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Auto merge of #105323 - cjgillot:simplify-const-prop, r=davidtwco

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Perform SimplifyLocals before ConstProp.

MIR before `ConstProp` may have a lot of dead writes, this makes `ConstProp` do unnecessary work.

r? `@ghost`
This commit is contained in:
bors 2023-01-07 16:13:18 +00:00
commit b1691f6413
81 changed files with 379 additions and 512 deletions
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3
compiler/rustc_mir_transform/src/lib.rs
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@ -557,6 +557,7 @@ fn run_optimization_passes<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
&multiple_return_terminators::MultipleReturnTerminators,
&instcombine::InstCombine,
&separate_const_switch::SeparateConstSwitch,
&simplify::SimplifyLocals::new("before-const-prop"),
//
// FIXME(#70073): This pass is responsible for both optimization as well as some lints.
&const_prop::ConstProp,
@ -575,7 +576,7 @@ fn run_optimization_passes<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
&o1(remove_noop_landing_pads::RemoveNoopLandingPads),
&o1(simplify::SimplifyCfg::new("final")),
&nrvo::RenameReturnPlace,
&simplify::SimplifyLocals,
&simplify::SimplifyLocals::new("final"),
&multiple_return_terminators::MultipleReturnTerminators,
&deduplicate_blocks::DeduplicateBlocks,
// Some cleanup necessary at least for LLVM and potentially other codegen backends.