diff options
Diffstat (limited to 'sysdeps/i386/i686/memset.S')
| -rw-r--r-- | sysdeps/i386/i686/memset.S | 47 |
1 files changed, 30 insertions, 17 deletions
diff --git a/sysdeps/i386/i686/memset.S b/sysdeps/i386/i686/memset.S index 83f8c50484..74ce87bfc7 100644 --- a/sysdeps/i386/i686/memset.S +++ b/sysdeps/i386/i686/memset.S @@ -1,6 +1,6 @@ /* memset/bzero -- set memory area to CH/0 Highly optimized version for ix86, x>=6. - Copyright (C) 1999 Free Software Foundation, Inc. + Copyright (C) 1999, 2000 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999. @@ -21,27 +21,34 @@ #include <sysdep.h> #include "asm-syntax.h" +#include "bp-asm.h" -/* - INPUT PARAMETERS: - (memset) (bzero) - dst (sp + 4) dst (sp + 4) - ch (sp + 8) len (sp + 8) - len (sp + 12) -*/ +/* BEWARE: `#ifdef memset' means that memset is redefined as `bzero' */ +#define BZERO_P (defined memset) +#define PARMS LINKAGE+4 /* space for 1 saved reg */ +#if BZERO_P +# define DEST PARMS +# define LEN DEST+PTR_SIZE +#else +# define RTN PARMS +# define DEST RTN+RTN_SIZE +# define CHR DEST+PTR_SIZE +# define LEN CHR+4 +#endif .text ENTRY (memset) + ENTER + cld pushl %edi - movl 8(%esp), %edx -#ifdef memset - movl 12(%esp), %ecx - xorl %eax, %eax + movl DEST(%esp), %edx + movl LEN(%esp), %ecx +#if BZERO_P + xorl %eax, %eax /* fill with 0 */ #else - movzbl 12(%esp), %eax - movl 16(%esp), %ecx + movzbl CHR(%esp), %eax #endif jecxz 1f movl %edx, %edi @@ -61,7 +68,7 @@ ENTRY (memset) 2: movl %ecx, %edx shrl $2, %ecx andl $3, %edx -#ifndef memset +#if !BZERO_P imul $0x01010101, %eax #endif rep @@ -71,9 +78,15 @@ ENTRY (memset) stosb 1: -#ifndef memset - movl 8(%esp), %eax +#if !BZERO_P + movl DEST(%esp), %eax #endif popl %edi + + LEAVE +#if BZERO_P ret +#else + RET_PTR +#endif END (memset) |