Index: llvm/lib/Transforms/Scalar/LoopSink.cpp
===================================================================
--- llvm/lib/Transforms/Scalar/LoopSink.cpp
+++ llvm/lib/Transforms/Scalar/LoopSink.cpp
@@ -70,11 +70,11 @@
     cl::desc("Do not sink instructions that have too many uses."));
 
 static cl::opt<bool> EnableMSSAInLoopSink(
-    "enable-mssa-in-loop-sink", cl::Hidden, cl::init(false),
+    "enable-mssa-in-loop-sink", cl::Hidden, cl::init(true),
     cl::desc("Enable MemorySSA for LoopSink in new pass manager"));
 
 static cl::opt<bool> EnableMSSAInLegacyLoopSink(
-    "enable-mssa-in-legacy-loop-sink", cl::Hidden, cl::init(false),
+    "enable-mssa-in-legacy-loop-sink", cl::Hidden, cl::init(true),
     cl::desc("Enable MemorySSA for LoopSink in legacy pass manager"));
 
 /// Return adjusted total frequency of \p BBs.
Index: llvm/test/CodeGen/AMDGPU/opt-pipeline.ll
===================================================================
--- llvm/test/CodeGen/AMDGPU/opt-pipeline.ll
+++ llvm/test/CodeGen/AMDGPU/opt-pipeline.ll
@@ -300,6 +300,7 @@
 ; GCN-O1-NEXT:       Basic Alias Analysis (stateless AA impl)
 ; GCN-O1-NEXT:       Function Alias Analysis Results
 ; GCN-O1-NEXT:       Scalar Evolution Analysis
+; GCN-O1-NEXT:       Memory SSA
 ; GCN-O1-NEXT:       Block Frequency Analysis
 ; GCN-O1-NEXT:       Loop Pass Manager
 ; GCN-O1-NEXT:         Loop Sink
@@ -659,6 +660,7 @@
 ; GCN-O2-NEXT:       Basic Alias Analysis (stateless AA impl)
 ; GCN-O2-NEXT:       Function Alias Analysis Results
 ; GCN-O2-NEXT:       Scalar Evolution Analysis
+; GCN-O2-NEXT:       Memory SSA
 ; GCN-O2-NEXT:       Block Frequency Analysis
 ; GCN-O2-NEXT:       Loop Pass Manager
 ; GCN-O2-NEXT:         Loop Sink
@@ -1023,6 +1025,7 @@
 ; GCN-O3-NEXT:       Basic Alias Analysis (stateless AA impl)
 ; GCN-O3-NEXT:       Function Alias Analysis Results
 ; GCN-O3-NEXT:       Scalar Evolution Analysis
+; GCN-O3-NEXT:       Memory SSA
 ; GCN-O3-NEXT:       Block Frequency Analysis
 ; GCN-O3-NEXT:       Loop Pass Manager
 ; GCN-O3-NEXT:         Loop Sink
Index: llvm/test/Other/opt-O2-pipeline.ll
===================================================================
--- llvm/test/Other/opt-O2-pipeline.ll
+++ llvm/test/Other/opt-O2-pipeline.ll
@@ -303,6 +303,7 @@
 ; CHECK-NEXT:       Basic Alias Analysis (stateless AA impl)
 ; CHECK-NEXT:       Function Alias Analysis Results
 ; CHECK-NEXT:       Scalar Evolution Analysis
+; CHECK-NEXT:       Memory SSA
 ; CHECK-NEXT:       Block Frequency Analysis
 ; CHECK-NEXT:       Loop Pass Manager
 ; CHECK-NEXT:         Loop Sink
Index: llvm/test/Other/opt-O3-pipeline-enable-matrix.ll
===================================================================
--- llvm/test/Other/opt-O3-pipeline-enable-matrix.ll
+++ llvm/test/Other/opt-O3-pipeline-enable-matrix.ll
@@ -315,6 +315,7 @@
 ; CHECK-NEXT:       Basic Alias Analysis (stateless AA impl)
 ; CHECK-NEXT:       Function Alias Analysis Results
 ; CHECK-NEXT:       Scalar Evolution Analysis
+; CHECK-NEXT:       Memory SSA
 ; CHECK-NEXT:       Block Frequency Analysis
 ; CHECK-NEXT:       Loop Pass Manager
 ; CHECK-NEXT:         Loop Sink
Index: llvm/test/Other/opt-O3-pipeline.ll
===================================================================
--- llvm/test/Other/opt-O3-pipeline.ll
+++ llvm/test/Other/opt-O3-pipeline.ll
@@ -308,6 +308,7 @@
 ; CHECK-NEXT:       Basic Alias Analysis (stateless AA impl)
 ; CHECK-NEXT:       Function Alias Analysis Results
 ; CHECK-NEXT:       Scalar Evolution Analysis
+; CHECK-NEXT:       Memory SSA
 ; CHECK-NEXT:       Block Frequency Analysis
 ; CHECK-NEXT:       Loop Pass Manager
 ; CHECK-NEXT:         Loop Sink
Index: llvm/test/Other/opt-Os-pipeline.ll
===================================================================
--- llvm/test/Other/opt-Os-pipeline.ll
+++ llvm/test/Other/opt-Os-pipeline.ll
@@ -289,6 +289,7 @@
 ; CHECK-NEXT:       Basic Alias Analysis (stateless AA impl)
 ; CHECK-NEXT:       Function Alias Analysis Results
 ; CHECK-NEXT:       Scalar Evolution Analysis
+; CHECK-NEXT:       Memory SSA
 ; CHECK-NEXT:       Block Frequency Analysis
 ; CHECK-NEXT:       Loop Pass Manager
 ; CHECK-NEXT:         Loop Sink