diff options
| -rw-r--r-- | src/compiler/nir/nir_opt_undef.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/src/compiler/nir/nir_opt_undef.c b/src/compiler/nir/nir_opt_undef.c index a7bb887..c4777a8 100644 --- a/src/compiler/nir/nir_opt_undef.c +++ b/src/compiler/nir/nir_opt_undef.c @@ -100,6 +100,33 @@ opt_undef_vecN(nir_builder *b, nir_alu_instr *alu) return true; } +/** + * Remove any store intrinsics whose value is undefined (the existing + * value is a fine representation of "undefined"). + */ +static bool +opt_undef_store(nir_intrinsic_instr *intrin) +{ + switch (intrin->intrinsic) { + case nir_intrinsic_store_var: + case nir_intrinsic_store_output: + case nir_intrinsic_store_per_vertex_output: + case nir_intrinsic_store_ssbo: + case nir_intrinsic_store_shared: + break; + default: + return false; + } + + if (!intrin->src[0].is_ssa || + intrin->src[0].ssa->parent_instr->type != nir_instr_type_ssa_undef) + return false; + + nir_instr_remove(&intrin->instr); + + return true; +} + bool nir_opt_undef(nir_shader *shader) { @@ -116,6 +143,9 @@ nir_opt_undef(nir_shader *shader) 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; } } } |