| /* strchr SSE2 without bsf |
| Copyright (C) 2011-2014 Free Software Foundation, Inc. |
| Contributed by Intel Corporation. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef NOT_IN_libc |
| |
| # include <sysdep.h> |
| |
| # 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 |
| |
| atom_text_section |
| ENTRY (__strchr_sse2) |
| |
| 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) |
| /* Check which byte is a match. */ |
| /* Is there a NULL? */ |
| 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 |
| |
| /* Return NULL. */ |
| .p2align 4 |
| L(return_null): |
| xor %eax, %eax |
| RETURN |
| |
| END (__strchr_sse2) |
| #endif |
