1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
80 lines
1.4 KiB
ArmAsm
80 lines
1.4 KiB
ArmAsm
/* strlen.S: Sparc64 optimized strlen code
|
|
* Hand optimized from GNU libc's strlen
|
|
* Copyright (C) 1991,1996 Free Software Foundation
|
|
* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
|
|
* Copyright (C) 1996, 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
|
|
*/
|
|
|
|
#define LO_MAGIC 0x01010101
|
|
#define HI_MAGIC 0x80808080
|
|
|
|
.align 32
|
|
.globl strlen
|
|
.type strlen,#function
|
|
strlen:
|
|
mov %o0, %o1
|
|
andcc %o0, 3, %g0
|
|
be,pt %icc, 9f
|
|
sethi %hi(HI_MAGIC), %o4
|
|
ldub [%o0], %o5
|
|
brz,pn %o5, 11f
|
|
add %o0, 1, %o0
|
|
andcc %o0, 3, %g0
|
|
be,pn %icc, 4f
|
|
or %o4, %lo(HI_MAGIC), %o3
|
|
ldub [%o0], %o5
|
|
brz,pn %o5, 12f
|
|
add %o0, 1, %o0
|
|
andcc %o0, 3, %g0
|
|
be,pt %icc, 5f
|
|
sethi %hi(LO_MAGIC), %o4
|
|
ldub [%o0], %o5
|
|
brz,pn %o5, 13f
|
|
add %o0, 1, %o0
|
|
ba,pt %icc, 8f
|
|
or %o4, %lo(LO_MAGIC), %o2
|
|
9:
|
|
or %o4, %lo(HI_MAGIC), %o3
|
|
4:
|
|
sethi %hi(LO_MAGIC), %o4
|
|
5:
|
|
or %o4, %lo(LO_MAGIC), %o2
|
|
8:
|
|
ld [%o0], %o5
|
|
2:
|
|
sub %o5, %o2, %o4
|
|
andcc %o4, %o3, %g0
|
|
be,pt %icc, 8b
|
|
add %o0, 4, %o0
|
|
|
|
/* Check every byte. */
|
|
srl %o5, 24, %g7
|
|
andcc %g7, 0xff, %g0
|
|
be,pn %icc, 1f
|
|
add %o0, -4, %o4
|
|
srl %o5, 16, %g7
|
|
andcc %g7, 0xff, %g0
|
|
be,pn %icc, 1f
|
|
add %o4, 1, %o4
|
|
srl %o5, 8, %g7
|
|
andcc %g7, 0xff, %g0
|
|
be,pn %icc, 1f
|
|
add %o4, 1, %o4
|
|
andcc %o5, 0xff, %g0
|
|
bne,a,pt %icc, 2b
|
|
ld [%o0], %o5
|
|
add %o4, 1, %o4
|
|
1:
|
|
retl
|
|
sub %o4, %o1, %o0
|
|
11:
|
|
retl
|
|
mov 0, %o0
|
|
12:
|
|
retl
|
|
mov 1, %o0
|
|
13:
|
|
retl
|
|
mov 2, %o0
|
|
|
|
.size strlen, .-strlen
|