--- /dev/null
+/*
+ * Copyright © 2014 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.
+ *
+ * Authors:
+ * Connor Abbott (cwabbott0@gmail.com)
+ *
+ */
+
+#include "nir.h"
+#include <assert.h>
+
+nir_shader *
+nir_shader_create(void *mem_ctx)
+{
+ nir_shader *shader = ralloc(mem_ctx, nir_shader);
+
+ shader->uniforms = _mesa_hash_table_create(shader, _mesa_key_hash_string,
+ _mesa_key_string_equal);
+ shader->inputs = _mesa_hash_table_create(shader, _mesa_key_hash_string,
+ _mesa_key_string_equal);
+ shader->outputs = _mesa_hash_table_create(shader, _mesa_key_hash_string,
+ _mesa_key_string_equal);
+
+ shader->num_user_structures = 0;
+ shader->user_structures = NULL;
+
+ exec_list_make_empty(&shader->functions);
+ exec_list_make_empty(&shader->registers);
+ exec_list_make_empty(&shader->globals);
+ exec_list_make_empty(&shader->system_values);
+ shader->reg_alloc = 0;
+
+ return shader;
+}
+
+static nir_register *
+reg_create(void *mem_ctx, struct exec_list *list)
+{
+ nir_register *reg = ralloc(mem_ctx, nir_register);
+
+ reg->uses = _mesa_set_create(mem_ctx, _mesa_key_pointer_equal);
+ reg->defs = _mesa_set_create(mem_ctx, _mesa_key_pointer_equal);
+ reg->if_uses = _mesa_set_create(mem_ctx, _mesa_key_pointer_equal);
+
+ reg->num_components = 0;
+ reg->num_array_elems = 0;
+ reg->is_packed = false;
+ reg->name = NULL;
+
+ exec_list_push_tail(list, ®->node);
+
+ return reg;
+}
+
+nir_register *
+nir_global_reg_create(nir_shader *shader)
+{
+ nir_register *reg = reg_create(shader, &shader->registers);
+ reg->index = shader->reg_alloc++;
+ reg->is_global = true;
+
+ return reg;
+}
+
+nir_register *
+nir_local_reg_create(nir_function_impl *impl)
+{
+ nir_register *reg = reg_create(ralloc_parent(impl), &impl->registers);
+ reg->index = impl->reg_alloc++;
+ reg->is_global = false;
+
+ return reg;
+}
+
+void
+nir_reg_remove(nir_register *reg)
+{
+ exec_node_remove(®->node);
+}
+
+nir_function *
+nir_function_create(nir_shader *shader, const char *name)
+{
+ nir_function *func = ralloc(shader, nir_function);
+
+ exec_list_push_tail(&shader->functions, &func->node);
+ exec_list_make_empty(&func->overload_list);
+ func->name = name;
+
+ return func;
+}
+
+nir_function_overload *
+nir_function_overload_create(nir_function *func)
+{
+ void *mem_ctx = ralloc_parent(func);
+
+ nir_function_overload *overload = ralloc(mem_ctx, nir_function_overload);
+
+ overload->num_params = 0;
+ overload->params = NULL;
+ overload->return_type = glsl_void_type();
+
+ exec_list_push_tail(&func->overload_list, &overload->node);
+ overload->function = func;
+
+ return overload;
+}
+
+nir_src nir_src_copy(nir_src src, void *mem_ctx)
+{
+ nir_src ret;
+ ret.is_ssa = src.is_ssa;
+ if (ret.is_ssa) {
+ ret.ssa = src.ssa;
+ } else {
+ ret.reg.base_offset = src.reg.base_offset;
+ ret.reg.reg = src.reg.reg;
+ if (src.reg.indirect) {
+ ret.reg.indirect = ralloc(mem_ctx, nir_src);
+ *ret.reg.indirect = *src.reg.indirect;
+ } else {
+ ret.reg.indirect = NULL;
+ }
+ }
+
+ return ret;
+}
+
+nir_dest nir_dest_copy(nir_dest dest, void *mem_ctx)
+{
+ nir_dest ret;
+ ret.is_ssa = dest.is_ssa;
+ if (ret.is_ssa) {
+ ret.ssa = dest.ssa;
+ } else {
+ ret.reg.base_offset = dest.reg.base_offset;
+ ret.reg.reg = dest.reg.reg;
+ if (dest.reg.indirect) {
+ ret.reg.indirect = ralloc(mem_ctx, nir_src);
+ *ret.reg.indirect = *dest.reg.indirect;
+ } else {
+ ret.reg.indirect = NULL;
+ }
+ }
+
+ return ret;
+}
+
+static inline void
+block_add_pred(nir_block *block, nir_block *pred)
+{
+ _mesa_set_add(block->predecessors, _mesa_hash_pointer(pred), pred);
+}
+
+static void
+cf_init(nir_cf_node *node, nir_cf_node_type type)
+{
+ exec_node_init(&node->node);
+ node->parent = NULL;
+ node->type = type;
+}
+
+static void
+link_blocks(nir_block *pred, nir_block *succ1, nir_block *succ2)
+{
+ pred->successors[0] = succ1;
+ block_add_pred(succ1, pred);
+
+ pred->successors[1] = succ2;
+ if (succ2 != NULL)
+ block_add_pred(succ2, pred);
+}
+
+static void
+unlink_blocks(nir_block *pred, nir_block *succ)
+{
+ if (pred->successors[0] == succ) {
+ pred->successors[0] = pred->successors[1];
+ pred->successors[1] = NULL;
+ } else {
+ assert(pred->successors[1] == succ);
+ pred->successors[1] = NULL;
+ }
+
+ struct set_entry *entry = _mesa_set_search(succ->predecessors,
+ _mesa_hash_pointer(pred), pred);
+
+ assert(entry);
+
+ _mesa_set_remove(succ->predecessors, entry);
+}
+
+static void
+unlink_block_successors(nir_block *block)
+{
+ if (block->successors[0] != NULL)
+ unlink_blocks(block, block->successors[0]);
+ if (block->successors[1] != NULL)
+ unlink_blocks(block, block->successors[1]);
+}
+
+
+nir_function_impl *
+nir_function_impl_create(nir_function_overload *overload)
+{
+ assert(overload->impl == NULL);
+
+ void *mem_ctx = ralloc_parent(overload);
+
+ nir_function_impl *impl = ralloc(mem_ctx, nir_function_impl);
+
+ overload->impl = impl;
+ impl->overload = overload;
+
+ cf_init(&impl->cf_node, nir_cf_node_function);
+
+ exec_list_make_empty(&impl->body);
+ exec_list_make_empty(&impl->registers);
+ exec_list_make_empty(&impl->locals);
+ impl->num_params = 0;
+ impl->params = NULL;
+ impl->return_var = NULL;
+ impl->reg_alloc = 0;
+ impl->ssa_alloc = 0;
+ impl->block_index_dirty = true;
+
+ /* create start & end blocks */
+ nir_block *start_block = nir_block_create(mem_ctx);
+ nir_block *end_block = nir_block_create(mem_ctx);
+ start_block->cf_node.parent = &impl->cf_node;
+ end_block->cf_node.parent = &impl->cf_node;
+ impl->start_block = start_block;
+ impl->end_block = end_block;
+
+ exec_list_push_tail(&impl->body, &start_block->cf_node.node);
+
+ start_block->successors[0] = end_block;
+ block_add_pred(end_block, start_block);
+
+ return impl;
+}
+
+nir_block *
+nir_block_create(void *mem_ctx)
+{
+ nir_block *block = ralloc(mem_ctx, nir_block);
+
+ cf_init(&block->cf_node, nir_cf_node_block);
+
+ block->successors[0] = block->successors[1] = NULL;
+ block->predecessors = _mesa_set_create(mem_ctx, _mesa_key_pointer_equal);
+
+ exec_list_make_empty(&block->instr_list);
+
+ return block;
+}
+
+static inline void
+src_init(nir_src *src)
+{
+ src->is_ssa = false;
+ src->reg.reg = NULL;
+ src->reg.indirect = NULL;
+ src->reg.base_offset = 0;
+}
+
+nir_if *
+nir_if_create(void *mem_ctx)
+{
+ nir_if *if_stmt = ralloc(mem_ctx, nir_if);
+
+ cf_init(&if_stmt->cf_node, nir_cf_node_if);
+ src_init(&if_stmt->condition);
+
+ nir_block *then = nir_block_create(mem_ctx);
+ exec_list_make_empty(&if_stmt->then_list);
+ exec_list_push_tail(&if_stmt->then_list, &then->cf_node.node);
+ then->cf_node.parent = &if_stmt->cf_node;
+
+ nir_block *else_stmt = nir_block_create(mem_ctx);
+ exec_list_make_empty(&if_stmt->else_list);
+ exec_list_push_tail(&if_stmt->else_list, &else_stmt->cf_node.node);
+ else_stmt->cf_node.parent = &if_stmt->cf_node;
+
+ return if_stmt;
+}
+
+nir_loop *
+nir_loop_create(void *mem_ctx)
+{
+ nir_loop *loop = ralloc(mem_ctx, nir_loop);
+
+ cf_init(&loop->cf_node, nir_cf_node_loop);
+
+ nir_block *body = nir_block_create(mem_ctx);
+ exec_list_make_empty(&loop->body);
+ exec_list_push_tail(&loop->body, &body->cf_node.node);
+ body->cf_node.parent = &loop->cf_node;
+
+ body->successors[0] = body;
+ block_add_pred(body, body);
+
+ return loop;
+}
+
+static void
+instr_init(nir_instr *instr, nir_instr_type type)
+{
+ instr->type = type;
+ instr->block = NULL;
+ exec_node_init(&instr->node);
+}
+
+static void
+dest_init(nir_dest *dest)
+{
+ dest->is_ssa = false;
+ dest->reg.reg = NULL;
+ dest->reg.indirect = NULL;
+ dest->reg.base_offset = 0;
+}
+
+static void
+alu_dest_init(nir_alu_dest *dest)
+{
+ dest_init(&dest->dest);
+ dest->saturate = false;
+ dest->write_mask = 0xf;
+}
+
+static void
+alu_src_init(nir_alu_src *src)
+{
+ src_init(&src->src);
+ src->abs = src->negate = false;
+ src->swizzle[0] = 0;
+ src->swizzle[1] = 1;
+ src->swizzle[2] = 2;
+ src->swizzle[3] = 3;
+}
+
+nir_alu_instr *
+nir_alu_instr_create(void *mem_ctx, nir_op op)
+{
+ unsigned num_srcs = nir_op_infos[op].num_inputs;
+ nir_alu_instr *instr =
+ ralloc_size(mem_ctx,
+ sizeof(nir_alu_instr) + num_srcs * sizeof(nir_alu_src));
+
+ instr_init(&instr->instr, nir_instr_type_alu);
+ instr->op = op;
+ alu_dest_init(&instr->dest);
+ for (unsigned i = 0; i < num_srcs; i++)
+ alu_src_init(&instr->src[i]);
+
+ instr->has_predicate = false;
+ src_init(&instr->predicate);
+
+ return instr;
+}
+
+nir_jump_instr *
+nir_jump_instr_create(void *mem_ctx, nir_jump_type type)
+{
+ nir_jump_instr *instr = ralloc(mem_ctx, nir_jump_instr);
+ instr_init(&instr->instr, nir_instr_type_jump);
+ instr->type = type;
+ return instr;
+}
+
+nir_load_const_instr *
+nir_load_const_instr_create(void *mem_ctx)
+{
+ nir_load_const_instr *instr = ralloc(mem_ctx, nir_load_const_instr);
+ instr_init(&instr->instr, nir_instr_type_load_const);
+
+ dest_init(&instr->dest);
+ instr->num_components = 0;
+ instr->array_elems = 0;
+
+ instr->has_predicate = false;
+ src_init(&instr->predicate);
+
+ return instr;
+}
+
+nir_intrinsic_instr *
+nir_intrinsic_instr_create(void *mem_ctx, nir_intrinsic_op op)
+{
+ unsigned num_srcs = nir_intrinsic_infos[op].num_srcs;
+ nir_intrinsic_instr *instr =
+ ralloc_size(mem_ctx,
+ sizeof(nir_intrinsic_instr) + num_srcs * sizeof(nir_src));
+
+ instr_init(&instr->instr, nir_instr_type_intrinsic);
+ instr->intrinsic = op;
+
+ if (nir_intrinsic_infos[op].has_dest)
+ dest_init(&instr->dest);
+
+ for (unsigned i = 0; i < num_srcs; i++)
+ src_init(&instr->src[i]);
+
+ instr->has_predicate = false;
+ src_init(&instr->predicate);
+
+ return instr;
+}
+
+nir_call_instr *
+nir_call_instr_create(void *mem_ctx, nir_function_overload *callee)
+{
+ nir_call_instr *instr = ralloc(mem_ctx, nir_call_instr);
+ instr_init(&instr->instr, nir_instr_type_call);
+
+ instr->callee = callee;
+ instr->num_params = callee->num_params;
+ instr->params = ralloc_array(mem_ctx, nir_deref_var *, instr->num_params);
+ instr->return_deref = NULL;
+
+ instr->has_predicate = false;
+ src_init(&instr->predicate);
+
+ return instr;
+}
+
+nir_tex_instr *
+nir_tex_instr_create(void *mem_ctx, unsigned num_srcs)
+{
+ nir_tex_instr *instr = ralloc(mem_ctx, nir_tex_instr);
+ instr_init(&instr->instr, nir_instr_type_texture);
+
+ instr->num_srcs = num_srcs;
+ for (unsigned i = 0; i < num_srcs; i++)
+ src_init(&instr->src[i]);
+
+ instr->has_predicate = false;
+ src_init(&instr->predicate);
+
+ return instr;
+}
+
+nir_phi_instr *
+nir_phi_instr_create(void *mem_ctx)
+{
+ nir_phi_instr *instr = ralloc(mem_ctx, nir_phi_instr);
+ instr_init(&instr->instr, nir_instr_type_phi);
+
+ dest_init(&instr->dest);
+ exec_list_make_empty(&instr->srcs);
+ return instr;
+}
+
+nir_ssa_undef_instr *
+nir_ssa_undef_instr_create(void *mem_ctx)
+{
+ nir_ssa_undef_instr *instr = ralloc(mem_ctx, nir_ssa_undef_instr);
+ instr_init(&instr->instr, nir_instr_type_ssa_undef);
+
+ instr->def.name = NULL;
+ instr->def.parent_instr = &instr->instr;
+
+ return instr;
+}
+
+nir_deref_var *
+nir_deref_var_create(void *mem_ctx, nir_variable *var)
+{
+ nir_deref_var *deref = ralloc(mem_ctx, nir_deref_var);
+ deref->deref.deref_type = nir_deref_type_var;
+ deref->deref.child = NULL;
+ deref->deref.type = var->type;
+ deref->var = var;
+ return deref;
+}
+
+nir_deref_array *
+nir_deref_array_create(void *mem_ctx)
+{
+ nir_deref_array *deref = ralloc(mem_ctx, nir_deref_array);
+ deref->deref.deref_type = nir_deref_type_array;
+ deref->deref.child = NULL;
+ deref->has_indirect = false;
+ src_init(&deref->indirect);
+ deref->base_offset = 0;
+ return deref;
+}
+
+nir_deref_struct *
+nir_deref_struct_create(void *mem_ctx, const char *field)
+{
+ nir_deref_struct *deref = ralloc(mem_ctx, nir_deref_struct);
+ deref->deref.deref_type = nir_deref_type_struct;
+ deref->deref.child = NULL;
+ deref->elem = ralloc_strdup(deref, field);
+ return deref;
+}
+
+static nir_deref_var *
+copy_deref_var(void *mem_ctx, nir_deref_var *deref)
+{
+ nir_deref_var *ret = nir_deref_var_create(mem_ctx, deref->var);
+ if (deref->deref.child)
+ ret->deref.child = nir_copy_deref(mem_ctx, deref->deref.child);
+ return ret;
+}
+
+static nir_deref_array *
+copy_deref_array(void *mem_ctx, nir_deref_array *deref)
+{
+ nir_deref_array *ret = nir_deref_array_create(mem_ctx);
+ ret->base_offset = deref->base_offset;
+ if (deref->has_indirect)
+ ret->indirect = deref->indirect;
+ ret->deref.type = deref->deref.type;
+ if (deref->deref.child)
+ ret->deref.child = nir_copy_deref(mem_ctx, deref->deref.child);
+ return ret;
+}
+
+static nir_deref_struct *
+copy_deref_struct(void *mem_ctx, nir_deref_struct *deref)
+{
+ nir_deref_struct *ret = nir_deref_struct_create(mem_ctx, deref->elem);
+ ret->deref.type = deref->deref.type;
+ if (deref->deref.child)
+ ret->deref.child = nir_copy_deref(mem_ctx, deref->deref.child);
+ return ret;
+}
+
+nir_deref *
+nir_copy_deref(void *mem_ctx, nir_deref *deref)
+{
+ switch (deref->deref_type) {
+ case nir_deref_type_var:
+ return ©_deref_var(mem_ctx, nir_deref_as_var(deref))->deref;
+ case nir_deref_type_array:
+ return ©_deref_array(mem_ctx, nir_deref_as_array(deref))->deref;
+ case nir_deref_type_struct:
+ return ©_deref_struct(mem_ctx, nir_deref_as_struct(deref))->deref;
+ default:
+ unreachable("Invalid dereference type");
+ }
+
+ return NULL;
+}
+
+
+/**
+ * \name Control flow modification
+ *
+ * These functions modify the control flow tree while keeping the control flow
+ * graph up-to-date. The invariants respected are:
+ * 1. Each then statement, else statement, or loop body must have at least one
+ * control flow node.
+ * 2. Each if-statement and loop must have one basic block before it and one
+ * after.
+ * 3. Two basic blocks cannot be directly next to each other.
+ * 4. If a basic block has a jump instruction, there must be only one and it
+ * must be at the end of the block.
+ * 5. The CFG must always be connected - this means that we must insert a fake
+ * CFG edge for loops with no break statement.
+ *
+ * The purpose of the second one is so that we have places to insert code during
+ * GCM, as well as eliminating the possibility of critical edges.
+ */
+/*@{*/
+
+static void
+link_non_block_to_block(nir_cf_node *node, nir_block *block)
+{
+ if (node->type == nir_cf_node_if) {
+ /*
+ * We're trying to link an if to a block after it; this just means linking
+ * the last block of the then and else branches.
+ */
+
+ nir_if *if_stmt = nir_cf_node_as_if(node);
+
+ nir_cf_node *last_then = nir_if_last_then_node(if_stmt);
+ assert(last_then->type == nir_cf_node_block);
+ nir_block *last_then_block = nir_cf_node_as_block(last_then);
+
+ nir_cf_node *last_else = nir_if_last_else_node(if_stmt);
+ assert(last_else->type == nir_cf_node_block);
+ nir_block *last_else_block = nir_cf_node_as_block(last_else);
+
+ if (exec_list_is_empty(&last_then_block->instr_list) ||
+ nir_block_last_instr(last_then_block)->type != nir_instr_type_jump) {
+ unlink_block_successors(last_then_block);
+ link_blocks(last_then_block, block, NULL);
+ }
+
+ if (exec_list_is_empty(&last_else_block->instr_list) ||
+ nir_block_last_instr(last_else_block)->type != nir_instr_type_jump) {
+ unlink_block_successors(last_else_block);
+ link_blocks(last_else_block, block, NULL);
+ }
+ } else {
+ assert(node->type == nir_cf_node_loop);
+
+ /*
+ * We can only get to this codepath if we're inserting a new loop, or
+ * at least a loop with no break statements; we can't insert break
+ * statements into a loop when we haven't inserted it into the CFG
+ * because we wouldn't know which block comes after the loop
+ * and therefore, which block should be the successor of the block with
+ * the break). Therefore, we need to insert a fake edge (see invariant
+ * #5).
+ */
+
+ nir_loop *loop = nir_cf_node_as_loop(node);
+
+ nir_cf_node *last = nir_loop_last_cf_node(loop);
+ assert(last->type == nir_cf_node_block);
+ nir_block *last_block = nir_cf_node_as_block(last);
+
+ last_block->successors[1] = block;
+ block_add_pred(block, last_block);
+ }
+}
+
+static void
+link_block_to_non_block(nir_block *block, nir_cf_node *node)
+{
+ if (node->type == nir_cf_node_if) {
+ /*
+ * We're trying to link a block to an if after it; this just means linking
+ * the block to the first block of the then and else branches.
+ */
+
+ nir_if *if_stmt = nir_cf_node_as_if(node);
+
+ nir_cf_node *first_then = nir_if_first_then_node(if_stmt);
+ assert(first_then->type == nir_cf_node_block);
+ nir_block *first_then_block = nir_cf_node_as_block(first_then);
+
+ nir_cf_node *first_else = nir_if_first_else_node(if_stmt);
+ assert(first_else->type == nir_cf_node_block);
+ nir_block *first_else_block = nir_cf_node_as_block(first_else);
+
+ unlink_block_successors(block);
+ link_blocks(block, first_then_block, first_else_block);
+ } else {
+ /*
+ * For similar reasons as the corresponding case in
+ * link_non_block_to_block(), don't worry about if the loop header has
+ * any predecessors that need to be unlinked.
+ */
+
+ assert(node->type == nir_cf_node_loop);
+
+ nir_loop *loop = nir_cf_node_as_loop(node);
+
+ nir_cf_node *loop_header = nir_loop_first_cf_node(loop);
+ assert(loop_header->type == nir_cf_node_block);
+ nir_block *loop_header_block = nir_cf_node_as_block(loop_header);
+
+ unlink_block_successors(block);
+ link_blocks(block, loop_header_block, NULL);
+ }
+
+}
+
+/**
+ * Takes a basic block and inserts a new empty basic block before it, making its
+ * predecessors point to the new block. This essentially splits the block into
+ * an empty header and a body so that another non-block CF node can be inserted
+ * between the two. Note that this does *not* link the two basic blocks, so
+ * some kind of cleanup *must* be performed after this call.
+ */
+
+static nir_block *
+split_block_beginning(nir_block *block)
+{
+ nir_block *new_block = nir_block_create(ralloc_parent(block));
+ new_block->cf_node.parent = block->cf_node.parent;
+ exec_node_insert_node_before(&block->cf_node.node, &new_block->cf_node.node);
+
+ struct set_entry *entry;
+ set_foreach(block->predecessors, entry) {
+ nir_block *pred = (nir_block *) entry->key;
+
+ unlink_blocks(pred, block);
+ link_blocks(pred, new_block, NULL);
+ }
+
+ return new_block;
+}
+
+/**
+ * Moves the successors of source to the successors of dest, leaving both
+ * successors of source NULL.
+ */
+
+static void
+move_successors(nir_block *source, nir_block *dest)
+{
+ nir_block *succ1 = source->successors[0];
+ if (succ1)
+ unlink_blocks(source, succ1);
+
+ nir_block *succ2 = source->successors[1];
+ if (succ2)
+ unlink_blocks(source, succ2);
+
+ unlink_block_successors(dest);
+ link_blocks(dest, succ1, succ2);
+}
+
+static nir_block *
+split_block_end(nir_block *block)
+{
+ nir_block *new_block = nir_block_create(ralloc_parent(block));
+ new_block->cf_node.parent = block->cf_node.parent;
+ exec_node_insert_after(&block->cf_node.node, &new_block->cf_node.node);
+
+ move_successors(block, new_block);
+
+ return new_block;
+}
+
+/**
+ * Inserts a non-basic block between two basic blocks and links them together.
+ */
+
+static void
+insert_non_block(nir_block *before, nir_cf_node *node, nir_block *after)
+{
+ node->parent = before->cf_node.parent;
+ exec_node_insert_after(&before->cf_node.node, &node->node);
+ link_block_to_non_block(before, node);
+ link_non_block_to_block(node, after);
+}
+
+/**
+ * Inserts a non-basic block before a basic block.
+ */
+
+static void
+insert_non_block_before_block(nir_cf_node *node, nir_block *block)
+{
+ /* split off the beginning of block into new_block */
+ nir_block *new_block = split_block_beginning(block);
+
+ /* insert our node in between new_block and block */
+ insert_non_block(new_block, node, block);
+}
+
+static void
+insert_non_block_after_block(nir_block *block, nir_cf_node *node)
+{
+ /* split off the end of block into new_block */
+ nir_block *new_block = split_block_end(block);
+
+ /* insert our node in between block and new_block */
+ insert_non_block(block, node, new_block);
+}
+
+/* walk up the control flow tree to find the innermost enclosed loop */
+static nir_loop *
+nearest_loop(nir_cf_node *node)
+{
+ while (node->type != nir_cf_node_loop) {
+ node = node->parent;
+ }
+
+ return nir_cf_node_as_loop(node);
+}
+
+nir_function_impl *
+nir_cf_node_get_function(nir_cf_node *node)
+{
+ while (node->type != nir_cf_node_function) {
+ node = node->parent;
+ }
+
+ return nir_cf_node_as_function(node);
+}
+
+/*
+ * update the CFG after a jump instruction has been added to the end of a block
+ */
+
+static void
+handle_jump(nir_block *block)
+{
+ nir_instr *instr = nir_block_last_instr(block);
+ nir_jump_instr *jump_instr = nir_instr_as_jump(instr);
+
+ unlink_block_successors(block);
+
+ if (jump_instr->type == nir_jump_break ||
+ jump_instr->type == nir_jump_continue) {
+ nir_loop *loop = nearest_loop(&block->cf_node);
+
+ if (jump_instr->type == nir_jump_continue) {
+ nir_cf_node *first_node = nir_loop_first_cf_node(loop);
+ assert(first_node->type == nir_cf_node_block);
+ nir_block *first_block = nir_cf_node_as_block(first_node);
+ link_blocks(block, first_block, NULL);
+ } else {
+ nir_cf_node *after = nir_cf_node_next(&loop->cf_node);
+ assert(after->type == nir_cf_node_block);
+ nir_block *after_block = nir_cf_node_as_block(after);
+ link_blocks(block, after_block, NULL);
+
+ /* If we inserted a fake link, remove it */
+ nir_cf_node *last = nir_loop_last_cf_node(loop);
+ assert(last->type == nir_cf_node_block);
+ nir_block *last_block = nir_cf_node_as_block(last);
+ if (last_block->successors[1] != NULL)
+ unlink_blocks(last_block, after_block);
+ }
+ } else {
+ nir_function_impl *impl = nir_cf_node_get_function(&block->cf_node);
+ link_blocks(block, impl->end_block, NULL);
+ }
+}
+
+static void
+handle_remove_jump(nir_block *block, nir_jump_type type)
+{
+ unlink_block_successors(block);
+
+ if (exec_node_is_tail_sentinel(block->cf_node.node.next)) {
+ nir_cf_node *parent = block->cf_node.parent;
+ if (parent->type == nir_cf_node_if) {
+ nir_cf_node *next = nir_cf_node_next(parent);
+ assert(next->type == nir_cf_node_block);
+ nir_block *next_block = nir_cf_node_as_block(next);
+
+ link_blocks(block, next_block, NULL);
+ } else {
+ assert(parent->type == nir_cf_node_loop);
+ nir_loop *loop = nir_cf_node_as_loop(parent);
+
+ nir_cf_node *head = nir_loop_first_cf_node(loop);
+ assert(head->type == nir_cf_node_block);
+ nir_block *head_block = nir_cf_node_as_block(head);
+
+ link_blocks(block, head_block, NULL);
+ }
+ } else {
+ nir_cf_node *next = nir_cf_node_next(&block->cf_node);
+ if (next->type == nir_cf_node_if) {
+ nir_if *next_if = nir_cf_node_as_if(next);
+
+ nir_cf_node *first_then = nir_if_first_then_node(next_if);
+ assert(first_then->type == nir_cf_node_block);
+ nir_block *first_then_block = nir_cf_node_as_block(first_then);
+
+ nir_cf_node *first_else = nir_if_first_else_node(next_if);
+ assert(first_else->type == nir_cf_node_block);
+ nir_block *first_else_block = nir_cf_node_as_block(first_else);
+
+ link_blocks(block, first_then_block, first_else_block);
+ } else {
+ assert(next->type == nir_cf_node_loop);
+ nir_loop *next_loop = nir_cf_node_as_loop(next);
+
+ nir_cf_node *first = nir_loop_first_cf_node(next_loop);
+ assert(first->type == nir_cf_node_block);
+ nir_block *first_block = nir_cf_node_as_block(first);
+
+ link_blocks(block, first_block, NULL);
+ }
+ }
+
+ if (type == nir_jump_break) {
+ nir_loop *loop = nearest_loop(&block->cf_node);
+
+ nir_cf_node *next = nir_cf_node_next(&loop->cf_node);
+ assert(next->type == nir_cf_node_block);
+ nir_block *next_block = nir_cf_node_as_block(next);
+
+ if (next_block->predecessors->entries == 0) {
+ /* insert fake link */
+ nir_cf_node *last = nir_loop_last_cf_node(loop);
+ assert(last->type == nir_cf_node_block);
+ nir_block *last_block = nir_cf_node_as_block(last);
+
+ last_block->successors[1] = next_block;
+ block_add_pred(next_block, last_block);
+ }
+ }
+}
+
+/**
+ * Inserts a basic block before another by merging the instructions.
+ *
+ * @param block the target of the insertion
+ * @param before the block to be inserted - must not have been inserted before
+ * @param has_jump whether \before has a jump instruction at the end
+ */
+
+static void
+insert_block_before_block(nir_block *block, nir_block *before, bool has_jump)
+{
+ assert(!has_jump || exec_list_is_empty(&block->instr_list));
+
+ foreach_list_typed(nir_instr, instr, node, &before->instr_list) {
+ instr->block = block;
+ }
+
+ exec_list_prepend(&block->instr_list, &before->instr_list);
+
+ if (has_jump)
+ handle_jump(block);
+}
+
+/**
+ * Inserts a basic block after another by merging the instructions.
+ *
+ * @param block the target of the insertion
+ * @param after the block to be inserted - must not have been inserted before
+ * @param has_jump whether \after has a jump instruction at the end
+ */
+
+static void
+insert_block_after_block(nir_block *block, nir_block *after, bool has_jump)
+{
+ foreach_list_typed(nir_instr, instr, node, &after->instr_list) {
+ instr->block = block;
+ }
+
+ exec_list_append(&block->instr_list, &after->instr_list);
+
+ if (has_jump)
+ handle_jump(block);
+}
+
+static void
+update_if_uses(nir_cf_node *node)
+{
+ if (node->type != nir_cf_node_if)
+ return;
+
+ nir_if *if_stmt = nir_cf_node_as_if(node);
+ if (if_stmt->condition.is_ssa)
+ return;
+
+ nir_register *reg = if_stmt->condition.reg.reg;
+ assert(reg != NULL);
+
+ _mesa_set_add(reg->if_uses, _mesa_hash_pointer(if_stmt), if_stmt);
+}
+
+void
+nir_cf_node_insert_after(nir_cf_node *node, nir_cf_node *after)
+{
+ update_if_uses(after);
+
+ if (after->type == nir_cf_node_block) {
+ /*
+ * either node or the one after it must be a basic block, by invariant #2;
+ * in either case, just merge the blocks together.
+ */
+ nir_block *after_block = nir_cf_node_as_block(after);
+
+ bool has_jump = !exec_list_is_empty(&after_block->instr_list) &&
+ nir_block_last_instr(after_block)->type == nir_instr_type_jump;
+
+ if (node->type == nir_cf_node_block) {
+ insert_block_after_block(nir_cf_node_as_block(node), after_block,
+ has_jump);
+ } else {
+ nir_cf_node *next = nir_cf_node_next(node);
+ assert(next->type == nir_cf_node_block);
+ nir_block *next_block = nir_cf_node_as_block(next);
+
+ insert_block_before_block(next_block, after_block, has_jump);
+ }
+ } else {
+ if (node->type == nir_cf_node_block) {
+ insert_non_block_after_block(nir_cf_node_as_block(node), after);
+ } else {
+ /*
+ * We have to insert a non-basic block after a non-basic block. Since
+ * every non-basic block has a basic block after it, this is equivalent
+ * to inserting a non-basic block before a basic block.
+ */
+
+ nir_cf_node *next = nir_cf_node_next(node);
+ assert(next->type == nir_cf_node_block);
+ nir_block *next_block = nir_cf_node_as_block(next);
+
+ insert_non_block_before_block(after, next_block);
+ }
+ }
+
+ nir_function_impl *impl = nir_cf_node_get_function(node);
+ impl->block_index_dirty = true;
+}
+
+void
+nir_cf_node_insert_before(nir_cf_node *node, nir_cf_node *before)
+{
+ update_if_uses(before);
+
+ if (before->type == nir_cf_node_block) {
+ nir_block *before_block = nir_cf_node_as_block(before);
+
+ bool has_jump = !exec_list_is_empty(&before_block->instr_list) &&
+ nir_block_last_instr(before_block)->type == nir_instr_type_jump;
+
+ if (node->type == nir_cf_node_block) {
+ insert_block_before_block(nir_cf_node_as_block(node), before_block,
+ has_jump);
+ } else {
+ nir_cf_node *prev = nir_cf_node_prev(node);
+ assert(prev->type == nir_cf_node_block);
+ nir_block *prev_block = nir_cf_node_as_block(prev);
+
+ insert_block_after_block(prev_block, before_block, has_jump);
+ }
+ } else {
+ if (node->type == nir_cf_node_block) {
+ insert_non_block_before_block(before, nir_cf_node_as_block(node));
+ } else {
+ /*
+ * We have to insert a non-basic block before a non-basic block. This
+ * is equivalent to inserting a non-basic block after a basic block.
+ */
+
+ nir_cf_node *prev_node = nir_cf_node_prev(node);
+ assert(prev_node->type == nir_cf_node_block);
+ nir_block *prev_block = nir_cf_node_as_block(prev_node);
+
+ insert_non_block_after_block(prev_block, before);
+ }
+ }
+
+ nir_function_impl *impl = nir_cf_node_get_function(node);
+ impl->block_index_dirty = true;
+}
+
+void
+nir_cf_node_insert_begin(struct exec_list *list, nir_cf_node *node)
+{
+ nir_cf_node *begin = exec_node_data(nir_cf_node, list->head, node);
+ nir_cf_node_insert_before(begin, node);
+}
+
+void
+nir_cf_node_insert_end(struct exec_list *list, nir_cf_node *node)
+{
+ nir_cf_node *end = exec_node_data(nir_cf_node, list->tail_pred, node);
+ nir_cf_node_insert_after(end, node);
+}
+
+/**
+ * Stitch two basic blocks together into one. The aggregate must have the same
+ * predecessors as the first and the same successors as the second.
+ */
+
+static void
+stitch_blocks(nir_block *before, nir_block *after)
+{
+ /*
+ * We move after into before, so we have to deal with up to 2 successors vs.
+ * possibly a large number of predecessors.
+ *
+ * TODO: special case when before is empty and after isn't?
+ */
+
+ move_successors(after, before);
+
+ foreach_list_typed(nir_instr, instr, node, &after->instr_list) {
+ instr->block = before;
+ }
+
+ exec_list_append(&before->instr_list, &after->instr_list);
+ exec_node_remove(&after->cf_node.node);
+}
+
+void
+nir_cf_node_remove(nir_cf_node *node)
+{
+ nir_function_impl *impl = nir_cf_node_get_function(node);
+ impl->block_index_dirty = true;
+
+ if (node->type == nir_cf_node_block) {
+ /*
+ * Basic blocks can't really be removed by themselves, since they act as
+ * padding between the non-basic blocks. So all we do here is empty the
+ * block of instructions.
+ *
+ * TODO: could we assert here?
+ */
+ exec_list_make_empty(&nir_cf_node_as_block(node)->instr_list);
+ } else {
+ nir_cf_node *before = nir_cf_node_prev(node);
+ assert(before->type == nir_cf_node_block);
+ nir_block *before_block = nir_cf_node_as_block(before);
+
+ nir_cf_node *after = nir_cf_node_next(node);
+ assert(after->type == nir_cf_node_block);
+ nir_block *after_block = nir_cf_node_as_block(after);
+
+ exec_node_remove(&node->node);
+ stitch_blocks(before_block, after_block);
+ }
+}
+
+static bool
+add_use_cb(nir_src *src, void *state)
+{
+ nir_instr *instr = (nir_instr *) state;
+
+ if (src->is_ssa)
+ return true;
+
+ nir_register *reg = src->reg.reg;
+
+ _mesa_set_add(reg->uses, _mesa_hash_pointer(instr), instr);
+
+ return true;
+}
+
+static bool
+add_def_cb(nir_dest *dest, void *state)
+{
+ nir_instr *instr = (nir_instr *) state;
+
+ if (dest->is_ssa)
+ return true;
+
+ nir_register *reg = dest->reg.reg;
+
+ _mesa_set_add(reg->defs, _mesa_hash_pointer(instr), instr);
+
+ return true;
+}
+
+static void
+add_defs_uses(nir_instr *instr)
+{
+ nir_foreach_src(instr, add_use_cb, instr);
+ nir_foreach_dest(instr, add_def_cb, instr);
+}
+
+void
+nir_instr_insert_before(nir_instr *instr, nir_instr *before)
+{
+ assert(before->type != nir_instr_type_jump);
+ before->block = instr->block;
+ add_defs_uses(before);
+ exec_node_insert_node_before(&instr->node, &before->node);
+}
+
+void
+nir_instr_insert_after(nir_instr *instr, nir_instr *after)
+{
+ if (after->type == nir_instr_type_jump) {
+ assert(instr == nir_block_last_instr(instr->block));
+ assert(instr->type != nir_instr_type_jump);
+ }
+
+ after->block = instr->block;
+ add_defs_uses(after);
+ exec_node_insert_after(&instr->node, &after->node);
+
+ if (after->type == nir_instr_type_jump)
+ handle_jump(after->block);
+}
+
+void
+nir_instr_insert_before_block(nir_block *block, nir_instr *before)
+{
+ if (before->type == nir_instr_type_jump)
+ assert(exec_list_is_empty(&block->instr_list));
+
+ before->block = block;
+ add_defs_uses(before);
+ exec_list_push_head(&block->instr_list, &before->node);
+
+ if (before->type == nir_instr_type_jump)
+ handle_jump(block);
+}
+
+void
+nir_instr_insert_after_block(nir_block *block, nir_instr *after)
+{
+ if (after->type == nir_instr_type_jump) {
+ assert(exec_list_is_empty(&block->instr_list) ||
+ nir_block_last_instr(block)->type != nir_instr_type_jump);
+ }
+
+ after->block = block;
+ add_defs_uses(after);
+ exec_list_push_tail(&block->instr_list, &after->node);
+
+ if (after->type == nir_instr_type_jump)
+ handle_jump(block);
+}
+
+void
+nir_instr_insert_before_cf(nir_cf_node *node, nir_instr *before)
+{
+ if (node->type == nir_cf_node_block) {
+ nir_instr_insert_before_block(nir_cf_node_as_block(node), before);
+ } else {
+ nir_cf_node *prev = nir_cf_node_prev(node);
+ assert(prev->type == nir_cf_node_block);
+ nir_block *prev_block = nir_cf_node_as_block(prev);
+
+ nir_instr_insert_before_block(prev_block, before);
+ }
+}
+
+void
+nir_instr_insert_after_cf(nir_cf_node *node, nir_instr *after)
+{
+ if (node->type == nir_cf_node_block) {
+ nir_instr_insert_after_block(nir_cf_node_as_block(node), after);
+ } else {
+ nir_cf_node *next = nir_cf_node_next(node);
+ assert(next->type == nir_cf_node_block);
+ nir_block *next_block = nir_cf_node_as_block(next);
+
+ nir_instr_insert_before_block(next_block, after);
+ }
+}
+
+void
+nir_instr_insert_before_cf_list(struct exec_list *list, nir_instr *before)
+{
+ nir_cf_node *first_node = exec_node_data(nir_cf_node,
+ exec_list_get_head(list), node);
+ nir_instr_insert_before_cf(first_node, before);
+}
+
+void
+nir_instr_insert_after_cf_list(struct exec_list *list, nir_instr *after)
+{
+ nir_cf_node *last_node = exec_node_data(nir_cf_node,
+ exec_list_get_tail(list), node);
+ nir_instr_insert_after_cf(last_node, after);
+}
+
+static bool
+remove_use_cb(nir_src *src, void *state)
+{
+ nir_instr *instr = (nir_instr *) state;
+
+ if (src->is_ssa)
+ return true;
+
+ nir_register *reg = src->reg.reg;
+
+ struct set_entry *entry = _mesa_set_search(reg->uses,
+ _mesa_hash_pointer(instr),
+ instr);
+ if (entry)
+ _mesa_set_remove(reg->uses, entry);
+
+ return true;
+}
+
+static bool
+remove_def_cb(nir_dest *dest, void *state)
+{
+ nir_instr *instr = (nir_instr *) state;
+
+ if (dest->is_ssa)
+ return true;
+
+ nir_register *reg = dest->reg.reg;
+
+ struct set_entry *entry = _mesa_set_search(reg->defs,
+ _mesa_hash_pointer(instr),
+ instr);
+ if (entry)
+ _mesa_set_remove(reg->defs, entry);
+
+ return true;
+}
+
+static void
+remove_defs_uses(nir_instr *instr)
+{
+ nir_foreach_dest(instr, remove_def_cb, instr);
+ nir_foreach_src(instr, remove_use_cb, instr);
+}
+
+void nir_instr_remove(nir_instr *instr)
+{
+ remove_defs_uses(instr);
+ exec_node_remove(&instr->node);
+
+ if (instr->type == nir_instr_type_jump) {
+ nir_jump_instr *jump_instr = nir_instr_as_jump(instr);
+ handle_remove_jump(instr->block, jump_instr->type);
+ }
+}
+
+/*@}*/
+
+void
+nir_index_local_regs(nir_function_impl *impl)
+{
+ unsigned index = 0;
+ foreach_list_typed(nir_register, reg, node, &impl->registers) {
+ reg->index = index++;
+ }
+}
+
+void
+nir_index_global_regs(nir_shader *shader)
+{
+ unsigned index = 0;
+ foreach_list_typed(nir_register, reg, node, &shader->registers) {
+ reg->index = index++;
+ }
+}
+
+static bool
+visit_alu_dest(nir_alu_instr *instr, nir_foreach_dest_cb cb, void *state)
+{
+ return cb(&instr->dest.dest, state);
+}
+
+static bool
+visit_intrinsic_dest(nir_intrinsic_instr *instr, nir_foreach_dest_cb cb,
+ void *state)
+{
+ if (nir_intrinsic_infos[instr->intrinsic].has_dest)
+ return cb(&instr->dest, state);
+
+ return true;
+}
+
+static bool
+visit_texture_dest(nir_tex_instr *instr, nir_foreach_dest_cb cb,
+ void *state)
+{
+ return cb(&instr->dest, state);
+}
+
+static bool
+visit_load_const_dest(nir_load_const_instr *instr, nir_foreach_dest_cb cb,
+ void *state)
+{
+ return cb(&instr->dest, state);
+}
+
+static bool
+visit_phi_dest(nir_phi_instr *instr, nir_foreach_dest_cb cb, void *state)
+{
+ return cb(&instr->dest, state);
+}
+
+bool
+nir_foreach_dest(nir_instr *instr, nir_foreach_dest_cb cb, void *state)
+{
+ switch (instr->type) {
+ case nir_instr_type_alu:
+ return visit_alu_dest(nir_instr_as_alu(instr), cb, state);
+ case nir_instr_type_intrinsic:
+ return visit_intrinsic_dest(nir_instr_as_intrinsic(instr), cb, state);
+ case nir_instr_type_texture:
+ return visit_texture_dest(nir_instr_as_texture(instr), cb, state);
+ case nir_instr_type_load_const:
+ return visit_load_const_dest(nir_instr_as_load_const(instr), cb, state);
+ case nir_instr_type_phi:
+ return visit_phi_dest(nir_instr_as_phi(instr), cb, state);
+ break;
+
+ case nir_instr_type_ssa_undef:
+ case nir_instr_type_call:
+ case nir_instr_type_jump:
+ break;
+
+ default:
+ unreachable("Invalid instruction type");
+ break;
+ }
+
+ return true;
+}
+
+static bool
+visit_src(nir_src *src, nir_foreach_src_cb cb, void *state)
+{
+ if (!cb(src, state))
+ return false;
+ if (!src->is_ssa && src->reg.indirect)
+ return cb(src->reg.indirect, state);
+ return true;
+}
+
+static bool
+visit_deref_array_src(nir_deref_array *deref, nir_foreach_src_cb cb,
+ void *state)
+{
+ if (deref->has_indirect)
+ return visit_src(&deref->indirect, cb, state);
+ return true;
+}
+
+static bool
+visit_deref_src(nir_deref_var *deref, nir_foreach_src_cb cb, void *state)
+{
+ nir_deref *cur = &deref->deref;
+ while (cur != NULL) {
+ if (cur->deref_type == nir_deref_type_array)
+ if (!visit_deref_array_src(nir_deref_as_array(cur), cb, state))
+ return false;
+
+ cur = cur->child;
+ }
+
+ return true;
+}
+
+static bool
+visit_alu_src(nir_alu_instr *instr, nir_foreach_src_cb cb, void *state)
+{
+ for (unsigned i = 0; i < nir_op_infos[instr->op].num_inputs; i++)
+ if (!visit_src(&instr->src[i].src, cb, state))
+ return false;
+
+ if (instr->has_predicate)
+ if (!visit_src(&instr->predicate, cb, state))
+ return false;
+
+ return true;
+}
+
+static bool
+visit_tex_src(nir_tex_instr *instr, nir_foreach_src_cb cb, void *state)
+{
+ for (unsigned i = 0; i < instr->num_srcs; i++)
+ if (!visit_src(&instr->src[i], cb, state))
+ return false;
+
+ if (instr->has_predicate)
+ if (!visit_src(&instr->predicate, cb, state))
+ return false;
+
+ if (instr->sampler != NULL)
+ if (!visit_deref_src(instr->sampler, cb, state))
+ return false;
+
+ return true;
+}
+
+static bool
+visit_intrinsic_src(nir_intrinsic_instr *instr, nir_foreach_src_cb cb,
+ void *state)
+{
+ unsigned num_srcs = nir_intrinsic_infos[instr->intrinsic].num_srcs;
+ for (unsigned i = 0; i < num_srcs; i++)
+ if (!visit_src(&instr->src[i], cb, state))
+ return false;
+
+ unsigned num_vars =
+ nir_intrinsic_infos[instr->intrinsic].num_variables;
+ for (unsigned i = 0; i < num_vars; i++)
+ if (!visit_deref_src(instr->variables[i], cb, state))
+ return false;
+
+ if (instr->has_predicate)
+ if (!visit_src(&instr->predicate, cb, state))
+ return false;
+
+ return true;
+}
+
+static bool
+visit_call_src(nir_call_instr *instr, nir_foreach_src_cb cb, void *state)
+{
+ if (instr->has_predicate)
+ if (!visit_src(&instr->predicate, cb, state))
+ return false;
+
+ return true;
+}
+
+static bool
+visit_load_const_src(nir_load_const_instr *instr, nir_foreach_src_cb cb,
+ void *state)
+{
+ if (instr->has_predicate)
+ if (!visit_src(&instr->predicate, cb, state))
+ return false;
+
+ return true;
+}
+
+static bool
+visit_phi_src(nir_phi_instr *instr, nir_foreach_src_cb cb, void *state)
+{
+ foreach_list_typed(nir_phi_src, src, node, &instr->srcs) {
+ if (!visit_src(&src->src, cb, state))
+ return false;
+ }
+
+ return true;
+}
+
+typedef struct {
+ void *state;
+ nir_foreach_src_cb cb;
+} visit_dest_indirect_state;
+
+static bool
+visit_dest_indirect(nir_dest *dest, void *_state)
+{
+ visit_dest_indirect_state *state = (visit_dest_indirect_state *) _state;
+
+ if (!dest->is_ssa && dest->reg.indirect)
+ return state->cb(dest->reg.indirect, state->state);
+
+ return true;
+}
+
+bool
+nir_foreach_src(nir_instr *instr, nir_foreach_src_cb cb, void *state)
+{
+ switch (instr->type) {
+ case nir_instr_type_alu:
+ if (!visit_alu_src(nir_instr_as_alu(instr), cb, state))
+ return false;
+ break;
+ case nir_instr_type_intrinsic:
+ if (!visit_intrinsic_src(nir_instr_as_intrinsic(instr), cb, state))
+ return false;
+ break;
+ case nir_instr_type_texture:
+ if (!visit_tex_src(nir_instr_as_texture(instr), cb, state))
+ return false;
+ break;
+ case nir_instr_type_call:
+ if (!visit_call_src(nir_instr_as_call(instr), cb, state))
+ return false;
+ break;
+ case nir_instr_type_load_const:
+ if (!visit_load_const_src(nir_instr_as_load_const(instr), cb, state))
+ return false;
+ break;
+ case nir_instr_type_phi:
+ if (!visit_phi_src(nir_instr_as_phi(instr), cb, state))
+ return false;
+ break;
+ case nir_instr_type_jump:
+ case nir_instr_type_ssa_undef:
+ return true;
+
+ default:
+ unreachable("Invalid instruction type");
+ break;
+ }
+
+ visit_dest_indirect_state dest_state;
+ dest_state.state = state;
+ dest_state.cb = cb;
+ return nir_foreach_dest(instr, visit_dest_indirect, &dest_state);
+}
+
+
+static bool foreach_cf_node(nir_cf_node *node, nir_foreach_block_cb cb,
+ void *state);
+
+static bool
+foreach_block(nir_block *block, nir_foreach_block_cb cb, void *state)
+{
+ return cb(block, state);
+}
+
+static bool
+foreach_if(nir_if *if_stmt, nir_foreach_block_cb cb, void *state)
+{
+ foreach_list_typed(nir_cf_node, node, node, &if_stmt->then_list) {
+ if (!foreach_cf_node(node, cb, state))
+ return false;
+ }
+
+ foreach_list_typed(nir_cf_node, node, node, &if_stmt->else_list) {
+ if (!foreach_cf_node(node, cb, state))
+ return false;
+ }
+
+ return true;
+}
+
+static bool
+foreach_loop(nir_loop *loop, nir_foreach_block_cb cb, void *state)
+{
+ foreach_list_typed(nir_cf_node, node, node, &loop->body) {
+ if (!foreach_cf_node(node, cb, state))
+ return false;
+ }
+
+ return true;
+}
+
+static bool
+foreach_cf_node(nir_cf_node *node, nir_foreach_block_cb cb, void *state)
+{
+ switch (node->type) {
+ case nir_cf_node_block:
+ return foreach_block(nir_cf_node_as_block(node), cb, state);
+ case nir_cf_node_if:
+ return foreach_if(nir_cf_node_as_if(node), cb, state);
+ case nir_cf_node_loop:
+ return foreach_loop(nir_cf_node_as_loop(node), cb, state);
+ break;
+
+ default:
+ unreachable("Invalid CFG node type");
+ break;
+ }
+
+ return false;
+}
+
+bool
+nir_foreach_block(nir_function_impl *impl, nir_foreach_block_cb cb, void *state)
+{
+ foreach_list_typed(nir_cf_node, node, node, &impl->body) {
+ if (!foreach_cf_node(node, cb, state))
+ return false;
+ }
+
+ cb(impl->end_block, state);
+
+ return true;
+}
+
+static bool
+index_block(nir_block *block, void *state)
+{
+ unsigned *index = (unsigned *) state;
+ block->index = (*index)++;
+ return true;
+}
+
+void
+nir_index_blocks(nir_function_impl *impl)
+{
+ unsigned index = 0;
+
+ if (!impl->block_index_dirty)
+ return;
+
+ nir_foreach_block(impl, index_block, &index);
+
+ impl->num_blocks = index;
+ impl->block_index_dirty = false;
+}
+
+static void
+index_ssa_def(nir_ssa_def *def, unsigned *index)
+{
+ def->index = (*index)++;
+}
+
+static bool
+index_ssa_def_cb(nir_dest *dest, void *state)
+{
+ unsigned *index = (unsigned *) state;
+ if (dest->is_ssa)
+ index_ssa_def(&dest->ssa, index);
+ return true;
+}
+
+static void
+index_ssa_undef(nir_ssa_undef_instr *instr, unsigned *index)
+{
+ index_ssa_def(&instr->def, index);
+}
+
+static bool
+index_ssa_block(nir_block *block, void *state)
+{
+ unsigned *index = (unsigned *) state;
+
+ nir_foreach_instr(block, instr) {
+ if (instr->type == nir_instr_type_ssa_undef)
+ index_ssa_undef(nir_instr_as_ssa_undef(instr), index);
+ else
+ nir_foreach_dest(instr, index_ssa_def_cb, state);
+ }
+
+ return true;
+}
+
+void
+nir_index_ssa_defs(nir_function_impl *impl)
+{
+ unsigned index = 0;
+ nir_foreach_block(impl, index_ssa_block, &index);
+}
projects / mesa.git / commitdiff