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Change CHOOSE_XFORM_GRAIN to be 16384, so we can & with 16383 instead of using modulo. This results in a 9% speed increase on the CPU.

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mfeemster
2014-12-09 20:15:02 -08:00
parent d42cdfafe4
commit 7abecaf7be
2 changed files with 7 additions and 7 deletions
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6
Source/Ember/Iterator.h
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@ -6,8 +6,8 @@
/// Iterator and derived classes.
/// </summary>
//#define CHOOSE_XFORM_GRAIN 256
#define CHOOSE_XFORM_GRAIN 10000//The size of xform random selection buffer. Multiply by the (number of non-final xforms present + 1) if xaos is used.
#define CHOOSE_XFORM_GRAIN 16384//The size of xform random selection buffer. Multiply by the (number of non-final xforms present + 1) if xaos is used.
#define CHOOSE_XFORM_GRAIN_M1 16383//All 1s, so it's logically and-able.
namespace EmberNs
{
@ -259,7 +259,7 @@ protected:
/// <returns></returns>
size_t NextXformFromIndex(size_t index, size_t distribOffset = 0)
{
return size_t(m_XformDistributions[(index % CHOOSE_XFORM_GRAIN) + (CHOOSE_XFORM_GRAIN * distribOffset)]);
return size_t(m_XformDistributions[(index & CHOOSE_XFORM_GRAIN_M1) + (CHOOSE_XFORM_GRAIN * distribOffset)]);
}
vector<byte> m_XformDistributions;