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Partial revert of 132882.
Dan noted that this would work on the case shown on the commit message. I think the case that was failing was a bb ending with a redundant conditional jump: ... jne foo foo: ... I was unable to find any such case in the tests or in a debug build of clang, so I will revert this part of the patch and watch the bots. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133004 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1925,7 +1925,7 @@ isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const {
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return false;
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// The predecessor has to be immediately before this block.
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MachineBasicBlock *Pred = *PI;
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const MachineBasicBlock *Pred = *PI;
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if (!Pred->isLayoutSuccessor(MBB))
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return false;
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@ -1934,26 +1934,9 @@ isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const {
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if (Pred->empty())
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return true;
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// Check the terminators in the previous blocks
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for (MachineBasicBlock::iterator II = Pred->getFirstTerminator(),
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IE = Pred->end(); II != IE; ++II) {
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MachineInstr &MI = *II;
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// If it is not a simple branch, we are in a table somewhere.
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if (!MI.getDesc().isBranch() || MI.getDesc().isIndirectBranch())
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return false;
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// If we are the operands of one of the branches, this is not
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// a fall through.
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for (MachineInstr::mop_iterator OI = MI.operands_begin(),
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OE = MI.operands_end(); OI != OE; ++OI) {
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const MachineOperand& OP = *OI;
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if (OP.isMBB() && OP.getMBB() == MBB)
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return false;
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}
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}
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return true;
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// Otherwise, check the last instruction.
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const MachineInstr &LastInst = Pred->back();
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return !LastInst.getDesc().isBarrier();
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}
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