tequilaOS/platform_bionic
2
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Merge "Remove the unused swab.S."

Browse source
This commit is contained in:
Elliott Hughes 2014-07-23 03:27:59 +00:00 committed by Gerrit Code Review
commit e26ac7f776
1 changed files with 0 additions and 68 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

68
libc/arch-x86/generic/string/swab.S
View file

@ -1,68 +0,0 @@
/* $OpenBSD: swab.S,v 1.3 2005/08/07 11:30:38 espie Exp $ */
/*
* Written by J.T. Conklin <jtc@netbsd.org>.
* Public domain.
*/
#include <private/bionic_asm.h>
/*
* On the i486, this code is negligibly faster than the code generated
* by gcc at about half the size. If my i386 databook is correct, it
* should be considerably faster than the gcc code on a i386.
*/
ENTRY(swab)
pushl %esi
pushl %edi
movl 12(%esp),%esi
movl 16(%esp),%edi
movl 20(%esp),%ecx
cld # set direction forward
shrl $1,%ecx
testl $7,%ecx # copy first group of 1 to 7 words
jz L2 # while swaping alternate bytes.
.align 2,0x90
L1: lodsw
rorw $8,%ax
stosw
decl %ecx
testl $7,%ecx
jnz L1
L2: shrl $3,%ecx # copy remainder 8 words at a time
jz L4 # while swapping alternate bytes.
.align 2,0x90
L3: lodsw
rorw $8,%ax
stosw
lodsw
rorw $8,%ax
stosw
lodsw
rorw $8,%ax
stosw
lodsw
rorw $8,%ax
stosw
lodsw
rorw $8,%ax
stosw
lodsw
rorw $8,%ax
stosw
lodsw
rorw $8,%ax
stosw
lodsw
rorw $8,%ax
stosw
decl %ecx
jnz L3
L4: popl %edi
popl %esi
ret
END(swab)