[X86][SSE] Add an assert to ensure that rotation amount is converted to a scale

Missed in rL332832 where we added SSE v4i32 rotations for PR37426.

llvm-svn: 332844

diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index 8809c9c..4614e24 100644 (file)
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -23825,6 +23825,7 @@ static SDValue LowerRotate(SDValue Op, const X86Subtarget &Subtarget,
   // to v2i64 results at a time. The upper 32-bits contain the wrapped bits
   // that can then be OR'd with the lower 32-bits.
   Amt = convertShiftLeftToScale(Amt, DL, Subtarget, DAG);
+  assert(Amt && "Failed to convert ROTL amount to scale");
 
   static const int OddMask[] = {1, -1, 3, -1};
   SDValue R13 = DAG.getVectorShuffle(VT, DL, R, R, OddMask);