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Allow tail duplication in more cases, relaxing the previous restriction a

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bit.  This fixes Regression/Transforms/TailDup/MergeTest.ll

llvm-svn: 30237
This commit is contained in:
Chris Lattner 2006-09-10 18:17:58 +00:00
parent 480465a171
commit 2921612126
1 changed files with 12 additions and 1 deletions
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13
lib/Transforms/Scalar/TailDuplication.cpp
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@ -144,7 +144,18 @@ bool TailDup::shouldEliminateUnconditionalBranch(TerminatorInst *TI) {
// if (b)
// foo();
// Cloning the 'if b' block into the end of the first foo block is messy.
return false;
// The messy case is when the fall-through block falls through to other
// blocks. This is what we would be preventing if we cloned the block.
DestI = Dest;
if (++DestI != Dest->getParent()->end()) {
BasicBlock *DestSucc = DestI;
// If any of Dest's successors are fall-throughs, don't do this xform.
for (succ_iterator SI = succ_begin(Dest), SE = succ_end(Dest);
SI != SE; ++SI)
if (*SI == DestSucc)
return false;
}
}
return true;