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Expand bitcast support in fast isel to support bitcasts of non-constant values by emitting reg-reg copies.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55340 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2008-08-25 21:32:34 +00:00
parent ab6c3bb44d
commit d894f1d274
1 changed files with 29 additions and 1 deletions
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30
lib/CodeGen/SelectionDAG/FastISel.cpp
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@ -234,8 +234,36 @@ FastISel::SelectInstructions(BasicBlock::iterator Begin,
} else
// TODO: Support vector and fp constants.
return I;
} else if (!isa<Constant>(I->getOperand(0))) {
// Bitcasts of non-constant values become reg-reg copies.
MVT SrcVT = MVT::getMVT(I->getOperand(0)->getType());
MVT DstVT = MVT::getMVT(I->getOperand(0)->getType());
if (SrcVT == MVT::Other || !SrcVT.isSimple() ||
DstVT == MVT::Other || !DstVT.isSimple() ||
!TLI.isTypeLegal(SrcVT) || !TLI.isTypeLegal(DstVT))
// Unhandled type. Halt "fast" selection and bail.
return I;
if (!TLI.isConvertLegal(SrcVT, DstVT))
// Illegal conversion. Halt "fast" selection and bail.
return I:
// Otherwise, insert a register-to-register copy.
TargetRegisterClass* SrcClass = TLI.getRegClassFor(SrcVT);
TargetRegisterClass* DstClass = TLI.getRegClassFor(DstVT);
unsigned Op0 = ValueMap[I->getOperand(0)];
unsigned ResultReg = createResultReg(DstClass);
if (Op0 == 0)
// Unhandled operand. Halt "fast" selection and bail.
return false;
TII.copyRegToReg(*MBB, MBB->end(), ResultReg, Op0, DstClass, SrcClass);
ValueMap[I] = ResultReg;
break;
} else
// TODO: Support non-constant bitcasts.
// Casting a non-integral constant?
return I;
default: