diff options
Diffstat (limited to 'arch/sparc/lib/strlen.S')
| -rw-r--r-- | arch/sparc/lib/strlen.S | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/arch/sparc/lib/strlen.S b/arch/sparc/lib/strlen.S new file mode 100644 index 000000000000..ed9a763368cd --- /dev/null +++ b/arch/sparc/lib/strlen.S | |||
| @@ -0,0 +1,81 @@ | |||
| 1 | /* strlen.S: Sparc optimized strlen code | ||
| 2 | * Hand optimized from GNU libc's strlen | ||
| 3 | * Copyright (C) 1991,1996 Free Software Foundation | ||
| 4 | * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) | ||
| 5 | * Copyright (C) 1996 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | ||
| 6 | */ | ||
| 7 | |||
| 8 | #define LO_MAGIC 0x01010101 | ||
| 9 | #define HI_MAGIC 0x80808080 | ||
| 10 | |||
| 11 | 0: | ||
| 12 | ldub [%o0], %o5 | ||
| 13 | cmp %o5, 0 | ||
| 14 | be 1f | ||
| 15 | add %o0, 1, %o0 | ||
| 16 | andcc %o0, 3, %g0 | ||
| 17 | be 4f | ||
| 18 | or %o4, %lo(HI_MAGIC), %o3 | ||
| 19 | ldub [%o0], %o5 | ||
| 20 | cmp %o5, 0 | ||
| 21 | be 2f | ||
| 22 | add %o0, 1, %o0 | ||
| 23 | andcc %o0, 3, %g0 | ||
| 24 | be 5f | ||
| 25 | sethi %hi(LO_MAGIC), %o4 | ||
| 26 | ldub [%o0], %o5 | ||
| 27 | cmp %o5, 0 | ||
| 28 | be 3f | ||
| 29 | add %o0, 1, %o0 | ||
| 30 | b 8f | ||
| 31 | or %o4, %lo(LO_MAGIC), %o2 | ||
| 32 | 1: | ||
| 33 | retl | ||
| 34 | mov 0, %o0 | ||
| 35 | 2: | ||
| 36 | retl | ||
| 37 | mov 1, %o0 | ||
| 38 | 3: | ||
| 39 | retl | ||
| 40 | mov 2, %o0 | ||
| 41 | |||
| 42 | .align 4 | ||
| 43 | .global strlen | ||
| 44 | strlen: | ||
| 45 | mov %o0, %o1 | ||
| 46 | andcc %o0, 3, %g0 | ||
| 47 | bne 0b | ||
| 48 | sethi %hi(HI_MAGIC), %o4 | ||
| 49 | or %o4, %lo(HI_MAGIC), %o3 | ||
| 50 | 4: | ||
| 51 | sethi %hi(LO_MAGIC), %o4 | ||
| 52 | 5: | ||
| 53 | or %o4, %lo(LO_MAGIC), %o2 | ||
| 54 | 8: | ||
| 55 | ld [%o0], %o5 | ||
| 56 | 2: | ||
| 57 | sub %o5, %o2, %o4 | ||
| 58 | andcc %o4, %o3, %g0 | ||
| 59 | be 8b | ||
| 60 | add %o0, 4, %o0 | ||
| 61 | |||
| 62 | /* Check every byte. */ | ||
| 63 | srl %o5, 24, %g5 | ||
| 64 | andcc %g5, 0xff, %g0 | ||
| 65 | be 1f | ||
| 66 | add %o0, -4, %o4 | ||
| 67 | srl %o5, 16, %g5 | ||
| 68 | andcc %g5, 0xff, %g0 | ||
| 69 | be 1f | ||
| 70 | add %o4, 1, %o4 | ||
| 71 | srl %o5, 8, %g5 | ||
| 72 | andcc %g5, 0xff, %g0 | ||
| 73 | be 1f | ||
| 74 | add %o4, 1, %o4 | ||
| 75 | andcc %o5, 0xff, %g0 | ||
| 76 | bne,a 2b | ||
| 77 | ld [%o0], %o5 | ||
| 78 | add %o4, 1, %o4 | ||
| 79 | 1: | ||
| 80 | retl | ||
| 81 | sub %o4, %o1, %o0 | ||