diff options
| author | Michael Shalayeff <mickey@cvs.openbsd.org> | 2002-07-08 15:20:16 +0000 |
|---|---|---|
| committer | Michael Shalayeff <mickey@cvs.openbsd.org> | 2002-07-08 15:20:16 +0000 |
| commit | 50ed485ee90e432e7b61ef4ba5439790c4cc70b8 (patch) | |
| tree | 871689cf364b04f7ad530b0f46fa55cf45bfeab1 /lib/libc | |
| parent | 182ee8990a76610179be5713e65f4d84db249ba9 (diff) | |
offload the arguments from the stack before performing
the copying, initial idea is from freebsd (not fully
implemented there, apparently).
this also makes bcopy/memcpy a tiny little bit faster.
Diffstat (limited to 'lib/libc')
| -rw-r--r-- | lib/libc/arch/i386/string/bcopy.S | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/lib/libc/arch/i386/string/bcopy.S b/lib/libc/arch/i386/string/bcopy.S index 0008daea4bb..c66a4223321 100644 --- a/lib/libc/arch/i386/string/bcopy.S +++ b/lib/libc/arch/i386/string/bcopy.S @@ -1,3 +1,5 @@ +/* $OpenBSD: bcopy.S,v 1.3 2002/07/08 15:20:15 mickey Exp $ */ + /*- * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. @@ -37,7 +39,7 @@ #if defined(LIBC_SCCS) .text - .asciz "$OpenBSD: bcopy.S,v 1.2 1996/08/19 08:12:54 tholo Exp $" + .asciz "$OpenBSD: bcopy.S,v 1.3 2002/07/08 15:20:15 mickey Exp $" #endif /* @@ -59,24 +61,23 @@ ENTRY(bcopy) #if defined(MEMCOPY) || defined(MEMMOVE) movl 12(%esp),%edi movl 16(%esp),%esi + movl %edi, %eax #else movl 12(%esp),%esi movl 16(%esp),%edi #endif movl 20(%esp),%ecx + movl %ecx,%edx cmpl %esi,%edi /* potentially overlapping? */ jnb 1f cld /* nope, copy forwards. */ shrl $2,%ecx /* copy by words */ rep movsl - movl 20(%esp),%ecx + movl %edx,%ecx andl $3,%ecx /* any bytes left? */ rep movsb -#if defined(MEMCOPY) || defined(MEMMOVE) - movl 12(%esp),%eax -#endif popl %edi popl %esi ret @@ -89,15 +90,12 @@ ENTRY(bcopy) decl %esi rep movsb - movl 20(%esp),%ecx /* copy remainder by words */ + movl %edx,%ecx shrl $2,%ecx subl $3,%esi subl $3,%edi rep movsl -#if defined(MEMCOPY) || defined(MEMMOVE) - movl 12(%esp),%eax -#endif popl %edi popl %esi cld |