diff --git a/clang/test/CodeGen/mozilla-ms-inline-asm.c b/clang/test/CodeGen/mozilla-ms-inline-asm.c
--- a/clang/test/CodeGen/mozilla-ms-inline-asm.c
+++ b/clang/test/CodeGen/mozilla-ms-inline-asm.c
@@ -27,7 +27,7 @@
 // CHECK-SAME: sub esp,eax
 // CHECK-SAME: mov ecx,esp
 // CHECK-SAME: push $0
-// CHECK-SAME: call dword ptr ${2:P}
+// CHECK-SAME: call ${2:P}
 // CHECK-SAME: {{.*}}__MSASMLABEL_.${:uid}__noparams:
 // CHECK-SAME: mov ecx,$3
 // CHECK-SAME: push ecx
diff --git a/clang/test/CodeGen/ms-inline-asm-64.c b/clang/test/CodeGen/ms-inline-asm-64.c
--- a/clang/test/CodeGen/ms-inline-asm-64.c
+++ b/clang/test/CodeGen/ms-inline-asm-64.c
@@ -68,7 +68,7 @@
   }
   // CHECK: t5
   // CHECK: call void asm sideeffect inteldialect
-  // CHECK-SAME: call qword ptr ${0:P}
-  // CHECK-SAME: jmp qword ptr ${1:P}
+  // CHECK-SAME: call ${0:P}
+  // CHECK-SAME: jmp ${1:P}
   // CHECK-SAME: "*m,*m,~{dirflag},~{fpsr},~{flags}"(ptr elementtype(void (...)) @bar, ptr elementtype(void (...)) @bar)
 }
diff --git a/clang/test/CodeGen/ms-inline-asm.c b/clang/test/CodeGen/ms-inline-asm.c
--- a/clang/test/CodeGen/ms-inline-asm.c
+++ b/clang/test/CodeGen/ms-inline-asm.c
@@ -312,7 +312,7 @@
 void t24(void) {
   __asm call t24_helper
 // CHECK: t24
-// CHECK: call void asm sideeffect inteldialect "call dword ptr ${0:P}", "*m,~{dirflag},~{fpsr},~{flags}"(ptr elementtype(void ()) @t24_helper)
+// CHECK: call void asm sideeffect inteldialect "call ${0:P}", "*m,~{dirflag},~{fpsr},~{flags}"(ptr elementtype(void ()) @t24_helper)
 }
 
 void t25(void) {
@@ -684,7 +684,7 @@
 void call_clobber(void) {
   __asm call t41
   // CHECK-LABEL: define{{.*}} void @call_clobber
-  // CHECK: call void asm sideeffect inteldialect "call dword ptr ${0:P}", "*m,~{dirflag},~{fpsr},~{flags}"(ptr elementtype(void (i16)) @t41)
+  // CHECK: call void asm sideeffect inteldialect "call ${0:P}", "*m,~{dirflag},~{fpsr},~{flags}"(ptr elementtype(void (i16)) @t41)
 }
 
 void xgetbv(void) {
diff --git a/clang/test/CodeGen/ms-inline-asm.cpp b/clang/test/CodeGen/ms-inline-asm.cpp
--- a/clang/test/CodeGen/ms-inline-asm.cpp
+++ b/clang/test/CodeGen/ms-inline-asm.cpp
@@ -109,7 +109,7 @@
   __asm mov x, eax
   // CHECK: call void asm sideeffect inteldialect
   // CHECK-SAME: push $0
-  // CHECK-SAME: call dword ptr ${2:P}
+  // CHECK-SAME: call ${2:P}
   // CHECK-SAME: mov $1, eax
   // CHECK-SAME: "=*m,=*m,*m,~{esp},~{dirflag},~{fpsr},~{flags}"(ptr elementtype(i32) %y, ptr elementtype(i32) %x, ptr elementtype(i32 (float)) @_ZN2T5IiE6createIfEEiT_)
 }
diff --git a/clang/test/CodeGen/ms_this.cpp b/clang/test/CodeGen/ms_this.cpp
--- a/clang/test/CodeGen/ms_this.cpp
+++ b/clang/test/CodeGen/ms_this.cpp
@@ -20,7 +20,7 @@
       mov rax,[this]
       // CHECK: [[THIS_ADDR_T2:%.+]] = alloca ptr
       // CHECK: [[THIS1_T2:%.+]] = load ptr, ptr [[THIS_ADDR_T2]],
-      // CHECK: call void asm sideeffect inteldialect "mov rax,qword ptr $1{{.*}}ptr [[THIS1_T2]]
+      // CHECK: call void asm sideeffect inteldialect "mov rax,$1\0A\09mov rbx,[rax]\0A\09mov $0, rbx", "=*m,m,~{rax},~{rbx},~{dirflag},~{fpsr},~{flags}"(ptr elementtype(double) %num, ptr [[THIS1_T2]])
       mov rbx,[rax]
       mov num, rbx
 	   };
@@ -33,7 +33,7 @@
        mov rax,[this]
        // CHECK: [[THIS_ADDR_T1:%.+]] = alloca ptr
        // CHECK: [[THIS1_T1:%.+]] = load ptr, ptr [[THIS_ADDR_T1]],
-       // CHECK: call void asm sideeffect inteldialect "mov rax,qword ptr $1{{.*}}ptr [[THIS1_T1]]
+       // CHECK: call void asm sideeffect inteldialect "mov rax,$1{{.*}}ptr [[THIS1_T1]]
         mov rbx,[rax]
         mov num, rbx
 	   };
@@ -46,7 +46,7 @@
     __asm mov rax, [this]
     // CHECK: [[THIS_ADDR_S:%.+]] = alloca ptr
     // CHECK: [[THIS1_S:%.+]] = load ptr, ptr [[THIS_ADDR_S]],
-    // CHECK: call void asm sideeffect inteldialect "mov rax, qword ptr $0{{.*}}ptr [[THIS1_S]]
+    // CHECK: call void asm sideeffect inteldialect "mov rax, $0{{.*}}ptr [[THIS1_S]]
   }
 } f3;
 
diff --git a/clang/test/CodeGenCXX/ms-inline-asm-fields.cpp b/clang/test/CodeGenCXX/ms-inline-asm-fields.cpp
--- a/clang/test/CodeGenCXX/ms-inline-asm-fields.cpp
+++ b/clang/test/CodeGenCXX/ms-inline-asm-fields.cpp
@@ -53,4 +53,4 @@
 // CHECK: %[[P:.*]] = alloca %"struct.make_storage_type<false>::type", align 4
 // CHECK: %[[B:.*]] = getelementptr inbounds %"struct.make_storage_type<false>::type", ptr %[[P]], i32 0, i32 0
 // CHECK: %[[X:.*]] = getelementptr inbounds %"struct.make_storage_type<false>::type::B", ptr %[[B]], i32 0, i32 1
-// CHECK: call void asm sideeffect inteldialect "mov edx, dword ptr $0", "*m,~{edx},~{dirflag},~{fpsr},~{flags}"(ptr elementtype(i32) %[[X]])
+// CHECK: call void asm sideeffect inteldialect "mov edx, $0", "*m,~{edx},~{dirflag},~{fpsr},~{flags}"(ptr elementtype(i32) %[[X]])
diff --git a/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp b/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
--- a/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
+++ b/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
@@ -1748,12 +1748,6 @@
   // If we found a decl other than a VarDecl, then assume it is a FuncDecl or
   // some other label reference.
   if (Info.isKind(InlineAsmIdentifierInfo::IK_Label)) {
-    // Insert an explicit size if the user didn't have one.
-    if (!Size) {
-      Size = getPointerWidth();
-      InstInfo->AsmRewrites->emplace_back(AOK_SizeDirective, Start,
-                                          /*Len=*/0, Size);
-    }
     // Create an absolute memory reference in order to match against
     // instructions taking a PC relative operand.
     Operands.push_back(X86Operand::CreateMem(getPointerWidth(), Disp, Start,