From 8e0558e3df46436fe398abe89e80b1c38c837fc1 Mon Sep 17 00:00:00 2001
From: Bernhard Urban <lewurm@gmail.com>
Date: Sun, 7 Mar 2010 13:55:25 +0100
Subject: [PATCH] asmb: hint von martin perner (btr statt cmp/sub) und
 gistupdate von ihm

---
 asmb/asmb.s     | 40 ++++++++++++++++------------------------
 asmb/asmbtest.c |  6 ++++--
 2 files changed, 20 insertions(+), 26 deletions(-)

diff --git a/asmb/asmb.s b/asmb/asmb.s
index e94d189..540a28f 100644
--- a/asmb/asmb.s
+++ b/asmb/asmb.s
@@ -81,52 +81,44 @@ asmb:
 	//hint: in %xmm15 ist differenz gespeichert (vgl .differenz)
 
 	//leider shiften nur mit immediate! :(
-	cmp $8, %r11d
-	jc .rechtsshift1
+	btr $3, %r11d
+	jnc .rechtsshift1
 	psrldq $8, %xmm15
-	sub $8, %r11d
 
 .rechtsshift1:
-	cmp $4, %r11d
-	jc .rechtsshift2
+	btr $2, %r11d
+	jnc .rechtsshift2
 	psrldq $4, %xmm15
-	sub $4, %r11d
 
 .rechtsshift2:
-	cmp $2, %r11d
-	jc .rechtsshift3
+	btr $1, %r11d
+	jnc .rechtsshift3
 	psrldq $2, %xmm15
-	sub $2, %r11d
 
 .rechtsshift3:
-	cmp $1, %r11d
-	jc .linksshift
+	btr $0, %r11d
+	jnc .linksshift
 	psrldq $1, %xmm15
-	sub $1, %r11d
 #==================
 .linksshift:
-	cmp $8, %ecx
-	jc .linksshift1
+	btr $3, %ecx
+	jnc .linksshift1
 	pslldq $8, %xmm15
-	sub $8, %ecx
 
 .linksshift1:
-	cmp $4, %ecx
-	jc .linksshift2
+	btr $2, %ecx
+	jnc .linksshift2
 	pslldq $4, %xmm15
-	sub $4, %ecx
 
 .linksshift2:
-	cmp $2, %ecx
-	jc .linksshift3
+	btr $1, %ecx
+	jnc .linksshift3
 	pslldq $2, %xmm15
-	sub $2, %ecx
 
 .linksshift3:
-	cmp $1, %ecx
-	jc .endshift
+	btr $0, %ecx
+	jnc .endshift
 	pslldq $1, %xmm15
-	sub $1, %ecx
 
 .endshift:
 	//betreffende speicherstelle in %xmm11 laden
diff --git a/asmb/asmbtest.c b/asmb/asmbtest.c
index bea72ba..45c1395 100644
--- a/asmb/asmbtest.c
+++ b/asmb/asmbtest.c
@@ -39,7 +39,7 @@ static void hexdump(void *d, int len) {
 	}
 }
 
-#define NUM_TESTCASES 17
+#define NUM_TESTCASES 18
 int main()
 {
 	char *input[NUM_TESTCASES]={
@@ -60,6 +60,7 @@ int main()
 		"ASDFASDFasdfasdfaBC0AAAABBBBCCCCmuhKA\0asASDFasdf",
 		"ASas\0ASas",
 		"asdfABCDEFGHKL54",
+		"asdffvdfgerrggre\0",
 	};
 	int len[NUM_TESTCASES] = {
 		16,
@@ -78,7 +79,8 @@ int main()
 		32,
 		48,
 		9,
-		16
+		16,
+		17,
 	};
 	char *output_our, *output_ref;
 	char *input_our,  *input_ref;
-- 
2.25.1