diff options
| author | Thomas Schwinge <thomas@codesourcery.com> | 2013-12-20 09:29:29 +0100 |
|---|---|---|
| committer | Thomas Schwinge <thomas@codesourcery.com> | 2013-12-20 09:29:29 +0100 |
| commit | a65dd355fb80a05215e15ae97649de52aec885e3 (patch) | |
| tree | 81701bb0c6b648630f2bf1729a85d7f5eb49e67b /sysdeps/powerpc/powerpc32/power7/strlen.S | |
| parent | 296a5732f94abe4d5699dc981e4ccfb950b48cee (diff) | |
| parent | b4578bab30f72cddd2cf38abfb39f9c8dc892249 (diff) | |
Merge branch 'baseline' into refs/top-bases/tschwinge/Roger_Whittaker
Diffstat (limited to 'sysdeps/powerpc/powerpc32/power7/strlen.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc32/power7/strlen.S | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/sysdeps/powerpc/powerpc32/power7/strlen.S b/sysdeps/powerpc/powerpc32/power7/strlen.S index b71a10f5c7..b08d6c028c 100644 --- a/sysdeps/powerpc/powerpc32/power7/strlen.S +++ b/sysdeps/powerpc/powerpc32/power7/strlen.S @@ -29,7 +29,11 @@ ENTRY (strlen) li r0,0 /* Word with null chars to use with cmpb. */ li r5,-1 /* MASK = 0xffffffffffffffff. */ lwz r12,0(r4) /* Load word from memory. */ +#ifdef __LITTLE_ENDIAN__ + slw r5,r5,r6 +#else srw r5,r5,r6 /* MASK = MASK >> padding. */ +#endif orc r9,r12,r5 /* Mask bits that are not part of the string. */ cmpb r10,r9,r0 /* Check for null bytes in WORD1. */ cmpwi cr7,r10,0 /* If r10 == 0, no null's have been found. */ @@ -47,9 +51,6 @@ ENTRY (strlen) cmpb r10,r12,r0 cmpwi cr7,r10,0 bne cr7,L(done) - b L(loop) /* We branch here (rather than falling through) - to skip the nops due to heavy alignment - of the loop below. */ /* Main loop to look for the end of the string. Since it's a small loop (< 8 instructions), align it to 32-bytes. */ @@ -86,9 +87,15 @@ L(loop): 0xff in the same position as the null byte in the original word from the string. Use that to calculate the length. */ L(done): - cntlzw r0,r10 /* Count leading zeroes before the match. */ +#ifdef __LITTLE_ENDIAN__ + addi r9, r10, -1 /* Form a mask from trailing zeros. */ + andc r9, r9, r10 + popcntw r0, r9 /* Count the bits in the mask. */ +#else + cntlzw r0,r10 /* Count leading zeros before the match. */ +#endif subf r5,r3,r4 - srwi r0,r0,3 /* Convert leading zeroes to bytes. */ + srwi r0,r0,3 /* Convert leading zeros to bytes. */ add r3,r5,r0 /* Compute final length. */ blr END (strlen) |