Disable MandatoryCopyPropagation.

lib/SILOptimizer/PassManager/PassPipeline.cpp

@@ -912,10 +912,7 @@ SILPassPipelinePlan::getOnonePassPipeline(const SILOptions &Options) {
   P.startPipeline("non-Diagnostic Enabling Mandatory Optimizations");
   P.addForEachLoopUnroll();
   P.addMandatoryCombine();
-  if (P.getOptions().CopyPropagation == CopyPropagationOption::On) {
-    // MandatoryCopyPropagation should only be run at -Onone, not -O.
-    P.addMandatoryCopyPropagation();
-  }
+
   // TODO: MandatoryARCOpts should be subsumed by CopyPropagation. There should
   // be no need to run another analysis of copies at -Onone.
   P.addMandatoryARCOpts();

lib/SILOptimizer/Transforms/CopyPropagation.cpp

@@ -570,6 +570,8 @@ void CopyPropagation::run() {
   }
 }
 
+// MandatoryCopyPropagation is not currently enabled in the -Onone pipeline
+// because it may negatively affect the debugging experience.
 SILTransform *swift::createMandatoryCopyPropagation() {
   return new CopyPropagation(/*pruneDebug*/ true, /*canonicalizeAll*/ true,
                              /*canonicalizeBorrows*/ false,
@@ -581,4 +583,3 @@ SILTransform *swift::createCopyPropagation() {
                              /*canonicalizeBorrows*/ EnableRewriteBorrows,
                              /*poisonRefs*/ false);
 }
-

test/DebugInfo/if-branchlocations.swift

@@ -1,5 +1,4 @@
-// RUN: %target-swift-frontend %s -emit-sil -enable-copy-propagation=false -emit-verbose-sil -g -o - | %FileCheck %s --check-prefixes=CHECK,CHECK-NCP
-// RUN: %target-swift-frontend %s -emit-sil -enable-copy-propagation -enable-lexical-borrow-scopes=false -emit-verbose-sil -g -o - | %FileCheck %s --check-prefixes=CHECK,CHECK-CP
+// RUN: %target-swift-frontend %s -emit-sil -emit-verbose-sil -g -o - | %FileCheck %s --check-prefixes=CHECK
 
 class NSURL {}
 
@@ -27,8 +26,6 @@ class AppDelegate {
         // Verify that the branch's location is >= the cleanup's location.
         // (The implicit false block of the conditional
         //  below inherits the location from the condition.)
-        // CHECK-CP: strong_release{{.*}}$NSPathControlItem{{.*}}line:[[@LINE+3]]
-        // CHECK-CP: debug_value [poison] {{.*}}$NSPathControlItem, let, name "item"{{.*}}line:[[@LINE-7]]:14:in_prologue
         // CHECK: br{{.*}}line:[[@LINE+1]]
         if let url = item.URL
         {

test/DebugInfo/linetable-do.swift

@@ -1,6 +1,5 @@
 // RUN: %target-swift-frontend -Xllvm -sil-full-demangle %s -emit-ir -g -o - | %FileCheck %s
-// RUN: %target-swift-frontend -Xllvm -sil-full-demangle -enable-copy-propagation=false %s -emit-sil -emit-verbose-sil -g -o - | %FileCheck --check-prefixes=CHECK-SIL,CHECK-NCP %s
-// RUN: %target-swift-frontend -Xllvm -sil-full-demangle -enable-copy-propagation -enable-lexical-borrow-scopes=false %s -emit-sil -emit-verbose-sil -g -o - | %FileCheck --check-prefixes=CHECK-SIL,CHECK-CP %s
+// RUN: %target-swift-frontend -Xllvm -sil-full-demangle %s -emit-sil -emit-verbose-sil -g -o - | %FileCheck --check-prefixes=CHECK-SIL %s
 import StdlibUnittest
 
 class Obj {}
@@ -18,10 +17,9 @@ func testDoStmt() throws -> Void {
     let obj = Obj()
     _blackHole(obj)
     // The poison debug_value takes the location of the original decl.
-    // CHECK-CP:  debug_value [poison] %{{.*}} : $Obj{{.*}} line:[[@LINE-3]]:9:in_prologue
     try foo(100)
     // CHECK-SIL: bb{{.*}}(%{{[0-9]+}} : $()):
-    // CHECK-NCP-NEXT: strong_release {{.*}}: $Obj{{.*}} line:[[@LINE+1]]:3:cleanup
+    // CHECK-SIL-NEXT: strong_release {{.*}}: $Obj{{.*}} line:[[@LINE+1]]:3:cleanup
   }
   // CHECK-SIL-NEXT:     = tuple ()
   // CHECK-SIL-NEXT:   return                        {{.*}} line:[[@LINE+1]]

test/Distributed/SIL/distributed_actor_default_init_sil_5.swift

@@ -64,6 +64,8 @@ distributed actor MyDistActor {
 
 // CHECK: [[CONTINUE]]:
 // CHECK:        hop_to_executor [[SELF]] : $MyDistActor
+// One of the following retain_value operations could be optimized away.
+// CHECK-NEXT:   retain_value [[SYSTEM]] : $FakeActorSystem
 // CHECK-NEXT:   retain_value [[SYSTEM]] : $FakeActorSystem
 // CHECK-NEXT:   // function_ref FakeActorSystem.actorReady<A>(_:)
 // CHECK-NEXT:   [[READY_FN:%[0-9]+]] = function_ref @$s27FakeDistributedActorSystems0aC6SystemV10actorReadyyyx01_B00bC0RzAA0C7AddressV2IDRtzlF : $@convention(method) <τ_0_0 where τ_0_0 : DistributedActor, τ_0_0.ID == ActorAddress> (@guaranteed τ_0_0, @guaranteed FakeActorSystem) -> ()

test/IRGen/debug_poison.swift

@@ -1,4 +1,11 @@
 // RUN: %target-swift-frontend -primary-file %s -emit-ir -Onone -enable-copy-propagation -enable-lexical-borrow-scopes=false | %FileCheck %s -DINT=i%target-ptrsize
+//
+// This test is currently disabled because mandatory copy propagation
+// is not part of the pipeline. It may be re-added to the pipeline,
+// but it isn't clear if we'll still need to emit poison references by
+// that time.
+//
+// REQUIRES: mandatory_copy_propagation
 
 // Test debug_value [poison] emission
 

test/IRGen/unmanaged_objc_throw_func.swift

@@ -36,16 +36,12 @@ import Foundation
 
 // CHECK: [[L2]]:                                     ; preds = %entry
 // CHECK-NEXT: %[[T4:.+]] = phi %TSo10CFArrayRefa* [ %[[T0]], %entry ]
-// CHECK-NEXT: %[[T4a:.+]] = bitcast %T25unmanaged_objc_throw_func9SR_9035_CC* %{{.+}} to i8*
-// CHECK-NEXT: call void @llvm.objc.release(i8* %[[T4a]])
 // CHECK-NEXT: %[[T5:.+]] = ptrtoint %TSo10CFArrayRefa* %[[T4]] to i{{32|64}}
 // CHECK-NEXT: br label %[[L3:.+]]
 
 // CHECK: [[L1]]:                                     ; preds = %entry
 // CHECK-NEXT: %[[T6:.+]] = phi %swift.error* [ %[[T2]], %entry ]
 // CHECK-NEXT: store %swift.error* null, %swift.error** %swifterror, align {{[0-9]+}}
-// CHECK-NEXT: %[[T6a:.+]] = bitcast %T25unmanaged_objc_throw_func9SR_9035_CC* %{{.+}} to i8*
-// CHECK-NEXT: call void @llvm.objc.release(i8* %[[T6a]])
 // CHECK-NEXT: %[[T7:.+]] = icmp eq i{{32|64}} %{{.+}}, 0
 // CHECK-NEXT: br i1 %[[T7]], label %[[L4:.+]], label %[[L5:.+]]
 
@@ -70,5 +66,7 @@ import Foundation
 
 // CHECK: [[L3]]:                                     ; preds = %[[L2]], %[[L7]]
 // CHECK-NEXT: %[[T12:.+]] = phi i{{32|64}} [ 0, %[[L7]] ], [ %[[T5]], %[[L2]] ]
+// CHECK-NEXT: %[[T13:.+]] = bitcast %T25unmanaged_objc_throw_func9SR_9035_CC* %{{.+}} to i8*
+// CHECK-NEXT: call void @llvm.objc.release(i8* %[[T13]])
 // CHECK-NEXT: %[[T14:.+]] = inttoptr i{{32|64}} %[[T12]] to %struct.__CFArray*
 // CHECK-NEXT: ret %struct.__CFArray* %[[T14]]

test/Interpreter/builtin_bridge_object.swift

@@ -65,7 +65,6 @@ if true {
   // CHECK-NEXT: true
   print(x === x2)
   // CHECK-OPT-NEXT: deallocated
-  // CHECK-DBG-NEXT: deallocated
 
   print(nonPointerBits(bo) == 0)
   // CHECK-NEXT: true
@@ -79,6 +78,7 @@ if true {
   _fixLifetime(bo3)
   _fixLifetime(bo4)
 }
+// CHECK-DBG-NEXT: deallocated
 // CHECK-NEXT: deallocated
 
 // Try with all spare bits set.
@@ -94,7 +94,6 @@ if true {
   // CHECK-NEXT: true
   print(x === x2)
   // CHECK-OPT-NEXT: deallocated
-  // CHECK-DBG-NEXT: deallocated
 
   print(nonPointerBits(bo) == NATIVE_SPARE_BITS)
   // CHECK-NEXT: true
@@ -108,6 +107,7 @@ if true {
   _fixLifetime(bo3)
   _fixLifetime(bo4)
 }
+// CHECK-DBG-NEXT: deallocated
 // CHECK-NEXT: deallocated
 
 

test/SILGen/moveonly_builtin.swift

@@ -31,10 +31,10 @@ class Klass {}
 // CHECK-SIL-NEXT: debug_value
 // CHECK-SIL-NEXT: strong_retain
 // CHECK-SIL-NEXT: move_value
-// CHECK-SIL-NEXT: strong_release
 // CHECK-SIL-NEXT: debug_value [moved] undef
 // CHECK-SIL-NEXT: tuple
 // CHECK-SIL-NEXT: tuple
+// CHECK-SIL-NEXT: strong_release
 // CHECK-SIL-NEXT: return
 // CHECK-SIL: } // end sil function '$s8moveonly7useMoveyAA5KlassCADnF'
 func useMove(_ k: __owned Klass) -> Klass {
@@ -65,10 +65,10 @@ func useMove(_ k: __owned Klass) -> Klass {
 // CHECK-SIL-NEXT: debug_value
 // CHECK-SIL-NEXT: strong_retain
 // CHECK-SIL-NEXT: move_value
-// CHECK-SIL-NEXT: strong_release
 // CHECK-SIL-NEXT: debug_value [moved] undef
 // CHECK-SIL-NEXT: tuple
 // CHECK-SIL-NEXT: tuple
+// CHECK-SIL-NEXT: strong_release
 // CHECK-SIL-NEXT: return
 // CHECK-SIL: } // end sil function '$s8moveonly7useMoveyxxnRlzClF'
 func useMove<T : AnyObject>(_ k: __owned T) -> T {

test/sil-passpipeline-dump/basic.test-sh

@@ -2,7 +2,7 @@
 
 // CHECK: ---
 // CHECK: name:            non-Diagnostic Enabling Mandatory Optimizations
-// CHECK: passes:          [ "for-each-loop-unroll", "mandatory-combine", "mandatory-copy-propagation",
+// CHECK: passes:          [ "for-each-loop-unroll", "mandatory-combine",
 // CHECK: "mandatory-arc-opts" ]
 // CHECK: ---
 // CHECK: name:            Serialization