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[AArch64][RegisterBankInfo] Switch to fully static opds mapping for G_BITCAST. 

NFC.

llvm-svn: 284146
This commit is contained in:
Quentin Colombet 2016-10-13 18:46:38 +00:00
parent 44f547aa3f
commit b3f5a8c644
1 changed files with 10 additions and 4 deletions
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14
llvm/lib/Target/AArch64/AArch64RegisterBankInfo.cpp
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@ -477,10 +477,16 @@ AArch64RegisterBankInfo::getInstrMapping(const MachineInstr &MI) const {
case TargetOpcode::G_BITCAST: {
LLT DstTy = MRI.getType(MI.getOperand(0).getReg());
LLT SrcTy = MRI.getType(MI.getOperand(1).getReg());
// If we are on the same bank, we can use the "same kind" mapping.
if (DstTy.isVector() == SrcTy.isVector())
return getSameKindOfOperandsMapping(MI);
break;
unsigned Size = DstTy.getSizeInBits();
bool DstIsGPR = !DstTy.isVector();
bool SrcIsGPR = !SrcTy.isVector();
const RegisterBank &DstRB =
DstIsGPR ? AArch64::GPRRegBank : AArch64::FPRRegBank;
const RegisterBank &SrcRB =
SrcIsGPR ? AArch64::GPRRegBank : AArch64::FPRRegBank;
return InstructionMapping{DefaultMappingID, copyCost(DstRB, SrcRB, Size),
AArch64::getCopyMapping(DstIsGPR, SrcIsGPR, Size),
/*NumOperands*/ 2};
}
default:
break;