bjoernager/rust
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Disable MatchBranchSimplification

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This optimization can result in unsoundness, because it introduces
additional uses of a place holding the discriminant value without
ensuring that it is valid to do so.
This commit is contained in:
Tomasz Miąsko 2020-10-20 00:00:00 +00:00
parent 9832374f6e
commit c2af254e3b
7 changed files with 180 additions and 151 deletions
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7
compiler/rustc_mir/src/transform/match_branches.rs
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@ -38,6 +38,13 @@ pub struct MatchBranchSimplification;
impl<'tcx> MirPass<'tcx> for MatchBranchSimplification {
fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
// FIXME: This optimization can result in unsoundness, because it introduces
// additional uses of a place holding the discriminant value without ensuring that
// it is valid to do so.
if !tcx.sess.opts.debugging_opts.unsound_mir_opts {
return;
}
let param_env = tcx.param_env(body.source.def_id());
let bbs = body.basic_blocks_mut();
'outer: for bb_idx in bbs.indices() {