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Simple branch instruction support. 

llvm-svn: 112923
This commit is contained in:
Eric Christopher 2010-09-03 00:35:47 +00:00
parent be13194655
commit 6aaed72949
1 changed files with 23 additions and 0 deletions
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23
llvm/lib/Target/ARM/ARMFastISel.cpp
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@ -112,6 +112,7 @@ class ARMFastISel : public FastISel {
// Instruction selection routines.
virtual bool ARMSelectLoad(const Instruction *I);
virtual bool ARMSelectStore(const Instruction *I);
virtual bool ARMSelectBranch(const Instruction *I);
// Utility routines.
private:
@ -619,6 +620,26 @@ bool ARMFastISel::ARMSelectLoad(const Instruction *I) {
return true;
}
bool ARMFastISel::ARMSelectBranch(const Instruction *I) {
const BranchInst *BI = cast<BranchInst>(I);
MachineBasicBlock *TBB = FuncInfo.MBBMap[BI->getSuccessor(0)];
MachineBasicBlock *FBB = FuncInfo.MBBMap[BI->getSuccessor(1)];
// Simple branch support.
unsigned CondReg = getRegForValue(BI->getCondition());
if (CondReg == 0) return false;
unsigned CmpOpc = isThumb ? ARM::t2CMPrr : ARM::CMPrr;
unsigned BrOpc = isThumb ? ARM::t2Bcc : ARM::Bcc;
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(CmpOpc))
.addReg(CondReg).addReg(CondReg));
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(BrOpc))
.addMBB(TBB).addImm(ARMCC::NE).addReg(ARM::CPSR);
FastEmitBranch(FBB, DL);
FuncInfo.MBB->addSuccessor(TBB);
return true;
}
// TODO: SoftFP support.
bool ARMFastISel::TargetSelectInstruction(const Instruction *I) {
// No Thumb-1 for now.
@ -629,6 +650,8 @@ bool ARMFastISel::TargetSelectInstruction(const Instruction *I) {
return ARMSelectLoad(I);
case Instruction::Store:
return ARMSelectStore(I);
case Instruction::Br:
return ARMSelectBranch(I);
default: break;
}
return false;