[AArch64] Add an assert to ensure we don't scale an offset that can't be scaled.

llvm-svn: 260272

1 files changed, 3 insertions, 1 deletions

diff --git a/llvm/lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp b/llvm/lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp
index f85d6a8f2dc9..d07ef3cecccd 100644
--- a/llvm/lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp
+++ b/llvm/lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp
@@ -842,8 +842,10 @@ AArch64LoadStoreOpt::mergePairedInsns(MachineBasicBlock::iterator I,
   }
   int OffsetImm = getLdStOffsetOp(RtMI).getImm();
   // Handle Unscaled.
-  if (IsUnscaled)
+  if (IsUnscaled) {
+    assert (!(OffsetImm % OffsetStride) && "Unscaled offset cannot be scaled.");
     OffsetImm /= OffsetStride;
+  }
 
   // Construct the new instruction.
   MachineInstrBuilder MIB;