[clang] [llvm] [HLSL][DXIL][SPIRV] Create llvm dot intrinsic and use for HLSL (PR #102872)

[Greg Roth via cfe-commits]

================
@@ -1045,6 +1045,15 @@ let IntrProperties = [IntrNoMem, IntrSpeculatable, 
IntrWillReturn] in {
   def int_nearbyint : DefaultAttrsIntrinsic<[llvm_anyfloat_ty], 
[LLVMMatchType<0>]>;
   def int_round : DefaultAttrsIntrinsic<[llvm_anyfloat_ty], 
[LLVMMatchType<0>]>;
   def int_roundeven    : DefaultAttrsIntrinsic<[llvm_anyfloat_ty], 
[LLVMMatchType<0>]>;
+  def int_udot : Intrinsic<[LLVMVectorElementType<0>],
+                           [llvm_anyint_ty, LLVMScalarOrSameVectorWidth<0, 
LLVMVectorElementType<0>>],
+                           [IntrNoMem, IntrWillReturn, Commutative] >;
+  def int_sdot : Intrinsic<[LLVMVectorElementType<0>],
+                           [llvm_anyint_ty, LLVMScalarOrSameVectorWidth<0, 
LLVMVectorElementType<0>>],
+                           [IntrNoMem, IntrWillReturn, Commutative] >;
+  def int_fdot : Intrinsic<[LLVMVectorElementType<0>],
----------------
pow2clk wrote:

The default properties seem to be 

* `IntrNoCallBack`
* `IntrNoSync`
* `IntrNoFree`
* `IntrWillReturn`

It seems we need to set `IntrNoMem` too then.

https://github.com/llvm/llvm-project/pull/102872
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