diff --git a/llvm/lib/Target/AMDGPU/SOPInstructions.td b/llvm/lib/Target/AMDGPU/SOPInstructions.td
--- a/llvm/lib/Target/AMDGPU/SOPInstructions.td
+++ b/llvm/lib/Target/AMDGPU/SOPInstructions.td
@@ -722,6 +722,7 @@
   let hasSideEffects = 0;
   let SALU = 1;
   let SOPK = 1;
+  let FixedSize = 1;
   let SchedRW = [WriteSALU];
   let UseNamedOperandTable = 1;
   string Mnemonic = opName;