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| author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
| commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
| tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/sparc64/lib/strlen.S | |
| download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz | |
Linux-2.6.12-rc2v2.6.12-rc2
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!
Diffstat (limited to 'arch/sparc64/lib/strlen.S')
| -rw-r--r-- | arch/sparc64/lib/strlen.S | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/arch/sparc64/lib/strlen.S b/arch/sparc64/lib/strlen.S new file mode 100644 index 000000000000..e9ba1920d818 --- /dev/null +++ b/arch/sparc64/lib/strlen.S @@ -0,0 +1,80 @@ +/* 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 |