Commit: 490b73ff22ce554eaed6f0804b1fd1e9f36ceb43
Author: Sergej Reich
Date: Tue Nov 11 18:08:15 2014 +0100
Branches: master
https://developer.blender.org/rB490b73ff22ce554eaed6f0804b1fd1e9f36ceb43
cloth: Avoid calling powf with integer exponent
This is pretty slow and even shows up in profiling.
===================================================================
M source/blender/blenkernel/intern/implicit.c
===================================================================
diff --git a/source/blender/blenkernel/intern/implicit.c
b/source/blender/blenkernel/intern/implicit.c
index 9a8c32c..fe64af1 100644
--- a/source/blender/blenkernel/intern/implicit.c
+++ b/source/blender/blenkernel/intern/implicit.c
@@ -686,14 +686,18 @@ int implicit_free(ClothModifierData *clmd)
DO_INLINE float fb(float length, float L)
{
float x = length / L;
- return (-11.541f * powf(x, 4) + 34.193f * powf(x, 3) - 39.083f *
powf(x, 2) + 23.116f * x - 9.713f);
+ float xx = x * x;
+ float xxx = xx * x;
+ float xxxx = xxx * x;
+ return (-11.541f * xxxx + 34.193f * xxx - 39.083f * xx + 23.116f * x -
9.713f);
}
DO_INLINE float fbderiv(float length, float L)
{
float x = length/L;
-
- return (-46.164f * powf(x, 3) + 102.579f * powf(x, 2) - 78.166f * x +
23.116f);
+ float xx = x * x;
+ float xxx = xx * x;
+ return (-46.164f * xxx + 102.579f * xx - 78.166f * x + 23.116f);
}
DO_INLINE float fbstar(float length, float L, float kb, float cb)
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