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284 lines
4.7 KiB
ArmAsm
284 lines
4.7 KiB
ArmAsm
/* strrchr with SSE2 with bsf and bsr
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Copyright (C) 2011 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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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 4
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# define STR1 PARMS
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# define STR2 STR1+4
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.text
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ENTRY (__strrchr_sse2_bsf)
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mov STR1(%esp), %ecx
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movd STR2(%esp), %xmm1
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PUSH (%edi)
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pxor %xmm2, %xmm2
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mov %ecx, %edi
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punpcklbw %xmm1, %xmm1
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punpcklbw %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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pshufd $0, %xmm1, %xmm1
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ja L(crosscashe)
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/* unaligned string. */
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movdqu (%edi), %xmm0
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pcmpeqb %xmm0, %xmm2
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pcmpeqb %xmm1, %xmm0
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/* Find where NULL is. */
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pmovmskb %xmm2, %edx
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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(unaligned_match1)
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test %edx, %edx
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jnz L(return_null)
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and $-16, %edi
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add $16, %edi
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PUSH (%esi)
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PUSH (%ebx)
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xor %ebx, %ebx
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jmp L(loop)
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CFI_POP (%esi)
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CFI_POP (%ebx)
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.p2align 4
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L(unaligned_return_value1):
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bsf %edx, %ecx
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mov $2, %edx
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shl %cl, %edx
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sub $1, %edx
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and %edx, %eax
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jz L(return_null)
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bsr %eax, %eax
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add %edi, %eax
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POP (%edi)
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ret
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CFI_PUSH (%edi)
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.p2align 4
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L(unaligned_match1):
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test %edx, %edx
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jnz L(unaligned_return_value1)
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PUSH (%esi)
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PUSH (%ebx)
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mov %eax, %ebx
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lea 16(%edi), %esi
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and $-16, %edi
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add $16, %edi
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jmp L(loop)
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CFI_POP (%esi)
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CFI_POP (%ebx)
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.p2align 4
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L(crosscashe):
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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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pcmpeqb %xmm0, %xmm3
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pcmpeqb %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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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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add $16, %edi
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PUSH (%esi)
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PUSH (%ebx)
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xor %ebx, %ebx
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jmp L(loop)
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CFI_POP (%esi)
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CFI_POP (%ebx)
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.p2align 4
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L(unaligned_return_value):
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add %ecx, %edi
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bsf %edx, %ecx
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mov $2, %edx
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shl %cl, %edx
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sub $1, %edx
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and %edx, %eax
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jz L(return_null)
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bsr %eax, %eax
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add %edi, %eax
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POP (%edi)
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ret
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CFI_PUSH (%edi)
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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(unaligned_return_value)
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PUSH (%esi)
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PUSH (%ebx)
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mov %eax, %ebx
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add $16, %edi
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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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pcmpeqb %xmm0, %xmm2
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add $16, %edi
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pcmpeqb %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), %xmm0
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pcmpeqb %xmm0, %xmm2
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add $16, %edi
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pcmpeqb %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), %xmm0
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pcmpeqb %xmm0, %xmm2
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add $16, %edi
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pcmpeqb %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), %xmm0
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pcmpeqb %xmm0, %xmm2
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add $16, %edi
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pcmpeqb %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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jz L(loop)
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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 %ebx, %ebx
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jz L(return_null_1)
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bsr %ebx, %eax
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add %esi, %eax
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POP (%ebx)
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POP (%esi)
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sub $16, %eax
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POP (%edi)
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ret
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CFI_PUSH (%edi)
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CFI_PUSH (%ebx)
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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(return_value_1)
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mov %eax, %ebx
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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(return_value_1):
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bsf %ecx, %ecx
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mov $2, %edx
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shl %cl, %edx
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sub $1, %edx
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and %edx, %eax
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jz L(return_value)
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POP (%ebx)
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POP (%esi)
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bsr %eax, %eax
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add %edi, %eax
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sub $16, %eax
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POP (%edi)
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ret
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CFI_PUSH (%edi)
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/* Return NULL. */
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.p2align 4
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L(return_null):
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xor %eax, %eax
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POP (%edi)
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ret
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CFI_PUSH (%edi)
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CFI_PUSH (%ebx)
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CFI_PUSH (%esi)
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/* Return NULL. */
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.p2align 4
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L(return_null_1):
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POP (%ebx)
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POP (%esi)
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POP (%edi)
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xor %eax, %eax
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ret
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END (__strrchr_sse2_bsf)
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#endif
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