392 lines
6.8 KiB
ArmAsm
392 lines
6.8 KiB
ArmAsm
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/*
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Copyright (c) 2011, Intel Corporation
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* Neither the name of Intel Corporation nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef L
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# define L(label) .L##label
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#endif
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#ifndef cfi_startproc
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# define cfi_startproc .cfi_startproc
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#endif
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#ifndef cfi_endproc
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# define cfi_endproc .cfi_endproc
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#endif
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#ifndef cfi_rel_offset
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# define cfi_rel_offset(reg, off) .cfi_rel_offset reg, off
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#endif
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#ifndef cfi_restore
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# define cfi_restore(reg) .cfi_restore reg
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#endif
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#ifndef cfi_adjust_cfa_offset
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# define cfi_adjust_cfa_offset(off) .cfi_adjust_cfa_offset off
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#endif
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#ifndef ENTRY
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# define ENTRY(name) \
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.type name, @function; \
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.globl name; \
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.p2align 4; \
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name: \
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cfi_startproc
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#endif
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#ifndef END
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# define END(name) \
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cfi_endproc; \
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.size name, .-name
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#endif
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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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.text
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ENTRY (strchr)
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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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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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.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)
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