linux-kernel - [PATCH v8 22/23] powerpc32: small optimisation in flush_icache

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Message-Id: <b1653dc55ba88a19f9fcd7705ffb36e7e751b6b0.1455032446.git.christophe.leroy@c-s.fr>
Date:	Tue,  9 Feb 2016 17:08:31 +0100 (CET)
From:	Christophe Leroy <christophe.leroy@....fr>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Scott Wood <oss@...error.net>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v8 22/23] powerpc32: small optimisation in
 flush_icache_range()

Inlining of _dcache_range() functions has shown that the compiler
does the same thing a bit better with one insn less

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
v2: new
v3: no change
v4: no change
v5: no change
v6: no change
v8: no change

 arch/powerpc/kernel/misc_32.S | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S
index 09e1e5d..3ec5a22 100644
--- a/arch/powerpc/kernel/misc_32.S
+++ b/arch/powerpc/kernel/misc_32.S
@@ -348,10 +348,9 @@ BEGIN_FTR_SECTION
 	PURGE_PREFETCHED_INS
 	blr				/* for 601, do nothing */
 END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE)
-	li	r5,L1_CACHE_BYTES-1
-	andc	r3,r3,r5
+	rlwinm	r3,r3,0,0,31 - L1_CACHE_SHIFT
 	subf	r4,r3,r4
-	add	r4,r4,r5
+	addi	r4,r4,L1_CACHE_BYTES - 1
 	srwi.	r4,r4,L1_CACHE_SHIFT
 	beqlr
 	mtctr	r4
-- 
2.1.0