diff options
Diffstat (limited to 'sysdeps/powerpc/strlen.s')
| -rw-r--r-- | sysdeps/powerpc/strlen.s | 104 |
1 files changed, 52 insertions, 52 deletions
diff --git a/sysdeps/powerpc/strlen.s b/sysdeps/powerpc/strlen.s index eb6a88e2b8..fa1c670912 100644 --- a/sysdeps/powerpc/strlen.s +++ b/sysdeps/powerpc/strlen.s @@ -68,78 +68,78 @@ # them, the others we must save. .section ".text" - .align 3 + .align 2 .globl strlen .type strlen,@function strlen: # On entry, r3 points to the string, and it's left that way. - # We use r6 to store 0x01010101, and r7 to store 0x7f7f7f7f. + # We use r6 to store 0xfefefeff, and r7 to store 0x7f7f7f7f. # r4 is used to keep the current index into the string; r5 holds # the number of padding bits we prepend to the string to make it # start at a word boundary. r8 holds the 'current' word. # r9-12 are temporaries. r0 is used as a temporary and for discarded # results. - clrrwi 4,3,2 - lis 6,0xfeff - lis 7,0x7f7f - rlwinm 10,3,0,29,29 - lwz 8,0(4) - addi 7,7,0x7f7f - rlwinm 5,3,3,27,28 - cmpwi 1,10,0 - li 9,-1 + 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 + li %r9,-1 # 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. - srw 9,9,5 - and 0,7,8 - or 10,7,8 - add 0,0,7 - nor 0,10,0 - and. 8,0,9 - bne done0 + srw %r9,%r9,%r5 + and %r0,%r7,%r8 + or %r10,%r7,%r8 + add %r0,%r0,%r7 + nor %r0,%r10,%r0 + and. %r8,%r0,%r9 + bne done0 # Handle second word of pair. Put addi between branches to avoid hurting # branch prediction. - addi 6,6,0xfffffeff - - bne 1,loop - lwzu 8,4(4) - and 0,7,8 - or 10,7,8 - add 0,0,7 - nor. 0,10,0 - bne done0 + addi %r6,%r6,0xfffffeff + + bne %cr1,loop + lwzu %r8,4(%r4) + and %r0,%r7,%r8 + or %r10,%r7,%r8 + add %r0,%r0,%r7 + nor. %r8,%r10,%r0 + bne done0 # The loop. + +loop: lwz %r8,4(%r4) + lwzu %r9,8(%r4) + add %r0,%r6,%r8 + nor %r10,%r7,%r8 + and. %r0,%r0,%r10 + add %r11,%r6,%r9 + nor %r12,%r7,%r9 + bne done1 + and. %r0,%r11,%r12 + beq loop -loop: lwz 8,4(4) - lwzu 9,8(4) - add 0,6,8 - nor 10,7,8 - and. 0,0,10 - add 11,6,9 - nor 12,7,9 - bne done1 - and. 0,11,12 - beq loop - - and 0,7,9 - or 10,7,9 - b done2 - -done1: addi 4,4,-4 - and 0,7,9 - or 10,7,9 -done2: add 0,0,7 - nor 0,10,0 - + and %r0,%r7,%r9 + add %r0,%r0,%r7 + andc %r8,%r12,%r0 + b done0 + +done1: and %r0,%r7,%r8 + subi %r4,%r4,4 + add %r0,%r0,%r7 + andc %r8,%r10,%r0 + # When we get to here, r4 points to the first word in the string that # contains a zero byte, and the most significant set bit in r8 is in that # byte. -done0: cntlzw 11,8 - subf 0,3,4 - srwi 11,11,3 - add 3,0,11 +done0: cntlzw %r11,%r8 + subf %r0,%r3,%r4 + srwi %r11,%r11,3 + add %r3,%r0,%r11 blr 0: .size strlen,0b-strlen |