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[mir-opt] Introduce a new flag to enable experimental/unsound mir opts

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This commit is contained in:
Wesley Wiser
2020-09-18 20:14:27 -04:00
parent 7f7a1cbfd3
commit b9d0ea95c8
20 changed files with 397 additions and 359 deletions
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4
compiler/rustc_mir/src/transform/copy_prop.rs
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@@ -31,9 +31,11 @@ pub struct CopyPropagation;
impl<'tcx> MirPass<'tcx> for CopyPropagation {
fn run_pass(&self, tcx: TyCtxt<'tcx>, _source: MirSource<'tcx>, body: &mut Body<'tcx>) {
let opts = &tcx.sess.opts.debugging_opts;
// We only run when the MIR optimization level is > 1.
// This avoids a slow pass, and messing up debug info.
if tcx.sess.opts.debugging_opts.mir_opt_level <= 1 {
// FIXME(76740): This optimization is buggy and can cause unsoundness.
if opts.mir_opt_level <= 1 || !opts.unsound_mir_opts {
return;
}