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Inliner: Non-local functions in COMDATs shouldn't be dropped

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A function with discardable linkage cannot be discarded if its a member
of a COMDAT group without considering all the other COMDAT members as
well.  This sort of thing is already handled by GlobalOpt/GlobalDCE.

This fixes PR21206.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219335 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Majnemer
2014-10-08 19:32:32 +00:00
parent 0a5843e3b1
commit b5b306e6a9
2 changed files with 25 additions and 0 deletions
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7
lib/Transforms/IPO/Inliner.cpp
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@ -669,6 +669,13 @@ bool Inliner::removeDeadFunctions(CallGraph &CG, bool AlwaysInlineOnly) {
if (!F->isDefTriviallyDead())
continue;
// It is unsafe to drop a function with discardable linkage from a COMDAT
// without also dropping the other members of the COMDAT.
// The inliner doesn't visit non-function entities which are in COMDAT
// groups so it is unsafe to do so *unless* the linkage is local.
if (!F->hasLocalLinkage() && F->hasComdat())
continue;
// Remove any call graph edges from the function to its callees.
CGN->removeAllCalledFunctions();