[llvm-branch-commits] [llvm] [RegAlloc][NewPM] Plug Greedy RA in codegen pipeline (PR #120557)

[Matt Arsenault via llvm-branch-commits]

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@@ -2099,6 +2100,28 @@ void AMDGPUCodeGenPassBuilder::addMachineSSAOptimization(
   addPass(SIShrinkInstructionsPass());
 }
 
+static const char RegAllocNPMNotSupportedMessage[] =
+    "-regalloc-npm not supported with amdgcn. Use -sgpr-regalloc-npm, "
+    "-wwm-regalloc-npm, and -vgpr-regalloc-npm";
+
+Error AMDGPUCodeGenPassBuilder::addRegAssignmentOptimized(
+    AddMachinePass &addPass) const {
+  if (Opt.RegAlloc != RegAllocType::Unset)
+    report_fatal_error(RegAllocNPMNotSupportedMessage, false);
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arsenm wrote:

Why mix fatal errors and returned errors? 

https://github.com/llvm/llvm-project/pull/120557