecx
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pmovmskb %xmm4, %eax
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or %eax, %ecx
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jnz L(matches)
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movdqa (%edi), %xmm5
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pcmpeqd %xmm5, %xmm2
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add $16, %edi
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pcmpeqd %xmm1, %xmm5
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pmovmskb %xmm2, %ecx
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pmovmskb %xmm5, %eax
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or %eax, %ecx
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jz L(loop)
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.p2align 4
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L(matches):
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test %eax, %eax
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jnz L(match)
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L(return_value):
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test %edx, %edx
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jz L(return_null_1)
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mov %edx, %eax
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mov %esi, %edi
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POP (%esi)
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test %ah, %ah
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jnz L(match_third_or_fourth_wchar)
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test $15 << 4, %al
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jnz L(match_second_wchar)
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lea -16(%edi), %eax
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RETURN
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CFI_PUSH (%esi)
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.p2align 4
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L(return_null_1):
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POP (%esi)
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xor %eax, %eax
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RETURN
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CFI_PUSH (%esi)
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.p2align 4
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L(match):
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pmovmskb %xmm2, %ecx
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test %ecx, %ecx
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jnz L(find_zero)
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/* save match info */
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mov %eax, %edx
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mov %edi, %esi
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jmp L(loop)
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.p2align 4
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L(find_zero):
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test %cl, %cl
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jz L(find_zero_in_third_or_fourth_wchar)
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test $15, %cl
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jz L(find_zero_in_second_wchar)
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and $1, %eax
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jz L(return_value)
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POP (%esi)
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lea -16(%edi), %eax
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RETURN
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CFI_PUSH (%esi)
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.p2align 4
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L(find_zero_in_second_wchar):
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and $1 << 5 - 1, %eax
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jz L(return_value)
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POP (%esi)
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test $15 << 4, %al
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jnz L(match_second_wchar)
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lea -16(%edi), %eax
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RETURN
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CFI_PUSH (%esi)
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.p2align 4
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L(find_zero_in_third_or_fourth_wchar):
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test $15, %ch
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jz L(find_zero_in_fourth_wchar)
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and $1 << 9 - 1, %eax
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jz L(return_value)
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POP (%esi)
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test %ah, %ah
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jnz L(match_third_wchar)
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test $15 << 4, %al
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jnz L(match_second_wchar)
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lea -16(%edi), %eax
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RETURN
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CFI_PUSH (%esi)
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.p2align 4
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L(find_zero_in_fourth_wchar):
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POP (%esi)
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test %ah, %ah
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jnz L(match_third_or_fourth_wchar)
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test $15 << 4, %al
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jnz L(match_second_wchar)
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lea -16(%edi), %eax
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RETURN
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CFI_PUSH (%esi)
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.p2align 4
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L(match_second_wchar):
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lea -12(%edi), %eax
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RETURN
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.p2align 4
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L(match_third_or_fourth_wchar):
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test $15 << 4, %ah
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jnz L(match_fourth_wchar)
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lea -8(%edi), %eax
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RETURN
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.p2align 4
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L(match_third_wchar):
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lea -8(%edi), %eax
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RETURN
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.p2align 4
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L(match_fourth_wchar):
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lea -4(%edi), %eax
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RETURN
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.p2align 4
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L(return_null):
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xor %eax, %eax
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RETURN
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.p2align 4
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L(prolog_find_zero):
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add %ecx, %edi
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mov %edx, %ecx
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L(prolog_find_zero_1):
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test %cl, %cl
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jz L(prolog_find_zero_in_third_or_fourth_wchar)
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test $15, %cl
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jz L(prolog_find_zero_in_second_wchar)
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and $1, %eax
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jz L(return_null)
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lea -16(%edi), %eax
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RETURN
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.p2align 4
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L(prolog_find_zero_in_second_wchar):
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and $1 << 5 - 1, %eax
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jz L(return_null)
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test $15 << 4, %al
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jnz L(match_second_wchar)
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lea -16(%edi), %eax
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RETURN
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.p2align 4
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L(prolog_find_zero_in_third_or_fourth_wchar):
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test $15, %ch
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jz L(prolog_find_zero_in_fourth_wchar)
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and $1 << 9 - 1, %eax
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jz L(return_null)
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test %ah, %ah
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jnz L(match_third_wchar)
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test $15 << 4, %al
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jnz L(match_second_wchar)
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lea -16(%edi), %eax
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RETURN
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.p2align 4
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L(prolog_find_zero_in_fourth_wchar):
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test %ah, %ah
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jnz L(match_third_or_fourth_wchar)
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test $15 << 4, %al
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jnz L(match_second_wchar)
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lea -16(%edi), %eax
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RETURN
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END (__wcsrchr_sse2)
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#endif
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