[ms-inline-asm] Use the frontend size only for ambiguous instructions

This avoids problems on code like this:
  char buf[16];
  __asm {
    movups xmm0, [buf]
    mov [buf], eax
  }

The frontend size in this case (1) is wrong, and the register makes the
instruction matching unambiguous. There are also enough bytes available
that we shouldn't complain to the user that they are potentially using
an incorrectly sized instruction to access the variable.

Supersedes D32636 and D26586 and fixes PR28266

llvm-svn: 302179

1 files changed, 2 insertions, 2 deletions

diff --git a/clang/test/CodeGenCXX/ms-inline-asm-fields.cpp b/clang/test/CodeGenCXX/ms-inline-asm-fields.cpp
index 6f329330bda..5ee6acf5746 100644
--- a/clang/test/CodeGenCXX/ms-inline-asm-fields.cpp
+++ b/clang/test/CodeGenCXX/ms-inline-asm-fields.cpp
@@ -17,14 +17,14 @@ A a_global;
 extern "C" int test_param_field(A p) {
 // CHECK: define i32 @test_param_field(%struct.A* byval align 4 %p)
 // CHECK: getelementptr inbounds %struct.A, %struct.A* %p, i32 0, i32 0
-// CHECK: call i32 asm sideeffect inteldialect "mov eax, dword ptr $1"
+// CHECK: call i32 asm sideeffect inteldialect "mov eax, $1"
 // CHECK: ret i32
   __asm mov eax, p.a1
 }
 
 extern "C" int test_namespace_global() {
 // CHECK: define i32 @test_namespace_global()
-// CHECK: call i32 asm sideeffect inteldialect "mov eax, dword ptr $1", "{{.*}}"(i32* getelementptr inbounds (%struct.A, %struct.A* @_ZN4asdf8a_globalE, i32 0, i32 2, i32 1))
+// CHECK: call i32 asm sideeffect inteldialect "mov eax, $1", "{{.*}}"(i32* getelementptr inbounds (%struct.A, %struct.A* @_ZN4asdf8a_globalE, i32 0, i32 2, i32 1))
 // CHECK: ret i32
   __asm mov eax, asdf::a_global.a3.b2
 }