From: Niels Möller <nisse@lysator.liu.se>
Date: Fri, 12 Apr 2013 11:19:41 +0000 (+0200)
Subject: ARM umac_nh: Use vmlal, 16% speedup.
X-Git-Tag: nettle_2.7_release_20130424~54
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cdde35bb2530c4a29cb72dea9d5207a9c954c80f;p=thirdparty%2Fnettle.git

ARM umac_nh: Use vmlal, 16% speedup.
---

diff --git a/ChangeLog b/ChangeLog
index 7a163fe7..a4dd7b2b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,7 @@
 2013-04-12  Niels Möller  <nisse@lysator.liu.se>
 
-	* armv7/umac-nh.asm: New file. 2.1 time speedup.
+	* armv7/umac-nh.asm: New file. 2.4 time speedup.
+
 	* armv7/machine.m4 (D0REG, D1REG): New macros.
 
 	* configure.ac (asm_replace_list): Added umac-nh.asm and
diff --git a/armv7/umac-nh.asm b/armv7/umac-nh.asm
index 7c0a0290..87cb86d0 100644
--- a/armv7/umac-nh.asm
+++ b/armv7/umac-nh.asm
@@ -30,7 +30,7 @@ define(<QB>, <q1>)
 define(<DM>, <d16>)
 define(<QLEFT>, <q9>)
 define(<QRIGHT>, <q10>)
-define(<QACC>, <q11>)
+define(<QY>, <q11>)
 define(<QT0>, <q12>)
 define(<QT1>, <q13>)
 define(<QK0>, <q14>)
@@ -59,7 +59,7 @@ PROLOGUE(_nettle_umac_nh)
 	vmov.i32 D0REG(QLEFT)[0], SHIFT
 	vmov.32	 D1REG(QLEFT), D0REG(QLEFT)
 
-	vmov.i64 QACC, #0
+	vmov.i64 QY, #0
 
 	vshl.u64 DM, DM, D0REG(QRIGHT)
 .Loop:
@@ -78,14 +78,12 @@ PROLOGUE(_nettle_umac_nh)
 	vld1.i32 {QK0, QK1}, [KEY]!
 	vadd.i32 QA, QA, QK0
 	vadd.i32 QB, QB, QK1
-	vmull.u32 QT0, D0REG(QA), D0REG(QB)
-	vmull.u32 QT1, D1REG(QA), D1REG(QB)
 	subs	LENGTH, LENGTH, #32
-	vadd.i64 QACC, QACC, QT0
-	vadd.i64 QACC, QACC, QT1
+	vmlal.u32 QY, D0REG(QA), D0REG(QB)
+	vmlal.u32 QY, D1REG(QA), D1REG(QB)
 	bhi	.Loop
 
-	vadd.i64 D0REG(QACC), D0REG(QACC), D1REG(QACC)
-	vmov	r0, r1, D0REG(QACC)
+	vadd.i64 D0REG(QY), D0REG(QY), D1REG(QY)
+	vmov	r0, r1, D0REG(QY)
 	bx	lr
 EPILOGUE(_nettle_umac_nh)