diff --git a/src/mesa/drivers/dri/i965/brw_nir_intrinsics.c b/src/mesa/drivers/dri/i965/brw_nir_intrinsics.c index 9ae161f53df..d63570fa2a7 100644 --- a/src/mesa/drivers/dri/i965/brw_nir_intrinsics.c +++ b/src/mesa/drivers/dri/i965/brw_nir_intrinsics.c @@ -39,12 +39,21 @@ struct lower_intrinsics_state { static nir_ssa_def * read_thread_local_id(struct lower_intrinsics_state *state) { + nir_builder *b = &state->builder; + nir_shader *nir = state->nir; + const unsigned *sizes = nir->info.cs.local_size; + const unsigned group_size = sizes[0] * sizes[1] * sizes[2]; + + /* Some programs have local_size dimensions so small that the thread local + * ID will always be 0. + */ + if (group_size <= 8) + return nir_imm_int(b, 0); + assert(state->cs_prog_data->thread_local_id_index >= 0); state->cs_thread_id_used = true; const int id_index = state->cs_prog_data->thread_local_id_index; - nir_builder *b = &state->builder; - nir_shader *nir = state->nir; nir_intrinsic_instr *load = nir_intrinsic_instr_create(nir, nir_intrinsic_load_uniform); load->num_components = 1;