[clang] [llvm] [HLSL] Implement ddx/ddy_coarse intrinsics (PR #164831)

[Farzon Lotfi via llvm-commits]

================
@@ -0,0 +1,15 @@
+; RUN: not opt -S -dxil-op-lower -mtriple=dxil-pc-shadermodel6.3-library %s 2>&1 | FileCheck %s
+
+; DXIL operation ddx.coarse does not support double overload type
+; CHECK: in function ddx.coarse
+; CHECK-SAME: Cannot create DerivCoarseX operation: Invalid overload type
+
+; Function Attrs: noinline nounwind optnone
+define noundef double @ddx.coarse_double(double noundef %a) #0 {
+entry:
+  %a.addr = alloca double, align 8
+  store double %a, ptr %a.addr, align 8
+  %0 = load double, ptr %a.addr, align 8
+  %dx.ddx.coarse = call double @llvm.dx.ddx.coarse.f64(double %0)
+  ret double %dx.ddx.coarse
+}
----------------
farzonl wrote:

add a new line

https://github.com/llvm/llvm-project/pull/164831