From f8e059deee28500b88c8c172eaa8c4d7ca657748 Mon Sep 17 00:00:00 2001
From: Dave Parks <davep@lindenlab.com>
Date: Fri, 8 Mar 2013 17:11:30 -0600
Subject: MAINT-2371 Lat round of optimizations.

Reviewed by Graham
---
 indra/llmath/llvector4a.inl | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

(limited to 'indra/llmath/llvector4a.inl')

diff --git a/indra/llmath/llvector4a.inl b/indra/llmath/llvector4a.inl
index 7c52ffef21..35a67204ec 100644
--- a/indra/llmath/llvector4a.inl
+++ b/indra/llmath/llvector4a.inl
@@ -460,16 +460,13 @@ inline void LLVector4a::setMax(const LLVector4a& lhs, const LLVector4a& rhs)
 	mQ = _mm_max_ps(lhs.mQ, rhs.mQ);
 }
 
-// Set this to  (c * lhs) + rhs * ( 1 - c)
+// Set this to  lhs + (rhs-lhs)*c
 inline void LLVector4a::setLerp(const LLVector4a& lhs, const LLVector4a& rhs, F32 c)
 {
-	LLVector4a a = lhs;
-	a.mul(c);
-	
-	LLVector4a b = rhs;
-	b.mul(1.f-c);
-	
-	setAdd(a, b);
+	LLVector4a t;
+	t.setSub(rhs,lhs);
+	t.mul(c);
+	setAdd(lhs, t);
 }
 
 inline LLBool32 LLVector4a::isFinite3() const
-- 
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