Commit 5b2a32e8 authored May 19, 2015 by LEROY Christophe Committed by Scott Wood Aug 07, 2015

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 <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <scottwood@freescale.com>

parent df087e45

arch/powerpc/lib/copy_32.S

+4 −4

Original line number	Diff line number	Diff line
		@@ -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

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