qiurui
/
glibc
mirror of git://sourceware.org/git/glibc.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Shorten x86-64 strlen a bit.

This commit is contained in:
Ulrich Drepper 2010-08-26 22:12:16 -07:00
parent 623aac7f84
commit 107b2fa56c
1 changed files with 3 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
sysdeps/x86_64/strlen.S
View File

@ -1,7 +1,6 @@
/* strlen(str) -- determine the length of the string STR. /* strlen(str) -- determine the length of the string STR.
Copyright (C) 2009, 2010 Free Software Foundation, Inc. Copyright (C) 2009, 2010 Free Software Foundation, Inc.
Contributed by Ulrich Drepper <drepper@redhat.com>. Contributed by Ulrich Drepper <drepper@redhat.com>.
Modified by Intel Corporation.
This file is part of the GNU C Library. This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or The GNU C Library is free software; you can redistribute it and/or
@ -85,22 +84,19 @@ L(exit_less16):
L(exit16): L(exit16):
sub %rdi, %rax sub %rdi, %rax
bsf %rdx, %rdx bsf %rdx, %rdx
add %rdx, %rax lea 16(%rdx), %rax
add $16, %rax
ret ret
.p2align 4 .p2align 4
L(exit32): L(exit32):
sub %rdi, %rax sub %rdi, %rax
bsf %rdx, %rdx bsf %rdx, %rdx
add %rdx, %rax lea 32(%rdx), %rax
add $32, %rax
ret ret
.p2align 4 .p2align 4
L(exit48): L(exit48):
sub %rdi, %rax sub %rdi, %rax
bsf %rdx, %rdx bsf %rdx, %rdx
add %rdx, %rax lea 48(%rdx), %rax
add $48, %rax
ret ret
END(strlen) END(strlen)
libc_hidden_builtin_def (strlen) libc_hidden_builtin_def (strlen)