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

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This commit is contained in:
Greg Fischer 2021-11-10 14:13:37 -07:00 committed by GitHub
parent 9c5309a22a
commit 22a5e36446
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 62 additions and 31 deletions
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29
glslang/Include/Common.h
View File

@ -39,7 +39,6 @@
#include <algorithm>
#include <cassert>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <list>
@ -303,34 +302,6 @@ template <class T> int IntLog2(T n)
return result;
}
inline bool IsInfinity(double x) {
#ifdef _MSC_VER
switch (_fpclass(x)) {
case _FPCLASS_NINF:
case _FPCLASS_PINF:
return true;
default:
return false;
}
#else
return std::isinf(x);
#endif
}
inline bool IsNan(double x) {
#ifdef _MSC_VER
switch (_fpclass(x)) {
case _FPCLASS_SNAN:
case _FPCLASS_QNAN:
return true;
default:
return false;
}
#else
return std::isnan(x);
#endif
}
} // end namespace glslang
#endif // _COMMON_INCLUDED_

33
glslang/MachineIndependent/Constant.cpp
View File

@ -46,6 +46,35 @@ 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
@ -634,12 +663,12 @@ 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(IsInfinity(unionArray[i].getDConst()));
newConstArray[i].setBConst(isInf(unionArray[i].getDConst()));
break;
}

31
glslang/MachineIndependent/intermOut.cpp
View File

@ -48,6 +48,37 @@
#endif
#include <cstdint>
namespace {
bool IsInfinity(double x) {
#ifdef _MSC_VER
switch (_fpclass(x)) {
case _FPCLASS_NINF:
case _FPCLASS_PINF:
return true;
default:
return false;
}
#else
return std::isinf(x);
#endif
}
bool IsNan(double x) {
#ifdef _MSC_VER
switch (_fpclass(x)) {
case _FPCLASS_SNAN:
case _FPCLASS_QNAN:
return true;
default:
return false;
}
#else
return std::isnan(x);
#endif
}
}
namespace glslang {