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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/copyuser_64.S
View File

@ -24,7 +24,7 @@ _GLOBAL(__copy_tofrom_user)
dcbt 0,r4
beq .Lcopy_page_4K
andi. r6,r6,7
mtcrf 0x01,r5
PPC_MTOCRF 0x01,r5
blt cr1,.Lshort_copy
bne .Ldst_unaligned
.Ldst_aligned:
@ -135,7 +135,7 @@ _GLOBAL(__copy_tofrom_user)
b .Ldo_tail
.Ldst_unaligned:
mtcrf 0x01,r6 /* put #bytes to 8B bdry into cr7 */
PPC_MTOCRF 0x01,r6 /* put #bytes to 8B bdry into cr7 */
subf r5,r6,r5
li r7,0
cmpldi r1,r5,16
@ -150,7 +150,7 @@ _GLOBAL(__copy_tofrom_user)
2: bf cr7*4+1,3f
37: lwzx r0,r7,r4
83: stwx r0,r7,r3
3: mtcrf 0x01,r5
3: PPC_MTOCRF 0x01,r5
add r4,r6,r4
add r3,r6,r3
b .Ldst_aligned

6
arch/powerpc/lib/mem_64.S
View File

@ -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)

6
arch/powerpc/lib/memcpy_64.S
View File

@ -12,7 +12,7 @@
.align 7
_GLOBAL(memcpy)
std r3,48(r1) /* save destination pointer for return value */
mtcrf 0x01,r5
PPC_MTOCRF 0x01,r5
cmpldi cr1,r5,16
neg r6,r3 # LS 3 bits = # bytes to 8-byte dest bdry
andi. r6,r6,7
@ -128,7 +128,7 @@ _GLOBAL(memcpy)
b .Ldo_tail
.Ldst_unaligned:
mtcrf 0x01,r6 # put #bytes to 8B bdry into cr7
PPC_MTOCRF 0x01,r6 # put #bytes to 8B bdry into cr7
subf r5,r6,r5
li r7,0
cmpldi r1,r5,16
@ -143,7 +143,7 @@ _GLOBAL(memcpy)
2: bf cr7*4+1,3f
lwzx r0,r7,r4
stwx r0,r7,r3
3: mtcrf 0x01,r5
3: PPC_MTOCRF 0x01,r5
add r4,r6,r4
add r3,r6,r3
b .Ldst_aligned

10
include/asm-powerpc/asm-compat.h
View File

@ -78,6 +78,15 @@
#define PPC_STLCX stringify_in_c(stdcx.)
#define PPC_CNTLZL stringify_in_c(cntlzd)
/* Move to CR, single-entry optimized version. Only available
* on POWER4 and later.
*/
#ifdef CONFIG_POWER4_ONLY
#define PPC_MTOCRF stringify_in_c(mtocrf)
#else
#define PPC_MTOCRF stringify_in_c(mtcrf)
#endif
#else /* 32-bit */
/* operations for longs and pointers */
@ -89,6 +98,7 @@
#define PPC_LLARX stringify_in_c(lwarx)
#define PPC_STLCX stringify_in_c(stwcx.)
#define PPC_CNTLZL stringify_in_c(cntlzw)
#define PPC_MTOCRF stringify_in_c(mtcrf)
#endif