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| author |   Heiko Carstens <heiko.carstens@de.ibm.com> | 2017-10-04 19:27:05 +0200 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-10-09 11:18:04 +0200 |
| commit | 0b77d6701cf8d4eb343a83fa8d7eca81a863bb7c (patch) | |
| tree | b3254583a855788629a4c50feacef807d966fbf0 /arch/s390/lib | |
| parent | Merge branch 'sthyi' into features (diff) | |
| download | linux-dev-0b77d6701cf8d4eb343a83fa8d7eca81a863bb7c.tar.xz linux-dev-0b77d6701cf8d4eb343a83fa8d7eca81a863bb7c.zip | |
s390: implement memset16, memset32 & memset64
Provide fast versions of the new memset variants. E.g. the generic
memset64 is ten times slower than the optimized version if used on a
whole page.
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')
| -rw-r--r-- | arch/s390/lib/mem.S | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/arch/s390/lib/mem.S b/arch/s390/lib/mem.S index 7ff79a4ff00c..f88cf6983849 100644 --- a/arch/s390/lib/mem.S +++ b/arch/s390/lib/mem.S @@ -126,3 +126,47 @@ ENTRY(memcpy) .Lmemcpy_mvc: mvc 0(1,%r1),0(%r3) EXPORT_SYMBOL(memcpy) + +/* + * __memset16/32/64 + * + * void *__memset16(uint16_t *s, uint16_t v, size_t count) + * void *__memset32(uint32_t *s, uint32_t v, size_t count) + * void *__memset64(uint64_t *s, uint64_t v, size_t count) + */ +.macro __MEMSET bits,bytes,insn +ENTRY(__memset\bits) + ltgr %r4,%r4 + bzr %r14 + cghi %r4,\bytes + je .L__memset_exit\bits + aghi %r4,-(\bytes+1) + srlg %r5,%r4,8 + ltgr %r5,%r5 + lgr %r1,%r2 + jz .L__memset_remainder\bits +.L__memset_loop\bits: + \insn %r3,0(%r1) + mvc \bytes(256-\bytes,%r1),0(%r1) + la %r1,256(%r1) + brctg %r5,.L__memset_loop\bits +.L__memset_remainder\bits: + \insn %r3,0(%r1) + larl %r5,.L__memset_mvc\bits + ex %r4,0(%r5) + br %r14 +.L__memset_exit\bits: + \insn %r3,0(%r2) + br %r14 +.L__memset_mvc\bits: + mvc \bytes(1,%r1),0(%r1) +.endm + +__MEMSET 16,2,sth +EXPORT_SYMBOL(__memset16) + +__MEMSET 32,4,st +EXPORT_SYMBOL(__memset32) + +__MEMSET 64,8,stg +EXPORT_SYMBOL(__memset64) |