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

[Matt Arsenault via llvm-branch-commits]

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@@ -1075,7 +1075,22 @@ void CodeGenPassBuilder<Derived, TargetMachineT>::addTargetRegisterAllocator(
 template <typename Derived, typename TargetMachineT>
 void CodeGenPassBuilder<Derived, TargetMachineT>::addRegAllocPass(
     AddMachinePass &addPass, bool Optimized) const {
-  // TODO: Parse Opt.RegAlloc to add register allocator.
+  // Use the specified -regalloc-npm={basic|greedy|fast|pbqp}
+  if (Opt.RegAlloc > RegAllocType::Default) {
+    switch (Opt.RegAlloc) {
+    case RegAllocType::Fast:
+      addPass(RegAllocFastPass());
+      break;
+    case RegAllocType::Greedy:
+      addPass(RAGreedyPass());
+      break;
+    default:
+      report_fatal_error("Register allocator not supported yet.", false);
----------------
arsenm wrote:

```suggestion
      report_fatal_error("register allocator not supported yet.", false);
```

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