diff options
| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2016-12-15 08:35:10 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-01-16 07:27:51 +0100 |
| commit | 551f413434737a2a570af4555b4139898568ed57 (patch) | |
| tree | 4dbd266193258c22ca5755b2561acc55008339d8 /arch/s390/lib/mem.S | |
| parent | e3850ecfc17ea8e23c02368a24fc23be129fb3b0 (diff) | |
| download | linux-stable-551f413434737a2a570af4555b4139898568ed57.tar.gz linux-stable-551f413434737a2a570af4555b4139898568ed57.tar.bz2 linux-stable-551f413434737a2a570af4555b4139898568ed57.zip | |
s390/lib: improve memmove, memset and memcpy
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>
Diffstat (limited to 'arch/s390/lib/mem.S')
| -rw-r--r-- | arch/s390/lib/mem.S | 28 |
1 files changed, 13 insertions, 15 deletions
diff --git a/arch/s390/lib/mem.S b/arch/s390/lib/mem.S index 7422a706f310..7ff79a4ff00c 100644 --- a/arch/s390/lib/mem.S +++ b/arch/s390/lib/mem.S @@ -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) |