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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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lib/Transforms/IPO/Inliner.cpp
+1 -4
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@@ -533,10 +533,7 @@ bool Inliner::removeDeadFunctions(CallGraph &CG,
if (DNR && DNR->count(F))
continue;
if (!F->hasLinkOnceLinkage() && !F->hasLocalLinkage() &&
!F->hasAvailableExternallyLinkage())
continue;
if (!F->use_empty())
if (!F->isDefTriviallyDead())
continue;
// Remove any call graph edges from the function to its callees.