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Fix PR116

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10032 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-11-16 21:39:27 +00:00
parent d39dbcc743
commit faa45ce300
1 changed files with 12 additions and 0 deletions
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12
lib/Transforms/Scalar/ADCE.cpp
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@ -209,6 +209,18 @@ bool ADCE::doADCE() {
return MadeChanges; return MadeChanges;
} }
// Scan the function marking blocks without post-dominance information as
// live. Blocks without post-dominance information occur when there is an
// infinite loop in the program. Because the infinite loop could contain a
// function which unwinds, exits or has side-effects, we don't want to delete
// the infinite loop or those blocks leading up to it.
for (Function::iterator I = Func->begin(), E = Func->end(); I != E; ++I)
if (DT[I] == 0)
for (pred_iterator PI = pred_begin(I), E = pred_end(I); PI != E; ++PI)
markInstructionLive((*PI)->getTerminator());
DEBUG(std::cerr << "Processing work list\n"); DEBUG(std::cerr << "Processing work list\n");
// AliveBlocks - Set of basic blocks that we know have instructions that are // AliveBlocks - Set of basic blocks that we know have instructions that are