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Date: Tue, 19 May 2015 12:07:57 +0200 (CEST) From: Christophe Leroy <christophe.leroy@....fr> To: Benjamin Herrenschmidt <benh@...nel.crashing.org>, Paul Mackerras <paulus@...ba.org>, Michael Ellerman <mpe@...erman.id.au>, scottwood@...escale.com Cc: linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, Joakim Tjernlund <joakim.tjernlund@...nsmode.se> Subject: [PATCH v2 6/6] powerpc32: 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@....fr> --- arch/powerpc/lib/copy_32.S | 10 +++++----- 1 file 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 -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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