Create the virtual register for the global base in the intersection of

GPRC and GPRC_NOR0 (or the 64bit equivalent) and not just the latter.
GPRC_NOR0 contains ZERO as alternative meaning of r0 and is therefore
not a true subclass of GPRC.

llvm-svn: 285813

diff --git a/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp b/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
index cf8b858..1e51c1f 100644 (file)
--- a/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
@@ -334,12 +334,12 @@ SDNode *PPCDAGToDAGISel::getGlobalBaseReg() {
         }
       } else {
         GlobalBaseReg =
-          RegInfo->createVirtualRegister(&PPC::GPRC_NOR0RegClass);
+          RegInfo->createVirtualRegister(&PPC::GPRC_and_GPRC_NOR0RegClass);
         BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MovePCtoLR));
         BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MFLR), GlobalBaseReg);
       }
     } else {
-      GlobalBaseReg = RegInfo->createVirtualRegister(&PPC::G8RC_NOX0RegClass);
+      GlobalBaseReg = RegInfo->createVirtualRegister(&PPC::G8RC_and_G8RC_NOX0RegClass);
       BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MovePCtoLR8));
       BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MFLR8), GlobalBaseReg);
     }