[llvm-branch-commits] [clang] [llvm] [InstCombiner] Remove unused `llvm.experimental.hot()` (PR #84851)

[Nikita Popov via llvm-branch-commits]

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@@ -2827,6 +2827,14 @@ Instruction *InstCombinerImpl::visitCallInst(CallInst &CI) {
         }))
       return nullptr;
     break;
+  case Intrinsic::experimental_hot: {
+    // The intrinsic declaration includes sideeffects to avoid it moved. This
+    // prevents removing even if the intrinsic is unused. We should remove
+    // unused ones to enabled other optimizations.
+    if (CI.use_empty())
+      return eraseInstFromFunction(CI);
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nikic wrote:

This should be handled inside wouldInstructionBeTriviallyDead.

https://github.com/llvm/llvm-project/pull/84851