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Rollup merge of #77582 - ecstatic-morse:disable-early-otherwise-branch, r=wesleywiser

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Move `EarlyOtherwiseBranch` to mir-opt-level 2

cc #75119

This didn't have an [effect in most cases](https://perf.rust-lang.org/compare.html?start=81e02708f1f4760244756548981277d5199baa9a&end=2e0edc0f28c5647141bedba02e7a222d3a5dc9c3&stat=instructions:u), and is not trivially sound. Let it bake at `mir-opt-level=2` for a while.

Also, this missed the cutoff for beta, so we'll have to backport this.
r? @wesleywiser
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Dylan DPC 2020-10-07 00:16:08 +02:00 • committed by GitHub
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compiler/rustc_mir/src/transform/early_otherwise_branch.rs
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@ -26,7 +26,7 @@ pub struct EarlyOtherwiseBranch;
impl<'tcx> MirPass<'tcx> for EarlyOtherwiseBranch {
fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
if tcx.sess.opts.debugging_opts.mir_opt_level < 1 {
if tcx.sess.opts.debugging_opts.mir_opt_level < 2 {
return;
}
trace!("running EarlyOtherwiseBranch on {:?}", body.source);