[PATCH] D155851: [llvm][nvptx] Add sm_90a

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This works adds `sm_90a` as nvptx target. `sm_90a` is required to generate  wgmma and setmaxnreg instructions.

Here is information about "a" prefix in PTX document:
Target architectures with suffix “a”, such as sm_90a, include architecture-accelerated features that are supported on the specified architecture only, hence such targets do not follow the onion layer model. Therefore, PTX code generated for such targets cannot be run on later generation devices. Architecture-accelerated features can only be used with targets that support these features.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D155851

Files:
  llvm/lib/Target/NVPTX/NVPTX.td


Index: llvm/lib/Target/NVPTX/NVPTX.td
===================================================================
--- llvm/lib/Target/NVPTX/NVPTX.td
+++ llvm/lib/Target/NVPTX/NVPTX.td
@@ -41,6 +41,7 @@
                    70, 71, 72, 73, 74, 75, 76, 77, 78, 80, 81] in
   def PTX#version: FeaturePTX<version>;
 
+def SM90a: FeatureSM<90>;
 //===----------------------------------------------------------------------===//
 // NVPTX supported processors.
 //===----------------------------------------------------------------------===//
@@ -68,6 +69,7 @@
 def : Proc<"sm_87", [SM87, PTX74]>;
 def : Proc<"sm_89", [SM89, PTX78]>;
 def : Proc<"sm_90", [SM90, PTX78]>;
+def : Proc<"sm_90a", [SM90a, PTX80]>;
 
 def NVPTXInstrInfo : InstrInfo {
 }


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