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s390/lib: improve memmove, memset and memcpy

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Improve the memmove implementation to save one instruction and use
better label names. Also use better label names for the memset and
memcpy implementations so everything looks consistent.

Suggested-by: Jens Remus <jremus@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2016-12-15 08:35:10 +01:00 committed by Martin Schwidefsky
parent e3850ecfc1
commit 551f413434
1 changed files with 13 additions and 15 deletions
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28
arch/s390/lib/mem.S
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@ -14,31 +14,29 @@ ENTRY(memmove)
ltgr %r4,%r4
lgr %r1,%r2
bzr %r14
aghi %r4,-1
clgr %r2,%r3
jnh .Lmemmove_forward
la %r5,0(%r4,%r3)
la %r5,1(%r4,%r3)
clgr %r2,%r5
jl .Lmemmove_reverse
.Lmemmove_forward:
aghi %r4,-1
srlg %r0,%r4,8
ltgr %r0,%r0
jz .Lmemmove_rest
.Lmemmove_loop:
jz .Lmemmove_forward_remainder
.Lmemmove_forward_loop:
mvc 0(256,%r1),0(%r3)
la %r1,256(%r1)
la %r3,256(%r3)
brctg %r0,.Lmemmove_loop
.Lmemmove_rest:
brctg %r0,.Lmemmove_forward_loop
.Lmemmove_forward_remainder:
larl %r5,.Lmemmove_mvc
ex %r4,0(%r5)
br %r14
.Lmemmove_reverse:
aghi %r4,-1
.Lmemmove_reverse_loop:
ic %r0,0(%r4,%r3)
stc %r0,0(%r4,%r1)
brctg %r4,.Lmemmove_reverse_loop
brctg %r4,.Lmemmove_reverse
ic %r0,0(%r4,%r3)
stc %r0,0(%r4,%r1)
br %r14
@ -70,12 +68,12 @@ ENTRY(memset)
srlg %r3,%r4,8
ltgr %r3,%r3
lgr %r1,%r2
jz .Lmemset_clear_rest
jz .Lmemset_clear_remainder
.Lmemset_clear_loop:
xc 0(256,%r1),0(%r1)
la %r1,256(%r1)
brctg %r3,.Lmemset_clear_loop
.Lmemset_clear_rest:
.Lmemset_clear_remainder:
larl %r3,.Lmemset_xc
ex %r4,0(%r3)
br %r14
@ -87,12 +85,12 @@ ENTRY(memset)
aghi %r4,-2
srlg %r3,%r4,8
ltgr %r3,%r3
jz .Lmemset_fill_rest
jz .Lmemset_fill_remainder
.Lmemset_fill_loop:
mvc 1(256,%r1),0(%r1)
la %r1,256(%r1)
brctg %r3,.Lmemset_fill_loop
.Lmemset_fill_rest:
.Lmemset_fill_remainder:
larl %r3,.Lmemset_mvc
ex %r4,0(%r3)
br %r14
@ -115,7 +113,7 @@ ENTRY(memcpy)
ltgr %r5,%r5
lgr %r1,%r2
jnz .Lmemcpy_loop
.Lmemcpy_rest:
.Lmemcpy_remainder:
larl %r5,.Lmemcpy_mvc
ex %r4,0(%r5)
br %r14
@ -124,7 +122,7 @@ ENTRY(memcpy)
la %r1,256(%r1)
la %r3,256(%r3)
brctg %r5,.Lmemcpy_loop
j .Lmemcpy_rest
j .Lmemcpy_remainder
.Lmemcpy_mvc:
mvc 0(1,%r1),0(%r3)
EXPORT_SYMBOL(memcpy)