================
@@ -2478,3 +2479,76 @@ PreservedAnalyses LowerTypeTestsPass::run(Module &M,
return PreservedAnalyses::all();
return PreservedAnalyses::none();
}
+
+PreservedAnalyses SimplifyTypeTestsPass::run(Module &M,
+ ModuleAnalysisManager &AM) {
+ bool Changed = false;
+ // Figure out whether inlining has exposed a constant address to a lowered
+ // type test, and remove the test if so and the address is known to pass the
+ // test. Unfortunately this pass ends up needing to reverse engineer what
+ // LowerTypeTests did; this is currently inherent to the design of ThinLTO
+ // importing where LowerTypeTests needs to run at the start.
+ for (auto &GV : M.globals()) {
+ if (!GV.getName().starts_with("__typeid_") ||
+ !GV.getName().ends_with("_global_addr"))
+ continue;
+ auto *MD = MDString::get(M.getContext(),
+ GV.getName().substr(9, GV.getName().size() - 21));
+ auto MaySimplifyPtr = [&](Value *Ptr) {
+ if (auto *GV = dyn_cast<GlobalValue>(Ptr))
+ if (auto *CFIGV = M.getNamedValue((GV->getName() + ".cfi").str()))
+ Ptr = CFIGV;
+ return isKnownTypeIdMember(MD, M.getDataLayout(), Ptr, 0);
----------------
teresajohnson wrote:
Are there cases where the GV will not have a ".cfi" extension? I notice the
test has that extension.
https://github.com/llvm/llvm-project/pull/141327
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