diff options
| author | Eric Anholt <eric@anholt.net> | 2017-10-16 15:32:30 -0700 |
|---|---|---|
| committer | Eric Anholt <eric@anholt.net> | 2017-10-20 16:26:07 -0700 |
| commit | d9ce4ac990090b3fa940a662655b61359f296be0 (patch) | |
| tree | e508ee2f667c9deb4a0ce0ffad71676b578596b7 /src/compiler/nir/nir_remove_dead_variables.c | |
| parent | a2c6fbb3ee16a58a9098b031a6382618d570bee8 (diff) | |
nir: Add a safety check that we don't remove dead I/O vars after lowering.
The pass only looks at var load/store intrinsics, not input load/store
intrinsics, so assert that we don't see the other type.
v2: Adjust comment indentation.
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Diffstat (limited to 'src/compiler/nir/nir_remove_dead_variables.c')
| -rw-r--r-- | src/compiler/nir/nir_remove_dead_variables.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/src/compiler/nir/nir_remove_dead_variables.c b/src/compiler/nir/nir_remove_dead_variables.c index a1fe0de9c61..eff66f92d43 100644 --- a/src/compiler/nir/nir_remove_dead_variables.c +++ b/src/compiler/nir/nir_remove_dead_variables.c @@ -28,7 +28,8 @@ #include "nir.h" static void -add_var_use_intrinsic(nir_intrinsic_instr *instr, struct set *live) +add_var_use_intrinsic(nir_intrinsic_instr *instr, struct set *live, + nir_variable_mode modes) { unsigned num_vars = nir_intrinsic_infos[instr->intrinsic].num_variables; @@ -47,6 +48,14 @@ add_var_use_intrinsic(nir_intrinsic_instr *instr, struct set *live) break; } + /* This pass can't be used on I/O variables after they've been lowered. */ + case nir_intrinsic_load_input: + assert(!(modes & nir_var_shader_in)); + break; + case nir_intrinsic_store_output: + assert(!(modes & nir_var_shader_out)); + break; + default: for (unsigned i = 0; i < num_vars; i++) { _mesa_set_add(live, instr->variables[i]->var); @@ -84,7 +93,7 @@ add_var_use_tex(nir_tex_instr *instr, struct set *live) } static void -add_var_use_shader(nir_shader *shader, struct set *live) +add_var_use_shader(nir_shader *shader, struct set *live, nir_variable_mode modes) { nir_foreach_function(function, shader) { if (function->impl) { @@ -92,7 +101,8 @@ add_var_use_shader(nir_shader *shader, struct set *live) nir_foreach_instr(instr, block) { switch(instr->type) { case nir_instr_type_intrinsic: - add_var_use_intrinsic(nir_instr_as_intrinsic(instr), live); + add_var_use_intrinsic(nir_instr_as_intrinsic(instr), live, + modes); break; case nir_instr_type_call: @@ -162,7 +172,7 @@ nir_remove_dead_variables(nir_shader *shader, nir_variable_mode modes) struct set *live = _mesa_set_create(NULL, _mesa_hash_pointer, _mesa_key_pointer_equal); - add_var_use_shader(shader, live); + add_var_use_shader(shader, live, modes); if (modes & nir_var_uniform) progress = remove_dead_vars(&shader->uniforms, live) || progress; |