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Teaching MBlaze backend how to reverse branch conditions.

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llvm-svn: 120707
This commit is contained in:
Wesley Peck 2010-12-02 16:17:11 +00:00
parent f8cc69a131
commit 09a4bffe09
2 changed files with 35 additions and 0 deletions
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30
lib/Target/MBlaze/MBlazeInstrInfo.cpp
View File

@ -234,6 +234,36 @@ unsigned MBlazeInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
return 2;
}
bool MBlazeInstrInfo::ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const {
assert(Cond.size() == 2 && "Invalid MBlaze branch opcode!");
switch (Cond[0].getImm()) {
default: return true;
case MBlaze::BEQ: Cond[0].setImm(MBlaze::BNE); return false;
case MBlaze::BNE: Cond[0].setImm(MBlaze::BEQ); return false;
case MBlaze::BGT: Cond[0].setImm(MBlaze::BLE); return false;
case MBlaze::BGE: Cond[0].setImm(MBlaze::BLT); return false;
case MBlaze::BLT: Cond[0].setImm(MBlaze::BGE); return false;
case MBlaze::BLE: Cond[0].setImm(MBlaze::BGT); return false;
case MBlaze::BEQI: Cond[0].setImm(MBlaze::BNEI); return false;
case MBlaze::BNEI: Cond[0].setImm(MBlaze::BEQI); return false;
case MBlaze::BGTI: Cond[0].setImm(MBlaze::BLEI); return false;
case MBlaze::BGEI: Cond[0].setImm(MBlaze::BLTI); return false;
case MBlaze::BLTI: Cond[0].setImm(MBlaze::BGEI); return false;
case MBlaze::BLEI: Cond[0].setImm(MBlaze::BGTI); return false;
case MBlaze::BEQD: Cond[0].setImm(MBlaze::BNED); return false;
case MBlaze::BNED: Cond[0].setImm(MBlaze::BEQD); return false;
case MBlaze::BGTD: Cond[0].setImm(MBlaze::BLED); return false;
case MBlaze::BGED: Cond[0].setImm(MBlaze::BLTD); return false;
case MBlaze::BLTD: Cond[0].setImm(MBlaze::BGED); return false;
case MBlaze::BLED: Cond[0].setImm(MBlaze::BGTD); return false;
case MBlaze::BEQID: Cond[0].setImm(MBlaze::BNEID); return false;
case MBlaze::BNEID: Cond[0].setImm(MBlaze::BEQID); return false;
case MBlaze::BGTID: Cond[0].setImm(MBlaze::BLEID); return false;
case MBlaze::BGEID: Cond[0].setImm(MBlaze::BLTID); return false;
case MBlaze::BLTID: Cond[0].setImm(MBlaze::BGEID); return false;
case MBlaze::BLEID: Cond[0].setImm(MBlaze::BGTID); return false;
}
}
/// getGlobalBaseReg - Return a virtual register initialized with the
/// the global base register value. Output instructions required to

5
lib/Target/MBlaze/MBlazeInstrInfo.h
View File

@ -257,6 +257,11 @@ public:
const SmallVectorImpl<MachineOperand> &Cond,
DebugLoc DL) const;
virtual unsigned RemoveBranch(MachineBasicBlock &MBB) const;
virtual bool ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond)
const;
virtual void copyPhysReg(MachineBasicBlock &MBB,
MachineBasicBlock::iterator I, DebugLoc DL,
unsigned DestReg, unsigned SrcReg,