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Very basic compare support.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113440 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Christopher 2010-09-08 23:13:45 +00:00
parent 4975447d94
commit d43393ae34
1 changed files with 48 additions and 0 deletions
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48
lib/Target/ARM/ARMFastISel.cpp
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@ -113,6 +113,7 @@ class ARMFastISel : public FastISel {
virtual bool ARMSelectLoad(const Instruction *I); virtual bool ARMSelectLoad(const Instruction *I);
virtual bool ARMSelectStore(const Instruction *I); virtual bool ARMSelectStore(const Instruction *I);
virtual bool ARMSelectBranch(const Instruction *I); virtual bool ARMSelectBranch(const Instruction *I);
virtual bool ARMSelectCmp(const Instruction *I);
// Utility routines. // Utility routines.
private: private:
@ -650,6 +651,50 @@ bool ARMFastISel::ARMSelectBranch(const Instruction *I) {
return true; return true;
} }
bool ARMFastISel::ARMSelectCmp(const Instruction *I) {
const CmpInst *CI = cast<CmpInst>(I);
EVT VT;
const Type *Ty = CI->getOperand(0)->getType();
if (!isTypeLegal(Ty, VT))
return false;
bool isFloat = (Ty->isDoubleTy() || Ty->isFloatTy());
if (isFloat && !Subtarget->hasVFP2())
return false;
unsigned CmpOpc;
switch (VT.getSimpleVT().SimpleTy) {
default: return false;
// TODO: Verify compares.
case MVT::f32:
CmpOpc = ARM::VCMPES;
break;
case MVT::f64:
CmpOpc = ARM::VCMPED;
break;
case MVT::i32:
CmpOpc = isThumb ? ARM::t2CMPrr : ARM::CMPrr;
break;
}
unsigned Arg1 = getRegForValue(CI->getOperand(0));
if (Arg1 == 0) return false;
unsigned Arg2 = getRegForValue(CI->getOperand(1));
if (Arg2 == 0) return false;
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(CmpOpc))
.addReg(Arg1).addReg(Arg2));
// For floating point we need to move the result to a register we can
// actually do something with.
if (isFloat)
AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(ARM::FMSTAT)));
return true;
}
// TODO: SoftFP support. // TODO: SoftFP support.
bool ARMFastISel::TargetSelectInstruction(const Instruction *I) { bool ARMFastISel::TargetSelectInstruction(const Instruction *I) {
// No Thumb-1 for now. // No Thumb-1 for now.
@ -662,6 +707,9 @@ bool ARMFastISel::TargetSelectInstruction(const Instruction *I) {
return ARMSelectStore(I); return ARMSelectStore(I);
case Instruction::Br: case Instruction::Br:
return ARMSelectBranch(I); return ARMSelectBranch(I);
case Instruction::ICmp:
case Instruction::FCmp:
return ARMSelectCmp(I);
default: break; default: break;
} }
return false; return false;