Expand on the safeness of restoring the sp from the fp a bit more.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123193 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/Target/ARM/ARMFrameLowering.cpp b/lib/Target/ARM/ARMFrameLowering.cpp
index 824538ccd7..adff2399c7 100644
--- a/lib/Target/ARM/ARMFrameLowering.cpp
+++ b/lib/Target/ARM/ARMFrameLowering.cpp
@@ -288,7 +288,8 @@ void ARMFrameLowering::emitPrologue(MachineFunction &MF) const {
   }
 
   // If the frame has variable sized objects then the epilogue must restore
-  // the sp from fp.
+  // the sp from fp. We can assume there's an FP here since hasFP already
+  // checks for hasVarSizedObjects.
   if (MFI->hasVarSizedObjects())
     AFI->setShouldRestoreSPFromFP(true);
 }