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Refactor code from inlining and globalopt that checks whether a function definition is unused, and enhance it so it can tell that functions which are only used by a blockaddress are in fact dead. This probably doesn't happen much on most code, but the Linux kernel's _THIS_IP_ can trigger this issue with blockaddress. (GlobalDCE can also handle the given tescase, but we only run that at -O3.) Found while looking at PR11180.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142572 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman
2011-10-20 05:23:42 +00:00
parent d7e5264b46
commit c66330504c
6 changed files with 52 additions and 7 deletions
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2
lib/Transforms/IPO/GlobalOpt.cpp
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@@ -1890,7 +1890,7 @@ bool GlobalOpt::OptimizeFunctions(Module &M) {
if (!F->hasName() && !F->isDeclaration())
F->setLinkage(GlobalValue::InternalLinkage);
F->removeDeadConstantUsers();
if (F->use_empty() && (F->hasLocalLinkage() || F->hasLinkOnceLinkage())) {
if (F->isDefTriviallyDead()) {
F->eraseFromParent();
Changed = true;
++NumFnDeleted;