[clang] [llvm] [OpenMP] Ensure the actual kernel is annotated with launch bounds (PR #99927)

[Johannes Doerfert via llvm-commits]

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@@ -4569,7 +4569,17 @@ OpenMPIRBuilder::createTargetInit(const LocationDescription &Loc, bool IsSPMD,
   Constant *MayUseNestedParallelismVal = ConstantInt::getSigned(Int8, true);
   Constant *DebugIndentionLevelVal = ConstantInt::getSigned(Int16, 0);
 
-  Function *Kernel = Builder.GetInsertBlock()->getParent();
+  Function *DebugKernelWrapper = Builder.GetInsertBlock()->getParent();
+  Function *Kernel = DebugKernelWrapper;
+
+  // We need to strip the debug prefix to get the correct kernel name.
+  StringRef KernelName = Kernel->getName();
+  const std::string DebugPrefix = "_debug__";
+  if (KernelName.ends_with(DebugPrefix)) {
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jdoerfert wrote:

It's tricky. Honestly, I don't think the wrapper is a great idea, but I want us to not miss out on the performance for debug builds in the next release.

https://github.com/llvm/llvm-project/pull/99927