bjoernager/rust
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Lower discriminant_value intrinsic

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This allows const propagation to evaluate comparisons involving
field-less enums using derived implementations of `PartialEq` (after
inlining `eq`).
This commit is contained in:
Tomasz Miąsko 2020-12-11 00:00:00 +00:00
parent d32c320d7e
commit 686237c49a
5 changed files with 191 additions and 6 deletions
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1
compiler/rustc_codegen_ssa/src/mir/rvalue.rs
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@ -489,6 +489,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
mir::Rvalue::Discriminant(ref place) => {
let discr_ty = rvalue.ty(self.mir, bx.tcx());
let discr_ty = self.monomorphize(discr_ty);
let discr = self
.codegen_place(&mut bx, place.as_ref())
.codegen_get_discr(&mut bx, discr_ty);