[SystemZ] Save/restore r6 and r7 if function contains landing pad.
This fixes PR27102.
Differential Revision: http://reviews.llvm.org/D18541
llvm-svn: 274017
diff --git a/llvm/lib/Target/SystemZ/SystemZFrameLowering.cpp b/llvm/lib/Target/SystemZ/SystemZFrameLowering.cpp
index a1f036d..ccaed49 100644
--- a/llvm/lib/Target/SystemZ/SystemZFrameLowering.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZFrameLowering.cpp
@@ -81,6 +81,12 @@
for (unsigned I = MFI->getVarArgsFirstGPR(); I < SystemZ::NumArgGPRs; ++I)
SavedRegs.set(SystemZ::ArgGPRs[I]);
+ // If there are any landing pads, entering them will modify r6/r7.
+ if (!MF.getMMI().getLandingPads().empty()) {
+ SavedRegs.set(SystemZ::R6D);
+ SavedRegs.set(SystemZ::R7D);
+ }
+
// If the function requires a frame pointer, record that the hard
// frame pointer will be clobbered.
if (HasFP)