1 files changed, 5 insertions, 2 deletions
diff --git a/llvm/lib/CodeGen/TargetFrameLoweringImpl.cpp b/llvm/lib/CodeGen/TargetFrameLoweringImpl.cpp
index 679ade185e1..0a0e0795c66 100644
--- a/llvm/lib/CodeGen/TargetFrameLoweringImpl.cpp
+++ b/llvm/lib/CodeGen/TargetFrameLoweringImpl.cpp
@@ -63,12 +63,15 @@ void TargetFrameLowering::determineCalleeSaves(MachineFunction &MF,
   const TargetRegisterInfo &TRI = *MF.getSubtarget().getRegisterInfo();
   const MCPhysReg *CSRegs = TRI.getCalleeSavedRegs(&MF);
 
+  // Resize before the early returns. Some backends expect that
+  // SavedRegs.size() == TRI.getNumRegs() after this call even if there are no
+  // saved registers.
+  SavedRegs.resize(TRI.getNumRegs());
+
   // Early exit if there are no callee saved registers.
   if (!CSRegs || CSRegs[0] == 0)
     return;
 
-  SavedRegs.resize(TRI.getNumRegs());
-
   // In Naked functions we aren't going to save any registers.
   if (MF.getFunction()->hasFnAttribute(Attribute::Naked))
     return;