Index: llvm/trunk/include/llvm/Transforms/Vectorize/LoopVectorize.h
===================================================================
--- llvm/trunk/include/llvm/Transforms/Vectorize/LoopVectorize.h
+++ llvm/trunk/include/llvm/Transforms/Vectorize/LoopVectorize.h
@@ -76,15 +76,42 @@
 class TargetLibraryInfo;
 class TargetTransformInfo;
 
+struct LoopVectorizeOptions {
+  /// If false, consider all loops for interleaving.
+  /// If true, only loops that explicitly request interleaving are considered.
+  bool InterleaveOnlyWhenForced;
+
+  /// If false, consider all loops for vectorization.
+  /// If true, only loops that explicitly request vectorization are considered.
+  bool VectorizeOnlyWhenForced;
+
+  LoopVectorizeOptions()
+      : InterleaveOnlyWhenForced(false), VectorizeOnlyWhenForced(false) {}
+
+  LoopVectorizeOptions &setInterleaveOnlyWhenForced(bool Value) {
+    InterleaveOnlyWhenForced = Value;
+    return *this;
+  }
+
+  LoopVectorizeOptions &setVectorizeOnlyWhenForced(bool Value) {
+    VectorizeOnlyWhenForced = Value;
+    return *this;
+  }
+};
+
 /// The LoopVectorize Pass.
 struct LoopVectorizePass : public PassInfoMixin<LoopVectorizePass> {
   /// If false, consider all loops for interleaving.
   /// If true, only loops that explicitly request interleaving are considered.
-  bool InterleaveOnlyWhenForced = false;
+  bool InterleaveOnlyWhenForced;
 
   /// If false, consider all loops for vectorization.
   /// If true, only loops that explicitly request vectorization are considered.
-  bool VectorizeOnlyWhenForced = false;
+  bool VectorizeOnlyWhenForced;
+
+  LoopVectorizePass(LoopVectorizeOptions Opts = {})
+      : InterleaveOnlyWhenForced(Opts.InterleaveOnlyWhenForced),
+        VectorizeOnlyWhenForced(Opts.VectorizeOnlyWhenForced) {}
 
   ScalarEvolution *SE;
   LoopInfo *LI;
Index: llvm/trunk/lib/Passes/PassBuilder.cpp
===================================================================
--- llvm/trunk/lib/Passes/PassBuilder.cpp
+++ llvm/trunk/lib/Passes/PassBuilder.cpp
@@ -1469,6 +1469,27 @@
   return Result;
 }
 
+/// Parser of parameters for LoopVectorize pass.
+Expected<LoopVectorizeOptions> parseLoopVectorizeOptions(StringRef Params) {
+  LoopVectorizeOptions Opts;
+  while (!Params.empty()) {
+    StringRef ParamName;
+    std::tie(ParamName, Params) = Params.split(';');
+
+    bool Enable = !ParamName.consume_front("no-");
+    if (ParamName == "interleave-forced-only") {
+      Opts.setInterleaveOnlyWhenForced(Enable);
+    } else if (ParamName == "vectorize-forced-only") {
+      Opts.setVectorizeOnlyWhenForced(Enable);
+    } else {
+      return make_error<StringError>(
+          formatv("invalid LoopVectorize parameter '{0}' ", ParamName).str(),
+          inconvertibleErrorCode());
+    }
+  }
+  return Opts;
+}
+
 } // namespace
 
 /// Tests whether a pass name starts with a valid prefix for a default pipeline
Index: llvm/trunk/lib/Passes/PassRegistry.def
===================================================================
--- llvm/trunk/lib/Passes/PassRegistry.def
+++ llvm/trunk/lib/Passes/PassRegistry.def
@@ -199,7 +199,6 @@
 FUNCTION_PASS("loop-load-elim", LoopLoadEliminationPass())
 FUNCTION_PASS("loop-fuse", LoopFusePass())
 FUNCTION_PASS("loop-distribute", LoopDistributePass())
-FUNCTION_PASS("loop-vectorize", LoopVectorizePass())
 FUNCTION_PASS("pgo-memop-opt", PGOMemOPSizeOpt())
 FUNCTION_PASS("print", PrintFunctionPass(dbgs()))
 FUNCTION_PASS("print<assumptions>", AssumptionPrinterPass(dbgs()))
@@ -258,6 +257,11 @@
                              return SimplifyCFGPass(Opts);
                            },
                            parseSimplifyCFGOptions)
+FUNCTION_PASS_WITH_PARAMS("loop-vectorize",
+                           [](LoopVectorizeOptions Opts) {
+                             return LoopVectorizePass(Opts);
+                           },
+                           parseLoopVectorizeOptions)
 #undef FUNCTION_PASS_WITH_PARAMS
 
 #ifndef LOOP_ANALYSIS