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nir/lower_io: Add a assign_locations function that sorts by [in]direct use

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v2: Delete the set of indirectly accessed variables when we're done with it
v3: Rename from _packed to _scalar

Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
This commit is contained in:
Jason Ekstrand
2015-03-18 15:05:28 -07:00
parent 25db44a845
commit 8a33f95b7a
2 changed files with 75 additions and 0 deletions
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4
src/glsl/nir/nir.h
View File

@@ -1579,6 +1579,10 @@ void nir_lower_locals_to_regs(nir_shader *shader);
void nir_assign_var_locations_scalar(struct exec_list *var_list,
unsigned *size);
void nir_assign_var_locations_scalar_direct_first(nir_shader *shader,
struct exec_list *var_list,
unsigned *direct_size,
unsigned *size);
void nir_lower_io(nir_shader *shader);

71
src/glsl/nir/nir_lower_io.c
View File

@@ -110,6 +110,77 @@ deref_has_indirect(nir_deref_var *deref)
return false;
}
static bool
mark_indirect_uses_block(nir_block *block, void *void_state)
{
struct set *indirect_set = void_state;
nir_foreach_instr(block, instr) {
if (instr->type != nir_instr_type_intrinsic)
continue;
nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
for (unsigned i = 0;
i < nir_intrinsic_infos[intrin->intrinsic].num_variables; i++) {
if (deref_has_indirect(intrin->variables[i]))
_mesa_set_add(indirect_set, intrin->variables[i]->var);
}
}
return true;
}
/* Identical to nir_assign_var_locations_packed except that it assigns
* locations to the variables that are used 100% directly first and then
* assigns locations to variables that are used indirectly.
*/
void
nir_assign_var_locations_scalar_direct_first(nir_shader *shader,
struct exec_list *var_list,
unsigned *direct_size,
unsigned *size)
{
struct set *indirect_set = _mesa_set_create(NULL, _mesa_hash_pointer,
_mesa_key_pointer_equal);
nir_foreach_overload(shader, overload) {
if (overload->impl)
nir_foreach_block(overload->impl, mark_indirect_uses_block,
indirect_set);
}
unsigned location = 0;
foreach_list_typed(nir_variable, var, node, var_list) {
if (var->data.mode == nir_var_uniform && var->interface_type != NULL)
continue;
if (_mesa_set_search(indirect_set, var))
continue;
var->data.driver_location = location;
location += type_size(var->type);
}
*direct_size = location;
foreach_list_typed(nir_variable, var, node, var_list) {
if (var->data.mode == nir_var_uniform && var->interface_type != NULL)
continue;
if (!_mesa_set_search(indirect_set, var))
continue;
var->data.driver_location = location;
location += type_size(var->type);
}
*size = location;
_mesa_set_destroy(indirect_set, NULL);
}
static unsigned
get_io_offset(nir_deref_var *deref, nir_instr *instr, nir_src *indirect,
struct lower_io_state *state)