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[clang][Interp] Fix discarded integral and floating casts #77295

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Merged
tbaederr merged 1 commit into from
Jan 10, 2024
Merged

[clang][Interp] Fix discarded integral and floating casts #77295

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7 changes: 7 additions & 0 deletions clang/lib/AST/Interp/ByteCodeExprGen.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -114,13 +114,17 @@ bool ByteCodeExprGen<Emitter>::VisitCastExpr(const CastExpr *CE) {
}

case CK_FloatingCast: {
if (DiscardResult)
return this->discard(SubExpr);
if (!this->visit(SubExpr))
return false;
const auto *TargetSemantics = &Ctx.getFloatSemantics(CE->getType());
return this->emitCastFP(TargetSemantics, getRoundingMode(CE), CE);
}

case CK_IntegralToFloating: {
if (DiscardResult)
return this->discard(SubExpr);
std::optional<PrimType> FromT = classify(SubExpr->getType());
if (!FromT)
return false;
Expand All @@ -135,6 +139,9 @@ bool ByteCodeExprGen<Emitter>::VisitCastExpr(const CastExpr *CE) {

case CK_FloatingToBoolean:
case CK_FloatingToIntegral: {
if (DiscardResult)
return this->discard(SubExpr);

std::optional<PrimType> ToT = classify(CE->getType());

if (!ToT)
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4 changes: 4 additions & 0 deletions clang/test/AST/Interp/literals.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1024,6 +1024,10 @@ namespace DiscardExprs {
__null;
__builtin_offsetof(A, a);
1,2;
(int)1.0;
(float)1;
(double)1.0f;
(signed)4u;

return 0;
}
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