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Add parse-time constant folding for isinf() and isnan().

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git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@22621 e7fa87d3-cd2b-0410-9028-fcbf551c1848
This commit is contained in:
John Kessenich 2013-08-06 20:22:51 +00:00
parent af262433ab
commit 1b42f2a33d
3 changed files with 119 additions and 73 deletions
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48
glslang/MachineIndependent/Constant.cpp
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@ -35,10 +35,32 @@
//
#include "localintermediate.h"
#include "math.h"
#include <cmath>
#include <cfloat>
#include <cstdlib>
namespace glslang {
bool isNan(double x)
{
// tough to find a platform independent library function, do it directly
int bitPatternL = *(int*)&x;
int bitPatternH = *((int*)&x + 1);
return (bitPatternH & 0x7ff80000) == 0x7ff80000 &&
((bitPatternH & 0xFFFFF) != 0 || bitPatternL != 0);
}
bool isInf(double x)
{
// tough to find a platform independent library function, do it directly
int bitPatternL = *(int*)&x;
int bitPatternH = *((int*)&x + 1);
return (bitPatternH & 0x7ff00000) == 0x7ff00000 &&
(bitPatternH & 0xFFFFF) == 0 && bitPatternL == 0;
}
};
namespace {
// Some helper functions
@ -175,10 +197,7 @@ TIntermTyped* TIntermConstantUnion::fold(TOperator op, TIntermTyped* constantNod
for (int i = 0; i < objectSize; i++) {
switch (getType().getBasicType()) {
case EbtFloat:
if (rightUnionArray[i] == 0.0f) {
newConstArray[i].setDConst(FLT_MAX); // TODO: double support
} else
newConstArray[i].setDConst(unionArray[i].getDConst() / rightUnionArray[i].getDConst());
newConstArray[i].setDConst(unionArray[i].getDConst() / rightUnionArray[i].getDConst());
break;
case EbtInt:
@ -381,8 +400,8 @@ TIntermTyped* TIntermConstantUnion::fold(TOperator op, const TType& returnType,
case EOpAll:
case EOpLength:
newConstArray = new constUnion[1];
break;
break;
default:
newConstArray = new constUnion[objectSize];
}
@ -539,6 +558,17 @@ TIntermTyped* TIntermConstantUnion::fold(TOperator op, const TType& returnType,
break;
}
case EOpIsNan:
{
newConstArray[i].setBConst(glslang::isNan(unionArray[i].getDConst()));
break;
}
case EOpIsInf:
{
newConstArray[i].setBConst(glslang::isInf(unionArray[i].getDConst()));
break;
}
// TODO: Functionality: constant folding: the rest of the ops have to be fleshed out
case EOpSinh:
@ -548,13 +578,11 @@ TIntermTyped* TIntermConstantUnion::fold(TOperator op, const TType& returnType,
case EOpAcosh:
case EOpAtanh:
case EOpIsNan:
case EOpIsInf:
case EOpFloatBitsToInt:
case EOpFloatBitsToUint:
case EOpIntBitsToFloat:
case EOpUintBitsToFloat:
case EOpPackSnorm2x16:
case EOpUnpackSnorm2x16:
case EOpPackUnorm2x16: