Give inlining bonuses to things that optimize out

Author: scottmcm

compiler/rustc_mir_transform/src/cost_checker.rs

@@ -6,6 +6,8 @@ const INSTR_COST: usize = 5;
 const CALL_PENALTY: usize = 25;
 const LANDINGPAD_PENALTY: usize = 50;
 const RESUME_PENALTY: usize = 45;
+const LARGE_SWITCH_PENALTY: usize = 20;
+const CONST_SWITCH_BONUS: usize = 30;
 
 /// Verify that the callee body is compatible with the caller.
 #[derive(Clone)]
@@ -42,13 +44,30 @@ impl<'b, 'tcx> CostChecker<'b, 'tcx> {
 }
 
 impl<'tcx> Visitor<'tcx> for CostChecker<'_, 'tcx> {
-    fn visit_statement(&mut self, statement: &Statement<'tcx>, _: Location) {
-        // Don't count StorageLive/StorageDead in the inlining cost.
+    fn visit_statement(&mut self, statement: &Statement<'tcx>, location: Location) {
+        // Most costs are in rvalues and terminators, not in statements.
         match statement.kind {
-            StatementKind::StorageLive(_)
-            | StatementKind::StorageDead(_)
-            | StatementKind::Deinit(_)
-            | StatementKind::Nop => {}
+            StatementKind::Intrinsic(ref ndi) => {
+                self.penalty += match **ndi {
+                    NonDivergingIntrinsic::Assume(..) => INSTR_COST,
+                    NonDivergingIntrinsic::CopyNonOverlapping(..) => CALL_PENALTY,
+                };
+            }
+            _ => self.super_statement(statement, location),
+        }
+    }
+
+    fn visit_rvalue(&mut self, rvalue: &Rvalue<'tcx>, _location: Location) {
+        match rvalue {
+            Rvalue::NullaryOp(NullOp::UbChecks, ..) if !self.tcx.sess.ub_checks() => {
+                // If this is in optimized MIR it's because it's used later,
+                // so if we don't need UB checks this session, give a bonus
+                // here to offset the cost of the call later.
+                self.bonus += CALL_PENALTY;
+            }
+            // These are essentially constants that didn't end up in an Operand,
+            // so treat them as also being free.
+            Rvalue::NullaryOp(..) => {}
             _ => self.penalty += INSTR_COST,
         }
     }
@@ -82,8 +101,25 @@ impl<'tcx> Visitor<'tcx> for CostChecker<'_, 'tcx> {
                     self.penalty += LANDINGPAD_PENALTY;
                 }
             }
-            TerminatorKind::Assert { unwind, .. } => {
-                self.penalty += CALL_PENALTY;
+            TerminatorKind::SwitchInt { ref discr, ref targets } => {
+                if discr.constant().is_some() {
+                    // Not only will this become a `Goto`, but likely other
+                    // things will be removable as unreachable.
+                    self.bonus += CONST_SWITCH_BONUS;
+                } else if targets.all_targets().len() > 3 {
+                    // More than false/true/unreachable gets extra cost.
+                    self.penalty += LARGE_SWITCH_PENALTY;
+                } else {
+                    self.penalty += INSTR_COST;
+                }
+            }
+            TerminatorKind::Assert { unwind, ref msg, .. } => {
+                self.penalty +=
+                    if msg.is_optional_overflow_check() && !self.tcx.sess.overflow_checks() {
+                        INSTR_COST
+                    } else {
+                        CALL_PENALTY
+                    };
                 if let UnwindAction::Cleanup(_) = unwind {
                     self.penalty += LANDINGPAD_PENALTY;
                 }