Index: docs/LangRef.rst
===================================================================
--- docs/LangRef.rst
+++ docs/LangRef.rst
@@ -5610,6 +5610,17 @@
 
    !0 = !{!"llvm.loop.licm_versioning.disable"}
 
+'``llvm.loop.licm.disable``' Metadata
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+This metadata indicates that loop-invariant code motion (LICM) should not be
+performed  on this loop. The metadata has a single operand which is the string
+``llvm.loop.licm.disable``. For example:
+
+.. code-block:: llvm
+
+   !0 = !{!"llvm.loop.licm.disable"}
+
 '``llvm.loop.distribute.enable``' Metadata
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
Index: include/llvm/Transforms/Utils/LoopUtils.h
===================================================================
--- include/llvm/Transforms/Utils/LoopUtils.h
+++ include/llvm/Transforms/Utils/LoopUtils.h
@@ -215,6 +215,9 @@
 /// Look for the loop attribute that disables all transformation heuristic.
 bool hasDisableAllTransformsHint(const Loop *L);
 
+/// Look for the loop attribute that disables the LICM transformation heuristics.
+bool hasDisableLICMTransformsHint(const Loop *L);
+
 /// The mode sets how eager a transformation should be applied.
 enum TransformationMode {
   /// The pass can use heuristics to determine whether a transformation should
Index: lib/Transforms/Scalar/LICM.cpp
===================================================================
--- lib/Transforms/Scalar/LICM.cpp
+++ lib/Transforms/Scalar/LICM.cpp
@@ -330,6 +330,12 @@
 
   assert(L->isLCSSAForm(*DT) && "Loop is not in LCSSA form.");
 
+  // If this loop has metadata indicating that LICM is not to be performed then
+  // just exit.
+  if (hasDisableLICMTransformsHint(L)) {
+    return false;
+  }
+
   std::unique_ptr<AliasSetTracker> CurAST;
   std::unique_ptr<MemorySSAUpdater> MSSAU;
   bool NoOfMemAccTooLarge = false;
Index: lib/Transforms/Utils/LoopUtils.cpp
===================================================================
--- lib/Transforms/Utils/LoopUtils.cpp
+++ lib/Transforms/Utils/LoopUtils.cpp
@@ -45,6 +45,7 @@
 #define DEBUG_TYPE "loop-utils"
 
 static const char *LLVMLoopDisableNonforced = "llvm.loop.disable_nonforced";
+static const char *LLVMLoopDisableLICM = "llvm.loop.licm.disable";
 
 bool llvm::formDedicatedExitBlocks(Loop *L, DominatorTree *DT, LoopInfo *LI,
                                    MemorySSAUpdater *MSSAU,
@@ -332,6 +333,10 @@
   return getBooleanLoopAttribute(L, LLVMLoopDisableNonforced);
 }
 
+bool llvm::hasDisableLICMTransformsHint(const Loop *L) {
+  return getBooleanLoopAttribute(L, LLVMLoopDisableLICM);
+}
+
 TransformationMode llvm::hasUnrollTransformation(Loop *L) {
   if (getBooleanLoopAttribute(L, "llvm.loop.unroll.disable"))
     return TM_SuppressedByUser;
Index: test/Transforms/LICM/pragma-licm-disable.ll
===================================================================
--- /dev/null
+++ test/Transforms/LICM/pragma-licm-disable.ll
@@ -0,0 +1,52 @@
+; Check that the LICM pass does not operate on a loop which has the
+; llvm.loop.licm.disable metadata.
+; This test is simply a modified copy of constexpr.ll 
+
+; RUN: opt < %s -S -basicaa -licm | FileCheck %s
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-pc-windows-msvc"
+
+@in = internal unnamed_addr global i32* null, align 8
+@out = internal unnamed_addr global i32* null, align 8
+
+; CHECK-LABEL: @licm_disable
+; CHECK: entry:
+; CHECK-NOT: load
+; CHECK: do.body:
+; CHECK: load i64, i64* bitcast (i32** @in to i64*)
+
+define i64 @licm_disable(i32 %N) {
+entry:
+  br label %do.body
+
+do.body:                                          ; preds = %l2, %entry
+  %i.0 = phi i32 [ 0, %entry ], [ %inc, %l2 ]
+  %total = phi i64 [ 0, %entry ], [ %next, %l2 ]
+  %c = icmp eq i32 %N, 6
+  br i1 %c, label %l1, label %do.body.l2_crit_edge
+
+do.body.l2_crit_edge:                             ; preds = %do.body
+  %inval.pre = load i32*, i32** @in, align 8
+  br label %l2
+
+l1:                                               ; preds = %do.body
+  %v1 = load i64, i64* bitcast (i32** @in to i64*), align 8
+  store i64 %v1, i64* bitcast (i32** @out to i64*), align 8
+  %0 = inttoptr i64 %v1 to i32*
+  br label %l2
+
+l2:                                               ; preds = %do.body.l2_crit_edge, %l1
+  %inval = phi i32* [ %inval.pre, %do.body.l2_crit_edge ], [ %0, %l1 ]
+  %int = ptrtoint i32* %inval to i64
+  %next = add i64 %total, %int
+  %inc = add nsw i32 %i.0, 1
+  %cmp = icmp slt i32 %inc, %N
+  br i1 %cmp, label %do.body, label %do.end, !llvm.loop !1
+
+do.end:                                           ; preds = %l2
+  ret i64 %total
+}
+!1 = !{!1, !2}
+!2 = !{!"llvm.loop.licm.disable"}
+