[llvm-branch-commits] [WebAssembly] Port WebAssemblyRegColoringPass (PR #210225)

[Aiden Grossman via llvm-branch-commits]

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@@ -329,3 +329,27 @@ bool WebAssemblyRegColoring::runOnMachineFunction(MachineFunction &MF) {
   }
   return true;
 }
+
+bool WebAssemblyRegColoringLegacy::runOnMachineFunction(MachineFunction &MF) {
+  LiveIntervals *Liveness = &getAnalysis<LiveIntervalsWrapperPass>().getLIS();
+  const MachineBlockFrequencyInfo *MBFI =
+      &getAnalysis<MachineBlockFrequencyInfoWrapperPass>().getMBFI();
+  return regColoring(MF, Liveness, MBFI);
+}
+
+PreservedAnalyses
+WebAssemblyRegColoringPass::run(MachineFunction &MF,
+                                MachineFunctionAnalysisManager &MFAM) {
+  // TODO(boomanaiden154): We duplicate this check from above to avoid computing
+  // analyses if we do not need to. We should remove it when remove support for
+  // the LegacyPM and are able to simplify things.
+  if (MF.exposesReturnsTwice())
+    return PreservedAnalyses::all();
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boomanaiden154 wrote:

It costs us compile time because we might be computing non-cached analyses when we don't need to, which I'd rather avoid if possible.

https://github.com/llvm/llvm-project/pull/210225