diff --git a/include/llvm/IR/IntrinsicsX86.td b/include/llvm/IR/IntrinsicsX86.td
index 427cb50a730..671dde89c1c 100644
--- a/include/llvm/IR/IntrinsicsX86.td
+++ b/include/llvm/IR/IntrinsicsX86.td
@@ -3882,10 +3882,10 @@ let TargetPrefix = "x86" in {
 // Misc.
 let TargetPrefix = "x86" in {
   def int_x86_avx512_mask_cmp_ps_512 : GCCBuiltin<"__builtin_ia32_cmpps512_mask">,
-            Intrinsic<[llvm_i16_ty], [llvm_v16f32_ty, llvm_v16f32_ty, llvm_i32_ty,
+            Intrinsic<[llvm_i16_ty], [llvm_v16f32_ty, llvm_v16f32_ty, llvm_i8_ty,
                                       llvm_i16_ty, llvm_i32_ty], [IntrNoMem]>;
   def int_x86_avx512_mask_cmp_pd_512 : GCCBuiltin<"__builtin_ia32_cmppd512_mask">,
-            Intrinsic<[llvm_i8_ty], [llvm_v8f64_ty, llvm_v8f64_ty, llvm_i32_ty,
+            Intrinsic<[llvm_i8_ty], [llvm_v8f64_ty, llvm_v8f64_ty, llvm_i8_ty,
                                       llvm_i8_ty, llvm_i32_ty], [IntrNoMem]>;
   def int_x86_avx512_mask_pand_d_512 : GCCBuiltin<"__builtin_ia32_pandd512_mask">,
             Intrinsic<[llvm_v16i32_ty], [llvm_v16i32_ty, llvm_v16i32_ty,
diff --git a/lib/IR/AutoUpgrade.cpp b/lib/IR/AutoUpgrade.cpp
index e3544dfa9e0..e734c7f0e06 100644
--- a/lib/IR/AutoUpgrade.cpp
+++ b/lib/IR/AutoUpgrade.cpp
@@ -60,6 +60,21 @@ static bool UpgradeX86IntrinsicsWith8BitMask(Function *F, Intrinsic::ID IID,
   return true;
 }
 
+// Upgrade the declarations of AVX-512 cmp intrinsic functions whose 8-bit
+// immediates have changed their type from i32 to i8.
+static bool UpgradeAVX512CmpIntrinsic(Function *F, Intrinsic::ID IID,
+                                      Function *&NewFn) {
+  // Check that the last argument is an i32.
+  Type *LastArgType = F->getFunctionType()->getParamType(2);
+  if (!LastArgType->isIntegerTy(32))
+    return false;
+
+  // Move this function aside and map down.
+  F->setName(F->getName() + ".old");
+  NewFn = Intrinsic::getDeclaration(F->getParent(), IID);
+  return true;
+}
+
 static bool UpgradeIntrinsicFunction1(Function *F, Function *&NewFn) {
   assert(F && "Illegal to upgrade a non-existent Function.");
 
@@ -206,6 +221,13 @@ static bool UpgradeIntrinsicFunction1(Function *F, Function *&NewFn) {
       return UpgradeX86IntrinsicsWith8BitMask(F, Intrinsic::x86_avx2_mpsadbw,
                                               NewFn);
 
+    if (Name == "x86.avx512.mask.cmp.ps.512")
+      return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_cmp_ps_512,
+                                       NewFn);
+    if (Name == "x86.avx512.mask.cmp.pd.512")
+      return UpgradeAVX512CmpIntrinsic(F, Intrinsic::x86_avx512_mask_cmp_pd_512,
+                                       NewFn);
+
     // frcz.ss/sd may need to have an argument dropped
     if (Name.startswith("x86.xop.vfrcz.ss") && F->arg_size() == 2) {
       F->setName(Name + ".old");
@@ -547,6 +569,21 @@ void llvm::UpgradeIntrinsicCall(CallInst *CI, Function *NewFn) {
     CI->eraseFromParent();
     return;
   }
+  case Intrinsic::x86_avx512_mask_cmp_ps_512:
+  case Intrinsic::x86_avx512_mask_cmp_pd_512: {
+    // Need to truncate the last argument from i32 to i8 -- this argument models
+    // an inherently 8-bit immediate operand to these x86 instructions.
+    SmallVector<Value *, 5> Args(CI->arg_operands().begin(),
+                                 CI->arg_operands().end());
+
+    // Replace the last argument with a trunc.
+    Args[2] = Builder.CreateTrunc(Args[2], Type::getInt8Ty(C), "trunc");
+
+    CallInst *NewCall = Builder.CreateCall(NewFn, Args);
+    CI->replaceAllUsesWith(NewCall);
+    CI->eraseFromParent();
+    return;
+  }
   }
 }
 
diff --git a/lib/Target/X86/X86InstrAVX512.td b/lib/Target/X86/X86InstrAVX512.td
index ff3587c1c9e..573544c5920 100644
--- a/lib/Target/X86/X86InstrAVX512.td
+++ b/lib/Target/X86/X86InstrAVX512.td
@@ -1577,25 +1577,25 @@ def : Pat<(v8i1 (X86cmpmu (v8i32 VR256X:$src1), (v8i32 VR256X:$src2), imm:$cc)),
             imm:$cc), VK8)>;
 
 def : Pat<(i16 (int_x86_avx512_mask_cmp_ps_512 (v16f32 VR512:$src1),
-                (v16f32 VR512:$src2), i32immZExt5:$cc, (i16 -1),
+                (v16f32 VR512:$src2), i8immZExt5:$cc, (i16 -1),
                  FROUND_NO_EXC)),
           (COPY_TO_REGCLASS (VCMPPSZrrib VR512:$src1, VR512:$src2,
                              (I8Imm imm:$cc)), GR16)>;
 
 def : Pat<(i8 (int_x86_avx512_mask_cmp_pd_512 (v8f64 VR512:$src1),
-                (v8f64 VR512:$src2), i32immZExt5:$cc, (i8 -1),
+                (v8f64 VR512:$src2), i8immZExt5:$cc, (i8 -1),
                  FROUND_NO_EXC)),
           (COPY_TO_REGCLASS (VCMPPDZrrib VR512:$src1, VR512:$src2,
                              (I8Imm imm:$cc)), GR8)>;
 
 def : Pat<(i16 (int_x86_avx512_mask_cmp_ps_512 (v16f32 VR512:$src1),
-                (v16f32 VR512:$src2), i32immZExt5:$cc, (i16 -1),
+                (v16f32 VR512:$src2), i8immZExt5:$cc, (i16 -1),
                 FROUND_CURRENT)),
           (COPY_TO_REGCLASS (VCMPPSZrri VR512:$src1, VR512:$src2,
                              (I8Imm imm:$cc)), GR16)>;
 
 def : Pat<(i8 (int_x86_avx512_mask_cmp_pd_512 (v8f64 VR512:$src1),
-                (v8f64 VR512:$src2), i32immZExt5:$cc, (i8 -1),
+                (v8f64 VR512:$src2), i8immZExt5:$cc, (i8 -1),
                  FROUND_CURRENT)),
           (COPY_TO_REGCLASS (VCMPPDZrri VR512:$src1, VR512:$src2,
                              (I8Imm imm:$cc)), GR8)>;
diff --git a/lib/Target/X86/X86InstrInfo.td b/lib/Target/X86/X86InstrInfo.td
index 53715dc6dd3..64e4636b1ac 100644
--- a/lib/Target/X86/X86InstrInfo.td
+++ b/lib/Target/X86/X86InstrInfo.td
@@ -555,10 +555,6 @@ def AVXCC : Operand<i8> {
 def i8immZExt5 : ImmLeaf<i8, [{
   return Imm >= 0 && Imm < 32;
 }]>;
-// AVX-512 uses a 32-bit immediate in their intrinsics
-def i32immZExt5 : ImmLeaf<i32, [{
-  return Imm >= 0 && Imm < 32;
-}]>;
 
 class ImmSExtAsmOperandClass : AsmOperandClass {
   let SuperClasses = [ImmAsmOperand];