--- /dev/null
+/*
+ * Copyright © 2015 Intel Corporation
+ *
+ * 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_builder.h"
+#include "nir_control_flow.h"
+
+struct inline_functions_state {
+ struct set *inlined;
+ nir_builder builder;
+ bool progress;
+};
+
+static bool inline_function_impl(nir_function_impl *impl, struct set *inlined);
+
+static bool
+rewrite_param_derefs_block(nir_block *block, void *void_state)
+{
+ nir_call_instr *call = void_state;
+
+ nir_foreach_instr_safe(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 (intrin->variables[i]->var->data.mode != nir_var_param)
+ continue;
+
+ int param_idx = intrin->variables[i]->var->data.location;
+
+ nir_deref_var *call_deref;
+ if (param_idx >= 0) {
+ assert(param_idx < call->callee->num_params);
+ call_deref = call->params[param_idx];
+ } else {
+ call_deref = call->return_deref;
+ }
+ assert(call_deref);
+
+ nir_deref_var *new_deref = nir_deref_as_var(nir_copy_deref(intrin, &call_deref->deref));
+ nir_deref *new_tail = nir_deref_tail(&new_deref->deref);
+ new_tail->child = intrin->variables[i]->deref.child;
+ ralloc_steal(new_tail, new_tail->child);
+ intrin->variables[i] = new_deref;
+ }
+ }
+
+ return true;
+}
+
+static void
+lower_param_to_local(nir_variable *param, nir_function_impl *impl, bool write)
+{
+ if (param->data.mode != nir_var_param)
+ return;
+
+ nir_parameter_type param_type;
+ if (param->data.location >= 0) {
+ assert(param->data.location < impl->num_params);
+ param_type = impl->function->params[param->data.location].param_type;
+ } else {
+ /* Return variable */
+ param_type = nir_parameter_out;
+ }
+
+ if ((write && param_type == nir_parameter_in) ||
+ (!write && param_type == nir_parameter_out)) {
+ /* In this case, we need a shadow copy. Turn it into a local */
+ param->data.mode = nir_var_local;
+ exec_list_push_tail(&impl->locals, ¶m->node);
+ }
+}
+
+static bool
+lower_params_to_locals_block(nir_block *block, void *void_state)
+{
+ nir_function_impl *impl = void_state;
+
+ nir_foreach_instr_safe(block, instr) {
+ if (instr->type != nir_instr_type_intrinsic)
+ continue;
+
+ nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
+
+ switch (intrin->intrinsic) {
+ case nir_intrinsic_store_var:
+ lower_param_to_local(intrin->variables[0]->var, impl, true);
+ break;
+
+ case nir_intrinsic_copy_var:
+ lower_param_to_local(intrin->variables[0]->var, impl, true);
+ lower_param_to_local(intrin->variables[1]->var, impl, false);
+ break;
+
+ case nir_intrinsic_load_var:
+ /* All other intrinsics which access variables (image_load_store)
+ * do so in a read-only fasion.
+ */
+ for (unsigned i = 0;
+ i < nir_intrinsic_infos[intrin->intrinsic].num_variables; i++) {
+ lower_param_to_local(intrin->variables[i]->var, impl, false);
+ }
+ break;
+
+ default:
+ continue;
+ }
+ }
+
+ return true;
+}
+
+static bool
+inline_functions_block(nir_block *block, void *void_state)
+{
+ struct inline_functions_state *state = void_state;
+
+ nir_builder *b = &state->builder;
+
+ /* This is tricky. We're iterating over instructions in a block but, as
+ * we go, the block and its instruction list are being split into
+ * pieces. However, this *should* be safe since foreach_safe always
+ * stashes the next thing in the iteration. That next thing will
+ * properly get moved to the next block when it gets split, and we
+ * continue iterating there.
+ */
+ nir_foreach_instr_safe(block, instr) {
+ if (instr->type != nir_instr_type_call)
+ continue;
+
+ state->progress = true;
+
+ nir_call_instr *call = nir_instr_as_call(instr);
+ assert(call->callee->impl);
+
+ inline_function_impl(call->callee->impl, state->inlined);
+
+ nir_function_impl *callee_copy =
+ nir_function_impl_clone(call->callee->impl);
+ callee_copy->function = call->callee;
+
+ /* Add copies of all in parameters */
+ assert(call->num_params == callee_copy->num_params);
+
+ exec_list_append(&b->impl->locals, &callee_copy->locals);
+ exec_list_append(&b->impl->registers, &callee_copy->registers);
+
+ b->cursor = nir_before_instr(&call->instr);
+
+ /* We now need to tie the two functions together using the
+ * parameters. There are two ways we do this: One is to turn the
+ * parameter into a local variable and do a shadow-copy. The other
+ * is to treat the parameter as a "proxy" and rewrite derefs to use
+ * the actual variable that comes from the call instruction. We
+ * implement both schemes. The first is needed in the case where we
+ * have an in parameter that we write or similar. The second case is
+ * needed for handling things such as images and uniforms properly.
+ */
+
+ /* Figure out when we need to lower to a shadow local */
+ nir_foreach_block(callee_copy, lower_params_to_locals_block, callee_copy);
+ for (unsigned i = 0; i < callee_copy->num_params; i++) {
+ nir_variable *param = callee_copy->params[i];
+
+ if (param->data.mode == nir_var_local &&
+ call->callee->params[i].param_type != nir_parameter_out) {
+ nir_copy_deref_var(b, nir_deref_var_create(b->shader, param),
+ call->params[i]);
+ }
+ }
+
+ nir_foreach_block(callee_copy, rewrite_param_derefs_block, call);
+
+ /* Pluck the body out of the function and place it here */
+ nir_cf_list body;
+ nir_cf_list_extract(&body, &callee_copy->body);
+ nir_cf_reinsert(&body, b->cursor);
+
+ b->cursor = nir_before_instr(&call->instr);
+
+ /* Add copies of all out parameters and the return */
+ assert(call->num_params == callee_copy->num_params);
+ for (unsigned i = 0; i < callee_copy->num_params; i++) {
+ nir_variable *param = callee_copy->params[i];
+
+ if (param->data.mode == nir_var_local &&
+ call->callee->params[i].param_type != nir_parameter_in) {
+ nir_copy_deref_var(b, call->params[i],
+ nir_deref_var_create(b->shader, param));
+ }
+ }
+ if (!glsl_type_is_void(call->callee->return_type) &&
+ callee_copy->return_var->data.mode == nir_var_local) {
+ nir_copy_deref_var(b, call->return_deref,
+ nir_deref_var_create(b->shader,
+ callee_copy->return_var));
+ }
+
+ nir_instr_remove(&call->instr);
+ }
+
+ return true;
+}
+
+static bool
+inline_function_impl(nir_function_impl *impl, struct set *inlined)
+{
+ if (_mesa_set_search(inlined, impl))
+ return false; /* Already inlined */
+
+ struct inline_functions_state state;
+
+ state.inlined = inlined;
+ state.progress = false;
+ nir_builder_init(&state.builder, impl);
+
+ nir_foreach_block(impl, inline_functions_block, &state);
+
+ if (state.progress) {
+ /* SSA and register indices are completely messed up now */
+ nir_index_ssa_defs(impl);
+ nir_index_local_regs(impl);
+
+ nir_metadata_preserve(impl, nir_metadata_none);
+ }
+
+ _mesa_set_add(inlined, impl);
+
+ return state.progress;
+}
+
+bool
+nir_inline_functions(nir_shader *shader)
+{
+ struct set *inlined = _mesa_set_create(NULL, _mesa_hash_pointer,
+ _mesa_key_pointer_equal);
+ bool progress = false;
+
+ nir_foreach_function(shader, function) {
+ if (function->impl)
+ progress = inline_function_impl(function->impl, inlined) || progress;
+ }
+
+ _mesa_set_destroy(inlined, NULL);
+
+ return progress;
+}
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