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Fix warnings/errors for strict aliasing & function prototypes

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This fixes various issues related to gcc's strict-aliasing warning
by using unions. It also handles various cases hit with
gcc's missing-declarations warning.
This commit is contained in:
Mark Adams 2016-02-23 12:17:11 -05:00
parent 0967748fbc
commit 18b637f9dc
11 changed files with 39 additions and 17 deletions
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19
glslang/MachineIndependent/Constant.cpp
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@ -43,22 +43,31 @@ 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
int bitPatternL = *(int*)&x;
int bitPatternH = *((int*)&x + 1);
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
int bitPatternL = *(int*)&x;
int bitPatternH = *((int*)&x + 1);
u.d = x;
int bitPatternL = u.i[0];
int bitPatternH = u.i[1];
return (bitPatternH & 0x7ff00000) == 0x7ff00000 &&
(bitPatternH & 0xFFFFF) == 0 && bitPatternL == 0;
}
@ -173,7 +182,7 @@ TIntermTyped* TIntermConstantUnion::fold(TOperator op, const TIntermTyped* right
case EbtInt:
if (rightUnionArray[i] == 0)
newConstArray[i].setIConst(0x7FFFFFFF);
else if (rightUnionArray[i].getIConst() == -1 && leftUnionArray[i].getIConst() == 0x80000000)
else if (rightUnionArray[i].getIConst() == -1 && leftUnionArray[i].getIConst() == (int)0x80000000)
newConstArray[i].setIConst(0x80000000);
else
newConstArray[i].setIConst(leftUnionArray[i].getIConst() / rightUnionArray[i].getIConst());