add SM 6.3 error test

Author: kmpeng

llvm/test/CodeGen/DirectX/dot2add_error.ll

@@ -0,0 +1,15 @@
+; RUN: not opt -S -dxil-op-lower -mtriple=dxil-pc-shadermodel6.3-compute %s 2>&1 | FileCheck %s
+
+; CHECK: in function f
+; CHECK-SAME: Cannot create Dot2AddHalf operation: No valid overloads for DXIL version 1.3
+
+define noundef float @f(<2 x half> noundef %a, <2 x half> noundef %b, float %acc) {
+entry:
+  %ax = extractelement <2 x half> %a, i32 0
+  %ay = extractelement <2 x half> %a, i32 1
+  %bx = extractelement <2 x half> %b, i32 0
+  %by = extractelement <2 x half> %b, i32 1
+  
+  %ret = call float @llvm.dx.dot2add(float %acc, half %ax, half %ay, half %bx, half %by)
+  ret float %ret
+}