[clang] [llvm] [NVPTX] Add builtins and intrinsics for conversions of new FP types (PR #134345)

[Alex MacLean via cfe-commits]

================
@@ -703,6 +703,46 @@ let hasSideEffects = false in {
   defm CVT_to_tf32_rz_satf : CVT_TO_TF32<"rz.satfinite", [hasPTX<86>, 
hasSM<100>]>;
   defm CVT_to_tf32_rn_relu_satf  : CVT_TO_TF32<"rn.relu.satfinite", 
[hasPTX<86>, hasSM<100>]>;
   defm CVT_to_tf32_rz_relu_satf  : CVT_TO_TF32<"rz.relu.satfinite", 
[hasPTX<86>, hasSM<100>]>;
+
+  // FP6 conversions.
+  class CVT_f32_to_f6x2<string F6x2Name>
+    : NVPTXInst<(outs Int16Regs:$dst),
+                (ins Float32Regs:$src1, Float32Regs:$src2, CvtMode:$mode),
+                !strconcat("cvt${mode:base}.satfinite${mode:relu}.",
----------------
AlexMaclean wrote:

Nit: for simple cases like this, `#` is preferable over `!strconcat`

https://github.com/llvm/llvm-project/pull/134345
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