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GLSL: Fold constant SHRT_MIN/INT_MIN/LLONG_MIN % -1 to 0.

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This commit is contained in:
Aaron Muir Hamilton
2017-10-25 00:11:53 +00:00
parent b5b0846244
commit f83e2f0690
4 changed files with 88 additions and 1 deletions
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25
glslang/MachineIndependent/Constant.cpp
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@@ -38,6 +38,7 @@
#include <cmath>
#include <cfloat>
#include <cstdlib>
#include <climits>
namespace {
@@ -264,7 +265,29 @@ TIntermTyped* TIntermConstantUnion::fold(TOperator op, const TIntermTyped* right
if (rightUnionArray[i] == 0)
newConstArray[i] = leftUnionArray[i];
else
newConstArray[i] = leftUnionArray[i] % rightUnionArray[i];
switch (getType().getBasicType()) {
case EbtInt:
if (rightUnionArray[i].getIConst() == -1 && leftUnionArray[i].getIConst() == INT_MIN) {
newConstArray[i].setIConst(0);
break;
} else goto modulo_default;
case EbtInt64:
if (rightUnionArray[i].getI64Const() == -1 && leftUnionArray[i].getI64Const() == LLONG_MIN) {
newConstArray[i].setI64Const(0);
break;
} else goto modulo_default;
#ifdef AMD_EXTENSIONS
case EbtInt16:
if (rightUnionArray[i].getIConst() == -1 && leftUnionArray[i].getIConst() == SHRT_MIN) {
newConstArray[i].setIConst(0);
break;
} else goto modulo_default;
#endif
default:
modulo_default:
newConstArray[i] = leftUnionArray[i] % rightUnionArray[i];
}
}
break;