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implement the BlockHasNoFallThrough hook

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31264 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-10-28 17:35:02 +00:00
parent cf420cca57
commit ef13982aa7
2 changed files with 12 additions and 0 deletions
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11
lib/Target/PowerPC/PPCInstrInfo.cpp
View File

@ -259,6 +259,17 @@ void PPCInstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
BuildMI(&MBB, PPC::B, 1).addMBB(FBB);
}
bool PPCInstrInfo::BlockHasNoFallThrough(MachineBasicBlock &MBB) const {
if (MBB.empty()) return false;
switch (MBB.back().getOpcode()) {
case PPC::B: // Uncond branch.
case PPC::BCTR: // Indirect branch.
return true;
default: return false;
}
}
bool PPCInstrInfo::
ReverseBranchCondition(std::vector<MachineOperand> &Cond) const {
assert(Cond.size() == 2 && "Invalid PPC branch opcode!");

1
lib/Target/PowerPC/PPCInstrInfo.h
View File

@ -110,6 +110,7 @@ public:
virtual void InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
MachineBasicBlock *FBB,
const std::vector<MachineOperand> &Cond) const;
virtual bool BlockHasNoFallThrough(MachineBasicBlock &MBB) const;
virtual bool ReverseBranchCondition(std::vector<MachineOperand> &Cond) const;