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The hasConstantReferences predicate always returns false. 

llvm-svn: 11301
This commit is contained in:
Chris Lattner 2004-02-11 01:17:07 +00:00
parent 0606da9572
commit 838b845781
1 changed files with 50 additions and 53 deletions
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11
llvm/lib/Transforms/Utils/SimplifyCFG.cpp
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@ -105,9 +105,9 @@ bool llvm::SimplifyCFG(BasicBlock *BB) {
assert(BB->getTerminator() && "Degenerate basic block encountered!");
assert(&BB->getParent()->front() != BB && "Can't Simplify entry block!");
// Check to see if the first instruction in this block is just an
// 'llvm.unwind'. If so, replace any invoke instructions which use this as an
// exception destination with call instructions.
// Check to see if the first instruction in this block is just an unwind. If
// so, replace any invoke instructions which use this as an exception
// destination with call instructions.
//
if (UnwindInst *UI = dyn_cast<UnwindInst>(BB->getTerminator()))
if (BB->begin() == BasicBlock::iterator(UI)) { // Empty block?
@ -136,8 +136,7 @@ bool llvm::SimplifyCFG(BasicBlock *BB) {
}
// Remove basic blocks that have no predecessors... which are unreachable.
if (pred_begin(BB) == pred_end(BB) &&
!BB->hasConstantReferences()) {
if (pred_begin(BB) == pred_end(BB)) {
//cerr << "Removing BB: \n" << BB;
// Loop through all of our successors and make sure they know that one
@ -237,7 +236,6 @@ bool llvm::SimplifyCFG(BasicBlock *BB) {
// pred, and if there is only one distinct successor of the predecessor, and
// if there are no PHI nodes.
//
if (!BB->hasConstantReferences()) {
pred_iterator PI(pred_begin(BB)), PE(pred_end(BB));
BasicBlock *OnlyPred = *PI++;
for (; PI != PE; ++PI) // Search all predecessors, see if they are all same
@ -295,7 +293,6 @@ bool llvm::SimplifyCFG(BasicBlock *BB) {
return true;
}
}
return Changed;
}