================
@@ -2479,6 +2479,39 @@ OpFoldResult cir::UnaryOp::fold(FoldAdaptor adaptor) {
if (isBoolNot(previous))
return previous.getInput();
+ // Fold constant unary operations.
+ if (auto srcConst = getInput().getDefiningOp<cir::ConstantOp>()) {
----------------
andykaylor wrote:
I'll try a rewrite using the adaptor. That should be quick to implement, and it
seems to be a more standard way of doing things. I've implemented the next step
(folding during CG) in my sandbox, and I can verify that doing it that way does
create the constants in the order suggested above and leaves a dead constant
behind. The dead constant seems to be cleaned up if I wait until
`CIRCanonicalize`, but for some reason `createOrFold` leaves it behind.
https://github.com/llvm/llvm-project/pull/174882
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