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The `constFoldBinaryOp` helper function had limited support for different input and output types, but the static type of the underlying value (e.g. `APInt`) had to match between the inputs and the output. This worked fine for int comparisons of the form `(intN, intN) -> int1`, as the static type signature was `(APInt, APInt) -> APInt`. However, float comparisons map `(floatN, floatN) -> int1`, with a static type signature of `(APFloat, APFloat) -> APInt`. This use case wasn't supported by `constFoldBinaryOp`. `constFoldBinaryOp` now accepts an optional template argument overriding the return type in case it differs from the input type. If the new template argument isn't provided, the default behavior is unchanged (i.e. the return type will be assumed to match the input type). `constFoldUnaryOp` received similar changes in order to support folding non-cast ops of the form `(T1) -> T2` (e.g. a `sign` op mapping `(floatN) -> sint32`).
The LLVM Compiler Infrastructure
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