| 1 | /* Highly optimized version for ix86, x>=6. |
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| 2 | Copyright (C) 1999-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <sysdep.h> |
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| 20 | #include "asm-syntax.h" |
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| 21 | |
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| 22 | #define PARMS 4 /* no space for saved regs */ |
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| 23 | #define STR1 PARMS |
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| 24 | #define STR2 STR1+4 |
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| 25 | |
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| 26 | .text |
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| 27 | ENTRY (strcmp) |
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| 28 | |
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| 29 | movl STR1(%esp), %ecx |
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| 30 | movl STR2(%esp), %edx |
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| 31 | |
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| 32 | L(oop): movb (%ecx), %al |
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| 33 | cmpb (%edx), %al |
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| 34 | jne L(neq) |
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| 35 | incl %ecx |
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| 36 | incl %edx |
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| 37 | testb %al, %al |
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| 38 | jnz L(oop) |
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| 39 | |
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| 40 | xorl %eax, %eax |
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| 41 | /* when strings are equal, pointers rest one beyond |
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| 42 | the end of the NUL terminators. */ |
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| 43 | ret |
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| 44 | |
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| 45 | L(neq): movl $1, %eax |
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| 46 | movl $-1, %ecx |
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| 47 | cmovbl %ecx, %eax |
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| 48 | |
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| 49 | ret |
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| 50 | END (strcmp) |
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| 51 | libc_hidden_builtin_def (strcmp) |
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| 52 | |
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