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221 lines
3.8 KiB
ArmAsm
221 lines
3.8 KiB
ArmAsm
/* wcschr with SSE2, without using bsf instructions
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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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atom_text_section
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ENTRY (__wcschr_sse2)
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mov STR1(%esp), %ecx
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movd STR2(%esp), %xmm1
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mov %ecx, %eax
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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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and $63, %eax
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cmp $48, %eax
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ja L(cross_cache)
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movdqu (%ecx), %xmm0
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pcmpeqd %xmm0, %xmm2
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pcmpeqd %xmm1, %xmm0
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pmovmskb %xmm2, %edx
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pmovmskb %xmm0, %eax
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or %eax, %edx
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jnz L(matches)
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and $-16, %ecx
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jmp L(loop)
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.p2align 4
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L(cross_cache):
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PUSH (%edi)
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mov %ecx, %edi
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mov %eax, %ecx
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and $-16, %edi
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and $15, %ecx
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movdqa (%edi), %xmm0
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pcmpeqd %xmm0, %xmm2
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pcmpeqd %xmm1, %xmm0
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pmovmskb %xmm2, %edx
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pmovmskb %xmm0, %eax
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sarl %cl, %edx
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sarl %cl, %eax
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test %eax, %eax
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jz L(unaligned_no_match)
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add %edi, %ecx
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POP (%edi)
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test %edx, %edx
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jz L(match_case1)
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test %al, %al
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jz L(match_higth_case2)
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test $15, %al
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jnz L(match_case2_4)
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test $15, %dl
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jnz L(return_null)
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lea 4(%ecx), %eax
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ret
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CFI_PUSH (%edi)
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.p2align 4
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L(unaligned_no_match):
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mov %edi, %ecx
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POP (%edi)
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test %edx, %edx
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jnz L(return_null)
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pxor %xmm2, %xmm2
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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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add $16, %ecx
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movdqa (%ecx), %xmm0
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pcmpeqd %xmm0, %xmm2
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pcmpeqd %xmm1, %xmm0
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pmovmskb %xmm2, %edx
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pmovmskb %xmm0, %eax
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or %eax, %edx
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jnz L(matches)
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add $16, %ecx
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movdqa (%ecx), %xmm0
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pcmpeqd %xmm0, %xmm2
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pcmpeqd %xmm1, %xmm0
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pmovmskb %xmm2, %edx
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pmovmskb %xmm0, %eax
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or %eax, %edx
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jnz L(matches)
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add $16, %ecx
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movdqa (%ecx), %xmm0
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pcmpeqd %xmm0, %xmm2
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pcmpeqd %xmm1, %xmm0
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pmovmskb %xmm2, %edx
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pmovmskb %xmm0, %eax
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or %eax, %edx
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jnz L(matches)
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add $16, %ecx
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movdqa (%ecx), %xmm0
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pcmpeqd %xmm0, %xmm2
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pcmpeqd %xmm1, %xmm0
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pmovmskb %xmm2, %edx
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pmovmskb %xmm0, %eax
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or %eax, %edx
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jz L(loop)
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.p2align 4
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L(matches):
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pmovmskb %xmm2, %edx
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test %eax, %eax
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jz L(return_null)
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test %edx, %edx
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jz L(match_case1)
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.p2align 4
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L(match_case2):
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test %al, %al
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jz L(match_higth_case2)
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test $15, %al
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jnz L(match_case2_4)
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test $15, %dl
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jnz L(return_null)
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lea 4(%ecx), %eax
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ret
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.p2align 4
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L(match_case2_4):
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mov %ecx, %eax
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ret
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.p2align 4
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L(match_higth_case2):
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test %dl, %dl
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jnz L(return_null)
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test $15, %ah
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jnz L(match_case2_12)
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test $15, %dh
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jnz L(return_null)
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lea 12(%ecx), %eax
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ret
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.p2align 4
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L(match_case2_12):
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lea 8(%ecx), %eax
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ret
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.p2align 4
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L(match_case1):
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test %al, %al
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jz L(match_higth_case1)
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test $0x01, %al
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jnz L(exit0)
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lea 4(%ecx), %eax
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ret
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.p2align 4
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L(match_higth_case1):
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test $0x01, %ah
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jnz L(exit3)
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lea 12(%ecx), %eax
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ret
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.p2align 4
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L(exit0):
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mov %ecx, %eax
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ret
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.p2align 4
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L(exit3):
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lea 8(%ecx), %eax
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ret
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.p2align 4
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L(return_null):
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xor %eax, %eax
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ret
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END (__wcschr_sse2)
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#endif
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