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Fix up PHI nodes correctly in the presence of unreachable BBs, part two. Also
delete a newed pointer, and improve readability a little bit. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79411 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -226,10 +226,9 @@ void SSI::rename(BasicBlock *BB) {
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for (BasicBlock::iterator begin = BB_succ->begin(),
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notPhi = BB_succ->getFirstNonPHI(); begin != *notPhi; ++begin) {
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Instruction *I = begin;
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PHINode *PN;
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PHINode *PN = dyn_cast<PHINode>(I);
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int position;
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if ((PN = dyn_cast<PHINode>(I)) && ((position
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= getPositionPhi(PN)) != -1)) {
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if (PN && ((position = getPositionPhi(PN)) != -1)) {
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PN->addIncoming(value_stack[position].back(), BB);
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}
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}
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@ -254,6 +253,8 @@ void SSI::rename(BasicBlock *BB) {
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}
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}
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}
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delete defined;
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}
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/// Substitute any use in this instruction for the last definition of
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@ -307,16 +308,16 @@ bool SSI::dominateAny(BasicBlock *BB, Instruction *value) {
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/// as an operand of another phi function used in the same BasicBlock,
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/// LLVM looks this as an error. So on the second phi, the first phi is called
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/// P and the BasicBlock it incomes is B. This P will be replaced by the value
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/// it has for BasicBlock B.
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/// it has for BasicBlock B. It also includes undef values for predecessors
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/// that were not included in the phi.
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///
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void SSI::fixPhis() {
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for (SmallPtrSet<PHINode *, 1>::iterator begin = phisToFix.begin(),
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end = phisToFix.end(); begin != end; ++begin) {
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PHINode *PN = *begin;
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for (unsigned i = 0, e = PN->getNumIncomingValues(); i < e; ++i) {
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PHINode *PN_father;
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if ((PN_father = dyn_cast<PHINode>(PN->getIncomingValue(i))) &&
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PN->getParent() == PN_father->getParent() &&
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PHINode *PN_father = dyn_cast<PHINode>(PN->getIncomingValue(i));
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if (PN_father && PN->getParent() == PN_father->getParent() &&
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!DT_->dominates(PN->getParent(), PN->getIncomingBlock(i))) {
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BasicBlock *BB = PN->getIncomingBlock(i);
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int pos = PN_father->getBasicBlockIndex(BB);
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@ -324,6 +325,28 @@ void SSI::fixPhis() {
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}
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}
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}
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for (DenseMapIterator<PHINode *, unsigned> begin = phis.begin(),
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end = phis.end(); begin != end; ++begin) {
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PHINode *PN = begin->first;
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BasicBlock *BB = PN->getParent();
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pred_iterator PI = pred_begin(BB), PE = pred_end(BB);
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SmallVector<BasicBlock*, 8> Preds(PI, PE);
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for (unsigned size = Preds.size();
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PI != PE && PN->getNumIncomingValues() != size; ++PI) {
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bool found = false;
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for (unsigned i = 0, pn_end = PN->getNumIncomingValues();
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i < pn_end; ++i) {
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if (PN->getIncomingBlock(i) == *PI) {
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found = true;
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break;
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}
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}
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if (!found) {
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PN->addIncoming(UndefValue::get(PN->getType()), *PI);
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}
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}
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}
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}
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/// Return which variable (position on the vector of variables) this phi
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22
test/Transforms/SSI/2009-08-19-UnreachableBB2.ll
Normal file
22
test/Transforms/SSI/2009-08-19-UnreachableBB2.ll
Normal file
@ -0,0 +1,22 @@
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; RUN: llvm-as < %s | opt -ssi-everything -disable-output
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define void @foo() {
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entry:
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%tmp0 = load i64* undef, align 4 ; <i64> [#uses=3]
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br i1 undef, label %end_stmt_playback, label %bb16
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readJournalHdr.exit: ; No predecessors!
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br label %end_stmt_playback
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bb16: ; preds = %bb7
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%tmp1 = icmp slt i64 0, %tmp0 ; <i1> [#uses=1]
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br i1 %tmp1, label %bb16, label %bb17
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bb17: ; preds = %bb16
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store i64 %tmp0, i64* undef, align 4
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br label %end_stmt_playback
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end_stmt_playback: ; preds = %bb17, %readJournalHdr.exit, %bb6, %bb2
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store i64 %tmp0, i64* undef, align 4
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ret void
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}
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