Index: include/llvm/IR/IntrinsicsAMDGPU.td
===================================================================
--- include/llvm/IR/IntrinsicsAMDGPU.td
+++ include/llvm/IR/IntrinsicsAMDGPU.td
@@ -185,7 +185,7 @@
 def int_amdgcn_init_exec_from_input : Intrinsic<[],
   [llvm_i32_ty,       // 32-bit SGPR input
    llvm_i32_ty],      // bit offset of the thread count
-  [IntrConvergent]>;
+  [IntrConvergent, ImmArg<1>]>;
 
 def int_amdgcn_wavefrontsize :
   GCCBuiltin<"__builtin_amdgcn_wavefrontsize">,