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[fast-isel] ARMEmitCmp generates FMSTAT, which transfers the floating-point

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condition flags to CPSR.  This allows us to simplify SelectCmp.
Patch by Zonr Chang <zonr.xchg@gmail.com>.

llvm-svn: 152243
This commit is contained in:
Chad Rosier 2012-03-07 20:59:26 +00:00
parent 4cd149ab38
commit 07b6e758e1
1 changed files with 2 additions and 4 deletions
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6
lib/Target/ARM/ARMFastISel.cpp
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@ -1475,7 +1475,6 @@ bool ARMFastISel::ARMEmitCmp(const Value *Src1Value, const Value *Src2Value,
bool ARMFastISel::SelectCmp(const Instruction *I) {
const CmpInst *CI = cast<CmpInst>(I);
Type *Ty = CI->getOperand(0)->getType();
// Get the compare predicate.
ARMCC::CondCodes ARMPred = getComparePred(CI->getPredicate());
@ -1495,11 +1494,10 @@ bool ARMFastISel::SelectCmp(const Instruction *I) {
unsigned DestReg = createResultReg(RC);
Constant *Zero = ConstantInt::get(Type::getInt32Ty(*Context), 0);
unsigned ZeroReg = TargetMaterializeConstant(Zero);
bool isFloat = (Ty->isFloatTy() || Ty->isDoubleTy());
unsigned CondReg = isFloat ? ARM::FPSCR_NZCV : ARM::CPSR;
// ARMEmitCmp emits a FMSTAT when necessary, so it's always safe to use CPSR.
BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(MovCCOpc), DestReg)
.addReg(ZeroReg).addImm(1)
.addImm(ARMPred).addReg(CondReg);
.addImm(ARMPred).addReg(ARM::CPSR);
UpdateValueMap(I, DestReg);
return true;