[llvm] [DirectX] Add support for Raw Buffer Loads and Stores for scalars and vectors of doubles and i64s in SM6.2 and earlier (PR #146627)

[Sarah Spall via llvm-commits]

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@@ -16,8 +16,10 @@ define void @storef64(double %0) {
   ; CHECK: [[Hi:%.*]] = extractvalue { i32, i32 } [[SD]], 1
   ; CHECK: [[Vec1:%.*]] = insertelement <2 x i32> poison, i32 [[Lo]], i32 0
   ; CHECK: [[Vec2:%.*]] = insertelement <2 x i32> [[Vec1]], i32 [[Hi]], i32 1
+  ; this shufflevector is unnecessary but generated to avoid specalization
+  ; CHECK: [[Vec3:%.*]] = shufflevector <2 x i32> [[Vec2]], <2 x i32> poison, <2 x i32> <i32 0, i32 1>
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spall wrote:

Ok maybe in that case i will try and remove it


https://github.com/llvm/llvm-project/pull/146627