diff options
Diffstat (limited to 'sysdeps/powerpc/strlen.s')
| -rw-r--r-- | sysdeps/powerpc/strlen.s | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/sysdeps/powerpc/strlen.s b/sysdeps/powerpc/strlen.s index 9d671cabc3..ea809772eb 100644 --- a/sysdeps/powerpc/strlen.s +++ b/sysdeps/powerpc/strlen.s @@ -61,8 +61,8 @@ # Some notes on register usage: Under the SVR4 ABI, we can use registers # 0 and 3 through 12 (so long as we don't call any procedures) without # saving them. We can also use registers 14 through 31 if we save them. - # We can't use r1 (it's the stack pointer), nor r2 or r13 because the user - # program may expect them to be hold their usual value if we get sent + # We can't use r1 (it's the stack pointer), r2 nor r13 because the user + # program may expect them to hold their usual value if we get sent # a signal. Integer parameters are passed in r3 through r10. # We can use condition registers cr0, cr1, cr5, cr6, and cr7 without saving # them, the others we must save. @@ -80,14 +80,11 @@ strlen: # r9-12 are temporaries. r0 is used as a temporary and for discarded # results. clrrwi %r4,%r3,2 - lis %r6,0xfeff lis %r7,0x7f7f - rlwinm %r10,%r3,0,29,29 - lwz %r8,0(%r4) - addi %r7,%r7,0x7f7f rlwinm %r5,%r3,3,27,28 - cmpwi %cr1,%r10,0 + lwz %r8,0(%r4) li %r9,-1 + addi %r7,%r7,0x7f7f # That's the setup done, now do the first pair of words. # We make an exception and use method (2) on the first two words, to reduce # overhead. @@ -97,12 +94,14 @@ strlen: add %r0,%r0,%r7 nor %r0,%r10,%r0 and. %r8,%r0,%r9 + mtcrf 0x01,%r3 bne done0 - # Handle second word of pair. Put addi between branches to avoid hurting - # branch prediction. + lis %r6,0xfeff addi %r6,%r6,-0x101 + # Are we now aligned to a doubleword boundary? + bt 29,loop - bne %cr1,loop + # Handle second word of pair. lwzu %r8,4(%r4) and %r0,%r7,%r8 or %r10,%r7,%r8 |