| /* |
| Copyright (c) 2011, Intel Corporation |
| All rights reserved. |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions are met: |
| |
| * Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| |
| * Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| |
| * Neither the name of Intel Corporation nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
| ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR |
| ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON |
| ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef L |
| # define L(label) .L##label |
| #endif |
| |
| #ifndef cfi_startproc |
| # define cfi_startproc .cfi_startproc |
| #endif |
| |
| #ifndef cfi_endproc |
| # define cfi_endproc .cfi_endproc |
| #endif |
| |
| #ifndef cfi_rel_offset |
| # define cfi_rel_offset(reg, off) .cfi_rel_offset reg, off |
| #endif |
| |
| #ifndef cfi_restore |
| # define cfi_restore(reg) .cfi_restore reg |
| #endif |
| |
| #ifndef cfi_adjust_cfa_offset |
| # define cfi_adjust_cfa_offset(off) .cfi_adjust_cfa_offset off |
| #endif |
| |
| #ifndef ENTRY |
| # define ENTRY(name) \ |
| .type name, @function; \ |
| .globl name; \ |
| .p2align 4; \ |
| name: \ |
| cfi_startproc |
| #endif |
| |
| #ifndef END |
| # define END(name) \ |
| cfi_endproc; \ |
| .size name, .-name |
| #endif |
| |
| #define CFI_PUSH(REG) \ |
| cfi_adjust_cfa_offset (4); \ |
| cfi_rel_offset (REG, 0) |
| |
| #define CFI_POP(REG) \ |
| cfi_adjust_cfa_offset (-4); \ |
| cfi_restore (REG) |
| |
| #define PUSH(REG) pushl REG; CFI_PUSH (REG) |
| #define POP(REG) popl REG; CFI_POP (REG) |
| |
| #define PARMS 8 |
| #define ENTRANCE PUSH(%edi) |
| #define RETURN POP (%edi); ret; CFI_PUSH (%edi); |
| |
| |
| #define STR1 PARMS |
| #define STR2 STR1+4 |
| |
| .text |
| ENTRY (strchr) |
| |
| ENTRANCE |
| mov STR1(%esp), %ecx |
| movd STR2(%esp), %xmm1 |
| |
| pxor %xmm2, %xmm2 |
| mov %ecx, %edi |
| punpcklbw %xmm1, %xmm1 |
| punpcklbw %xmm1, %xmm1 |
| /* ECX has OFFSET. */ |
| and $15, %ecx |
| pshufd $0, %xmm1, %xmm1 |
| je L(loop) |
| |
| /* Handle unaligned string. */ |
| and $-16, %edi |
| movdqa (%edi), %xmm0 |
| pcmpeqb %xmm0, %xmm2 |
| pcmpeqb %xmm1, %xmm0 |
| /* Find where NULL is. */ |
| pmovmskb %xmm2, %edx |
| /* Check if there is a match. */ |
| pmovmskb %xmm0, %eax |
| /* Remove the leading bytes. */ |
| sarl %cl, %edx |
| sarl %cl, %eax |
| test %eax, %eax |
| jz L(unaligned_no_match) |
| add %ecx, %edi |
| test %edx, %edx |
| jz L(match_case1) |
| jmp L(match_case2) |
| |
| .p2align 4 |
| L(unaligned_no_match): |
| test %edx, %edx |
| jne L(return_null) |
| |
| pxor %xmm2, %xmm2 |
| add $16, %edi |
| |
| .p2align 4 |
| /* Loop start on aligned string. */ |
| L(loop): |
| movdqa (%edi), %xmm0 |
| pcmpeqb %xmm0, %xmm2 |
| pcmpeqb %xmm1, %xmm0 |
| pmovmskb %xmm2, %edx |
| pmovmskb %xmm0, %eax |
| test %eax, %eax |
| jnz L(matches) |
| test %edx, %edx |
| jnz L(return_null) |
| add $16, %edi |
| |
| movdqa (%edi), %xmm0 |
| pcmpeqb %xmm0, %xmm2 |
| pcmpeqb %xmm1, %xmm0 |
| pmovmskb %xmm2, %edx |
| pmovmskb %xmm0, %eax |
| test %eax, %eax |
| jnz L(matches) |
| test %edx, %edx |
| jnz L(return_null) |
| add $16, %edi |
| |
| movdqa (%edi), %xmm0 |
| pcmpeqb %xmm0, %xmm2 |
| pcmpeqb %xmm1, %xmm0 |
| pmovmskb %xmm2, %edx |
| pmovmskb %xmm0, %eax |
| test %eax, %eax |
| jnz L(matches) |
| test %edx, %edx |
| jnz L(return_null) |
| add $16, %edi |
| |
| movdqa (%edi), %xmm0 |
| pcmpeqb %xmm0, %xmm2 |
| pcmpeqb %xmm1, %xmm0 |
| pmovmskb %xmm2, %edx |
| pmovmskb %xmm0, %eax |
| test %eax, %eax |
| jnz L(matches) |
| test %edx, %edx |
| jnz L(return_null) |
| add $16, %edi |
| jmp L(loop) |
| |
| L(matches): |
| /* There is a match. First find where NULL is. */ |
| test %edx, %edx |
| jz L(match_case1) |
| |
| .p2align 4 |
| L(match_case2): |
| test %al, %al |
| jz L(match_higth_case2) |
| |
| mov %al, %cl |
| and $15, %cl |
| jnz L(match_case2_4) |
| |
| mov %dl, %ch |
| and $15, %ch |
| jnz L(return_null) |
| |
| test $0x10, %al |
| jnz L(Exit5) |
| test $0x10, %dl |
| jnz L(return_null) |
| test $0x20, %al |
| jnz L(Exit6) |
| test $0x20, %dl |
| jnz L(return_null) |
| test $0x40, %al |
| jnz L(Exit7) |
| test $0x40, %dl |
| jnz L(return_null) |
| lea 7(%edi), %eax |
| RETURN |
| |
| .p2align 4 |
| L(match_case2_4): |
| test $0x01, %al |
| jnz L(Exit1) |
| test $0x01, %dl |
| jnz L(return_null) |
| test $0x02, %al |
| jnz L(Exit2) |
| test $0x02, %dl |
| jnz L(return_null) |
| test $0x04, %al |
| jnz L(Exit3) |
| test $0x04, %dl |
| jnz L(return_null) |
| lea 3(%edi), %eax |
| RETURN |
| |
| .p2align 4 |
| L(match_higth_case2): |
| test %dl, %dl |
| jnz L(return_null) |
| |
| mov %ah, %cl |
| and $15, %cl |
| jnz L(match_case2_12) |
| |
| mov %dh, %ch |
| and $15, %ch |
| jnz L(return_null) |
| |
| test $0x10, %ah |
| jnz L(Exit13) |
| test $0x10, %dh |
| jnz L(return_null) |
| test $0x20, %ah |
| jnz L(Exit14) |
| test $0x20, %dh |
| jnz L(return_null) |
| test $0x40, %ah |
| jnz L(Exit15) |
| test $0x40, %dh |
| jnz L(return_null) |
| lea 15(%edi), %eax |
| RETURN |
| |
| .p2align 4 |
| L(match_case2_12): |
| test $0x01, %ah |
| jnz L(Exit9) |
| test $0x01, %dh |
| jnz L(return_null) |
| test $0x02, %ah |
| jnz L(Exit10) |
| test $0x02, %dh |
| jnz L(return_null) |
| test $0x04, %ah |
| jnz L(Exit11) |
| test $0x04, %dh |
| jnz L(return_null) |
| lea 11(%edi), %eax |
| RETURN |
| |
| .p2align 4 |
| L(match_case1): |
| test %al, %al |
| jz L(match_higth_case1) |
| |
| test $0x01, %al |
| jnz L(Exit1) |
| test $0x02, %al |
| jnz L(Exit2) |
| test $0x04, %al |
| jnz L(Exit3) |
| test $0x08, %al |
| jnz L(Exit4) |
| test $0x10, %al |
| jnz L(Exit5) |
| test $0x20, %al |
| jnz L(Exit6) |
| test $0x40, %al |
| jnz L(Exit7) |
| lea 7(%edi), %eax |
| RETURN |
| |
| .p2align 4 |
| L(match_higth_case1): |
| test $0x01, %ah |
| jnz L(Exit9) |
| test $0x02, %ah |
| jnz L(Exit10) |
| test $0x04, %ah |
| jnz L(Exit11) |
| test $0x08, %ah |
| jnz L(Exit12) |
| test $0x10, %ah |
| jnz L(Exit13) |
| test $0x20, %ah |
| jnz L(Exit14) |
| test $0x40, %ah |
| jnz L(Exit15) |
| lea 15(%edi), %eax |
| RETURN |
| |
| .p2align 4 |
| L(Exit1): |
| lea (%edi), %eax |
| RETURN |
| |
| .p2align 4 |
| L(Exit2): |
| lea 1(%edi), %eax |
| RETURN |
| |
| .p2align 4 |
| L(Exit3): |
| lea 2(%edi), %eax |
| RETURN |
| |
| .p2align 4 |
| L(Exit4): |
| lea 3(%edi), %eax |
| RETURN |
| |
| .p2align 4 |
| L(Exit5): |
| lea 4(%edi), %eax |
| RETURN |
| |
| .p2align 4 |
| L(Exit6): |
| lea 5(%edi), %eax |
| RETURN |
| |
| .p2align 4 |
| L(Exit7): |
| lea 6(%edi), %eax |
| RETURN |
| |
| .p2align 4 |
| L(Exit9): |
| lea 8(%edi), %eax |
| RETURN |
| |
| .p2align 4 |
| L(Exit10): |
| lea 9(%edi), %eax |
| RETURN |
| |
| .p2align 4 |
| L(Exit11): |
| lea 10(%edi), %eax |
| RETURN |
| |
| .p2align 4 |
| L(Exit12): |
| lea 11(%edi), %eax |
| RETURN |
| |
| .p2align 4 |
| L(Exit13): |
| lea 12(%edi), %eax |
| RETURN |
| |
| .p2align 4 |
| L(Exit14): |
| lea 13(%edi), %eax |
| RETURN |
| |
| .p2align 4 |
| L(Exit15): |
| lea 14(%edi), %eax |
| RETURN |
| |
| .p2align 4 |
| L(return_null): |
| xor %eax, %eax |
| RETURN |
| |
| END (strchr) |
