diff options
Diffstat (limited to 'sysdeps/powerpc/stpcpy.S')
| -rw-r--r-- | sysdeps/powerpc/stpcpy.S | 110 |
1 files changed, 55 insertions, 55 deletions
diff --git a/sysdeps/powerpc/stpcpy.S b/sysdeps/powerpc/stpcpy.S index eaea26b44b..2dcae0738d 100644 --- a/sysdeps/powerpc/stpcpy.S +++ b/sysdeps/powerpc/stpcpy.S @@ -21,80 +21,80 @@ /* See strlen.s for comments on how the end-of-string testing works. */ -EALIGN(__stpcpy,4,0) /* char * [r3] stpcpy (char *dest [r3], const char *src [r4]) */ -/* General register assignments: - r0: temporary - r3: pointer to previous word in dest - r4: pointer to previous word in src - r6: current word from src - r7: 0xfefefeff - r8: 0x7f7f7f7f - r9: ~(word in src | 0x7f7f7f7f) - r10: alternate word from src. */ +EALIGN (__stpcpy, 4, 0) - or r0,r4,r3 - clrlwi. r0,r0,30 - addi r3,r3,-4 - bne L(unaligned) +#define rTMP r0 +#define rDEST r3 /* pointer to previous word in dest */ +#define rSRC r4 /* pointer to previous word in src */ +#define rWORD r6 /* current word from src */ +#define rFEFE r7 /* 0xfefefeff */ +#define r7F7F r8 /* 0x7f7f7f7f */ +#define rNEG r9 /* ~(word in src | 0x7f7f7f7f) */ +#define rALT r10 /* alternate word from src */ - lis r7,0xfeff - lis r8,0x7f7f - lwz r6,0(r4) - addi r7,r7,-0x101 - addi r8,r8,0x7f7f - b L(g2) + or rTMP, rSRC, rDEST + clrlwi. rTMP, rTMP, 30 + addi rDEST, rDEST, -4 + bne L(unaligned) -L(g0): lwzu r10,4(r4) - stwu r6,4(r3) - add r0,r7,r10 - nor r9,r8,r10 - and. r0,r0,r9 - bne- L(g1) - lwzu r6,4(r4) - stwu r10,4(r3) -L(g2): add r0,r7,r6 - nor r9,r8,r6 - and. r0,r0,r9 - beq+ L(g0) + lis rFEFE, -0x101 + lis r7F7F, 0x7f7f + lwz rWORD, 0(rSRC) + addi rFEFE, rFEFE, -0x101 + addi r7F7F, r7F7F, 0x7f7f + b L(g2) - mr r10,r6 +L(g0): lwzu rALT, 4(rSRC) + stwu rWORD, 4(rDEST) + add rTMP, rFEFE, rALT + nor rNEG, r7F7F, rALT + and. rTMP, rTMP, rNEG + bne- L(g1) + lwzu rWORD, 4(rSRC) + stwu rALT, 4(rDEST) +L(g2): add rTMP, rFEFE, rWORD + nor rNEG, r7F7F, rWORD + and. rTMP, rTMP, rNEG + beq+ L(g0) + + mr rALT, rWORD /* We've hit the end of the string. Do the rest byte-by-byte. */ -L(g1): rlwinm. r0,r10,8,24,31 - stbu r0,4(r3) +L(g1): rlwinm. rTMP, rALT, 8, 24, 31 + stbu rTMP, 4(rDEST) beqlr- - rlwinm. r0,r10,16,24,31 - stbu r0,1(r3) + rlwinm. rTMP, rALT, 16, 24, 31 + stbu rTMP, 1(rDEST) beqlr- - rlwinm. r0,r10,24,24,31 - stbu r0,1(r3) + rlwinm. rTMP, rALT, 24, 24, 31 + stbu rTMP, 1(rDEST) beqlr- - stbu r10,1(r3) + stbu rALT, 1(rDEST) blr /* Oh well. In this case, we just do a byte-by-byte copy. */ .align 4 nop L(unaligned): - lbz r6,0(r4) - addi r3,r3,3 - cmpwi r6,0 - beq- L(u2) + lbz rWORD, 0(rSRC) + addi rDEST, rDEST, 3 + cmpwi rWORD, 0 + beq- L(u2) -L(u0): lbzu r10,1(r4) - stbu r6,1(r3) - cmpwi r10,0 - beq- L(u1) +L(u0): lbzu rALT, 1(rSRC) + stbu rWORD, 1(rDEST) + cmpwi rALT, 0 + beq- L(u1) nop /* Let 601 load start of loop. */ - lbzu r6,1(r4) - stbu r10,1(r3) - cmpwi r6,0 - bne+ L(u0) -L(u2): stbu r6,1(r3) + lbzu rWORD, 1(rSRC) + stbu rALT, 1(rDEST) + cmpwi rWORD, 0 + bne+ L(u0) +L(u2): stbu rWORD, 1(rDEST) blr -L(u1): stbu r10,1(r3) +L(u1): stbu rALT, 1(rDEST) blr -END(__stpcpy) +END (__stpcpy) weak_alias (__stpcpy, stpcpy) |