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Fix UBSAN error with negating 0x8000'0000

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Signed-off-by: Shahbaz Youssefi <ShabbyX@gmail.com>
This commit is contained in:
Shahbaz Youssefi 2021-06-01 22:02:49 -04:00
parent 9431c53c84
commit 10a7137dc9
1 changed files with 6 additions and 1 deletions
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7
glslang/MachineIndependent/Constant.cpp
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@ -529,7 +529,12 @@ TIntermTyped* TIntermConstantUnion::fold(TOperator op, const TType& returnType)
case EbtDouble:
case EbtFloat16:
case EbtFloat: newConstArray[i].setDConst(-unionArray[i].getDConst()); break;
case EbtInt: newConstArray[i].setIConst(-unionArray[i].getIConst()); break;
// Note: avoid UBSAN error regarding negating 0x80000000
case EbtInt: newConstArray[i].setIConst(
unionArray[i].getIConst() == 0x80000000
? -0x7FFFFFFF - 1
: -unionArray[i].getIConst());
break;
case EbtUint: newConstArray[i].setUConst(static_cast<unsigned int>(-static_cast<int>(unionArray[i].getUConst()))); break;
#ifndef GLSLANG_WEB
case EbtInt8: newConstArray[i].setI8Const(-unionArray[i].getI8Const()); break;