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[FIRRTL][Folds] Fix mux fold if result type doesn't match operands. #7585

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Sep 4, 2024
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[FIRRTL][Folds] Fix mux fold if result type doesn't match operands. #7585

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2 changes: 1 addition & 1 deletion lib/Dialect/FIRRTL/FIRRTLFolds.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1269,7 +1269,7 @@ static OpFoldResult foldMux(OpTy op, typename OpTy::FoldAdaptor adaptor) {
APInt(0, 0, op.getType().isSignedInteger()));

// mux(cond, x, x) -> x
if (op.getHigh() == op.getLow())
if (op.getHigh() == op.getLow() && op.getHigh().getType() == op.getType())
return op.getHigh();

// The following folds require that the result has a known width. Otherwise
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5 changes: 5 additions & 0 deletions test/Dialect/FIRRTL/canonicalization.mlir
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Expand Up @@ -3635,4 +3635,9 @@ firrtl.module @multibit_mux_drop_front(in %vec_0: !firrtl.uint<8>, in %vec_1: !f
firrtl.matchingconnect %c, %1 : !firrtl.uint<8>
}

firrtl.module private @Issue7562(in %sel : !firrtl.uint<1>, in %a : !firrtl.const.uint<1>, out %out : !firrtl.uint) {
%res = firrtl.mux(%sel, %a, %a) : (!firrtl.uint<1>, !firrtl.const.uint<1>, !firrtl.const.uint<1>) -> !firrtl.uint<1>
firrtl.connect %out, %res : !firrtl.uint, !firrtl.uint<1>
}

}
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