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16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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25 #include "nir_builder.h"
26 #include "nir_control_flow.h"
28 static bool inline_function_impl(nir_function_impl *impl, struct set *inlined);
31 rewrite_param_derefs_block(nir_block *block, nir_call_instr *call)
33 nir_foreach_instr_safe(instr, block) {
34 if (instr->type != nir_instr_type_intrinsic)
37 nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
40 i < nir_intrinsic_infos[intrin->intrinsic].num_variables; i++) {
41 if (intrin->variables[i]->var->data.mode != nir_var_param)
44 int param_idx = intrin->variables[i]->var->data.location;
46 nir_deref_var *call_deref;
48 assert(param_idx < call->callee->num_params);
49 call_deref = call->params[param_idx];
51 call_deref = call->return_deref;
55 nir_deref_var *new_deref = nir_deref_as_var(nir_copy_deref(intrin, &call_deref->deref));
56 nir_deref *new_tail = nir_deref_tail(&new_deref->deref);
57 new_tail->child = intrin->variables[i]->deref.child;
58 ralloc_steal(new_tail, new_tail->child);
59 intrin->variables[i] = new_deref;
67 lower_param_to_local(nir_variable *param, nir_function_impl *impl, bool write)
69 if (param->data.mode != nir_var_param)
72 nir_parameter_type param_type;
73 if (param->data.location >= 0) {
74 assert(param->data.location < impl->num_params);
75 param_type = impl->function->params[param->data.location].param_type;
78 param_type = nir_parameter_out;
81 if ((write && param_type == nir_parameter_in) ||
82 (!write && param_type == nir_parameter_out)) {
83 /* In this case, we need a shadow copy. Turn it into a local */
84 param->data.mode = nir_var_local;
85 exec_list_push_tail(&impl->locals, ¶m->node);
90 lower_params_to_locals_block(nir_block *block, nir_function_impl *impl)
92 nir_foreach_instr_safe(instr, block) {
93 if (instr->type != nir_instr_type_intrinsic)
96 nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
98 switch (intrin->intrinsic) {
99 case nir_intrinsic_store_var:
100 lower_param_to_local(intrin->variables[0]->var, impl, true);
103 case nir_intrinsic_copy_var:
104 lower_param_to_local(intrin->variables[0]->var, impl, true);
105 lower_param_to_local(intrin->variables[1]->var, impl, false);
108 case nir_intrinsic_load_var:
109 /* All other intrinsics which access variables (image_load_store)
110 * do so in a read-only fasion.
113 i < nir_intrinsic_infos[intrin->intrinsic].num_variables; i++) {
114 lower_param_to_local(intrin->variables[i]->var, impl, false);
127 inline_functions_block(nir_block *block, nir_builder *b,
130 bool progress = false;
131 /* This is tricky. We're iterating over instructions in a block but, as
132 * we go, the block and its instruction list are being split into
133 * pieces. However, this *should* be safe since foreach_safe always
134 * stashes the next thing in the iteration. That next thing will
135 * properly get moved to the next block when it gets split, and we
136 * continue iterating there.
138 nir_foreach_instr_safe(instr, block) {
139 if (instr->type != nir_instr_type_call)
144 nir_call_instr *call = nir_instr_as_call(instr);
145 assert(call->callee->impl);
147 inline_function_impl(call->callee->impl, inlined);
149 nir_function_impl *callee_copy =
150 nir_function_impl_clone(call->callee->impl);
151 callee_copy->function = call->callee;
153 /* Add copies of all in parameters */
154 assert(call->num_params == callee_copy->num_params);
156 exec_list_append(&b->impl->locals, &callee_copy->locals);
157 exec_list_append(&b->impl->registers, &callee_copy->registers);
159 b->cursor = nir_before_instr(&call->instr);
161 /* We now need to tie the two functions together using the
162 * parameters. There are two ways we do this: One is to turn the
163 * parameter into a local variable and do a shadow-copy. The other
164 * is to treat the parameter as a "proxy" and rewrite derefs to use
165 * the actual variable that comes from the call instruction. We
166 * implement both schemes. The first is needed in the case where we
167 * have an in parameter that we write or similar. The second case is
168 * needed for handling things such as images and uniforms properly.
171 /* Figure out when we need to lower to a shadow local */
172 nir_foreach_block(block, callee_copy) {
173 lower_params_to_locals_block(block, callee_copy);
176 for (unsigned i = 0; i < callee_copy->num_params; i++) {
177 nir_variable *param = callee_copy->params[i];
179 if (param->data.mode == nir_var_local &&
180 call->callee->params[i].param_type != nir_parameter_out) {
181 nir_copy_deref_var(b, nir_deref_var_create(b->shader, param),
186 nir_foreach_block(block, callee_copy) {
187 rewrite_param_derefs_block(block, call);
190 /* Pluck the body out of the function and place it here */
192 nir_cf_list_extract(&body, &callee_copy->body);
193 nir_cf_reinsert(&body, b->cursor);
195 b->cursor = nir_before_instr(&call->instr);
197 /* Add copies of all out parameters and the return */
198 assert(call->num_params == callee_copy->num_params);
199 for (unsigned i = 0; i < callee_copy->num_params; i++) {
200 nir_variable *param = callee_copy->params[i];
202 if (param->data.mode == nir_var_local &&
203 call->callee->params[i].param_type != nir_parameter_in) {
204 nir_copy_deref_var(b, call->params[i],
205 nir_deref_var_create(b->shader, param));
208 if (!glsl_type_is_void(call->callee->return_type) &&
209 callee_copy->return_var->data.mode == nir_var_local) {
210 nir_copy_deref_var(b, call->return_deref,
211 nir_deref_var_create(b->shader,
212 callee_copy->return_var));
215 nir_instr_remove(&call->instr);
222 inline_function_impl(nir_function_impl *impl, struct set *inlined)
224 if (_mesa_set_search(inlined, impl))
225 return false; /* Already inlined */
228 nir_builder_init(&b, impl);
230 bool progress = false;
231 nir_foreach_block_safe(block, impl) {
232 progress |= inline_functions_block(block, &b, inlined);
236 /* SSA and register indices are completely messed up now */
237 nir_index_ssa_defs(impl);
238 nir_index_local_regs(impl);
240 nir_metadata_preserve(impl, nir_metadata_none);
243 _mesa_set_add(inlined, impl);
249 nir_inline_functions(nir_shader *shader)
251 struct set *inlined = _mesa_set_create(NULL, _mesa_hash_pointer,
252 _mesa_key_pointer_equal);
253 bool progress = false;
255 nir_foreach_function(function, shader) {
257 progress = inline_function_impl(function->impl, inlined) || progress;
260 _mesa_set_destroy(inlined, NULL);