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|
/*
* Copyright © 2015 Red Hat
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "nir.h"
#include "nir_control_flow.h"
/* Secret Decoder Ring:
* clone_foo():
* Allocate and clone a foo.
* __clone_foo():
* Clone body of foo (ie. parent class, embedded struct, etc)
*/
typedef struct {
/* True if we are cloning an entire shader. */
bool global_clone;
/* If true allows the clone operation to fall back to the original pointer
* if no clone pointer is found in the remap table. This allows us to
* clone a loop body without having to add srcs from outside the loop to
* the remap table. This is useful for loop unrolling.
*/
bool allow_remap_fallback;
/* maps orig ptr -> cloned ptr: */
struct hash_table *remap_table;
/* List of phi sources. */
struct list_head phi_srcs;
/* new shader object, used as memctx for just about everything else: */
nir_shader *ns;
} clone_state;
static void
init_clone_state(clone_state *state, struct hash_table *remap_table,
bool global, bool allow_remap_fallback)
{
state->global_clone = global;
state->allow_remap_fallback = allow_remap_fallback;
if (remap_table) {
state->remap_table = remap_table;
} else {
state->remap_table = _mesa_hash_table_create(NULL, _mesa_hash_pointer,
_mesa_key_pointer_equal);
}
list_inithead(&state->phi_srcs);
}
static void
free_clone_state(clone_state *state)
{
_mesa_hash_table_destroy(state->remap_table, NULL);
}
static inline void *
_lookup_ptr(clone_state *state, const void *ptr, bool global)
{
struct hash_entry *entry;
if (!ptr)
return NULL;
if (!state->global_clone && global)
return (void *)ptr;
entry = _mesa_hash_table_search(state->remap_table, ptr);
if (!entry) {
assert(state->allow_remap_fallback);
return (void *)ptr;
}
return entry->data;
}
static void
add_remap(clone_state *state, void *nptr, const void *ptr)
{
_mesa_hash_table_insert(state->remap_table, ptr, nptr);
}
static void *
remap_local(clone_state *state, const void *ptr)
{
return _lookup_ptr(state, ptr, false);
}
static void *
remap_global(clone_state *state, const void *ptr)
{
return _lookup_ptr(state, ptr, true);
}
static nir_register *
remap_reg(clone_state *state, const nir_register *reg)
{
return _lookup_ptr(state, reg, reg->is_global);
}
static nir_variable *
remap_var(clone_state *state, const nir_variable *var)
{
return _lookup_ptr(state, var, nir_variable_is_global(var));
}
nir_constant *
nir_constant_clone(const nir_constant *c, nir_variable *nvar)
{
nir_constant *nc = ralloc(nvar, nir_constant);
memcpy(nc->values, c->values, sizeof(nc->values));
nc->num_elements = c->num_elements;
nc->elements = ralloc_array(nvar, nir_constant *, c->num_elements);
for (unsigned i = 0; i < c->num_elements; i++) {
nc->elements[i] = nir_constant_clone(c->elements[i], nvar);
}
return nc;
}
/* NOTE: for cloning nir_variables, bypass nir_variable_create to avoid
* having to deal with locals and globals separately:
*/
nir_variable *
nir_variable_clone(const nir_variable *var, nir_shader *shader)
{
nir_variable *nvar = rzalloc(shader, nir_variable);
nvar->type = var->type;
nvar->name = ralloc_strdup(nvar, var->name);
nvar->data = var->data;
nvar->num_state_slots = var->num_state_slots;
nvar->state_slots = ralloc_array(nvar, nir_state_slot, var->num_state_slots);
memcpy(nvar->state_slots, var->state_slots,
var->num_state_slots * sizeof(nir_state_slot));
if (var->constant_initializer) {
nvar->constant_initializer =
nir_constant_clone(var->constant_initializer, nvar);
}
nvar->interface_type = var->interface_type;
return nvar;
}
static nir_variable *
clone_variable(clone_state *state, const nir_variable *var)
{
nir_variable *nvar = nir_variable_clone(var, state->ns);
add_remap(state, nvar, var);
return nvar;
}
/* clone list of nir_variable: */
static void
clone_var_list(clone_state *state, struct exec_list *dst,
const struct exec_list *list)
{
exec_list_make_empty(dst);
foreach_list_typed(nir_variable, var, node, list) {
nir_variable *nvar = clone_variable(state, var);
exec_list_push_tail(dst, &nvar->node);
}
}
/* NOTE: for cloning nir_registers, bypass nir_global/local_reg_create()
* to avoid having to deal with locals and globals separately:
*/
static nir_register *
clone_register(clone_state *state, const nir_register *reg)
{
nir_register *nreg = rzalloc(state->ns, nir_register);
add_remap(state, nreg, reg);
nreg->num_components = reg->num_components;
nreg->bit_size = reg->bit_size;
nreg->num_array_elems = reg->num_array_elems;
nreg->index = reg->index;
nreg->name = ralloc_strdup(nreg, reg->name);
nreg->is_global = reg->is_global;
nreg->is_packed = reg->is_packed;
/* reconstructing uses/defs/if_uses handled by nir_instr_insert() */
list_inithead(&nreg->uses);
list_inithead(&nreg->defs);
list_inithead(&nreg->if_uses);
return nreg;
}
/* clone list of nir_register: */
static void
clone_reg_list(clone_state *state, struct exec_list *dst,
const struct exec_list *list)
{
exec_list_make_empty(dst);
foreach_list_typed(nir_register, reg, node, list) {
nir_register *nreg = clone_register(state, reg);
exec_list_push_tail(dst, &nreg->node);
}
}
static void
__clone_src(clone_state *state, void *ninstr_or_if,
nir_src *nsrc, const nir_src *src)
{
nsrc->is_ssa = src->is_ssa;
if (src->is_ssa) {
nsrc->ssa = remap_local(state, src->ssa);
} else {
nsrc->reg.reg = remap_reg(state, src->reg.reg);
if (src->reg.indirect) {
nsrc->reg.indirect = ralloc(ninstr_or_if, nir_src);
__clone_src(state, ninstr_or_if, nsrc->reg.indirect, src->reg.indirect);
}
nsrc->reg.base_offset = src->reg.base_offset;
}
}
static void
__clone_dst(clone_state *state, nir_instr *ninstr,
nir_dest *ndst, const nir_dest *dst)
{
ndst->is_ssa = dst->is_ssa;
if (dst->is_ssa) {
nir_ssa_dest_init(ninstr, ndst, dst->ssa.num_components,
dst->ssa.bit_size, dst->ssa.name);
add_remap(state, &ndst->ssa, &dst->ssa);
} else {
ndst->reg.reg = remap_reg(state, dst->reg.reg);
if (dst->reg.indirect) {
ndst->reg.indirect = ralloc(ninstr, nir_src);
__clone_src(state, ninstr, ndst->reg.indirect, dst->reg.indirect);
}
ndst->reg.base_offset = dst->reg.base_offset;
}
}
static nir_deref *clone_deref(clone_state *state, const nir_deref *deref,
nir_instr *ninstr, nir_deref *parent);
static nir_deref_var *
clone_deref_var(clone_state *state, const nir_deref_var *dvar,
nir_instr *ninstr)
{
nir_variable *nvar = remap_var(state, dvar->var);
nir_deref_var *ndvar = nir_deref_var_create(ninstr, nvar);
if (dvar->deref.child)
ndvar->deref.child = clone_deref(state, dvar->deref.child,
ninstr, &ndvar->deref);
return ndvar;
}
static nir_deref_array *
clone_deref_array(clone_state *state, const nir_deref_array *darr,
nir_instr *ninstr, nir_deref *parent)
{
nir_deref_array *ndarr = nir_deref_array_create(parent);
ndarr->deref.type = darr->deref.type;
if (darr->deref.child)
ndarr->deref.child = clone_deref(state, darr->deref.child,
ninstr, &ndarr->deref);
ndarr->deref_array_type = darr->deref_array_type;
ndarr->base_offset = darr->base_offset;
if (ndarr->deref_array_type == nir_deref_array_type_indirect)
__clone_src(state, ninstr, &ndarr->indirect, &darr->indirect);
return ndarr;
}
static nir_deref_struct *
clone_deref_struct(clone_state *state, const nir_deref_struct *dstr,
nir_instr *ninstr, nir_deref *parent)
{
nir_deref_struct *ndstr = nir_deref_struct_create(parent, dstr->index);
ndstr->deref.type = dstr->deref.type;
if (dstr->deref.child)
ndstr->deref.child = clone_deref(state, dstr->deref.child,
ninstr, &ndstr->deref);
return ndstr;
}
static nir_deref *
clone_deref(clone_state *state, const nir_deref *dref,
nir_instr *ninstr, nir_deref *parent)
{
switch (dref->deref_type) {
case nir_deref_type_array:
return &clone_deref_array(state, nir_deref_as_array(dref),
ninstr, parent)->deref;
case nir_deref_type_struct:
return &clone_deref_struct(state, nir_deref_as_struct(dref),
ninstr, parent)->deref;
default:
unreachable("bad deref type");
return NULL;
}
}
static nir_alu_instr *
clone_alu(clone_state *state, const nir_alu_instr *alu)
{
nir_alu_instr *nalu = nir_alu_instr_create(state->ns, alu->op);
nalu->exact = alu->exact;
__clone_dst(state, &nalu->instr, &nalu->dest.dest, &alu->dest.dest);
nalu->dest.saturate = alu->dest.saturate;
nalu->dest.write_mask = alu->dest.write_mask;
for (unsigned i = 0; i < nir_op_infos[alu->op].num_inputs; i++) {
__clone_src(state, &nalu->instr, &nalu->src[i].src, &alu->src[i].src);
nalu->src[i].negate = alu->src[i].negate;
nalu->src[i].abs = alu->src[i].abs;
memcpy(nalu->src[i].swizzle, alu->src[i].swizzle,
sizeof(nalu->src[i].swizzle));
}
return nalu;
}
static nir_intrinsic_instr *
clone_intrinsic(clone_state *state, const nir_intrinsic_instr *itr)
{
nir_intrinsic_instr *nitr =
nir_intrinsic_instr_create(state->ns, itr->intrinsic);
unsigned num_variables = nir_intrinsic_infos[itr->intrinsic].num_variables;
unsigned num_srcs = nir_intrinsic_infos[itr->intrinsic].num_srcs;
if (nir_intrinsic_infos[itr->intrinsic].has_dest)
__clone_dst(state, &nitr->instr, &nitr->dest, &itr->dest);
nitr->num_components = itr->num_components;
memcpy(nitr->const_index, itr->const_index, sizeof(nitr->const_index));
for (unsigned i = 0; i < num_variables; i++) {
nitr->variables[i] = clone_deref_var(state, itr->variables[i],
&nitr->instr);
}
for (unsigned i = 0; i < num_srcs; i++)
__clone_src(state, &nitr->instr, &nitr->src[i], &itr->src[i]);
return nitr;
}
static nir_load_const_instr *
clone_load_const(clone_state *state, const nir_load_const_instr *lc)
{
nir_load_const_instr *nlc =
nir_load_const_instr_create(state->ns, lc->def.num_components,
lc->def.bit_size);
memcpy(&nlc->value, &lc->value, sizeof(nlc->value));
add_remap(state, &nlc->def, &lc->def);
return nlc;
}
static nir_ssa_undef_instr *
clone_ssa_undef(clone_state *state, const nir_ssa_undef_instr *sa)
{
nir_ssa_undef_instr *nsa =
nir_ssa_undef_instr_create(state->ns, sa->def.num_components,
sa->def.bit_size);
add_remap(state, &nsa->def, &sa->def);
return nsa;
}
static nir_tex_instr *
clone_tex(clone_state *state, const nir_tex_instr *tex)
{
nir_tex_instr *ntex = nir_tex_instr_create(state->ns, tex->num_srcs);
ntex->sampler_dim = tex->sampler_dim;
ntex->dest_type = tex->dest_type;
ntex->op = tex->op;
__clone_dst(state, &ntex->instr, &ntex->dest, &tex->dest);
for (unsigned i = 0; i < ntex->num_srcs; i++) {
ntex->src[i].src_type = tex->src[i].src_type;
__clone_src(state, &ntex->instr, &ntex->src[i].src, &tex->src[i].src);
}
ntex->coord_components = tex->coord_components;
ntex->is_array = tex->is_array;
ntex->is_shadow = tex->is_shadow;
ntex->is_new_style_shadow = tex->is_new_style_shadow;
ntex->component = tex->component;
ntex->texture_index = tex->texture_index;
if (tex->texture)
ntex->texture = clone_deref_var(state, tex->texture, &ntex->instr);
ntex->texture_array_size = tex->texture_array_size;
ntex->sampler_index = tex->sampler_index;
if (tex->sampler)
ntex->sampler = clone_deref_var(state, tex->sampler, &ntex->instr);
return ntex;
}
static nir_phi_instr *
clone_phi(clone_state *state, const nir_phi_instr *phi, nir_block *nblk)
{
nir_phi_instr *nphi = nir_phi_instr_create(state->ns);
__clone_dst(state, &nphi->instr, &nphi->dest, &phi->dest);
/* Cloning a phi node is a bit different from other instructions. The
* sources of phi instructions are the only time where we can use an SSA
* def before it is defined. In order to handle this, we just copy over
* the sources from the old phi instruction directly and then fix them up
* in a second pass once all the instrutions in the function have been
* properly cloned.
*
* In order to ensure that the copied sources (which are the same as the
* old phi instruction's sources for now) don't get inserted into the old
* shader's use-def lists, we have to add the phi instruction *before* we
* set up its sources.
*/
nir_instr_insert_after_block(nblk, &nphi->instr);
foreach_list_typed(nir_phi_src, src, node, &phi->srcs) {
nir_phi_src *nsrc = ralloc(nphi, nir_phi_src);
/* Just copy the old source for now. */
memcpy(nsrc, src, sizeof(*src));
/* Since we're not letting nir_insert_instr handle use/def stuff for us,
* we have to set the parent_instr manually. It doesn't really matter
* when we do it, so we might as well do it here.
*/
nsrc->src.parent_instr = &nphi->instr;
/* Stash it in the list of phi sources. We'll walk this list and fix up
* sources at the very end of clone_function_impl.
*/
list_add(&nsrc->src.use_link, &state->phi_srcs);
exec_list_push_tail(&nphi->srcs, &nsrc->node);
}
return nphi;
}
static nir_jump_instr *
clone_jump(clone_state *state, const nir_jump_instr *jmp)
{
nir_jump_instr *njmp = nir_jump_instr_create(state->ns, jmp->type);
return njmp;
}
static nir_call_instr *
clone_call(clone_state *state, const nir_call_instr *call)
{
nir_function *ncallee = remap_global(state, call->callee);
nir_call_instr *ncall = nir_call_instr_create(state->ns, ncallee);
for (unsigned i = 0; i < ncall->num_params; i++)
ncall->params[i] = clone_deref_var(state, call->params[i], &ncall->instr);
ncall->return_deref = clone_deref_var(state, call->return_deref,
&ncall->instr);
return ncall;
}
static nir_instr *
clone_instr(clone_state *state, const nir_instr *instr)
{
switch (instr->type) {
case nir_instr_type_alu:
return &clone_alu(state, nir_instr_as_alu(instr))->instr;
case nir_instr_type_intrinsic:
return &clone_intrinsic(state, nir_instr_as_intrinsic(instr))->instr;
case nir_instr_type_load_const:
return &clone_load_const(state, nir_instr_as_load_const(instr))->instr;
case nir_instr_type_ssa_undef:
return &clone_ssa_undef(state, nir_instr_as_ssa_undef(instr))->instr;
case nir_instr_type_tex:
return &clone_tex(state, nir_instr_as_tex(instr))->instr;
case nir_instr_type_phi:
unreachable("Cannot clone phis with clone_instr");
case nir_instr_type_jump:
return &clone_jump(state, nir_instr_as_jump(instr))->instr;
case nir_instr_type_call:
return &clone_call(state, nir_instr_as_call(instr))->instr;
case nir_instr_type_parallel_copy:
unreachable("Cannot clone parallel copies");
default:
unreachable("bad instr type");
return NULL;
}
}
static nir_block *
clone_block(clone_state *state, struct exec_list *cf_list, const nir_block *blk)
{
/* Don't actually create a new block. Just use the one from the tail of
* the list. NIR guarantees that the tail of the list is a block and that
* no two blocks are side-by-side in the IR; It should be empty.
*/
nir_block *nblk =
exec_node_data(nir_block, exec_list_get_tail(cf_list), cf_node.node);
assert(nblk->cf_node.type == nir_cf_node_block);
assert(exec_list_is_empty(&nblk->instr_list));
/* We need this for phi sources */
add_remap(state, nblk, blk);
nir_foreach_instr(instr, blk) {
if (instr->type == nir_instr_type_phi) {
/* Phi instructions are a bit of a special case when cloning because
* we don't want inserting the instruction to automatically handle
* use/defs for us. Instead, we need to wait until all the
* blocks/instructions are in so that we can set their sources up.
*/
clone_phi(state, nir_instr_as_phi(instr), nblk);
} else {
nir_instr *ninstr = clone_instr(state, instr);
nir_instr_insert_after_block(nblk, ninstr);
}
}
return nblk;
}
static void
clone_cf_list(clone_state *state, struct exec_list *dst,
const struct exec_list *list);
static nir_if *
clone_if(clone_state *state, struct exec_list *cf_list, const nir_if *i)
{
nir_if *ni = nir_if_create(state->ns);
__clone_src(state, ni, &ni->condition, &i->condition);
nir_cf_node_insert_end(cf_list, &ni->cf_node);
clone_cf_list(state, &ni->then_list, &i->then_list);
clone_cf_list(state, &ni->else_list, &i->else_list);
return ni;
}
static nir_loop *
clone_loop(clone_state *state, struct exec_list *cf_list, const nir_loop *loop)
{
nir_loop *nloop = nir_loop_create(state->ns);
nir_cf_node_insert_end(cf_list, &nloop->cf_node);
clone_cf_list(state, &nloop->body, &loop->body);
return nloop;
}
/* clone list of nir_cf_node: */
static void
clone_cf_list(clone_state *state, struct exec_list *dst,
const struct exec_list *list)
{
foreach_list_typed(nir_cf_node, cf, node, list) {
switch (cf->type) {
case nir_cf_node_block:
clone_block(state, dst, nir_cf_node_as_block(cf));
break;
case nir_cf_node_if:
clone_if(state, dst, nir_cf_node_as_if(cf));
break;
case nir_cf_node_loop:
clone_loop(state, dst, nir_cf_node_as_loop(cf));
break;
default:
unreachable("bad cf type");
}
}
}
/* After we've cloned almost everything, we have to walk the list of phi
* sources and fix them up. Thanks to loops, the block and SSA value for a
* phi source may not be defined when we first encounter it. Instead, we
* add it to the phi_srcs list and we fix it up here.
*/
static void
fixup_phi_srcs(clone_state *state)
{
list_for_each_entry_safe(nir_phi_src, src, &state->phi_srcs, src.use_link) {
src->pred = remap_local(state, src->pred);
/* Remove from this list */
list_del(&src->src.use_link);
if (src->src.is_ssa) {
src->src.ssa = remap_local(state, src->src.ssa);
list_addtail(&src->src.use_link, &src->src.ssa->uses);
} else {
src->src.reg.reg = remap_reg(state, src->src.reg.reg);
list_addtail(&src->src.use_link, &src->src.reg.reg->uses);
}
}
assert(list_empty(&state->phi_srcs));
}
void
nir_cf_list_clone(nir_cf_list *dst, nir_cf_list *src, nir_cf_node *parent,
struct hash_table *remap_table)
{
exec_list_make_empty(&dst->list);
dst->impl = src->impl;
if (exec_list_is_empty(&src->list))
return;
clone_state state;
init_clone_state(&state, remap_table, false, true);
/* We use the same shader */
state.ns = src->impl->function->shader;
/* The control-flow code assumes that the list of cf_nodes always starts
* and ends with a block. We start by adding an empty block.
*/
nir_block *nblk = nir_block_create(state.ns);
nblk->cf_node.parent = parent;
exec_list_push_tail(&dst->list, &nblk->cf_node.node);
clone_cf_list(&state, &dst->list, &src->list);
fixup_phi_srcs(&state);
}
static nir_function_impl *
clone_function_impl(clone_state *state, const nir_function_impl *fi)
{
nir_function_impl *nfi = nir_function_impl_create_bare(state->ns);
clone_var_list(state, &nfi->locals, &fi->locals);
clone_reg_list(state, &nfi->registers, &fi->registers);
nfi->reg_alloc = fi->reg_alloc;
nfi->num_params = fi->num_params;
nfi->params = ralloc_array(state->ns, nir_variable *, fi->num_params);
for (unsigned i = 0; i < fi->num_params; i++) {
nfi->params[i] = clone_variable(state, fi->params[i]);
}
if (fi->return_var)
nfi->return_var = clone_variable(state, fi->return_var);
assert(list_empty(&state->phi_srcs));
clone_cf_list(state, &nfi->body, &fi->body);
fixup_phi_srcs(state);
/* All metadata is invalidated in the cloning process */
nfi->valid_metadata = 0;
return nfi;
}
nir_function_impl *
nir_function_impl_clone(const nir_function_impl *fi)
{
clone_state state;
init_clone_state(&state, NULL, false, false);
/* We use the same shader */
state.ns = fi->function->shader;
nir_function_impl *nfi = clone_function_impl(&state, fi);
free_clone_state(&state);
return nfi;
}
static nir_function *
clone_function(clone_state *state, const nir_function *fxn, nir_shader *ns)
{
assert(ns == state->ns);
nir_function *nfxn = nir_function_create(ns, fxn->name);
/* Needed for call instructions */
add_remap(state, nfxn, fxn);
nfxn->num_params = fxn->num_params;
nfxn->params = ralloc_array(state->ns, nir_parameter, fxn->num_params);
memcpy(nfxn->params, fxn->params, sizeof(nir_parameter) * fxn->num_params);
nfxn->return_type = fxn->return_type;
/* At first glance, it looks like we should clone the function_impl here.
* However, call instructions need to be able to reference at least the
* function and those will get processed as we clone the function_impls.
* We stop here and do function_impls as a second pass.
*/
return nfxn;
}
nir_shader *
nir_shader_clone(void *mem_ctx, const nir_shader *s)
{
clone_state state;
init_clone_state(&state, NULL, true, false);
nir_shader *ns = nir_shader_create(mem_ctx, s->stage, s->options, NULL);
state.ns = ns;
clone_var_list(&state, &ns->uniforms, &s->uniforms);
clone_var_list(&state, &ns->inputs, &s->inputs);
clone_var_list(&state, &ns->outputs, &s->outputs);
clone_var_list(&state, &ns->shared, &s->shared);
clone_var_list(&state, &ns->globals, &s->globals);
clone_var_list(&state, &ns->system_values, &s->system_values);
/* Go through and clone functions */
foreach_list_typed(nir_function, fxn, node, &s->functions)
clone_function(&state, fxn, ns);
/* Only after all functions are cloned can we clone the actual function
* implementations. This is because nir_call_instrs need to reference the
* functions of other functions and we don't know what order the functions
* will have in the list.
*/
nir_foreach_function(fxn, s) {
nir_function *nfxn = remap_global(&state, fxn);
nfxn->impl = clone_function_impl(&state, fxn->impl);
nfxn->impl->function = nfxn;
}
clone_reg_list(&state, &ns->registers, &s->registers);
ns->reg_alloc = s->reg_alloc;
ns->info = s->info;
ns->info.name = ralloc_strdup(ns, ns->info.name);
if (ns->info.label)
ns->info.label = ralloc_strdup(ns, ns->info.label);
ns->num_inputs = s->num_inputs;
ns->num_uniforms = s->num_uniforms;
ns->num_outputs = s->num_outputs;
ns->num_shared = s->num_shared;
free_clone_state(&state);
return ns;
}
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