diff --git a/lib/Target/PowerPC/PPCRegisterInfo.cpp b/lib/Target/PowerPC/PPCRegisterInfo.cpp index 2c7752e6dbc..7b9b8e7b611 100644 --- a/lib/Target/PowerPC/PPCRegisterInfo.cpp +++ b/lib/Target/PowerPC/PPCRegisterInfo.cpp @@ -102,7 +102,19 @@ PPCRegisterInfo::storeRegToStackSlot(MachineBasicBlock &MBB, BuildMI(MBB, MI, PPC::MFLR, 1, PPC::R11); addFrameReference(BuildMI(MBB, MI, PPC::STW, 3).addReg(PPC::R11), FrameIdx); } else if (RC == PPC::CRRCRegisterClass) { + // We need to store the CR in the low 4-bits of the saved value. First, + // issue a MFCR to save all of the CRBits. BuildMI(MBB, MI, PPC::MFCR, 0, PPC::R11); + + // If the saved register wasn't CR0, shift the bits left so that they are in + // CR0's slot. + if (SrcReg != PPC::CR0) { + unsigned ShiftBits = PPCRegisterInfo::getRegisterNumbering(SrcReg)*4; + // rlwinm r11, r11, ShiftBits, 0, 31. + BuildMI(MBB, MI, PPC::RLWINM, 4, PPC::R11) + .addReg(PPC::R11).addImm(ShiftBits).addImm(0).addImm(31); + } + addFrameReference(BuildMI(MBB, MI, PPC::STW, 3).addReg(PPC::R11), FrameIdx); } else if (RC == PPC::GPRCRegisterClass) { addFrameReference(BuildMI(MBB, MI, PPC::STW, 3).addReg(SrcReg),FrameIdx); @@ -137,6 +149,16 @@ PPCRegisterInfo::loadRegFromStackSlot(MachineBasicBlock &MBB, BuildMI(MBB, MI, PPC::MTLR, 1).addReg(PPC::R11); } else if (RC == PPC::CRRCRegisterClass) { addFrameReference(BuildMI(MBB, MI, PPC::LWZ, 2, PPC::R11), FrameIdx); + + // If the reloaded register isn't CR0, shift the bits right so that they are + // in the right CR's slot. + if (DestReg != PPC::CR0) { + unsigned ShiftBits = PPCRegisterInfo::getRegisterNumbering(DestReg)*4; + // rlwinm r11, r11, 32-ShiftBits, 0, 31. + BuildMI(MBB, MI, PPC::RLWINM, 4, PPC::R11) + .addReg(PPC::R11).addImm(32-ShiftBits).addImm(0).addImm(31); + } + BuildMI(MBB, MI, PPC::MTCRF, 1, DestReg).addReg(PPC::R11); } else if (RC == PPC::GPRCRegisterClass) { addFrameReference(BuildMI(MBB, MI, PPC::LWZ, 2, DestReg), FrameIdx); @@ -407,8 +429,8 @@ PPCRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II) const { /// VRRegNo - Map from a numbered VR register to its enum value. /// static const unsigned short VRRegNo[] = { - PPC::V0 , PPC::V1 , PPC::V2 , PPC::V3 , PPC::V4 , PPC::V5 , PPC::V6 , PPC::V7 , - PPC::V8 , PPC::V9 , PPC::V10, PPC::V11, PPC::V12, PPC::V13, PPC::V14, PPC::V15, + PPC::V0 , PPC::V1 , PPC::V2 , PPC::V3 , PPC::V4 , PPC::V5 , PPC::V6 , PPC::V7 , + PPC::V8 , PPC::V9 , PPC::V10, PPC::V11, PPC::V12, PPC::V13, PPC::V14, PPC::V15, PPC::V16, PPC::V17, PPC::V18, PPC::V19, PPC::V20, PPC::V21, PPC::V22, PPC::V23, PPC::V24, PPC::V25, PPC::V26, PPC::V27, PPC::V28, PPC::V29, PPC::V30, PPC::V31 };