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Fix bug: test/Regression/Transforms/SCCP/2002-05-20-MissedIncomingValue.ll

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That was causing a miscompilation of strtol/atoi plus others


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2669 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2002-05-20 20:48:03 +00:00
parent a7cc6dd494
commit 618b4a11bb
1 changed files with 11 additions and 1 deletions
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12
lib/Transforms/Scalar/SCCP.cpp
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@ -176,6 +176,16 @@ private:
DEBUG_SCCP(cerr << "Marking BB Executable: " << BB);
BBExecutable.insert(BB); // Basic block is executable!
BBWorkList.push_back(BB); // Add the block to the work list!
// Visit all of the PHI nodes that merge values from this block... Because
// this block is newly executable, PHI nodes that used to be constant now
// may not be. Note that we only mark PHI nodes that live in blocks that
// can execute!
//
for (Value::use_iterator I = BB->use_begin(), E = BB->use_end(); I != E;++I)
if (PHINode *PN = dyn_cast<PHINode>(*I))
if (BBExecutable.count(PN->getParent()))
visitPHINode(PN);
}
@ -308,7 +318,7 @@ bool SCCP::runOnFunction(Function *F) {
InstVal &IV = ValueState[Inst];
if (IV.isConstant()) {
Constant *Const = IV.getConstant();
DEBUG_SCCP(cerr << "Constant: " << Inst << " is: " << Const);
DEBUG_SCCP(cerr << "Constant: " << Const << " = " << Inst);
// Replaces all of the uses of a variable with uses of the constant.
Inst->replaceAllUsesWith(Const);