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add test for GVN issue; cleanup in dataflow_const_prop

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Ralf Jung 2024-01-26 10:30:46 +01:00
parent 1025a12b64
commit 64cd13ff3b
5 changed files with 98 additions and 7 deletions
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7
compiler/rustc_mir_transform/src/dataflow_const_prop.rs
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@ -403,12 +403,7 @@ impl<'a, 'tcx> ConstAnalysis<'a, 'tcx> {
operand,
&mut |elem, op| match elem {
TrackElem::Field(idx) => self.ecx.project_field(op, idx.as_usize()).ok(),
TrackElem::Variant(idx) => {
if op.layout.for_variant(&self.ecx, idx).abi.is_uninhabited() {
return None;
}
self.ecx.project_downcast(op, idx).ok()
}
TrackElem::Variant(idx) => self.ecx.project_downcast(op, idx).ok(),
TrackElem::Discriminant => {
let variant = self.ecx.read_discriminant(op).ok()?;
let discr_value =