diff options
Diffstat (limited to 'sysdeps/powerpc/strchr.S')
| -rw-r--r-- | sysdeps/powerpc/strchr.S | 96 |
1 files changed, 48 insertions, 48 deletions
diff --git a/sysdeps/powerpc/strchr.S b/sysdeps/powerpc/strchr.S index 156d4d155c..5367a5a4fe 100644 --- a/sysdeps/powerpc/strchr.S +++ b/sysdeps/powerpc/strchr.S @@ -1,5 +1,5 @@ /* Optimized strchr implementation for PowerPC. - Copyright (C) 1997 Free Software Foundation, Inc. + Copyright (C) 1997, 1999 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -35,76 +35,76 @@ r11: a mask with the bits to ignore set to 0 r12: a temporary */ ENTRY(strchr) - rlwimi %r4,%r4,8,16,23 - li %r11,-1 - rlwimi %r4,%r4,16,0,15 - lis %r6,0xfeff - lis %r7,0x7f7f - clrrwi %r8,%r3,2 - addi %r7,%r7,0x7f7f - addi %r6,%r6,0xfffffeff - rlwinm %r10,%r3,3,27,28 + rlwimi r4,r4,8,16,23 + li r11,-1 + rlwimi r4,r4,16,0,15 + lis r6,0xfeff + lis r7,0x7f7f + clrrwi r8,r3,2 + addi r7,r7,0x7f7f + addi r6,r6,0xfffffeff + rlwinm r10,r3,3,27,28 /* Test the first (partial?) word. */ - lwz %r5,0(%r8) - srw %r11,%r11,%r10 - orc %r5,%r5,%r11 - add %r0,%r6,%r5 - nor %r9,%r7,%r5 - and. %r0,%r0,%r9 - xor %r12,%r4,%r5 - orc %r12,%r12,%r11 + lwz r5,0(r8) + srw r11,r11,r10 + orc r5,r5,r11 + add r0,r6,r5 + nor r9,r7,r5 + and. r0,r0,r9 + xor r12,r4,r5 + orc r12,r12,r11 b L(loopentry) /* The loop. */ -L(loop):lwzu %r5,4(%r8) - and. %r0,%r0,%r9 +L(loop):lwzu r5,4(r8) + and. r0,r0,r9 /* Test for 0. */ - add %r0,%r6,%r5 - nor %r9,%r7,%r5 + add r0,r6,r5 + nor r9,r7,r5 bne L(foundit) - and. %r0,%r0,%r9 + and. r0,r0,r9 /* Start test for the bytes we're looking for. */ - xor %r12,%r4,%r5 + xor r12,r4,r5 L(loopentry): - add %r0,%r6,%r12 - nor %r9,%r7,%r12 + add r0,r6,r12 + nor r9,r7,r12 beq L(loop) /* There is a zero byte in the word, but may also be a matching byte (either before or after the zero byte). In fact, we may be looking for a zero byte, in which case we return a match. We guess that this hasn't happened, though. */ L(missed): - and. %r0,%r0,%r9 - li %r3,0 + and. r0,r0,r9 + li r3,0 beqlr /* It did happen. Decide which one was first... I'm not sure if this is actually faster than a sequence of rotates, compares, and branches (we use it anyway because it's shorter). */ - and %r6,%r7,%r5 - or %r11,%r7,%r5 - and %r0,%r7,%r12 - or %r10,%r7,%r12 - add %r6,%r6,%r7 - add %r0,%r0,%r7 - nor %r5,%r11,%r6 - nor %r9,%r10,%r0 - cmplw %r5,%r9 + and r6,r7,r5 + or r11,r7,r5 + and r0,r7,r12 + or r10,r7,r12 + add r6,r6,r7 + add r0,r0,r7 + nor r5,r11,r6 + nor r9,r10,r0 + cmplw r5,r9 bgtlr - cntlzw %r4,%r9 - srwi %r4,%r4,3 - add %r3,%r8,%r4 + cntlzw r4,r9 + srwi r4,r4,3 + add r3,r8,r4 blr L(foundit): - and %r0,%r7,%r12 - or %r10,%r7,%r12 - add %r0,%r0,%r7 - nor %r9,%r10,%r0 - cntlzw %r4,%r9 - subi %r8,%r8,4 - srwi %r4,%r4,3 - add %r3,%r8,%r4 + and r0,r7,r12 + or r10,r7,r12 + add r0,r0,r7 + nor r9,r10,r0 + cntlzw r4,r9 + subi r8,r8,4 + srwi r4,r4,3 + add r3,r8,r4 blr END(strchr) |