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Move ReplaceUsesOfBlockWith() out of BranchFolding into a MachineBasicBlock general facility.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37408 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2007-06-04 06:44:01 +00:00
parent 26042420d6
commit 0370fad74b
3 changed files with 33 additions and 40 deletions
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27
lib/CodeGen/MachineBasicBlock.cpp
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@ -198,3 +198,30 @@ bool MachineBasicBlock::isSuccessor(MachineBasicBlock *MBB) const {
std::find(Successors.begin(), Successors.end(), MBB);
return I != Successors.end();
}
/// ReplaceUsesOfBlockWith - Given a machine basic block that branched to
/// 'Old', change the code and CFG so that it branches to 'New' instead.
void MachineBasicBlock::ReplaceUsesOfBlockWith(MachineBasicBlock *Old,
MachineBasicBlock *New) {
assert(Old != New && "Cannot replace self with self!");
MachineBasicBlock::iterator I = end();
while (I != begin()) {
--I;
if (!(I->getInstrDescriptor()->Flags & M_TERMINATOR_FLAG)) break;
// Scan the operands of this machine instruction, replacing any uses of Old
// with New.
for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i)
if (I->getOperand(i).isMachineBasicBlock() &&
I->getOperand(i).getMachineBasicBlock() == Old)
I->getOperand(i).setMachineBasicBlock(New);
}
// Update the successor information. If New was already a successor, just
// remove the link to Old instead of creating another one. PR 1444.
removeSuccessor(Old);
if (!isSuccessor(New))
addSuccessor(New);
}