diff --git a/llvm/lib/Target/AMDGPU/VOPDInstructions.td b/llvm/lib/Target/AMDGPU/VOPDInstructions.td
--- a/llvm/lib/Target/AMDGPU/VOPDInstructions.td
+++ b/llvm/lib/Target/AMDGPU/VOPDInstructions.td
@@ -111,6 +111,7 @@
   let Inst{16-9} = !if (!eq(VDX.Mnemonic, "v_mov_b32"), 0x0, vsrc1X);
   let Inst{48-41} = !if (!eq(VDY.Mnemonic, "v_mov_b32"), 0x0, vsrc1Y);
   let Size = 12;
+  let FixedSize = 1;
 }
 
 // V_DUAL_DOT2ACC_F32_BF16 is a legal instruction, but V_DOT2ACC_F32_BF16 is