diff options
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Target/PowerPC/PPCInstrInfo.cpp | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp b/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp index 72c7118fcf8..6b5d78b5814 100644 --- a/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp +++ b/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp @@ -710,12 +710,14 @@ void PPCInstrInfo::copyPhysReg(MachineBasicBlock &MBB, else if (PPC::VRRCRegClass.contains(DestReg, SrcReg)) Opc = PPC::VOR; else if (PPC::VSRCRegClass.contains(DestReg, SrcReg)) - // FIXME: There are really two different ways this can be done, and we - // should pick the better one depending on the situation: + // There are two different ways this can be done: // 1. xxlor : This has lower latency (on the P7), 2 cycles, but can only // issue in VSU pipeline 0. // 2. xmovdp/xmovsp: This has higher latency (on the P7), 6 cycles, but // can go to either pipeline. + // We'll always use xxlor here, because in practically all cases where + // copies are generated, they are close enough to some use that the + // lower-latency form is preferable. Opc = PPC::XXLOR; else if (PPC::CRBITRCRegClass.contains(DestReg, SrcReg)) Opc = PPC::CROR; |
