diff options
| author | LEROY Christophe <christophe.leroy@c-s.fr> | 2015-05-19 12:07:57 +0200 |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2015-08-07 22:59:29 -0500 |
| commit | 295ffb41896f566d4bd6f93fc230f5d411d373cb (patch) | |
| tree | 8022a2cf64316b4cf6e441314fc2dd7b196f2a38 /arch/powerpc | |
| parent | 0b05e2d671c40cfb57e66e4e402320d6e056b2f8 (diff) | |
| download | op-kernel-dev-295ffb41896f566d4bd6f93fc230f5d411d373cb.zip op-kernel-dev-295ffb41896f566d4bd6f93fc230f5d411d373cb.tar.gz | |
powerpc/32: Few optimisations in memcpy
This patch adds a few optimisations in memcpy functions by using
lbzu/stbu instead of lxb/stb and by re-ordering insn inside a loop
to reduce latency due to loading
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <scottwood@freescale.com>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/lib/copy_32.S | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/arch/powerpc/lib/copy_32.S b/arch/powerpc/lib/copy_32.S index 1d49c74..2ef50c6 100644 --- a/arch/powerpc/lib/copy_32.S +++ b/arch/powerpc/lib/copy_32.S @@ -155,9 +155,9 @@ _GLOBAL(memcpy) mtctr r8 beq+ 61f 70: lbz r9,4(r4) /* do some bytes */ - stb r9,4(r6) addi r4,r4,1 addi r6,r6,1 + stb r9,3(r6) bdnz 70b 61: srwi. r0,r0,2 mtctr r0 @@ -199,10 +199,10 @@ _GLOBAL(memcpy) 64: andi. r0,r5,3 mtctr r0 beq+ 65f -40: lbz r0,4(r4) - stb r0,4(r6) - addi r4,r4,1 - addi r6,r6,1 + addi r4,r4,3 + addi r6,r6,3 +40: lbzu r0,1(r4) + stbu r0,1(r6) bdnz 40b 65: blr |
