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Enable const propagation into operands at mir_opt_level=2 #77107

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Sep 27, 2020
Merged

Enable const propagation into operands at mir_opt_level=2 #77107

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10 changes: 5 additions & 5 deletions compiler/rustc_mir/src/transform/const_prop.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1046,9 +1046,9 @@ impl<'mir, 'tcx> MutVisitor<'tcx> for ConstPropagator<'mir, 'tcx> {
fn visit_operand(&mut self, operand: &mut Operand<'tcx>, location: Location) {
self.super_operand(operand, location);

// Only const prop copies and moves on `mir_opt_level=3` as doing so
// currently increases compile time.
if self.tcx.sess.opts.debugging_opts.mir_opt_level >= 3 {
// Only const prop copies and moves on `mir_opt_level=2` as doing so
// currently slightly increases compile time in some cases.
if self.tcx.sess.opts.debugging_opts.mir_opt_level >= 2 {
self.propagate_operand(operand)
}
}
Expand Down Expand Up @@ -1246,8 +1246,8 @@ impl<'mir, 'tcx> MutVisitor<'tcx> for ConstPropagator<'mir, 'tcx> {
| TerminatorKind::InlineAsm { .. } => {}
// Every argument in our function calls have already been propagated in `visit_operand`.
//
// NOTE: because LLVM codegen gives performance regressions with it, so this is gated
// on `mir_opt_level=3`.
// NOTE: because LLVM codegen gives slight performance regressions with it, so this is
// gated on `mir_opt_level=2`.
TerminatorKind::Call { .. } => {}
}

Expand Down