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* sysdeps/powerpc/stpcpy.S: Define & use symbolic register names.

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Line up operands column with tabs.
2000-06-30  Greg McGary  <greg@mcgary.org>

	* sysdeps/powerpc/stpcpy.S: Define & use symbolic register names.
	Line up operands column with tabs.
This commit is contained in:
Greg McGary 2000-06-30 18:26:00 +00:00
parent 394679ebe7
commit cb2eb74250
2 changed files with 60 additions and 55 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2000-06-30 Greg McGary <greg@mcgary.org>
* sysdeps/powerpc/stpcpy.S: Define & use symbolic register names.
Line up operands column with tabs.
2000-06-30 Ulrich Drepper <drepper@redhat.com>
* elf/Makefile (LDFLAGS-origtest): Actually add it.

110
sysdeps/powerpc/stpcpy.S
View file

@ -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)