projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 7ffe2de6 UD |
1 | /* memset/bzero -- set memory area to CH/0 |
| 2 | Highly optimized version for ix86, x>=6. | |
| 3f02f778 | 3 | Copyright (C) 1999, 2000 Free Software Foundation, Inc. |
| 7ffe2de6 | 4 | This file is part of the GNU C Library. |
| 6923133b | 5 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999. |
| 7ffe2de6 UD |
6 | |
| 7 | The GNU C Library is free software; you can redistribute it and/or | |
| 8 | modify it under the terms of the GNU Library General Public License as | |
| 9 | published by the Free Software Foundation; either version 2 of the | |
| 10 | License, or (at your option) any later version. | |
| 11 | ||
| 12 | The GNU C Library is distributed in the hope that it will be useful, | |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 15 | Library General Public License for more details. | |
| 16 | ||
| 17 | You should have received a copy of the GNU Library General Public | |
| 18 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
| 19 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
| 20 | Boston, MA 02111-1307, USA. */ | |
| 21 | ||
| 22 | #include <sysdep.h> | |
| 23 | #include "asm-syntax.h" | |
| 3f02f778 | 24 | #include "bp-asm.h" |
| 7ffe2de6 | 25 | |
| 3f02f778 GM |
26 | /* BEWARE: `#ifdef memset' means that memset is redefined as `bzero' */ |
| 27 | #define BZERO_P (defined memset) | |
| 7ffe2de6 | 28 | |
| 3f02f778 GM |
29 | #define PARMS LINKAGE+4 /* space for 1 saved reg */ |
| 30 | #if BZERO_P | |
| 31 | # define DEST PARMS | |
| 32 | # define LEN DEST+PTR_SIZE | |
| 33 | #else | |
| 34 | # define RTN PARMS | |
| 35 | # define DEST RTN+RTN_SIZE | |
| 36 | # define CHR DEST+PTR_SIZE | |
| 37 | # define LEN CHR+4 | |
| 38 | #endif | |
| 7ffe2de6 UD |
39 | |
| 40 | .text | |
| 41 | ENTRY (memset) | |
| 3f02f778 GM |
42 | ENTER |
| 43 | ||
| 7ffe2de6 UD |
44 | cld |
| 45 | pushl %edi | |
| 3f02f778 GM |
46 | movl DEST(%esp), %edx |
| 47 | movl LEN(%esp), %ecx | |
| 48 | #if BZERO_P | |
| 49 | xorl %eax, %eax /* fill with 0 */ | |
| 7ffe2de6 | 50 | #else |
| 3f02f778 | 51 | movzbl CHR(%esp), %eax |
| 7ffe2de6 UD |
52 | #endif |
| 53 | jecxz 1f | |
| 54 | movl %edx, %edi | |
| 55 | andl $3, %edx | |
| 56 | jz 2f | |
| 57 | jnp 3f | |
| 58 | stosb | |
| 59 | decl %ecx | |
| 60 | jz 1f | |
| 61 | 3: stosb | |
| 62 | decl %ecx | |
| 63 | jz 1f | |
| 64 | xorl $3, %edx | |
| 65 | jz 2f | |
| 66 | stosb | |
| 67 | decl %ecx | |
| 68 | 2: movl %ecx, %edx | |
| 69 | shrl $2, %ecx | |
| 70 | andl $3, %edx | |
| 3f02f778 | 71 | #if !BZERO_P |
| 7ffe2de6 UD |
72 | imul $0x01010101, %eax |
| 73 | #endif | |
| 74 | rep | |
| 75 | stosl | |
| 76 | movl %edx, %ecx | |
| 77 | rep | |
| 78 | stosb | |
| 79 | ||
| 6923133b | 80 | 1: |
| 3f02f778 GM |
81 | #if !BZERO_P |
| 82 | movl DEST(%esp), %eax | |
| 6923133b | 83 | #endif |
| 7ffe2de6 | 84 | popl %edi |
| 3f02f778 GM |
85 | |
| 86 | LEAVE | |
| 87 | #if BZERO_P | |
| 7ffe2de6 | 88 | ret |
| 3f02f778 GM |
89 | #else |
| 90 | RET_PTR | |
| 91 | #endif | |
| 7ffe2de6 | 92 | END (memset) |