Avoid calling powf with integer exponent in more places

Move powX functions from particle code into math library and use them.

2 files changed, 23 insertions, 0 deletions

diff --git a/source/blender/blenlib/BLI_math_base.h b/source/blender/blenlib/BLI_math_base.h
index 07de074e717..5711d09b530 100644
--- a/source/blender/blenlib/BLI_math_base.h
+++ b/source/blender/blenlib/BLI_math_base.h
@@ -157,6 +157,11 @@ static const int NAN_INT = 0x7FC00000;
 
 /******************************* Float ******************************/
 
+MINLINE float pow2f(float x);
+MINLINE float pow3f(float x);
+MINLINE float pow4f(float x);
+MINLINE float pow7f(float x);
+
 MINLINE float sqrt3f(float f);
 MINLINE double sqrt3d(double d);
 
diff --git a/source/blender/blenlib/intern/math_base_inline.c b/source/blender/blenlib/intern/math_base_inline.c
index e6217329145..39116d6f30f 100644
--- a/source/blender/blenlib/intern/math_base_inline.c
+++ b/source/blender/blenlib/intern/math_base_inline.c
@@ -44,6 +44,24 @@
 #  define UNLIKELY(x)     (x)
 #endif
 
+/* powf is really slow for raising to integer powers. */
+MINLINE float pow2f(float x)
+{
+	return x * x;
+}
+MINLINE float pow3f(float x)
+{
+	return pow2f(x) * x;
+}
+MINLINE float pow4f(float x)
+{
+	return pow2f(pow2f(x));
+}
+MINLINE float pow7f(float x)
+{
+	return pow2f(pow3f(x)) * x;
+}
+
 MINLINE float sqrt3f(float f)
 {
 	if      (UNLIKELY(f == 0.0f)) return 0.0f;