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[POWERPC] Use mtocrf instruction in asm when CONFIG_POWER4_ONLY=y

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mtocrf is a faster single-field mtcrf (move to condition register
fields) instruction available in POWER4 and later processors.  It can
make quite a difference in performance on some implementations, so use
it for CONFIG_POWER4_ONLY builds.

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Olof Johansson
2007-03-22 09:34:13 -05:00
committed by Paul Mackerras
parent 569975591c
commit 3467bfd340
4 changed files with 19 additions and 9 deletions
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6
arch/powerpc/lib/mem_64.S
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@@ -19,7 +19,7 @@ _GLOBAL(memset)
rlwimi r4,r4,16,0,15
cmplw cr1,r5,r0 /* do we get that far? */
rldimi r4,r4,32,0
mtcrf 1,r0
PPC_MTOCRF 1,r0
mr r6,r3
blt cr1,8f
beq+ 3f /* if already 8-byte aligned */
@@ -49,7 +49,7 @@ _GLOBAL(memset)
bdnz 4b
5: srwi. r0,r5,3
clrlwi r5,r5,29
mtcrf 1,r0
PPC_MTOCRF 1,r0
beq 8f
bf 29,6f
std r4,0(r6)
@@ -65,7 +65,7 @@ _GLOBAL(memset)
std r4,0(r6)
addi r6,r6,8
8: cmpwi r5,0
mtcrf 1,r5
PPC_MTOCRF 1,r5
beqlr+
bf 29,9f
stw r4,0(r6)