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Use intermOut.cpp's IsNan and IsInfinity for parse-time constant folding

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There were two implementations of isInf() and isNan(), in Constant.cpp
and in intermOut.cpp. The former only works on little-endian systems,
the latter is a wrapper for library functions and works regardless of
endianness. Move the second version into Common.h and adopt it in both
places. Thereby avoid the duplication and fix for big-endian systems.

On s390x, this fixes the test case
Glsl/CompileToAstTest.FromFile/constFold_frag.

Fixes #2802
This commit is contained in:
Marius Hillenbrand 2021-11-09 16:31:22 +01:00
parent 8f56d73800
commit d1ee644e1d
3 changed files with 31 additions and 62 deletions
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33
glslang/MachineIndependent/Constant.cpp
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@ -46,35 +46,6 @@ namespace {
using namespace glslang;
typedef union {
double d;
int i[2];
} DoubleIntUnion;
// Some helper functions
bool isNan(double x)
{
DoubleIntUnion u;
// tough to find a platform independent library function, do it directly
u.d = x;
int bitPatternL = u.i[0];
int bitPatternH = u.i[1];
return (bitPatternH & 0x7ff80000) == 0x7ff80000 &&
((bitPatternH & 0xFFFFF) != 0 || bitPatternL != 0);
}
bool isInf(double x)
{
DoubleIntUnion u;
// tough to find a platform independent library function, do it directly
u.d = x;
int bitPatternL = u.i[0];
int bitPatternH = u.i[1];
return (bitPatternH & 0x7ff00000) == 0x7ff00000 &&
(bitPatternH & 0xFFFFF) == 0 && bitPatternL == 0;
}
const double pi = 3.1415926535897932384626433832795;
} // end anonymous namespace
@ -663,12 +634,12 @@ TIntermTyped* TIntermConstantUnion::fold(TOperator op, const TType& returnType)
case EOpIsNan:
{
newConstArray[i].setBConst(isNan(unionArray[i].getDConst()));
newConstArray[i].setBConst(IsNan(unionArray[i].getDConst()));
break;
}
case EOpIsInf:
{
newConstArray[i].setBConst(isInf(unionArray[i].getDConst()));
newConstArray[i].setBConst(IsInfinity(unionArray[i].getDConst()));
break;
}