Add VSX Scalar loads and stores to the PPC back end

This patch corresponds to review:
http://reviews.llvm.org/D9440

It adds a new register class to the PPC back end to contain single precision
values in VSX registers. Additionally, it adds scalar loads and stores for
VSX registers.

llvm-svn: 236755

1 files changed, 12 insertions, 1 deletions

diff --git a/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp b/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
index c9c2949dc6c..85ba5a1d640 100644
--- a/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
+++ b/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
@@ -815,7 +815,8 @@ void PPCInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
     // copies are generated, they are close enough to some use that the
     // lower-latency form is preferable.
     Opc = PPC::XXLOR;
-  else if (PPC::VSFRCRegClass.contains(DestReg, SrcReg))
+  else if (PPC::VSFRCRegClass.contains(DestReg, SrcReg) ||
+           PPC::VSSRCRegClass.contains(DestReg, SrcReg))
     Opc = PPC::XXLORf;
   else if (PPC::QFRCRegClass.contains(DestReg, SrcReg))
     Opc = PPC::QVFMR;
@@ -900,6 +901,12 @@ PPCInstrInfo::StoreRegToStackSlot(MachineFunction &MF,
                                                getKillRegState(isKill)),
                                        FrameIdx));
     NonRI = true;
+  } else if (PPC::VSSRCRegClass.hasSubClassEq(RC)) {
+    NewMIs.push_back(addFrameReference(BuildMI(MF, DL, get(PPC::STXSSPX))
+                                       .addReg(SrcReg,
+                                               getKillRegState(isKill)),
+                                       FrameIdx));
+    NonRI = true;
   } else if (PPC::VRSAVERCRegClass.hasSubClassEq(RC)) {
     assert(Subtarget.isDarwin() &&
            "VRSAVE only needs spill/restore on Darwin");
@@ -1013,6 +1020,10 @@ PPCInstrInfo::LoadRegFromStackSlot(MachineFunction &MF, DebugLoc DL,
     NewMIs.push_back(addFrameReference(BuildMI(MF, DL, get(PPC::LXSDX), DestReg),
                                        FrameIdx));
     NonRI = true;
+  } else if (PPC::VSSRCRegClass.hasSubClassEq(RC)) {
+    NewMIs.push_back(addFrameReference(BuildMI(MF, DL, get(PPC::LXSSPX), DestReg),
+                                       FrameIdx));
+    NonRI = true;
   } else if (PPC::VRSAVERCRegClass.hasSubClassEq(RC)) {
     assert(Subtarget.isDarwin() &&
            "VRSAVE only needs spill/restore on Darwin");