Index: include/llvm/IR/IntrinsicsX86.td
===================================================================
--- include/llvm/IR/IntrinsicsX86.td
+++ include/llvm/IR/IntrinsicsX86.td
@@ -1680,20 +1680,6 @@
                   [IntrReadMem, IntrArgMemOnly]>;
 }
 
-// Conditional move ops
-let TargetPrefix = "x86" in {  // All intrinsics start with "llvm.x86.".
-  def int_x86_avx512_mask_move_ss :
-        GCCBuiltin<"__builtin_ia32_movss_mask">,
-          Intrinsic<[llvm_v4f32_ty],
-                    [llvm_v4f32_ty, llvm_v4f32_ty, llvm_v4f32_ty, llvm_i8_ty],
-                    [IntrNoMem]>;
-  def int_x86_avx512_mask_move_sd :
-        GCCBuiltin<"__builtin_ia32_movsd_mask">,
-          Intrinsic<[llvm_v2f64_ty],
-                    [llvm_v2f64_ty, llvm_v2f64_ty, llvm_v2f64_ty, llvm_i8_ty],
-                    [IntrNoMem]>;
-}
-
 // Conditional store ops
 let TargetPrefix = "x86" in {  // All intrinsics start with "llvm.x86.".
   def int_x86_avx_maskstore_pd : GCCBuiltin<"__builtin_ia32_maskstorepd">,
Index: lib/IR/AutoUpgrade.cpp
===================================================================
--- lib/IR/AutoUpgrade.cpp
+++ lib/IR/AutoUpgrade.cpp
@@ -338,6 +338,8 @@
          Name.startswith("avx2.pblendd.") ||
          Name.startswith("avx.vbroadcastf128") ||
          Name == "avx2.vbroadcasti128" ||
+         Name.startswith("avx512.mask.move.ss") ||
+         Name.startswith("avx512.mask.move.sd") ||
          Name == "xop.vpcmov" ||
          (Name.startswith("xop.vpcom") && F->arg_size() == 2))) {
       NewFn = nullptr;
@@ -675,6 +677,20 @@
                                                      std::max(NumElts, 8U)));
 }
 
+static Value* upgradeMaskedMove(IRBuilder<> &Builder, CallInst &CI) {
+  Value* a = CI.getArgOperand(0);
+  Value* b = CI.getArgOperand(1);
+  Value* src = CI.getArgOperand(2);
+  Value* mask = CI.getArgOperand(3);
+
+  Value* andNode = Builder.CreateAnd(mask, APInt(8, 1));
+  Value* cmp = Builder.CreateIsNotNull(andNode);
+  Value* extract1 = Builder.CreateExtractElement(b, (uint64_t)0);
+  Value* extract2 = Builder.CreateExtractElement(src, (uint64_t)0);
+  Value* select = Builder.CreateSelect(cmp, extract1, extract2);
+  return Builder.CreateInsertElement(a, select, (uint64_t)0);
+}
+
 /// Upgrade a call to an old intrinsic. All argument and return casting must be
 /// provided to seamlessly integrate with existing context.
 void llvm::UpgradeIntrinsicCall(CallInst *CI, Function *NewFn) {
@@ -1332,6 +1348,9 @@
       Rep = Builder.CreateFSub(CI->getArgOperand(0), CI->getArgOperand(1));
       Rep = EmitX86Select(Builder, CI->getArgOperand(3), Rep,
                           CI->getArgOperand(2));
+    } else if (IsX86 && (Name.startswith("avx512.mask.move.ss") ||
+                         Name.startswith("avx512.mask.move.sd"))) { 
+      Rep = upgradeMaskedMove(Builder, *CI);
     } else {
       llvm_unreachable("Unknown function for CallInst upgrade.");
     }
Index: lib/Target/X86/X86IntrinsicsInfo.h
===================================================================
--- lib/Target/X86/X86IntrinsicsInfo.h
+++ lib/Target/X86/X86IntrinsicsInfo.h
@@ -788,10 +788,6 @@
                      X86ISD::FMIN_RND, 0),
   X86_INTRINSIC_DATA(avx512_mask_min_ss_round, INTR_TYPE_SCALAR_MASK_RM,
                      X86ISD::FMIN_RND, 0),
-  X86_INTRINSIC_DATA(avx512_mask_move_sd, INTR_TYPE_SCALAR_MASK,
-                     X86ISD::MOVSD, 0),
-  X86_INTRINSIC_DATA(avx512_mask_move_ss, INTR_TYPE_SCALAR_MASK,
-                     X86ISD::MOVSS, 0),
   X86_INTRINSIC_DATA(avx512_mask_mul_pd_512, INTR_TYPE_2OP_MASK, ISD::FMUL,
                      X86ISD::FMUL_RND),
   X86_INTRINSIC_DATA(avx512_mask_mul_ps_512, INTR_TYPE_2OP_MASK, ISD::FMUL,
Index: test/CodeGen/X86/avx512-intrinsics-upgrade.ll
===================================================================
--- test/CodeGen/X86/avx512-intrinsics-upgrade.ll
+++ test/CodeGen/X86/avx512-intrinsics-upgrade.ll
@@ -1765,3 +1765,51 @@
   ret <8 x i64> %res2
 }
 
+define <4 x float> @test_mm_mask_move_ss(<4 x float> %__W, i8 zeroext %__U, <4 x float> %__A, <4 x float> %__B) {
+; CHECK-LABEL: test_mm_mask_move_ss:
+; CHECK:       ## BB#0: ## %entry
+; CHECK-NEXT:    kmovw %edi, %k1
+; CHECK-NEXT:    vmovss %xmm2, %xmm1, %xmm0 {%k1}
+; CHECK-NEXT:    retq
+entry:
+  %res = call <4 x float> @llvm.x86.avx512.mask.move.ss(<4 x float> %__A, <4 x float> %__B, <4 x float> %__W, i8 %__U)
+  ret <4 x float> %res
+}
+
+
+define <4 x float> @test_mm_maskz_move_ss(i8 zeroext %__U, <4 x float> %__A, <4 x float> %__B) {
+; CHECK-LABEL: test_mm_maskz_move_ss:
+; CHECK:       ## BB#0: ## %entry
+; CHECK-NEXT:    kmovw %edi, %k1
+; CHECK-NEXT:    vmovss %xmm1, %xmm0, %xmm0 {%k1} {z}
+; CHECK-NEXT:    retq
+entry:
+  %res = call <4 x float> @llvm.x86.avx512.mask.move.ss(<4 x float> %__A, <4 x float> %__B, <4 x float> zeroinitializer, i8 %__U)
+  ret <4 x float> %res
+}
+
+define <2 x double> @test_mm_mask_move_sd(<2 x double> %__W, i8 zeroext %__U, <2 x double> %__A, <2 x double> %__B) {
+; CHECK-LABEL: test_mm_mask_move_sd:
+; CHECK:       ## BB#0: ## %entry
+; CHECK-NEXT:    kmovw %edi, %k1
+; CHECK-NEXT:    vmovsd %xmm2, %xmm1, %xmm0 {%k1}
+; CHECK-NEXT:    retq
+entry:
+  %res = call <2 x double> @llvm.x86.avx512.mask.move.sd(<2 x double> %__A, <2 x double> %__B, <2 x double> %__W, i8 %__U)
+  ret <2 x double> %res
+}
+
+define <2 x double> @test_mm_maskz_move_sd(i8 zeroext %__U, <2 x double> %__A, <2 x double> %__B) {
+; CHECK-LABEL: test_mm_maskz_move_sd:
+; CHECK:       ## BB#0: ## %entry
+; CHECK-NEXT:    kmovw %edi, %k1
+; CHECK-NEXT:    vmovsd %xmm1, %xmm0, %xmm0 {%k1} {z}
+; CHECK-NEXT:    retq
+entry:
+  %res = call <2 x double> @llvm.x86.avx512.mask.move.sd(<2 x double> %__A, <2 x double> %__B, <2 x double> zeroinitializer, i8 %__U)
+  ret <2 x double> %res
+}
+
+declare <4 x float> @llvm.x86.avx512.mask.move.ss(<4 x float>, <4 x float>, <4 x float>, i8)
+
+declare <2 x double> @llvm.x86.avx512.mask.move.sd(<2 x double>, <2 x double>, <2 x double>, i8)