From 5b2a32e806342f237f68435a50e1071f7f32b5c5 Mon Sep 17 00:00:00 2001 From: LEROY Christophe Date: Tue, 19 May 2015 12:07:50 +0200 Subject: [PATCH] powerpc/32: memset(0): use cacheable_memzero cacheable_memzero uses dcbz instruction and is more efficient than memset(0) when the destination is in RAM This patch renames memset as generic_memset, and defines memset as a prolog to cacheable_memzero. This prolog checks if the byte to set is 0. If not, it falls back to generic_memcpy() cacheable_memzero disappears as it is not referenced anywhere anymore Signed-off-by: Christophe Leroy Signed-off-by: Scott Wood --- arch/powerpc/lib/copy_32.S | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/powerpc/lib/copy_32.S b/arch/powerpc/lib/copy_32.S index 55f19f9fd708..0b4f954961bf 100644 --- a/arch/powerpc/lib/copy_32.S +++ b/arch/powerpc/lib/copy_32.S @@ -74,9 +74,9 @@ CACHELINE_MASK = (L1_CACHE_BYTES-1) * to set them to zero. This requires that the destination * area is cacheable. -- paulus */ -_GLOBAL(cacheable_memzero) - mr r5,r4 - li r4,0 +_GLOBAL(memset) + cmplwi r4,0 + bne- generic_memset addi r6,r3,-4 cmplwi 0,r5,4 blt 7f @@ -117,7 +117,7 @@ _GLOBAL(cacheable_memzero) bdnz 8b blr -_GLOBAL(memset) +_GLOBAL(generic_memset) rlwimi r4,r4,8,16,23 rlwimi r4,r4,16,0,15 addi r6,r3,-4 -- 2.39.5