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VstdLib: light optimizations for CUniformRandomStream

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Use Min instead of an inline check, this generates better assembly code. Also made all the used defines a float to avoid having to cast each time since we aren't working with double precision floating points here.
This commit is contained in:
Kawe Mazidjatari 2024-07-30 11:45:07 +02:00
parent f4d8acc918
commit 0a49d03589
1 changed files with 5 additions and 13 deletions
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18
src/vstdlib/random.cpp
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@ -20,9 +20,9 @@
// fran1 -- return a random floating-point number on the interval [0,1)
//
#define AM (1.0/IM)
#define EPS 1.2e-7
#define RNMX (1.0-EPS)
#define AM (1.0f/IM)
#define EPS 1.2e-7f
#define RNMX (1.0f-EPS)
//-----------------------------------------------------------------------------
// globals
@ -118,22 +118,14 @@ int CUniformRandomStream::GenerateRandomNumber()
float CUniformRandomStream::RandomFloat(const float flLow, const float flHigh)
{
// float in [0,1)
float fl = float(AM) * GenerateRandomNumber();
if (fl > RNMX)
{
fl = float(RNMX);
}
const float fl = Min(AM * GenerateRandomNumber(), RNMX);
return (fl * (flHigh - flLow)) + flLow; // float in [low,high)
}
float CUniformRandomStream::RandomFloatExp(const float flMinVal, const float flMaxVal, const float flExponent)
{
// float in [0,1)
float fl = float(AM) * GenerateRandomNumber();
if (fl > RNMX)
{
fl = float(RNMX);
}
float fl = Min(AM * GenerateRandomNumber(), RNMX);
if (flExponent != 1.0f)
{
fl = powf(fl, flExponent);