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Do not delete the entry block to a function.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18795 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-12-11 05:32:19 +00:00
parent 56c5d7369b
commit 864737bf9e
1 changed files with 5 additions and 1 deletions
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6
lib/Transforms/Scalar/SCCP.cpp
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@ -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++;