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349 lines
5.7 KiB
ArmAsm
349 lines
5.7 KiB
ArmAsm
/* strchr SSE2 without bsf
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Copyright (C) 2011-2017 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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#if IS_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 (__strchr_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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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 $15, %ecx
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pshufd $0, %xmm1, %xmm1
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je L(loop)
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/* Handle unaligned string. */
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and $-16, %edi
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movdqa (%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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/* Remove the leading bytes. */
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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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/* Check which byte is a match. */
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/* Is there a NULL? */
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add %ecx, %edi
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test %edx, %edx
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jz L(match_case1)
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jmp L(match_case2)
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.p2align 4
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L(unaligned_no_match):
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test %edx, %edx
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jne L(return_null)
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pxor %xmm2, %xmm2
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add $16, %edi
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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 (%edi), %xmm0
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pcmpeqb %xmm0, %xmm2
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pcmpeqb %xmm1, %xmm0
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pmovmskb %xmm2, %edx
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pmovmskb %xmm0, %eax
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test %eax, %eax
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jnz L(matches)
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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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movdqa (%edi), %xmm0
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pcmpeqb %xmm0, %xmm2
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pcmpeqb %xmm1, %xmm0
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pmovmskb %xmm2, %edx
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pmovmskb %xmm0, %eax
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test %eax, %eax
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jnz L(matches)
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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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movdqa (%edi), %xmm0
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pcmpeqb %xmm0, %xmm2
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pcmpeqb %xmm1, %xmm0
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pmovmskb %xmm2, %edx
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pmovmskb %xmm0, %eax
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test %eax, %eax
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jnz L(matches)
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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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movdqa (%edi), %xmm0
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pcmpeqb %xmm0, %xmm2
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pcmpeqb %xmm1, %xmm0
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pmovmskb %xmm2, %edx
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pmovmskb %xmm0, %eax
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test %eax, %eax
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jnz L(matches)
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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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jmp L(loop)
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L(matches):
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/* There is a match. First find where NULL is. */
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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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mov %al, %cl
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and $15, %cl
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jnz L(match_case2_4)
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mov %dl, %ch
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and $15, %ch
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jnz L(return_null)
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test $0x10, %al
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jnz L(Exit5)
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test $0x10, %dl
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jnz L(return_null)
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test $0x20, %al
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jnz L(Exit6)
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test $0x20, %dl
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jnz L(return_null)
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test $0x40, %al
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jnz L(Exit7)
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test $0x40, %dl
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jnz L(return_null)
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lea 7(%edi), %eax
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RETURN
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.p2align 4
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L(match_case2_4):
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test $0x01, %al
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jnz L(Exit1)
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test $0x01, %dl
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jnz L(return_null)
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test $0x02, %al
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jnz L(Exit2)
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test $0x02, %dl
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jnz L(return_null)
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test $0x04, %al
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jnz L(Exit3)
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test $0x04, %dl
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jnz L(return_null)
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lea 3(%edi), %eax
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RETURN
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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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mov %ah, %cl
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and $15, %cl
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jnz L(match_case2_12)
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mov %dh, %ch
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and $15, %ch
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jnz L(return_null)
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test $0x10, %ah
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jnz L(Exit13)
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test $0x10, %dh
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jnz L(return_null)
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test $0x20, %ah
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jnz L(Exit14)
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test $0x20, %dh
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jnz L(return_null)
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test $0x40, %ah
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jnz L(Exit15)
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test $0x40, %dh
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jnz L(return_null)
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lea 15(%edi), %eax
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RETURN
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.p2align 4
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L(match_case2_12):
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test $0x01, %ah
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jnz L(Exit9)
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test $0x01, %dh
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jnz L(return_null)
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test $0x02, %ah
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jnz L(Exit10)
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test $0x02, %dh
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jnz L(return_null)
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test $0x04, %ah
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jnz L(Exit11)
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test $0x04, %dh
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jnz L(return_null)
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lea 11(%edi), %eax
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RETURN
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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(Exit1)
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test $0x02, %al
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jnz L(Exit2)
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test $0x04, %al
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jnz L(Exit3)
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test $0x08, %al
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jnz L(Exit4)
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test $0x10, %al
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jnz L(Exit5)
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test $0x20, %al
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jnz L(Exit6)
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test $0x40, %al
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jnz L(Exit7)
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lea 7(%edi), %eax
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RETURN
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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(Exit9)
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test $0x02, %ah
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jnz L(Exit10)
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test $0x04, %ah
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jnz L(Exit11)
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test $0x08, %ah
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jnz L(Exit12)
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test $0x10, %ah
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jnz L(Exit13)
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test $0x20, %ah
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jnz L(Exit14)
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test $0x40, %ah
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jnz L(Exit15)
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lea 15(%edi), %eax
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RETURN
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.p2align 4
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L(Exit1):
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lea (%edi), %eax
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RETURN
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.p2align 4
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L(Exit2):
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lea 1(%edi), %eax
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RETURN
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.p2align 4
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L(Exit3):
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lea 2(%edi), %eax
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RETURN
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.p2align 4
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L(Exit4):
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lea 3(%edi), %eax
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RETURN
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.p2align 4
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L(Exit5):
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lea 4(%edi), %eax
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RETURN
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.p2align 4
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L(Exit6):
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lea 5(%edi), %eax
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RETURN
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.p2align 4
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L(Exit7):
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lea 6(%edi), %eax
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RETURN
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.p2align 4
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L(Exit9):
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lea 8(%edi), %eax
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RETURN
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.p2align 4
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L(Exit10):
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lea 9(%edi), %eax
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RETURN
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.p2align 4
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L(Exit11):
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lea 10(%edi), %eax
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RETURN
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.p2align 4
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L(Exit12):
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lea 11(%edi), %eax
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RETURN
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.p2align 4
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L(Exit13):
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lea 12(%edi), %eax
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RETURN
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.p2align 4
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L(Exit14):
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lea 13(%edi), %eax
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RETURN
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.p2align 4
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L(Exit15):
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lea 14(%edi), %eax
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RETURN
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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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RETURN
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END (__strchr_sse2)
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#endif
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