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| author | Chris Lattner <sabre@nondot.org> | 2004-12-11 05:32:19 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2004-12-11 05:32:19 +0000 |
| commit | 8525ebe4658302ee90c12fefb6c73b9a0c6f4315 (patch) | |
| tree | 77ca33b1e54f20cacf64146e8730a9ee7af1a8a0 /llvm/lib/Transforms | |
| parent | b3095dd88fca220bcda1d213cdd64e392945c834 (diff) | |
| download | bcm5719-llvm-8525ebe4658302ee90c12fefb6c73b9a0c6f4315.tar.gz bcm5719-llvm-8525ebe4658302ee90c12fefb6c73b9a0c6f4315.zip | |
Do not delete the entry block to a function.
llvm-svn: 18795
Diffstat (limited to 'llvm/lib/Transforms')
| -rw-r--r-- | llvm/lib/Transforms/Scalar/SCCP.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/llvm/lib/Transforms/Scalar/SCCP.cpp b/llvm/lib/Transforms/Scalar/SCCP.cpp index 9a8d26bb7b8..7682e5a9e18 100644 --- a/llvm/lib/Transforms/Scalar/SCCP.cpp +++ b/llvm/lib/Transforms/Scalar/SCCP.cpp @@ -1178,7 +1178,6 @@ bool IPSCCP::runOnModule(Module &M) { if (!ExecutableBBs.count(BB)) { DEBUG(std::cerr << " BasicBlock Dead:" << *BB); ++IPNumDeadBlocks; - BlocksToErase.push_back(BB); // Delete the instructions backwards, as it has a reduced likelihood of // having to update as many def-use and use-def chains. @@ -1206,6 +1205,11 @@ bool IPSCCP::runOnModule(Module &M) { TI->replaceAllUsesWith(UndefValue::get(TI->getType())); BB->getInstList().erase(TI); + if (&*BB != &F->front()) + BlocksToErase.push_back(BB); + else + new UnreachableInst(BB); + } else { for (BasicBlock::iterator BI = BB->begin(), E = BB->end(); BI != E; ) { Instruction *Inst = BI++; |
