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add a comment about why we don't allow inlining indbr.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85724 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-11-01 18:16:30 +00:00
parent 1107f03ef4
commit 66588707ac
1 changed files with 5 additions and 0 deletions
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5
lib/Analysis/InlineCost.cpp
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@ -159,6 +159,11 @@ void CodeMetrics::analyzeBasicBlock(const BasicBlock *BB) {
if (isa<ReturnInst>(BB->getTerminator()))
++NumRets;
// We never want to inline functions that contain an indirectbr. This is
// incorrect because all the blockaddress's (e.g. in static global
// initializers would be referring to the original function, and this indirect
// jump would jump from the inlined copy of the function into the original
// function which is extremely undefined behavior.
if (isa<IndirectBrInst>(BB->getTerminator()))
NeverInline = true;
}