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Add Atom-optimized strchr and strrchr for x86-64
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Liubov Dmitrieva
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Ulrich Drepper
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Sep 6, 2011
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,282 @@ | ||
| /* strchr with SSE2 without bsf | ||
| Copyright (C) 2011 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, write to the Free | ||
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | ||
| 02111-1307 USA. */ | ||
|
|
||
| #ifndef NOT_IN_libc | ||
|
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||
| # include <sysdep.h> | ||
| # include "asm-syntax.h" | ||
|
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||
| .text | ||
| ENTRY (__strchr_sse2_no_bsf) | ||
| movd %esi, %xmm1 | ||
| movq %rdi, %rcx | ||
| punpcklbw %xmm1, %xmm1 | ||
| andq $~15, %rdi | ||
| pxor %xmm2, %xmm2 | ||
| punpcklbw %xmm1, %xmm1 | ||
| orl $0xffffffff, %esi | ||
| movdqa (%rdi), %xmm0 | ||
| pshufd $0, %xmm1, %xmm1 | ||
| subq %rdi, %rcx | ||
| movdqa %xmm0, %xmm3 | ||
| leaq 16(%rdi), %rdi | ||
| pcmpeqb %xmm1, %xmm0 | ||
| pcmpeqb %xmm2, %xmm3 | ||
| shl %cl, %esi | ||
| pmovmskb %xmm0, %eax | ||
| pmovmskb %xmm3, %edx | ||
| andl %esi, %eax | ||
| andl %esi, %edx | ||
| test %eax, %eax | ||
| jnz L(matches) | ||
| test %edx, %edx | ||
| jnz L(return_null) | ||
|
|
||
| L(loop): | ||
| movdqa (%rdi), %xmm0 | ||
| leaq 16(%rdi), %rdi | ||
| movdqa %xmm0, %xmm3 | ||
| pcmpeqb %xmm1, %xmm0 | ||
| pcmpeqb %xmm2, %xmm3 | ||
| pmovmskb %xmm0, %eax | ||
| pmovmskb %xmm3, %edx | ||
| or %eax, %edx | ||
| jz L(loop) | ||
|
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||
| pmovmskb %xmm3, %edx | ||
| test %eax, %eax | ||
| jnz L(matches) | ||
|
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||
| /* Return NULL. */ | ||
| .p2align 4 | ||
| L(return_null): | ||
| xor %rax, %rax | ||
| ret | ||
|
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||
| L(matches): | ||
| /* There is a match. First find where NULL is. */ | ||
| leaq -16(%rdi), %rdi | ||
| test %edx, %edx | ||
| jz L(match_case1) | ||
|
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||
| .p2align 4 | ||
| L(match_case2): | ||
| test %al, %al | ||
| jz L(match_high_case2) | ||
|
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| mov %al, %cl | ||
| and $15, %cl | ||
| jnz L(match_case2_4) | ||
|
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| mov %dl, %ch | ||
| and $15, %ch | ||
| jnz L(return_null) | ||
|
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||
| 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(%rdi), %rax | ||
| ret | ||
|
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||
| .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(%rdi), %rax | ||
| ret | ||
|
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||
| .p2align 4 | ||
| L(match_high_case2): | ||
| test %dl, %dl | ||
| jnz L(return_null) | ||
|
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||
| mov %ah, %cl | ||
| and $15, %cl | ||
| jnz L(match_case2_12) | ||
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| mov %dh, %ch | ||
| and $15, %ch | ||
| jnz L(return_null) | ||
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| 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(%rdi), %rax | ||
| ret | ||
|
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||
| .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(%rdi), %rax | ||
| ret | ||
|
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||
| .p2align 4 | ||
| L(match_case1): | ||
| test %al, %al | ||
| jz L(match_high_case1) | ||
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||
| 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(%rdi), %rax | ||
| ret | ||
|
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||
| .p2align 4 | ||
| L(match_high_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(%rdi), %rax | ||
| ret | ||
|
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| .p2align 4 | ||
| L(Exit1): | ||
| lea (%rdi), %rax | ||
| ret | ||
|
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||
| .p2align 4 | ||
| L(Exit2): | ||
| lea 1(%rdi), %rax | ||
| ret | ||
|
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||
| .p2align 4 | ||
| L(Exit3): | ||
| lea 2(%rdi), %rax | ||
| ret | ||
|
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||
| .p2align 4 | ||
| L(Exit4): | ||
| lea 3(%rdi), %rax | ||
| ret | ||
|
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| .p2align 4 | ||
| L(Exit5): | ||
| lea 4(%rdi), %rax | ||
| ret | ||
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| .p2align 4 | ||
| L(Exit6): | ||
| lea 5(%rdi), %rax | ||
| ret | ||
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| .p2align 4 | ||
| L(Exit7): | ||
| lea 6(%rdi), %rax | ||
| ret | ||
|
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| .p2align 4 | ||
| L(Exit9): | ||
| lea 8(%rdi), %rax | ||
| ret | ||
|
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| .p2align 4 | ||
| L(Exit10): | ||
| lea 9(%rdi), %rax | ||
| ret | ||
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| .p2align 4 | ||
| L(Exit11): | ||
| lea 10(%rdi), %rax | ||
| ret | ||
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| .p2align 4 | ||
| L(Exit12): | ||
| lea 11(%rdi), %rax | ||
| ret | ||
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| .p2align 4 | ||
| L(Exit13): | ||
| lea 12(%rdi), %rax | ||
| ret | ||
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| .p2align 4 | ||
| L(Exit14): | ||
| lea 13(%rdi), %rax | ||
| ret | ||
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| .p2align 4 | ||
| L(Exit15): | ||
| lea 14(%rdi), %rax | ||
| ret | ||
|
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| END (__strchr_sse2_no_bsf) | ||
| #endif | ||
|
|
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