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[PowerPC] Handle selection of compare instructions in fast-isel.

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Mostly trivial patch adding support for compares.  The meat of the
work was added with the branch support.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189639 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Schmidt
2013-08-30 03:16:48 +00:00
parent 40433e5df9
commit e206efd39b
2 changed files with 307 additions and 0 deletions
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18
lib/Target/PowerPC/PPCFastISel.cpp
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@ -108,6 +108,7 @@ class PPCFastISel : public FastISel {
bool SelectStore(const Instruction *I);
bool SelectBranch(const Instruction *I);
bool SelectIndirectBr(const Instruction *I);
bool SelectCmp(const Instruction *I);
bool SelectBinaryIntOp(const Instruction *I, unsigned ISDOpcode);
bool SelectRet(const Instruction *I);
bool SelectIntExt(const Instruction *I);
@ -1065,6 +1066,23 @@ bool PPCFastISel::SelectIndirectBr(const Instruction *I) {
return true;
}
// Attempt to fast-select a compare instruction.
bool PPCFastISel::SelectCmp(const Instruction *I) {
const CmpInst *CI = cast<CmpInst>(I);
Optional<PPC::Predicate> OptPPCPred = getComparePred(CI->getPredicate());
if (!OptPPCPred)
return false;
unsigned CondReg = createResultReg(&PPC::CRRCRegClass);
if (!PPCEmitCmp(CI->getOperand(0), CI->getOperand(1), CI->isUnsigned(),
CondReg))
return false;
UpdateValueMap(I, CondReg);
return true;
}
// Attempt to fast-select an integer extend instruction.
bool PPCFastISel::SelectIntExt(const Instruction *I) {
Type *DestTy = I->getType();