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Do not split edges to EH landing pads. It will cause code size explosion.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66140 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2009-03-05 06:31:26 +00:00
parent 0076c616e8
commit 6fb8f421ee
2 changed files with 40 additions and 0 deletions
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6
lib/Transforms/Scalar/CodeGenPrepare.cpp
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@ -327,6 +327,12 @@ static void SplitEdgeNicely(TerminatorInst *TI, unsigned SuccNum,
assert(isa<PHINode>(Dest->begin()) &&
"This should only be called if Dest has a PHI!");
// Do not split edges to EH landing pads.
if (InvokeInst *Invoke = dyn_cast<InvokeInst>(TI)) {
if (Invoke->getSuccessor(1) == Dest)
return;
}
// As a hack, never split backedges of loops. Even though the copy for any
// PHIs inserted on the backedge would be dead for exits from the loop, we
// assume that the cost of *splitting* the backedge would be too high.