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Sandwich MIR optimizations between DSE.

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This commit is contained in:
Camille GILLOT 2024-01-06 18:34:25 +00:00
parent 3a6bf351a3
commit 0aedd6e86f
70 changed files with 539 additions and 282 deletions
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12
compiler/rustc_mir_transform/src/dead_store_elimination.rs
View file

@ -127,9 +127,19 @@ pub fn eliminate<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
crate::simplify::simplify_locals(body, tcx)
}
pub struct DeadStoreElimination;
pub enum DeadStoreElimination {
Initial,
Final,
}
impl<'tcx> MirPass<'tcx> for DeadStoreElimination {
fn name(&self) -> &'static str {
match self {
DeadStoreElimination::Initial => "DeadStoreElimination-initial",
DeadStoreElimination::Final => "DeadStoreElimination-final",
}
}
fn is_enabled(&self, sess: &rustc_session::Session) -> bool {
sess.mir_opt_level() >= 2
}

9
compiler/rustc_mir_transform/src/lib.rs
View file

@ -595,24 +595,25 @@ fn run_optimization_passes<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
&multiple_return_terminators::MultipleReturnTerminators,
&instsimplify::InstSimplify,
&simplify::SimplifyLocals::BeforeConstProp,
&copy_prop::CopyProp,
&dead_store_elimination::DeadStoreElimination::Initial,
&gvn::GVN,
&simplify::SimplifyLocals::AfterGVN,
// Perform `SeparateConstSwitch` after SSA-based analyses, as cloning blocks may
// destroy the SSA property. It should still happen before const-propagation, so the
// latter pass will leverage the created opportunities.
&separate_const_switch::SeparateConstSwitch,
&gvn::GVN,
&simplify::SimplifyLocals::AfterGVN,
&dataflow_const_prop::DataflowConstProp,
&const_debuginfo::ConstDebugInfo,
&o1(simplify_branches::SimplifyConstCondition::AfterConstProp),
&jump_threading::JumpThreading,
&early_otherwise_branch::EarlyOtherwiseBranch,
&simplify_comparison_integral::SimplifyComparisonIntegral,
&dead_store_elimination::DeadStoreElimination,
&dest_prop::DestinationPropagation,
&o1(simplify_branches::SimplifyConstCondition::Final),
&o1(remove_noop_landing_pads::RemoveNoopLandingPads),
&o1(simplify::SimplifyCfg::Final),
&copy_prop::CopyProp,
&dead_store_elimination::DeadStoreElimination::Final,
&nrvo::RenameReturnPlace,
&simplify::SimplifyLocals::Final,
&multiple_return_terminators::MultipleReturnTerminators,