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powerpc/string: Implement optimized memset variants

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Based on Matthew Wilcox's patches for other architectures.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Naveen N. Rao
2017-03-28 01:07:40 +05:30
committed by Michael Ellerman
parent 00e7c259e9
commit 694fc88ce2
2 changed files with 42 additions and 1 deletions
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19
arch/powerpc/lib/mem_64.S
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@@ -13,6 +13,23 @@
#include <asm/ppc_asm.h>
#include <asm/export.h>
_GLOBAL(__memset16)
rlwimi r4,r4,16,0,15
/* fall through */
_GLOBAL(__memset32)
rldimi r4,r4,32,0
/* fall through */
_GLOBAL(__memset64)
neg r0,r3
andi. r0,r0,7
cmplw cr1,r5,r0
b .Lms
EXPORT_SYMBOL(__memset16)
EXPORT_SYMBOL(__memset32)
EXPORT_SYMBOL(__memset64)
_GLOBAL(memset)
neg r0,r3
rlwimi r4,r4,8,16,23
@@ -20,7 +37,7 @@ _GLOBAL(memset)
rlwimi r4,r4,16,0,15
cmplw cr1,r5,r0 /* do we get that far? */
rldimi r4,r4,32,0
PPC_MTOCRF(1,r0)
.Lms: PPC_MTOCRF(1,r0)
mr r6,r3
blt cr1,8f
beq+ 3f /* if already 8-byte aligned */