- nir_builder b;
- bool progress = false;
-
- nir_foreach_function(function, shader) {
- if (function->impl) {
- nir_builder_init(&b, function->impl);
- nir_foreach_block(block, function->impl) {
- nir_foreach_instr_safe(instr, block) {
- if (instr->type == nir_instr_type_alu) {
- nir_alu_instr *alu = nir_instr_as_alu(instr);
-
- progress = opt_undef_csel(alu) || progress;
- progress = opt_undef_vecN(&b, alu) || progress;
- } else if (instr->type == nir_instr_type_intrinsic) {
- nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
- progress = opt_undef_store(intrin) || progress;
- }
- }
- }
-
- if (progress) {
- nir_metadata_preserve(function->impl,
- nir_metadata_block_index |
- nir_metadata_dominance);
- } else {
- nir_metadata_preserve(function->impl, nir_metadata_all);
- }
- }
+ if (instr->type == nir_instr_type_alu) {
+ nir_alu_instr *alu = nir_instr_as_alu(instr);
+ return opt_undef_csel(alu) || opt_undef_vecN(b, alu);
+ } else if (instr->type == nir_instr_type_intrinsic) {
+ nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
+ return opt_undef_store(intrin);