[NFC][PowerPC]Assert when trying to generate directmove below P8.

This was found when we generated COPY from G8RC to F8RC in
EmitInstrWithCustomInserter without checking proper architecture,
we silently generated mtvsrd, which require P8 and up.

This is a NFC patch to add assert when we call copyPhysReg, in case
someone accidentally generate COPY between G8RC to F8RC for P7 and
below.

llvm-svn: 355920

1 files changed, 4 insertions, 1 deletions

diff --git a/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp b/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
index 936cbcc4c30..2514e5b87a7 100644
--- a/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
+++ b/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
@@ -941,12 +941,16 @@ void PPCInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
     return;
   } else if (PPC::G8RCRegClass.contains(SrcReg) &&
              PPC::VSFRCRegClass.contains(DestReg)) {
+    assert(Subtarget.hasDirectMove() &&
+           "Subtarget doesn't support directmove, don't know how to copy.");
     BuildMI(MBB, I, DL, get(PPC::MTVSRD), DestReg).addReg(SrcReg);
     NumGPRtoVSRSpill++;
     getKillRegState(KillSrc);
     return;
   } else if (PPC::VSFRCRegClass.contains(SrcReg) &&
              PPC::G8RCRegClass.contains(DestReg)) {
+    assert(Subtarget.hasDirectMove() &&
+           "Subtarget doesn't support directmove, don't know how to copy.");
     BuildMI(MBB, I, DL, get(PPC::MFVSRD), DestReg).addReg(SrcReg);
     getKillRegState(KillSrc);
     return;
@@ -962,7 +966,6 @@ void PPCInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
     return;
   }
 
-
   unsigned Opc;
   if (PPC::GPRCRegClass.contains(DestReg, SrcReg))
     Opc = PPC::OR;