Auto merge of rust-lang#125910 - scottmcm:single-use-consts, r=saethlin

Add `SingleUseConsts` mir-opt pass

The goal here is to make a pass that can be run in debug builds to simplify the common case of constants that are used just once -- that doesn't need SSA handling and avoids any potential downside of multi-use constants.  In particular, to simplify the `if T::IS_ZST` pattern that's common in the standard library.

By also handling the case of constants that are *never* actually used this fully replaces the `ConstDebugInfo` pass, since it has all the information needed to do that naturally from the traversal it needs to do anyway.

This is roughly a wash on instructions on its own (a couple regressions, a few improvements rust-lang#125910 (comment)), with a bunch of size improvements.  So I'd like to land it as its own PR, then do follow-ups to take more advantage of it (in the inliner, cg_ssa, etc).

r? `@saethlin`

Author: bors

Diff for: compiler/rustc_mir_transform/src/const_debuginfo.rs

@@ -55,7 +55,6 @@ mod remove_place_mention;
 // This pass is public to allow external drivers to perform MIR cleanup
 mod add_subtyping_projections;
 pub mod cleanup_post_borrowck;
-mod const_debuginfo;
 mod copy_prop;
 mod coroutine;
 mod cost_checker;
@@ -106,6 +105,7 @@ mod check_alignment;
 pub mod simplify;
 mod simplify_branches;
 mod simplify_comparison_integral;
+mod single_use_consts;
 mod sroa;
 mod unreachable_enum_branching;
 mod unreachable_prop;
@@ -593,7 +593,7 @@ fn run_optimization_passes<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
             &gvn::GVN,
             &simplify::SimplifyLocals::AfterGVN,
             &dataflow_const_prop::DataflowConstProp,
-            &const_debuginfo::ConstDebugInfo,
+            &single_use_consts::SingleUseConsts,
             &o1(simplify_branches::SimplifyConstCondition::AfterConstProp),
             &jump_threading::JumpThreading,
             &early_otherwise_branch::EarlyOtherwiseBranch,

Diff for: compiler/rustc_mir_transform/src/lib.rs

@@ -0,0 +1,199 @@
+use rustc_index::{bit_set::BitSet, IndexVec};
+use rustc_middle::bug;
+use rustc_middle::mir::visit::{MutVisitor, PlaceContext, Visitor};
+use rustc_middle::mir::*;
+use rustc_middle::ty::TyCtxt;
+
+/// Various parts of MIR building introduce temporaries that are commonly not needed.
+///
+/// Notably, `if CONST` and `match CONST` end up being used-once temporaries, which
+/// obfuscates the structure for other passes and codegen, which would like to always
+/// be able to just see the constant directly.
+///
+/// At higher optimization levels fancier passes like GVN will take care of this
+/// in a more general fashion, but this handles the easy cases so can run in debug.
+///
+/// This only removes constants with a single-use because re-evaluating constants
+/// isn't always an improvement, especially for large ones.
+///
+/// It also removes *never*-used constants, since it had all the information
+/// needed to do that too, including updating the debug info.
+pub struct SingleUseConsts;
+
+impl<'tcx> MirPass<'tcx> for SingleUseConsts {
+    fn is_enabled(&self, sess: &rustc_session::Session) -> bool {
+        sess.mir_opt_level() > 0
+    }
+
+    fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
+        let mut finder = SingleUseConstsFinder {
+            ineligible_locals: BitSet::new_empty(body.local_decls.len()),
+            locations: IndexVec::from_elem(LocationPair::new(), &body.local_decls),
+            locals_in_debug_info: BitSet::new_empty(body.local_decls.len()),
+        };
+
+        finder.ineligible_locals.insert_range(..=Local::from_usize(body.arg_count));
+
+        finder.visit_body(body);
+
+        for (local, locations) in finder.locations.iter_enumerated() {
+            if finder.ineligible_locals.contains(local) {
+                continue;
+            }
+
+            let Some(init_loc) = locations.init_loc else {
+                continue;
+            };
+
+            // We're only changing an operand, not the terminator kinds or successors
+            let basic_blocks = body.basic_blocks.as_mut_preserves_cfg();
+            let init_statement =
+                basic_blocks[init_loc.block].statements[init_loc.statement_index].replace_nop();
+            let StatementKind::Assign(place_and_rvalue) = init_statement.kind else {
+                bug!("No longer an assign?");
+            };
+            let (place, rvalue) = *place_and_rvalue;
+            assert_eq!(place.as_local(), Some(local));
+            let Rvalue::Use(operand) = rvalue else { bug!("No longer a use?") };
+
+            let mut replacer = LocalReplacer { tcx, local, operand: Some(operand) };
+
+            if finder.locals_in_debug_info.contains(local) {
+                for var_debug_info in &mut body.var_debug_info {
+                    replacer.visit_var_debug_info(var_debug_info);
+                }
+            }
+
+            let Some(use_loc) = locations.use_loc else { continue };
+
+            let use_block = &mut basic_blocks[use_loc.block];
+            if let Some(use_statement) = use_block.statements.get_mut(use_loc.statement_index) {
+                replacer.visit_statement(use_statement, use_loc);
+            } else {
+                replacer.visit_terminator(use_block.terminator_mut(), use_loc);
+            }
+
+            if replacer.operand.is_some() {
+                bug!(
+                    "operand wasn't used replacing local {local:?} with locations {locations:?} in body {body:#?}"
+                );
+            }
+        }
+    }
+}
+
+#[derive(Copy, Clone, Debug)]
+struct LocationPair {
+    init_loc: Option<Location>,
+    use_loc: Option<Location>,
+}
+
+impl LocationPair {
+    fn new() -> Self {
+        Self { init_loc: None, use_loc: None }
+    }
+}
+
+struct SingleUseConstsFinder {
+    ineligible_locals: BitSet<Local>,
+    locations: IndexVec<Local, LocationPair>,
+    locals_in_debug_info: BitSet<Local>,
+}
+
+impl<'tcx> Visitor<'tcx> for SingleUseConstsFinder {
+    fn visit_assign(&mut self, place: &Place<'tcx>, rvalue: &Rvalue<'tcx>, location: Location) {
+        if let Some(local) = place.as_local()
+            && let Rvalue::Use(operand) = rvalue
+            && let Operand::Constant(_) = operand
+        {
+            let locations = &mut self.locations[local];
+            if locations.init_loc.is_some() {
+                self.ineligible_locals.insert(local);
+            } else {
+                locations.init_loc = Some(location);
+            }
+        } else {
+            self.super_assign(place, rvalue, location);
+        }
+    }
+
+    fn visit_operand(&mut self, operand: &Operand<'tcx>, location: Location) {
+        if let Some(place) = operand.place()
+            && let Some(local) = place.as_local()
+        {
+            let locations = &mut self.locations[local];
+            if locations.use_loc.is_some() {
+                self.ineligible_locals.insert(local);
+            } else {
+                locations.use_loc = Some(location);
+            }
+        } else {
+            self.super_operand(operand, location);
+        }
+    }
+
+    fn visit_statement(&mut self, statement: &Statement<'tcx>, location: Location) {
+        match &statement.kind {
+            // Storage markers are irrelevant to this.
+            StatementKind::StorageLive(_) | StatementKind::StorageDead(_) => {}
+            _ => self.super_statement(statement, location),
+        }
+    }
+
+    fn visit_var_debug_info(&mut self, var_debug_info: &VarDebugInfo<'tcx>) {
+        if let VarDebugInfoContents::Place(place) = &var_debug_info.value
+            && let Some(local) = place.as_local()
+        {
+            self.locals_in_debug_info.insert(local);
+        } else {
+            self.super_var_debug_info(var_debug_info);
+        }
+    }
+
+    fn visit_local(&mut self, local: Local, _context: PlaceContext, _location: Location) {
+        // If there's any path that gets here, rather than being understood elsewhere,
+        // then we'd better not do anything with this local.
+        self.ineligible_locals.insert(local);
+    }
+}
+
+struct LocalReplacer<'tcx> {
+    tcx: TyCtxt<'tcx>,
+    local: Local,
+    operand: Option<Operand<'tcx>>,
+}
+
+impl<'tcx> MutVisitor<'tcx> for LocalReplacer<'tcx> {
+    fn tcx(&self) -> TyCtxt<'tcx> {
+        self.tcx
+    }
+
+    fn visit_operand(&mut self, operand: &mut Operand<'tcx>, _location: Location) {
+        if let Operand::Copy(place) | Operand::Move(place) = operand
+            && let Some(local) = place.as_local()
+            && local == self.local
+        {
+            *operand = self.operand.take().unwrap_or_else(|| {
+                bug!("there was a second use of the operand");
+            });
+        }
+    }
+
+    fn visit_var_debug_info(&mut self, var_debug_info: &mut VarDebugInfo<'tcx>) {
+        if let VarDebugInfoContents::Place(place) = &var_debug_info.value
+            && let Some(local) = place.as_local()
+            && local == self.local
+        {
+            let const_op = self
+                .operand
+                .as_ref()
+                .unwrap_or_else(|| {
+                    bug!("the operand was already stolen");
+                })
+                .constant()
+                .unwrap()
+                .clone();
+            var_debug_info.value = VarDebugInfoContents::Const(const_op);
+        }
+    }
+}

Diff for: compiler/rustc_mir_transform/src/single_use_consts.rs

@@ -5,9 +5,9 @@ fn constant_eq(s: &str, b: bool) -> u32 {
     // Check that we only test "a" once
 
     // CHECK-LABEL: fn constant_eq(
-    // CHECK: bb0: {
-    // CHECK: [[a:_.*]] = const "a";
-    // CHECK-NOT: {{_.*}} = const "a";
+    // CHECK-NOT: const "a"
+    // CHECK: {{_[0-9]+}} = const "a" as &[u8] (Transmute);
+    // CHECK-NOT: const "a"
     match (s, b) {
         ("a", _) if true => 1,
         ("b", true) => 2,