lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

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