diff options
Diffstat (limited to 'mesalib/src/glsl/nir/nir.c')
| -rw-r--r-- | mesalib/src/glsl/nir/nir.c | 2085 |
1 files changed, 2085 insertions, 0 deletions
diff --git a/mesalib/src/glsl/nir/nir.c b/mesalib/src/glsl/nir/nir.c new file mode 100644 index 000000000..5b0e4bc50 --- /dev/null +++ b/mesalib/src/glsl/nir/nir.c @@ -0,0 +1,2085 @@ +/* + * 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, const nir_shader_compiler_options *options) +{ + 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->options = options; + + 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; + + shader->num_inputs = 0; + shader->num_outputs = 0; + shader->num_uniforms = 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_hash_pointer, + _mesa_key_pointer_equal); + reg->defs = _mesa_set_create(mem_ctx, _mesa_hash_pointer, + _mesa_key_pointer_equal); + reg->if_uses = _mesa_set_create(mem_ctx, _mesa_hash_pointer, + _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; + func->shader = shader; + + 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(); + overload->impl = NULL; + + exec_list_push_tail(&func->overload_list, &overload->node); + overload->function = func; + + return overload; +} + +void nir_src_copy(nir_src *dest, const nir_src *src, void *mem_ctx) +{ + dest->is_ssa = src->is_ssa; + if (src->is_ssa) { + dest->ssa = src->ssa; + } else { + dest->reg.base_offset = src->reg.base_offset; + dest->reg.reg = src->reg.reg; + if (src->reg.indirect) { + dest->reg.indirect = ralloc(mem_ctx, nir_src); + nir_src_copy(dest->reg.indirect, src->reg.indirect, mem_ctx); + } else { + dest->reg.indirect = NULL; + } + } +} + +void nir_dest_copy(nir_dest *dest, const nir_dest *src, void *mem_ctx) +{ + dest->is_ssa = src->is_ssa; + if (src->is_ssa) { + dest->ssa = src->ssa; + } else { + dest->reg.base_offset = src->reg.base_offset; + dest->reg.reg = src->reg.reg; + if (src->reg.indirect) { + dest->reg.indirect = ralloc(mem_ctx, nir_src); + nir_src_copy(dest->reg.indirect, src->reg.indirect, mem_ctx); + } else { + dest->reg.indirect = NULL; + } + } +} + +void +nir_alu_src_copy(nir_alu_src *dest, const nir_alu_src *src, void *mem_ctx) +{ + nir_src_copy(&dest->src, &src->src, mem_ctx); + dest->abs = src->abs; + dest->negate = src->negate; + for (unsigned i = 0; i < 4; i++) + dest->swizzle[i] = src->swizzle[i]; +} + +void +nir_alu_dest_copy(nir_alu_dest *dest, const nir_alu_dest *src, void *mem_ctx) +{ + nir_dest_copy(&dest->dest, &src->dest, mem_ctx); + dest->write_mask = src->write_mask; + dest->saturate = src->saturate; +} + +static inline void +block_add_pred(nir_block *block, nir_block *pred) +{ + _mesa_set_add(block->predecessors, 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, 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->valid_metadata = nir_metadata_none; + + /* 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_hash_pointer, + _mesa_key_pointer_equal); + block->imm_dom = NULL; + block->dom_frontier = _mesa_set_create(mem_ctx, _mesa_hash_pointer, + _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]); + + 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, unsigned num_components) +{ + nir_load_const_instr *instr = ralloc(mem_ctx, nir_load_const_instr); + instr_init(&instr->instr, nir_instr_type_load_const); + + nir_ssa_def_init(&instr->instr, &instr->def, num_components, NULL); + + 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]); + + 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; + + 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_tex); + + dest_init(&instr->dest); + + instr->num_srcs = num_srcs; + instr->src = ralloc_array(mem_ctx, nir_tex_src, num_srcs); + for (unsigned i = 0; i < num_srcs; i++) + src_init(&instr->src[i].src); + + instr->sampler_index = 0; + instr->sampler_array_size = 0; + instr->sampler = NULL; + + 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_parallel_copy_instr * +nir_parallel_copy_instr_create(void *mem_ctx) +{ + nir_parallel_copy_instr *instr = ralloc(mem_ctx, nir_parallel_copy_instr); + instr_init(&instr->instr, nir_instr_type_parallel_copy); + + exec_list_make_empty(&instr->entries); + + return instr; +} + +nir_ssa_undef_instr * +nir_ssa_undef_instr_create(void *mem_ctx, unsigned num_components) +{ + nir_ssa_undef_instr *instr = ralloc(mem_ctx, nir_ssa_undef_instr); + instr_init(&instr->instr, nir_instr_type_ssa_undef); + + nir_ssa_def_init(&instr->instr, &instr->def, num_components, NULL); + + 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->deref_array_type = nir_deref_array_type_direct; + src_init(&deref->indirect); + deref->base_offset = 0; + return deref; +} + +nir_deref_struct * +nir_deref_struct_create(void *mem_ctx, unsigned field_index) +{ + nir_deref_struct *deref = ralloc(mem_ctx, nir_deref_struct); + deref->deref.deref_type = nir_deref_type_struct; + deref->deref.child = NULL; + deref->index = field_index; + 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); + 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_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; + ret->deref_array_type = deref->deref_array_type; + if (deref->deref_array_type == nir_deref_array_type_indirect) { + nir_src_copy(&ret->indirect, &deref->indirect, mem_ctx); + } + 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->index); + 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; +} + +static void +rewrite_phi_preds(nir_block *block, nir_block *old_pred, nir_block *new_pred) +{ + nir_foreach_instr_safe(block, instr) { + if (instr->type != nir_instr_type_phi) + break; + + nir_phi_instr *phi = nir_instr_as_phi(instr); + nir_foreach_phi_src(phi, src) { + if (src->pred == old_pred) { + src->pred = new_pred; + break; + } + } + } +} + +/** + * 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]; + nir_block *succ2 = source->successors[1]; + + if (succ1) { + unlink_blocks(source, succ1); + rewrite_phi_preds(succ1, source, dest); + } + + if (succ2) { + unlink_blocks(source, succ2); + rewrite_phi_preds(succ2, source, dest); + } + + 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); + + nir_function_impl *impl = nir_cf_node_get_function(&block->cf_node); + nir_metadata_preserve(impl, nir_metadata_none); + + 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 { + assert(jump_instr->type == nir_jump_return); + 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); + } + } + + nir_function_impl *impl = nir_cf_node_get_function(&block->cf_node); + nir_metadata_preserve(impl, nir_metadata_none); +} + +/** + * 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); + + struct set *if_uses_set = if_stmt->condition.is_ssa ? + if_stmt->condition.ssa->if_uses : + if_stmt->condition.reg.reg->uses; + + _mesa_set_add(if_uses_set, 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); + nir_metadata_preserve(impl, nir_metadata_none); +} + +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); + nir_metadata_preserve(impl, nir_metadata_none); +} + +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); +} + +static void +remove_defs_uses(nir_instr *instr); + +static void +cleanup_cf_node(nir_cf_node *node) +{ + switch (node->type) { + case nir_cf_node_block: { + nir_block *block = nir_cf_node_as_block(node); + /* We need to walk the instructions and clean up defs/uses */ + nir_foreach_instr(block, instr) + remove_defs_uses(instr); + break; + } + + case nir_cf_node_if: { + nir_if *if_stmt = nir_cf_node_as_if(node); + foreach_list_typed(nir_cf_node, child, node, &if_stmt->then_list) + cleanup_cf_node(child); + foreach_list_typed(nir_cf_node, child, node, &if_stmt->else_list) + cleanup_cf_node(child); + + struct set *if_uses; + if (if_stmt->condition.is_ssa) { + if_uses = if_stmt->condition.ssa->if_uses; + } else { + if_uses = if_stmt->condition.reg.reg->if_uses; + } + + struct set_entry *entry = _mesa_set_search(if_uses, if_stmt); + assert(entry); + _mesa_set_remove(if_uses, entry); + break; + } + + case nir_cf_node_loop: { + nir_loop *loop = nir_cf_node_as_loop(node); + foreach_list_typed(nir_cf_node, child, node, &loop->body) + cleanup_cf_node(child); + break; + } + case nir_cf_node_function: { + nir_function_impl *impl = nir_cf_node_as_function(node); + foreach_list_typed(nir_cf_node, child, node, &impl->body) + cleanup_cf_node(child); + break; + } + default: + unreachable("Invalid CF node type"); + } +} + +void +nir_cf_node_remove(nir_cf_node *node) +{ + nir_function_impl *impl = nir_cf_node_get_function(node); + nir_metadata_preserve(impl, nir_metadata_none); + + 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); + } + + cleanup_cf_node(node); +} + +static bool +add_use_cb(nir_src *src, void *state) +{ + nir_instr *instr = state; + + struct set *uses_set = src->is_ssa ? src->ssa->uses : src->reg.reg->uses; + + _mesa_set_add(uses_set, instr); + + return true; +} + +static bool +add_ssa_def_cb(nir_ssa_def *def, void *state) +{ + nir_instr *instr = state; + + if (instr->block && def->index == UINT_MAX) { + nir_function_impl *impl = + nir_cf_node_get_function(&instr->block->cf_node); + + def->index = impl->ssa_alloc++; + } + + return true; +} + +static bool +add_reg_def_cb(nir_dest *dest, void *state) +{ + nir_instr *instr = state; + + if (!dest->is_ssa) + _mesa_set_add(dest->reg.reg->defs, instr); + + return true; +} + +static void +add_defs_uses(nir_instr *instr) +{ + nir_foreach_src(instr, add_use_cb, instr); + nir_foreach_dest(instr, add_reg_def_cb, instr); + nir_foreach_ssa_def(instr, add_ssa_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 = state; + + struct set *uses_set = src->is_ssa ? src->ssa->uses : src->reg.reg->uses; + + struct set_entry *entry = _mesa_set_search(uses_set, instr); + if (entry) + _mesa_set_remove(uses_set, entry); + + return true; +} + +static bool +remove_def_cb(nir_dest *dest, void *state) +{ + nir_instr *instr = state; + + if (dest->is_ssa) + return true; + + nir_register *reg = dest->reg.reg; + + struct set_entry *entry = _mesa_set_search(reg->defs, 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++; + } + impl->reg_alloc = index; +} + +void +nir_index_global_regs(nir_shader *shader) +{ + unsigned index = 0; + foreach_list_typed(nir_register, reg, node, &shader->registers) { + reg->index = index++; + } + shader->reg_alloc = 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_phi_dest(nir_phi_instr *instr, nir_foreach_dest_cb cb, void *state) +{ + return cb(&instr->dest, state); +} + +static bool +visit_parallel_copy_dest(nir_parallel_copy_instr *instr, + nir_foreach_dest_cb cb, void *state) +{ + nir_foreach_parallel_copy_entry(instr, entry) { + if (!cb(&entry->dest, state)) + return false; + } + + return true; +} + +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_tex: + return visit_texture_dest(nir_instr_as_tex(instr), cb, state); + case nir_instr_type_phi: + return visit_phi_dest(nir_instr_as_phi(instr), cb, state); + case nir_instr_type_parallel_copy: + return visit_parallel_copy_dest(nir_instr_as_parallel_copy(instr), + cb, state); + + case nir_instr_type_load_const: + 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; +} + +struct foreach_ssa_def_state { + nir_foreach_ssa_def_cb cb; + void *client_state; +}; + +static inline bool +nir_ssa_def_visitor(nir_dest *dest, void *void_state) +{ + struct foreach_ssa_def_state *state = void_state; + + if (dest->is_ssa) + return state->cb(&dest->ssa, state->client_state); + else + return true; +} + +bool +nir_foreach_ssa_def(nir_instr *instr, nir_foreach_ssa_def_cb cb, void *state) +{ + switch (instr->type) { + case nir_instr_type_alu: + case nir_instr_type_tex: + case nir_instr_type_intrinsic: + case nir_instr_type_phi: + case nir_instr_type_parallel_copy: { + struct foreach_ssa_def_state foreach_state = {cb, state}; + return nir_foreach_dest(instr, nir_ssa_def_visitor, &foreach_state); + } + + case nir_instr_type_load_const: + return cb(&nir_instr_as_load_const(instr)->def, state); + case nir_instr_type_ssa_undef: + return cb(&nir_instr_as_ssa_undef(instr)->def, state); + case nir_instr_type_call: + case nir_instr_type_jump: + return true; + default: + unreachable("Invalid instruction type"); + } +} + +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->deref_array_type == nir_deref_array_type_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; + + 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].src, 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; + + return true; +} + +static bool +visit_call_src(nir_call_instr *instr, nir_foreach_src_cb cb, void *state) +{ + return true; +} + +static bool +visit_load_const_src(nir_load_const_instr *instr, nir_foreach_src_cb cb, + void *state) +{ + return true; +} + +static bool +visit_phi_src(nir_phi_instr *instr, nir_foreach_src_cb cb, void *state) +{ + nir_foreach_phi_src(instr, src) { + if (!visit_src(&src->src, cb, state)) + return false; + } + + return true; +} + +static bool +visit_parallel_copy_src(nir_parallel_copy_instr *instr, + nir_foreach_src_cb cb, void *state) +{ + nir_foreach_parallel_copy_entry(instr, entry) { + if (!visit_src(&entry->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_tex: + if (!visit_tex_src(nir_instr_as_tex(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_parallel_copy: + if (!visit_parallel_copy_src(nir_instr_as_parallel_copy(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); +} + +nir_const_value * +nir_src_as_const_value(nir_src src) +{ + if (!src.is_ssa) + return NULL; + + if (src.ssa->parent_instr->type != nir_instr_type_load_const) + return NULL; + + nir_load_const_instr *load = nir_instr_as_load_const(src.ssa->parent_instr); + + return &load->value; +} + +bool +nir_srcs_equal(nir_src src1, nir_src src2) +{ + if (src1.is_ssa) { + if (src2.is_ssa) { + return src1.ssa == src2.ssa; + } else { + return false; + } + } else { + if (src2.is_ssa) { + return false; + } else { + if ((src1.reg.indirect == NULL) != (src2.reg.indirect == NULL)) + return false; + + if (src1.reg.indirect) { + if (!nir_srcs_equal(*src1.reg.indirect, *src2.reg.indirect)) + return false; + } + + return src1.reg.reg == src2.reg.reg && + src1.reg.base_offset == src2.reg.base_offset; + } + } +} + +static bool +src_does_not_use_def(nir_src *src, void *void_def) +{ + nir_ssa_def *def = void_def; + + if (src->is_ssa) { + return src->ssa != def; + } else { + return true; + } +} + +static bool +src_does_not_use_reg(nir_src *src, void *void_reg) +{ + nir_register *reg = void_reg; + + if (src->is_ssa) { + return true; + } else { + return src->reg.reg != reg; + } +} + +void +nir_instr_rewrite_src(nir_instr *instr, nir_src *src, nir_src new_src) +{ + if (src->is_ssa) { + nir_ssa_def *old_ssa = src->ssa; + *src = new_src; + if (old_ssa && nir_foreach_src(instr, src_does_not_use_def, old_ssa)) { + struct set_entry *entry = _mesa_set_search(old_ssa->uses, instr); + assert(entry); + _mesa_set_remove(old_ssa->uses, entry); + } + } else { + if (src->reg.indirect) + nir_instr_rewrite_src(instr, src->reg.indirect, new_src); + + nir_register *old_reg = src->reg.reg; + *src = new_src; + if (old_reg && nir_foreach_src(instr, src_does_not_use_reg, old_reg)) { + struct set_entry *entry = _mesa_set_search(old_reg->uses, instr); + assert(entry); + _mesa_set_remove(old_reg->uses, entry); + } + } + + if (new_src.is_ssa) { + if (new_src.ssa) + _mesa_set_add(new_src.ssa->uses, instr); + } else { + if (new_src.reg.reg) + _mesa_set_add(new_src.reg.reg->uses, instr); + } +} + +void +nir_ssa_def_init(nir_instr *instr, nir_ssa_def *def, + unsigned num_components, const char *name) +{ + void *mem_ctx = ralloc_parent(instr); + + def->name = name; + def->parent_instr = instr; + def->uses = _mesa_set_create(mem_ctx, _mesa_hash_pointer, + _mesa_key_pointer_equal); + def->if_uses = _mesa_set_create(mem_ctx, _mesa_hash_pointer, + _mesa_key_pointer_equal); + def->num_components = num_components; + + if (instr->block) { + nir_function_impl *impl = + nir_cf_node_get_function(&instr->block->cf_node); + + def->index = impl->ssa_alloc++; + } else { + def->index = UINT_MAX; + } +} + +void +nir_ssa_dest_init(nir_instr *instr, nir_dest *dest, + unsigned num_components, const char *name) +{ + dest->is_ssa = true; + nir_ssa_def_init(instr, &dest->ssa, num_components, name); +} + +struct ssa_def_rewrite_state { + void *mem_ctx; + nir_ssa_def *old; + nir_src new_src; +}; + +static bool +ssa_def_rewrite_uses_src(nir_src *src, void *void_state) +{ + struct ssa_def_rewrite_state *state = void_state; + + if (src->is_ssa && src->ssa == state->old) + nir_src_copy(src, &state->new_src, state->mem_ctx); + + return true; +} + +void +nir_ssa_def_rewrite_uses(nir_ssa_def *def, nir_src new_src, void *mem_ctx) +{ + struct ssa_def_rewrite_state state; + state.mem_ctx = mem_ctx; + state.old = def; + state.new_src = new_src; + + assert(!new_src.is_ssa || def != new_src.ssa); + + struct set *new_uses, *new_if_uses; + if (new_src.is_ssa) { + new_uses = new_src.ssa->uses; + new_if_uses = new_src.ssa->if_uses; + } else { + new_uses = new_src.reg.reg->uses; + new_if_uses = new_src.reg.reg->if_uses; + } + + struct set_entry *entry; + set_foreach(def->uses, entry) { + nir_instr *instr = (nir_instr *)entry->key; + + _mesa_set_remove(def->uses, entry); + nir_foreach_src(instr, ssa_def_rewrite_uses_src, &state); + _mesa_set_add(new_uses, instr); + } + + set_foreach(def->if_uses, entry) { + nir_if *if_use = (nir_if *)entry->key; + + _mesa_set_remove(def->if_uses, entry); + nir_src_copy(&if_use->condition, &new_src, mem_ctx); + _mesa_set_add(new_if_uses, if_use); + } +} + + +static bool foreach_cf_node(nir_cf_node *node, nir_foreach_block_cb cb, + bool reverse, void *state); + +static inline bool +foreach_if(nir_if *if_stmt, nir_foreach_block_cb cb, bool reverse, void *state) +{ + if (reverse) { + foreach_list_typed_safe_reverse(nir_cf_node, node, node, + &if_stmt->else_list) { + if (!foreach_cf_node(node, cb, reverse, state)) + return false; + } + + foreach_list_typed_safe_reverse(nir_cf_node, node, node, + &if_stmt->then_list) { + if (!foreach_cf_node(node, cb, reverse, state)) + return false; + } + } else { + foreach_list_typed_safe(nir_cf_node, node, node, &if_stmt->then_list) { + if (!foreach_cf_node(node, cb, reverse, state)) + return false; + } + + foreach_list_typed_safe(nir_cf_node, node, node, &if_stmt->else_list) { + if (!foreach_cf_node(node, cb, reverse, state)) + return false; + } + } + + return true; +} + +static inline bool +foreach_loop(nir_loop *loop, nir_foreach_block_cb cb, bool reverse, void *state) +{ + if (reverse) { + foreach_list_typed_safe_reverse(nir_cf_node, node, node, &loop->body) { + if (!foreach_cf_node(node, cb, reverse, state)) + return false; + } + } else { + foreach_list_typed_safe(nir_cf_node, node, node, &loop->body) { + if (!foreach_cf_node(node, cb, reverse, state)) + return false; + } + } + + return true; +} + +static bool +foreach_cf_node(nir_cf_node *node, nir_foreach_block_cb cb, + bool reverse, void *state) +{ + switch (node->type) { + case nir_cf_node_block: + return cb(nir_cf_node_as_block(node), state); + case nir_cf_node_if: + return foreach_if(nir_cf_node_as_if(node), cb, reverse, state); + case nir_cf_node_loop: + return foreach_loop(nir_cf_node_as_loop(node), cb, reverse, 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_safe(nir_cf_node, node, node, &impl->body) { + if (!foreach_cf_node(node, cb, false, state)) + return false; + } + + return cb(impl->end_block, state); +} + +bool +nir_foreach_block_reverse(nir_function_impl *impl, nir_foreach_block_cb cb, + void *state) +{ + if (!cb(impl->end_block, state)) + return false; + + foreach_list_typed_safe_reverse(nir_cf_node, node, node, &impl->body) { + if (!foreach_cf_node(node, cb, true, state)) + return false; + } + + return true; +} + +nir_if * +nir_block_get_following_if(nir_block *block) +{ + if (exec_node_is_tail_sentinel(&block->cf_node.node)) + return NULL; + + if (nir_cf_node_is_last(&block->cf_node)) + return NULL; + + nir_cf_node *next_node = nir_cf_node_next(&block->cf_node); + + if (next_node->type != nir_cf_node_if) + return NULL; + + return nir_cf_node_as_if(next_node); +} + +static bool +index_block(nir_block *block, void *state) +{ + unsigned *index = state; + block->index = (*index)++; + return true; +} + +void +nir_index_blocks(nir_function_impl *impl) +{ + unsigned index = 0; + + if (impl->valid_metadata & nir_metadata_block_index) + return; + + nir_foreach_block(impl, index_block, &index); + + impl->num_blocks = index; +} + +static bool +index_ssa_def_cb(nir_ssa_def *def, void *state) +{ + unsigned *index = (unsigned *) state; + def->index = (*index)++; + + return true; +} + +static bool +index_ssa_block(nir_block *block, void *state) +{ + nir_foreach_instr(block, instr) + nir_foreach_ssa_def(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); + impl->ssa_alloc = index; +} |