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Add signed->unsigned promotion for binary operators 

The C-style rules for integer promotion are that when you have a signed int and an unsigned int, if you can't promote to a wider type, then the signed type is promoted to an unsigned type.
This commit is contained in:
Marisa Heit 2022-08-01 21:51:32 -05:00 committed by Christoph Oelckers
parent 15c5728f01
commit 7ce29fe855
1 changed files with 13 additions and 0 deletions
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13
src/common/scripting/backend/codegen.cpp
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@ -2685,6 +2685,19 @@ bool FxBinary::Promote(FCompileContext &ctx, bool forceint)
{
ValueType = TypeUInt32;
}
// If one side is an unsigned 32-bit int and the other side is a signed 32-bit int, the signed side is implicitly converted to unsigned.
else if (!ctx.FromDecorate && left->ValueType == TypeUInt32 && right->ValueType == TypeSInt32)
{
right = new FxIntCast(right, false, false, true);
right = right->Resolve(ctx);
ValueType = TypeUInt32;
}
else if (!ctx.FromDecorate && left->ValueType == TypeSInt32 && right->ValueType == TypeUInt32)
{
left = new FxIntCast(left, false, false, true);
left = left->Resolve(ctx);
ValueType = TypeUInt32;
}
else if (left->IsInteger() && right->IsInteger())
{
ValueType = TypeSInt32; // Addition and subtraction forces all integer-derived types to signed int.