[llvm] [NVPTX] Add unreachable for TMA Inst Printer (PR #117850)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-nvptx

Author: Durgadoss R (durga4github)

<details>
<summary>Changes</summary>

This patch adds the llvm_reachable() for TMA
reduction opcode printer method.

We had this inside the default-case leading to
warning below (and hence was removed):
error: default label in switch which covers all enumeration values
       [-Werror,-Wcovered-switch-default]

---
Full diff: https://github.com/llvm/llvm-project/pull/117850.diff


1 Files Affected:

- (modified) llvm/lib/Target/NVPTX/MCTargetDesc/NVPTXInstPrinter.cpp (+2) 


``````````diff
diff --git a/llvm/lib/Target/NVPTX/MCTargetDesc/NVPTXInstPrinter.cpp b/llvm/lib/Target/NVPTX/MCTargetDesc/NVPTXInstPrinter.cpp
index 0f38f644e89af5..65e1893d3f3bdf 100644
--- a/llvm/lib/Target/NVPTX/MCTargetDesc/NVPTXInstPrinter.cpp
+++ b/llvm/lib/Target/NVPTX/MCTargetDesc/NVPTXInstPrinter.cpp
@@ -450,4 +450,6 @@ void NVPTXInstPrinter::printTmaReductionMode(const MCInst *MI, int OpNum,
     O << ".xor";
     return;
   }
+  llvm_unreachable(
+      "Invalid Reduction Op in printCpAsyncBulkTensorReductionMode");
 }

``````````

</details>


https://github.com/llvm/llvm-project/pull/117850