linux-kernel - [PATCH v2 3/5] powerpc/lib: optimise PPC32 memcmp

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <0bb218e986cc117099c3900709adfd2f2ac97c41.1526553552.git.christophe.leroy@c-s.fr>
Date:   Thu, 17 May 2018 12:49:54 +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>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v2 3/5] powerpc/lib: optimise PPC32 memcmp

At the time being, memcmp() compares two chunks of memory
byte per byte.

This patch optimises the comparison by comparing word by word.

A small benchmark performed on an 8xx comparing two chuncks
of 512 bytes performed 100000 times gives:

Before : 5852274 TB ticks
After:   1488638 TB ticks

This is almost 4 times faster

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 arch/powerpc/lib/string_32.S | 42 +++++++++++++++++++++++++++++++++++-------
 1 file changed, 35 insertions(+), 7 deletions(-)

diff --git a/arch/powerpc/lib/string_32.S b/arch/powerpc/lib/string_32.S
index 2c11c2019b69..5c0e77baa9c7 100644
--- a/arch/powerpc/lib/string_32.S
+++ b/arch/powerpc/lib/string_32.S
@@ -20,13 +20,41 @@
 _GLOBAL(memcmp)
 	PPC_LCMPI 0,r5,0
 	beq-	2f
-	mtctr	r5
-	addi	r6,r3,-1
-	addi	r4,r4,-1
-1:	lbzu	r3,1(r6)
-	lbzu	r0,1(r4)
-	subf.	r3,r0,r3
-	bdnzt	2,1b
+	srawi.	r7, r5, 2		/* Divide len by 4 */
+	mr	r6, r3
+	beq-	3f
+	mtctr	r7
+	li	r7, 0
+1:
+#ifdef __LITTLE_ENDIAN__
+	lwbrx	r3, r6, r7
+	lwbrx	r0, r4, r7
+#else
+	lwzx	r3, r6, r7
+	lwzx	r0, r4, r7
+#endif
+	addi	r7, r7, 4
+	subf.	r3, r0, r3
+	bdnzt	eq, 1b
+	bnelr
+	andi.	r5, r5, 3
+	beqlr
+3:	cmplwi	cr1, r5, 2
+	blt-	cr1, 4f
+#ifdef __LITTLE_ENDIAN__
+	lhbrx	r3, r6, r7
+	lhbrx	r0, r4, r7
+#else
+	lhzx	r3, r6, r7
+	lhzx	r0, r4, r7
+#endif
+	addi	r7, r7, 2
+	subf.	r3, r0, r3
+	beqlr	cr1
+	bnelr
+4:	lbzx	r3, r6, r7
+	lbzx	r0, r4, r7
+	subf.	r3, r0, r3
 	blr
 2:	li	r3,0
 	blr
-- 
2.13.3