81b4e48f9f
* Remove some uses of riscv in tests * Fix typo * Apply suggestions from code review * Apply suggestions from code review Co-authored-by: Benjamin Bouvier <public@benj.me>
1318 lines
47 KiB
Rust
1318 lines
47 KiB
Rust
//! A frontend for building Cranelift IR from other languages.
|
|
use crate::ssa::{SSABuilder, SideEffects};
|
|
use crate::variable::Variable;
|
|
use cranelift_codegen::cursor::{Cursor, FuncCursor};
|
|
use cranelift_codegen::entity::{EntitySet, SecondaryMap};
|
|
use cranelift_codegen::ir;
|
|
use cranelift_codegen::ir::function::DisplayFunction;
|
|
use cranelift_codegen::ir::{
|
|
types, AbiParam, Block, DataFlowGraph, ExtFuncData, ExternalName, FuncRef, Function,
|
|
GlobalValue, GlobalValueData, Heap, HeapData, Inst, InstBuilder, InstBuilderBase,
|
|
InstructionData, JumpTable, JumpTableData, LibCall, MemFlags, SigRef, Signature, StackSlot,
|
|
StackSlotData, Type, Value, ValueLabel, ValueLabelAssignments, ValueLabelStart,
|
|
};
|
|
use cranelift_codegen::isa::{TargetFrontendConfig, TargetIsa};
|
|
use cranelift_codegen::packed_option::PackedOption;
|
|
|
|
/// Structure used for translating a series of functions into Cranelift IR.
|
|
///
|
|
/// In order to reduce memory reallocations when compiling multiple functions,
|
|
/// `FunctionBuilderContext` holds various data structures which are cleared between
|
|
/// functions, rather than dropped, preserving the underlying allocations.
|
|
pub struct FunctionBuilderContext {
|
|
ssa: SSABuilder,
|
|
blocks: SecondaryMap<Block, BlockData>,
|
|
types: SecondaryMap<Variable, Type>,
|
|
}
|
|
|
|
/// Temporary object used to build a single Cranelift IR `Function`.
|
|
pub struct FunctionBuilder<'a> {
|
|
/// The function currently being built.
|
|
/// This field is public so the function can be re-borrowed.
|
|
pub func: &'a mut Function,
|
|
|
|
/// Source location to assign to all new instructions.
|
|
srcloc: ir::SourceLoc,
|
|
|
|
func_ctx: &'a mut FunctionBuilderContext,
|
|
position: PackedOption<Block>,
|
|
}
|
|
|
|
#[derive(Clone, Default)]
|
|
struct BlockData {
|
|
/// A Block is "pristine" iff no instructions have been added since the last
|
|
/// call to `switch_to_block()`.
|
|
pristine: bool,
|
|
|
|
/// A Block is "filled" iff a terminator instruction has been inserted since
|
|
/// the last call to `switch_to_block()`.
|
|
///
|
|
/// A filled block cannot be pristine.
|
|
filled: bool,
|
|
|
|
/// Count of parameters not supplied implicitly by the SSABuilder.
|
|
user_param_count: usize,
|
|
}
|
|
|
|
impl FunctionBuilderContext {
|
|
/// Creates a FunctionBuilderContext structure. The structure is automatically cleared after
|
|
/// each [`FunctionBuilder`](struct.FunctionBuilder.html) completes translating a function.
|
|
pub fn new() -> Self {
|
|
Self {
|
|
ssa: SSABuilder::new(),
|
|
blocks: SecondaryMap::new(),
|
|
types: SecondaryMap::new(),
|
|
}
|
|
}
|
|
|
|
fn clear(&mut self) {
|
|
self.ssa.clear();
|
|
self.blocks.clear();
|
|
self.types.clear();
|
|
}
|
|
|
|
fn is_empty(&self) -> bool {
|
|
self.ssa.is_empty() && self.blocks.is_empty() && self.types.is_empty()
|
|
}
|
|
}
|
|
|
|
/// Implementation of the [`InstBuilder`](cranelift_codegen::ir::InstBuilder) that has
|
|
/// one convenience method per Cranelift IR instruction.
|
|
pub struct FuncInstBuilder<'short, 'long: 'short> {
|
|
builder: &'short mut FunctionBuilder<'long>,
|
|
block: Block,
|
|
}
|
|
|
|
impl<'short, 'long> FuncInstBuilder<'short, 'long> {
|
|
fn new(builder: &'short mut FunctionBuilder<'long>, block: Block) -> Self {
|
|
Self { builder, block }
|
|
}
|
|
}
|
|
|
|
impl<'short, 'long> InstBuilderBase<'short> for FuncInstBuilder<'short, 'long> {
|
|
fn data_flow_graph(&self) -> &DataFlowGraph {
|
|
&self.builder.func.dfg
|
|
}
|
|
|
|
fn data_flow_graph_mut(&mut self) -> &mut DataFlowGraph {
|
|
&mut self.builder.func.dfg
|
|
}
|
|
|
|
// This implementation is richer than `InsertBuilder` because we use the data of the
|
|
// instruction being inserted to add related info to the DFG and the SSA building system,
|
|
// and perform debug sanity checks.
|
|
fn build(self, data: InstructionData, ctrl_typevar: Type) -> (Inst, &'short mut DataFlowGraph) {
|
|
// We only insert the Block in the layout when an instruction is added to it
|
|
self.builder.ensure_inserted_block();
|
|
|
|
let inst = self.builder.func.dfg.make_inst(data.clone());
|
|
self.builder.func.dfg.make_inst_results(inst, ctrl_typevar);
|
|
self.builder.func.layout.append_inst(inst, self.block);
|
|
if !self.builder.srcloc.is_default() {
|
|
self.builder.func.srclocs[inst] = self.builder.srcloc;
|
|
}
|
|
|
|
if data.opcode().is_branch() {
|
|
match data.branch_destination() {
|
|
Some(dest_block) => {
|
|
// If the user has supplied jump arguments we must adapt the arguments of
|
|
// the destination block
|
|
self.builder.declare_successor(dest_block, inst);
|
|
}
|
|
None => {
|
|
// branch_destination() doesn't detect jump_tables
|
|
// If jump table we declare all entries successor
|
|
if let InstructionData::BranchTable {
|
|
table, destination, ..
|
|
} = data
|
|
{
|
|
// Unlike all other jumps/branches, jump tables are
|
|
// capable of having the same successor appear
|
|
// multiple times, so we must deduplicate.
|
|
let mut unique = EntitySet::<Block>::new();
|
|
for dest_block in self
|
|
.builder
|
|
.func
|
|
.jump_tables
|
|
.get(table)
|
|
.expect("you are referencing an undeclared jump table")
|
|
.iter()
|
|
.filter(|&dest_block| unique.insert(*dest_block))
|
|
{
|
|
// Call `declare_block_predecessor` instead of `declare_successor` for
|
|
// avoiding the borrow checker.
|
|
self.builder.func_ctx.ssa.declare_block_predecessor(
|
|
*dest_block,
|
|
self.builder.position.unwrap(),
|
|
inst,
|
|
);
|
|
}
|
|
self.builder.declare_successor(destination, inst);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if data.opcode().is_terminator() {
|
|
self.builder.fill_current_block()
|
|
}
|
|
(inst, &mut self.builder.func.dfg)
|
|
}
|
|
}
|
|
|
|
/// This module allows you to create a function in Cranelift IR in a straightforward way, hiding
|
|
/// all the complexity of its internal representation.
|
|
///
|
|
/// The module is parametrized by one type which is the representation of variables in your
|
|
/// origin language. It offers a way to conveniently append instruction to your program flow.
|
|
/// You are responsible to split your instruction flow into extended blocks (declared with
|
|
/// `create_block`) whose properties are:
|
|
///
|
|
/// - branch and jump instructions can only point at the top of extended blocks;
|
|
/// - the last instruction of each block is a terminator instruction which has no natural successor,
|
|
/// and those instructions can only appear at the end of extended blocks.
|
|
///
|
|
/// The parameters of Cranelift IR instructions are Cranelift IR values, which can only be created
|
|
/// as results of other Cranelift IR instructions. To be able to create variables redefined multiple
|
|
/// times in your program, use the `def_var` and `use_var` command, that will maintain the
|
|
/// correspondence between your variables and Cranelift IR SSA values.
|
|
///
|
|
/// The first block for which you call `switch_to_block` will be assumed to be the beginning of
|
|
/// the function.
|
|
///
|
|
/// At creation, a `FunctionBuilder` instance borrows an already allocated `Function` which it
|
|
/// modifies with the information stored in the mutable borrowed
|
|
/// [`FunctionBuilderContext`](struct.FunctionBuilderContext.html). The function passed in
|
|
/// argument should be newly created with
|
|
/// [`Function::with_name_signature()`](Function::with_name_signature), whereas the
|
|
/// `FunctionBuilderContext` can be kept as is between two function translations.
|
|
///
|
|
/// # Errors
|
|
///
|
|
/// The functions below will panic in debug mode whenever you try to modify the Cranelift IR
|
|
/// function in a way that violate the coherence of the code. For instance: switching to a new
|
|
/// `Block` when you haven't filled the current one with a terminator instruction, inserting a
|
|
/// return instruction with arguments that don't match the function's signature.
|
|
impl<'a> FunctionBuilder<'a> {
|
|
/// Creates a new FunctionBuilder structure that will operate on a `Function` using a
|
|
/// `FunctionBuilderContext`.
|
|
pub fn new(func: &'a mut Function, func_ctx: &'a mut FunctionBuilderContext) -> Self {
|
|
debug_assert!(func_ctx.is_empty());
|
|
Self {
|
|
func,
|
|
srcloc: Default::default(),
|
|
func_ctx,
|
|
position: Default::default(),
|
|
}
|
|
}
|
|
|
|
/// Get the block that this builder is currently at.
|
|
pub fn current_block(&self) -> Option<Block> {
|
|
self.position.expand()
|
|
}
|
|
|
|
/// Set the source location that should be assigned to all new instructions.
|
|
pub fn set_srcloc(&mut self, srcloc: ir::SourceLoc) {
|
|
self.srcloc = srcloc;
|
|
}
|
|
|
|
/// Creates a new `Block` and returns its reference.
|
|
pub fn create_block(&mut self) -> Block {
|
|
let block = self.func.dfg.make_block();
|
|
self.func_ctx.ssa.declare_block(block);
|
|
self.func_ctx.blocks[block] = BlockData {
|
|
filled: false,
|
|
pristine: true,
|
|
user_param_count: 0,
|
|
};
|
|
block
|
|
}
|
|
|
|
/// Insert `block` in the layout *after* the existing block `after`.
|
|
pub fn insert_block_after(&mut self, block: Block, after: Block) {
|
|
self.func.layout.insert_block_after(block, after);
|
|
}
|
|
|
|
/// After the call to this function, new instructions will be inserted into the designated
|
|
/// block, in the order they are declared. You must declare the types of the Block arguments
|
|
/// you will use here.
|
|
///
|
|
/// When inserting the terminator instruction (which doesn't have a fallthrough to its immediate
|
|
/// successor), the block will be declared filled and it will not be possible to append
|
|
/// instructions to it.
|
|
pub fn switch_to_block(&mut self, block: Block) {
|
|
// First we check that the previous block has been filled.
|
|
debug_assert!(
|
|
self.position.is_none()
|
|
|| self.is_unreachable()
|
|
|| self.is_pristine()
|
|
|| self.is_filled(),
|
|
"you have to fill your block before switching"
|
|
);
|
|
// We cannot switch to a filled block
|
|
debug_assert!(
|
|
!self.func_ctx.blocks[block].filled,
|
|
"you cannot switch to a block which is already filled"
|
|
);
|
|
|
|
// Then we change the cursor position.
|
|
self.position = PackedOption::from(block);
|
|
}
|
|
|
|
/// Declares that all the predecessors of this block are known.
|
|
///
|
|
/// Function to call with `block` as soon as the last branch instruction to `block` has been
|
|
/// created. Forgetting to call this method on every block will cause inconsistencies in the
|
|
/// produced functions.
|
|
pub fn seal_block(&mut self, block: Block) {
|
|
let side_effects = self.func_ctx.ssa.seal_block(block, self.func);
|
|
self.handle_ssa_side_effects(side_effects);
|
|
}
|
|
|
|
/// Effectively calls seal_block on all unsealed blocks in the function.
|
|
///
|
|
/// It's more efficient to seal `Block`s as soon as possible, during
|
|
/// translation, but for frontends where this is impractical to do, this
|
|
/// function can be used at the end of translating all blocks to ensure
|
|
/// that everything is sealed.
|
|
pub fn seal_all_blocks(&mut self) {
|
|
let side_effects = self.func_ctx.ssa.seal_all_blocks(self.func);
|
|
self.handle_ssa_side_effects(side_effects);
|
|
}
|
|
|
|
/// In order to use a variable in a `use_var`, you need to declare its type with this method.
|
|
pub fn declare_var(&mut self, var: Variable, ty: Type) {
|
|
debug_assert_eq!(
|
|
self.func_ctx.types[var],
|
|
types::INVALID,
|
|
"variable {:?} is declared twice",
|
|
var
|
|
);
|
|
self.func_ctx.types[var] = ty;
|
|
}
|
|
|
|
/// Returns the Cranelift IR value corresponding to the utilization at the current program
|
|
/// position of a previously defined user variable.
|
|
pub fn use_var(&mut self, var: Variable) -> Value {
|
|
let (val, side_effects) = {
|
|
let ty = *self.func_ctx.types.get(var).unwrap_or_else(|| {
|
|
panic!(
|
|
"variable {:?} is used but its type has not been declared",
|
|
var
|
|
)
|
|
});
|
|
debug_assert_ne!(
|
|
ty,
|
|
types::INVALID,
|
|
"variable {:?} is used but its type has not been declared",
|
|
var
|
|
);
|
|
self.func_ctx
|
|
.ssa
|
|
.use_var(self.func, var, ty, self.position.unwrap())
|
|
};
|
|
self.handle_ssa_side_effects(side_effects);
|
|
val
|
|
}
|
|
|
|
/// Register a new definition of a user variable. The type of the value must be
|
|
/// the same as the type registered for the variable.
|
|
pub fn def_var(&mut self, var: Variable, val: Value) {
|
|
debug_assert_eq!(
|
|
*self.func_ctx.types.get(var).unwrap_or_else(|| panic!(
|
|
"variable {:?} is used but its type has not been declared",
|
|
var
|
|
)),
|
|
self.func.dfg.value_type(val),
|
|
"declared type of variable {:?} doesn't match type of value {}",
|
|
var,
|
|
val
|
|
);
|
|
|
|
self.func_ctx.ssa.def_var(var, val, self.position.unwrap());
|
|
}
|
|
|
|
/// Set label for Value
|
|
///
|
|
/// This will not do anything unless `func.dfg.collect_debug_info` is called first.
|
|
pub fn set_val_label(&mut self, val: Value, label: ValueLabel) {
|
|
if let Some(values_labels) = self.func.dfg.values_labels.as_mut() {
|
|
use crate::hash_map::Entry;
|
|
|
|
let start = ValueLabelStart {
|
|
from: self.srcloc,
|
|
label,
|
|
};
|
|
|
|
match values_labels.entry(val) {
|
|
Entry::Occupied(mut e) => match e.get_mut() {
|
|
ValueLabelAssignments::Starts(starts) => starts.push(start),
|
|
_ => panic!("Unexpected ValueLabelAssignments at this stage"),
|
|
},
|
|
Entry::Vacant(e) => {
|
|
e.insert(ValueLabelAssignments::Starts(vec![start]));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Creates a jump table in the function, to be used by `br_table` instructions.
|
|
pub fn create_jump_table(&mut self, data: JumpTableData) -> JumpTable {
|
|
self.func.create_jump_table(data)
|
|
}
|
|
|
|
/// Creates a stack slot in the function, to be used by `stack_load`, `stack_store` and
|
|
/// `stack_addr` instructions.
|
|
pub fn create_stack_slot(&mut self, data: StackSlotData) -> StackSlot {
|
|
self.func.create_stack_slot(data)
|
|
}
|
|
|
|
/// Adds a signature which can later be used to declare an external function import.
|
|
pub fn import_signature(&mut self, signature: Signature) -> SigRef {
|
|
self.func.import_signature(signature)
|
|
}
|
|
|
|
/// Declare an external function import.
|
|
pub fn import_function(&mut self, data: ExtFuncData) -> FuncRef {
|
|
self.func.import_function(data)
|
|
}
|
|
|
|
/// Declares a global value accessible to the function.
|
|
pub fn create_global_value(&mut self, data: GlobalValueData) -> GlobalValue {
|
|
self.func.create_global_value(data)
|
|
}
|
|
|
|
/// Declares a heap accessible to the function.
|
|
pub fn create_heap(&mut self, data: HeapData) -> Heap {
|
|
self.func.create_heap(data)
|
|
}
|
|
|
|
/// Returns an object with the [`InstBuilder`](cranelift_codegen::ir::InstBuilder)
|
|
/// trait that allows to conveniently append an instruction to the current `Block` being built.
|
|
pub fn ins<'short>(&'short mut self) -> FuncInstBuilder<'short, 'a> {
|
|
let block = self
|
|
.position
|
|
.expect("Please call switch_to_block before inserting instructions");
|
|
FuncInstBuilder::new(self, block)
|
|
}
|
|
|
|
/// Make sure that the current block is inserted in the layout.
|
|
pub fn ensure_inserted_block(&mut self) {
|
|
let block = self.position.unwrap();
|
|
if self.func_ctx.blocks[block].pristine {
|
|
if !self.func.layout.is_block_inserted(block) {
|
|
self.func.layout.append_block(block);
|
|
}
|
|
self.func_ctx.blocks[block].pristine = false;
|
|
} else {
|
|
debug_assert!(
|
|
!self.func_ctx.blocks[block].filled,
|
|
"you cannot add an instruction to a block already filled"
|
|
);
|
|
}
|
|
}
|
|
|
|
/// Returns a `FuncCursor` pointed at the current position ready for inserting instructions.
|
|
///
|
|
/// This can be used to insert SSA code that doesn't need to access locals and that doesn't
|
|
/// need to know about `FunctionBuilder` at all.
|
|
pub fn cursor(&mut self) -> FuncCursor {
|
|
self.ensure_inserted_block();
|
|
FuncCursor::new(self.func)
|
|
.with_srcloc(self.srcloc)
|
|
.at_bottom(self.position.unwrap())
|
|
}
|
|
|
|
/// Append parameters to the given `Block` corresponding to the function
|
|
/// parameters. This can be used to set up the block parameters for the
|
|
/// entry block.
|
|
pub fn append_block_params_for_function_params(&mut self, block: Block) {
|
|
debug_assert!(
|
|
!self.func_ctx.ssa.has_any_predecessors(block),
|
|
"block parameters for function parameters should only be added to the entry block"
|
|
);
|
|
|
|
// These parameters count as "user" parameters here because they aren't
|
|
// inserted by the SSABuilder.
|
|
let user_param_count = &mut self.func_ctx.blocks[block].user_param_count;
|
|
for argtyp in &self.func.signature.params {
|
|
*user_param_count += 1;
|
|
self.func.dfg.append_block_param(block, argtyp.value_type);
|
|
}
|
|
}
|
|
|
|
/// Append parameters to the given `Block` corresponding to the function
|
|
/// return values. This can be used to set up the block parameters for a
|
|
/// function exit block.
|
|
pub fn append_block_params_for_function_returns(&mut self, block: Block) {
|
|
// These parameters count as "user" parameters here because they aren't
|
|
// inserted by the SSABuilder.
|
|
let user_param_count = &mut self.func_ctx.blocks[block].user_param_count;
|
|
for argtyp in &self.func.signature.returns {
|
|
*user_param_count += 1;
|
|
self.func.dfg.append_block_param(block, argtyp.value_type);
|
|
}
|
|
}
|
|
|
|
/// Declare that translation of the current function is complete. This
|
|
/// resets the state of the `FunctionBuilder` in preparation to be used
|
|
/// for another function.
|
|
pub fn finalize(&mut self) {
|
|
// Check that all the `Block`s are filled and sealed.
|
|
#[cfg(debug_assertions)]
|
|
{
|
|
for (block, block_data) in self.func_ctx.blocks.iter() {
|
|
assert!(
|
|
block_data.pristine || self.func_ctx.ssa.is_sealed(block),
|
|
"FunctionBuilder finalized, but block {} is not sealed",
|
|
block,
|
|
);
|
|
assert!(
|
|
block_data.pristine || block_data.filled,
|
|
"FunctionBuilder finalized, but block {} is not filled",
|
|
block,
|
|
);
|
|
}
|
|
}
|
|
|
|
// In debug mode, check that all blocks are valid basic blocks.
|
|
#[cfg(debug_assertions)]
|
|
{
|
|
// Iterate manually to provide more helpful error messages.
|
|
for block in self.func_ctx.blocks.keys() {
|
|
if let Err((inst, _msg)) = self.func.is_block_basic(block) {
|
|
let inst_str = self.func.dfg.display_inst(inst, None);
|
|
panic!("{} failed basic block invariants on {}", block, inst_str);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Clear the state (but preserve the allocated buffers) in preparation
|
|
// for translation another function.
|
|
self.func_ctx.clear();
|
|
|
|
// Reset srcloc and position to initial states.
|
|
self.srcloc = Default::default();
|
|
self.position = Default::default();
|
|
}
|
|
}
|
|
|
|
/// All the functions documented in the previous block are write-only and help you build a valid
|
|
/// Cranelift IR functions via multiple debug asserts. However, you might need to improve the
|
|
/// performance of your translation perform more complex transformations to your Cranelift IR
|
|
/// function. The functions below help you inspect the function you're creating and modify it
|
|
/// in ways that can be unsafe if used incorrectly.
|
|
impl<'a> FunctionBuilder<'a> {
|
|
/// Retrieves all the parameters for a `Block` currently inferred from the jump instructions
|
|
/// inserted that target it and the SSA construction.
|
|
pub fn block_params(&self, block: Block) -> &[Value] {
|
|
self.func.dfg.block_params(block)
|
|
}
|
|
|
|
/// Retrieves the signature with reference `sigref` previously added with `import_signature`.
|
|
pub fn signature(&self, sigref: SigRef) -> Option<&Signature> {
|
|
self.func.dfg.signatures.get(sigref)
|
|
}
|
|
|
|
/// Creates a parameter for a specific `Block` by appending it to the list of already existing
|
|
/// parameters.
|
|
///
|
|
/// **Note:** this function has to be called at the creation of the `Block` before adding
|
|
/// instructions to it, otherwise this could interfere with SSA construction.
|
|
pub fn append_block_param(&mut self, block: Block, ty: Type) -> Value {
|
|
debug_assert!(
|
|
self.func_ctx.blocks[block].pristine,
|
|
"You can't add block parameters after adding any instruction"
|
|
);
|
|
debug_assert_eq!(
|
|
self.func_ctx.blocks[block].user_param_count,
|
|
self.func.dfg.num_block_params(block)
|
|
);
|
|
self.func_ctx.blocks[block].user_param_count += 1;
|
|
self.func.dfg.append_block_param(block, ty)
|
|
}
|
|
|
|
/// Returns the result values of an instruction.
|
|
pub fn inst_results(&self, inst: Inst) -> &[Value] {
|
|
self.func.dfg.inst_results(inst)
|
|
}
|
|
|
|
/// Changes the destination of a jump instruction after creation.
|
|
///
|
|
/// **Note:** You are responsible for maintaining the coherence with the arguments of
|
|
/// other jump instructions.
|
|
pub fn change_jump_destination(&mut self, inst: Inst, new_dest: Block) {
|
|
let old_dest = self.func.dfg[inst]
|
|
.branch_destination_mut()
|
|
.expect("you want to change the jump destination of a non-jump instruction");
|
|
let pred = self.func_ctx.ssa.remove_block_predecessor(*old_dest, inst);
|
|
*old_dest = new_dest;
|
|
self.func_ctx
|
|
.ssa
|
|
.declare_block_predecessor(new_dest, pred, inst);
|
|
}
|
|
|
|
/// Returns `true` if and only if the current `Block` is sealed and has no predecessors declared.
|
|
///
|
|
/// The entry block of a function is never unreachable.
|
|
pub fn is_unreachable(&self) -> bool {
|
|
let is_entry = match self.func.layout.entry_block() {
|
|
None => false,
|
|
Some(entry) => self.position.unwrap() == entry,
|
|
};
|
|
!is_entry
|
|
&& self.func_ctx.ssa.is_sealed(self.position.unwrap())
|
|
&& !self
|
|
.func_ctx
|
|
.ssa
|
|
.has_any_predecessors(self.position.unwrap())
|
|
}
|
|
|
|
/// Returns `true` if and only if no instructions have been added since the last call to
|
|
/// `switch_to_block`.
|
|
pub fn is_pristine(&self) -> bool {
|
|
self.func_ctx.blocks[self.position.unwrap()].pristine
|
|
}
|
|
|
|
/// Returns `true` if and only if a terminator instruction has been inserted since the
|
|
/// last call to `switch_to_block`.
|
|
pub fn is_filled(&self) -> bool {
|
|
self.func_ctx.blocks[self.position.unwrap()].filled
|
|
}
|
|
|
|
/// Returns a displayable object for the function as it is.
|
|
///
|
|
/// Useful for debug purposes. Use it with `None` for standard printing.
|
|
// Clippy thinks the lifetime that follows is needless, but rustc needs it
|
|
#[cfg_attr(feature = "cargo-clippy", allow(clippy::needless_lifetimes))]
|
|
pub fn display<'b, I: Into<Option<&'b dyn TargetIsa>>>(&'b self, isa: I) -> DisplayFunction {
|
|
self.func.display(isa)
|
|
}
|
|
}
|
|
|
|
/// Helper functions
|
|
impl<'a> FunctionBuilder<'a> {
|
|
/// Calls libc.memcpy
|
|
///
|
|
/// Copies the `size` bytes from `src` to `dest`, assumes that `src + size`
|
|
/// won't overlap onto `dest`. If `dest` and `src` overlap, the behavior is
|
|
/// undefined. Applications in which `dest` and `src` might overlap should
|
|
/// use `call_memmove` instead.
|
|
pub fn call_memcpy(
|
|
&mut self,
|
|
config: TargetFrontendConfig,
|
|
dest: Value,
|
|
src: Value,
|
|
size: Value,
|
|
) {
|
|
let pointer_type = config.pointer_type();
|
|
let signature = {
|
|
let mut s = Signature::new(config.default_call_conv);
|
|
s.params.push(AbiParam::new(pointer_type));
|
|
s.params.push(AbiParam::new(pointer_type));
|
|
s.params.push(AbiParam::new(pointer_type));
|
|
self.import_signature(s)
|
|
};
|
|
|
|
let libc_memcpy = self.import_function(ExtFuncData {
|
|
name: ExternalName::LibCall(LibCall::Memcpy),
|
|
signature,
|
|
colocated: false,
|
|
});
|
|
|
|
self.ins().call(libc_memcpy, &[dest, src, size]);
|
|
}
|
|
|
|
/// Optimised memcpy or memmove for small copies.
|
|
///
|
|
/// # Codegen safety
|
|
///
|
|
/// The following properties must hold to prevent UB:
|
|
///
|
|
/// * `src_align` and `dest_align` are an upper-bound on the alignment of `src` respectively `dest`.
|
|
/// * If `non_overlapping` is true, then this must be correct.
|
|
pub fn emit_small_memory_copy(
|
|
&mut self,
|
|
config: TargetFrontendConfig,
|
|
dest: Value,
|
|
src: Value,
|
|
size: u64,
|
|
dest_align: u8,
|
|
src_align: u8,
|
|
non_overlapping: bool,
|
|
) {
|
|
// Currently the result of guess work, not actual profiling.
|
|
const THRESHOLD: u64 = 4;
|
|
|
|
if size == 0 {
|
|
return;
|
|
}
|
|
|
|
let access_size = greatest_divisible_power_of_two(size);
|
|
assert!(
|
|
access_size.is_power_of_two(),
|
|
"`size` is not a power of two"
|
|
);
|
|
assert!(
|
|
access_size >= u64::from(::core::cmp::min(src_align, dest_align)),
|
|
"`size` is smaller than `dest` and `src`'s alignment value."
|
|
);
|
|
|
|
let (access_size, int_type) = if access_size <= 8 {
|
|
(access_size, Type::int((access_size * 8) as u16).unwrap())
|
|
} else {
|
|
(8, types::I64)
|
|
};
|
|
|
|
let load_and_store_amount = size / access_size;
|
|
|
|
if load_and_store_amount > THRESHOLD {
|
|
let size_value = self.ins().iconst(config.pointer_type(), size as i64);
|
|
if non_overlapping {
|
|
self.call_memcpy(config, dest, src, size_value);
|
|
} else {
|
|
self.call_memmove(config, dest, src, size_value);
|
|
}
|
|
return;
|
|
}
|
|
|
|
let mut flags = MemFlags::new();
|
|
flags.set_aligned();
|
|
|
|
// Load all of the memory first. This is necessary in case `dest` overlaps.
|
|
// It can also improve performance a bit.
|
|
let registers: smallvec::SmallVec<[_; THRESHOLD as usize]> = (0..load_and_store_amount)
|
|
.map(|i| {
|
|
let offset = (access_size * i) as i32;
|
|
(self.ins().load(int_type, flags, src, offset), offset)
|
|
})
|
|
.collect();
|
|
|
|
for (value, offset) in registers {
|
|
self.ins().store(flags, value, dest, offset);
|
|
}
|
|
}
|
|
|
|
/// Calls libc.memset
|
|
///
|
|
/// Writes `size` bytes of i8 value `ch` to memory starting at `buffer`.
|
|
pub fn call_memset(
|
|
&mut self,
|
|
config: TargetFrontendConfig,
|
|
buffer: Value,
|
|
ch: Value,
|
|
size: Value,
|
|
) {
|
|
let pointer_type = config.pointer_type();
|
|
let signature = {
|
|
let mut s = Signature::new(config.default_call_conv);
|
|
s.params.push(AbiParam::new(pointer_type));
|
|
s.params.push(AbiParam::new(types::I32));
|
|
s.params.push(AbiParam::new(pointer_type));
|
|
self.import_signature(s)
|
|
};
|
|
|
|
let libc_memset = self.import_function(ExtFuncData {
|
|
name: ExternalName::LibCall(LibCall::Memset),
|
|
signature,
|
|
colocated: false,
|
|
});
|
|
|
|
let ch = self.ins().uextend(types::I32, ch);
|
|
self.ins().call(libc_memset, &[buffer, ch, size]);
|
|
}
|
|
|
|
/// Calls libc.memset
|
|
///
|
|
/// Writes `size` bytes of value `ch` to memory starting at `buffer`.
|
|
pub fn emit_small_memset(
|
|
&mut self,
|
|
config: TargetFrontendConfig,
|
|
buffer: Value,
|
|
ch: u8,
|
|
size: u64,
|
|
buffer_align: u8,
|
|
) {
|
|
// Currently the result of guess work, not actual profiling.
|
|
const THRESHOLD: u64 = 4;
|
|
|
|
if size == 0 {
|
|
return;
|
|
}
|
|
|
|
let access_size = greatest_divisible_power_of_two(size);
|
|
assert!(
|
|
access_size.is_power_of_two(),
|
|
"`size` is not a power of two"
|
|
);
|
|
assert!(
|
|
access_size >= u64::from(buffer_align),
|
|
"`size` is smaller than `dest` and `src`'s alignment value."
|
|
);
|
|
|
|
let (access_size, int_type) = if access_size <= 8 {
|
|
(access_size, Type::int((access_size * 8) as u16).unwrap())
|
|
} else {
|
|
(8, types::I64)
|
|
};
|
|
|
|
let load_and_store_amount = size / access_size;
|
|
|
|
if load_and_store_amount > THRESHOLD {
|
|
let ch = self.ins().iconst(types::I8, i64::from(ch));
|
|
let size = self.ins().iconst(config.pointer_type(), size as i64);
|
|
self.call_memset(config, buffer, ch, size);
|
|
} else {
|
|
let mut flags = MemFlags::new();
|
|
flags.set_aligned();
|
|
|
|
let ch = u64::from(ch);
|
|
let raw_value = if int_type == types::I64 {
|
|
(ch << 32) | (ch << 16) | (ch << 8) | ch
|
|
} else if int_type == types::I32 {
|
|
(ch << 16) | (ch << 8) | ch
|
|
} else if int_type == types::I16 {
|
|
(ch << 8) | ch
|
|
} else {
|
|
assert_eq!(int_type, types::I8);
|
|
ch
|
|
};
|
|
|
|
let value = self.ins().iconst(int_type, raw_value as i64);
|
|
for i in 0..load_and_store_amount {
|
|
let offset = (access_size * i) as i32;
|
|
self.ins().store(flags, value, buffer, offset);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Calls libc.memmove
|
|
///
|
|
/// Copies `size` bytes from memory starting at `source` to memory starting
|
|
/// at `dest`. `source` is always read before writing to `dest`.
|
|
pub fn call_memmove(
|
|
&mut self,
|
|
config: TargetFrontendConfig,
|
|
dest: Value,
|
|
source: Value,
|
|
size: Value,
|
|
) {
|
|
let pointer_type = config.pointer_type();
|
|
let signature = {
|
|
let mut s = Signature::new(config.default_call_conv);
|
|
s.params.push(AbiParam::new(pointer_type));
|
|
s.params.push(AbiParam::new(pointer_type));
|
|
s.params.push(AbiParam::new(pointer_type));
|
|
self.import_signature(s)
|
|
};
|
|
|
|
let libc_memmove = self.import_function(ExtFuncData {
|
|
name: ExternalName::LibCall(LibCall::Memmove),
|
|
signature,
|
|
colocated: false,
|
|
});
|
|
|
|
self.ins().call(libc_memmove, &[dest, source, size]);
|
|
}
|
|
}
|
|
|
|
fn greatest_divisible_power_of_two(size: u64) -> u64 {
|
|
(size as i64 & -(size as i64)) as u64
|
|
}
|
|
|
|
// Helper functions
|
|
impl<'a> FunctionBuilder<'a> {
|
|
/// A Block is 'filled' when a terminator instruction is present.
|
|
fn fill_current_block(&mut self) {
|
|
self.func_ctx.blocks[self.position.unwrap()].filled = true;
|
|
}
|
|
|
|
fn declare_successor(&mut self, dest_block: Block, jump_inst: Inst) {
|
|
self.func_ctx
|
|
.ssa
|
|
.declare_block_predecessor(dest_block, self.position.unwrap(), jump_inst);
|
|
}
|
|
|
|
fn handle_ssa_side_effects(&mut self, side_effects: SideEffects) {
|
|
for split_block in side_effects.split_blocks_created {
|
|
self.func_ctx.blocks[split_block].filled = true
|
|
}
|
|
for modified_block in side_effects.instructions_added_to_blocks {
|
|
self.func_ctx.blocks[modified_block].pristine = false
|
|
}
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::greatest_divisible_power_of_two;
|
|
use crate::frontend::{FunctionBuilder, FunctionBuilderContext};
|
|
use crate::Variable;
|
|
use alloc::string::ToString;
|
|
use cranelift_codegen::entity::EntityRef;
|
|
use cranelift_codegen::ir::types::*;
|
|
use cranelift_codegen::ir::{AbiParam, ExternalName, Function, InstBuilder, Signature};
|
|
use cranelift_codegen::isa::CallConv;
|
|
use cranelift_codegen::settings;
|
|
use cranelift_codegen::verifier::verify_function;
|
|
|
|
fn sample_function(lazy_seal: bool) {
|
|
let mut sig = Signature::new(CallConv::SystemV);
|
|
sig.returns.push(AbiParam::new(I32));
|
|
sig.params.push(AbiParam::new(I32));
|
|
|
|
let mut fn_ctx = FunctionBuilderContext::new();
|
|
let mut func = Function::with_name_signature(ExternalName::testcase("sample"), sig);
|
|
{
|
|
let mut builder = FunctionBuilder::new(&mut func, &mut fn_ctx);
|
|
|
|
let block0 = builder.create_block();
|
|
let block1 = builder.create_block();
|
|
let block2 = builder.create_block();
|
|
let block3 = builder.create_block();
|
|
let x = Variable::new(0);
|
|
let y = Variable::new(1);
|
|
let z = Variable::new(2);
|
|
builder.declare_var(x, I32);
|
|
builder.declare_var(y, I32);
|
|
builder.declare_var(z, I32);
|
|
builder.append_block_params_for_function_params(block0);
|
|
|
|
builder.switch_to_block(block0);
|
|
if !lazy_seal {
|
|
builder.seal_block(block0);
|
|
}
|
|
{
|
|
let tmp = builder.block_params(block0)[0]; // the first function parameter
|
|
builder.def_var(x, tmp);
|
|
}
|
|
{
|
|
let tmp = builder.ins().iconst(I32, 2);
|
|
builder.def_var(y, tmp);
|
|
}
|
|
{
|
|
let arg1 = builder.use_var(x);
|
|
let arg2 = builder.use_var(y);
|
|
let tmp = builder.ins().iadd(arg1, arg2);
|
|
builder.def_var(z, tmp);
|
|
}
|
|
builder.ins().jump(block1, &[]);
|
|
|
|
builder.switch_to_block(block1);
|
|
{
|
|
let arg1 = builder.use_var(y);
|
|
let arg2 = builder.use_var(z);
|
|
let tmp = builder.ins().iadd(arg1, arg2);
|
|
builder.def_var(z, tmp);
|
|
}
|
|
{
|
|
let arg = builder.use_var(y);
|
|
builder.ins().brnz(arg, block3, &[]);
|
|
}
|
|
builder.ins().jump(block2, &[]);
|
|
|
|
builder.switch_to_block(block2);
|
|
if !lazy_seal {
|
|
builder.seal_block(block2);
|
|
}
|
|
{
|
|
let arg1 = builder.use_var(z);
|
|
let arg2 = builder.use_var(x);
|
|
let tmp = builder.ins().isub(arg1, arg2);
|
|
builder.def_var(z, tmp);
|
|
}
|
|
{
|
|
let arg = builder.use_var(y);
|
|
builder.ins().return_(&[arg]);
|
|
}
|
|
|
|
builder.switch_to_block(block3);
|
|
if !lazy_seal {
|
|
builder.seal_block(block3);
|
|
}
|
|
|
|
{
|
|
let arg1 = builder.use_var(y);
|
|
let arg2 = builder.use_var(x);
|
|
let tmp = builder.ins().isub(arg1, arg2);
|
|
builder.def_var(y, tmp);
|
|
}
|
|
builder.ins().jump(block1, &[]);
|
|
if !lazy_seal {
|
|
builder.seal_block(block1);
|
|
}
|
|
|
|
if lazy_seal {
|
|
builder.seal_all_blocks();
|
|
}
|
|
|
|
builder.finalize();
|
|
}
|
|
|
|
let flags = settings::Flags::new(settings::builder());
|
|
// println!("{}", func.display(None));
|
|
if let Err(errors) = verify_function(&func, &flags) {
|
|
panic!("{}\n{}", func.display(None), errors)
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn sample() {
|
|
sample_function(false)
|
|
}
|
|
|
|
#[test]
|
|
fn sample_with_lazy_seal() {
|
|
sample_function(true)
|
|
}
|
|
|
|
#[test]
|
|
fn memcpy() {
|
|
use core::str::FromStr;
|
|
use cranelift_codegen::{isa, settings};
|
|
|
|
let shared_builder = settings::builder();
|
|
let shared_flags = settings::Flags::new(shared_builder);
|
|
|
|
let triple =
|
|
::target_lexicon::Triple::from_str("x86_64").expect("Couldn't create x86_64 triple");
|
|
|
|
let target = isa::lookup(triple)
|
|
.ok()
|
|
.map(|b| b.finish(shared_flags))
|
|
.expect("This test requires x86_64 support.");
|
|
|
|
let mut sig = Signature::new(target.default_call_conv());
|
|
sig.returns.push(AbiParam::new(I32));
|
|
|
|
let mut fn_ctx = FunctionBuilderContext::new();
|
|
let mut func = Function::with_name_signature(ExternalName::testcase("sample"), sig);
|
|
{
|
|
let mut builder = FunctionBuilder::new(&mut func, &mut fn_ctx);
|
|
|
|
let block0 = builder.create_block();
|
|
let x = Variable::new(0);
|
|
let y = Variable::new(1);
|
|
let z = Variable::new(2);
|
|
builder.declare_var(x, target.pointer_type());
|
|
builder.declare_var(y, target.pointer_type());
|
|
builder.declare_var(z, I32);
|
|
builder.append_block_params_for_function_params(block0);
|
|
builder.switch_to_block(block0);
|
|
|
|
let src = builder.use_var(x);
|
|
let dest = builder.use_var(y);
|
|
let size = builder.use_var(y);
|
|
builder.call_memcpy(target.frontend_config(), dest, src, size);
|
|
builder.ins().return_(&[size]);
|
|
|
|
builder.seal_all_blocks();
|
|
builder.finalize();
|
|
}
|
|
|
|
assert_eq!(
|
|
func.display(None).to_string(),
|
|
"function %sample() -> i32 system_v {
|
|
sig0 = (i64, i64, i64) system_v
|
|
fn0 = %Memcpy sig0
|
|
|
|
block0:
|
|
v3 = iconst.i64 0
|
|
v1 -> v3
|
|
v2 = iconst.i64 0
|
|
v0 -> v2
|
|
call fn0(v1, v0, v1)
|
|
return v1
|
|
}
|
|
"
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn small_memcpy() {
|
|
use core::str::FromStr;
|
|
use cranelift_codegen::{isa, settings};
|
|
|
|
let shared_builder = settings::builder();
|
|
let shared_flags = settings::Flags::new(shared_builder);
|
|
|
|
let triple =
|
|
::target_lexicon::Triple::from_str("x86_64").expect("Couldn't create x86_64 triple");
|
|
|
|
let target = isa::lookup(triple)
|
|
.ok()
|
|
.map(|b| b.finish(shared_flags))
|
|
.expect("This test requires x86_64 support.");
|
|
|
|
let mut sig = Signature::new(target.default_call_conv());
|
|
sig.returns.push(AbiParam::new(I32));
|
|
|
|
let mut fn_ctx = FunctionBuilderContext::new();
|
|
let mut func = Function::with_name_signature(ExternalName::testcase("sample"), sig);
|
|
{
|
|
let mut builder = FunctionBuilder::new(&mut func, &mut fn_ctx);
|
|
|
|
let block0 = builder.create_block();
|
|
let x = Variable::new(0);
|
|
let y = Variable::new(16);
|
|
builder.declare_var(x, target.pointer_type());
|
|
builder.declare_var(y, target.pointer_type());
|
|
builder.append_block_params_for_function_params(block0);
|
|
builder.switch_to_block(block0);
|
|
|
|
let src = builder.use_var(x);
|
|
let dest = builder.use_var(y);
|
|
let size = 8;
|
|
builder.emit_small_memory_copy(target.frontend_config(), dest, src, size, 8, 8, true);
|
|
builder.ins().return_(&[dest]);
|
|
|
|
builder.seal_all_blocks();
|
|
builder.finalize();
|
|
}
|
|
|
|
assert_eq!(
|
|
func.display(None).to_string(),
|
|
"function %sample() -> i32 system_v {
|
|
block0:
|
|
v4 = iconst.i64 0
|
|
v1 -> v4
|
|
v3 = iconst.i64 0
|
|
v0 -> v3
|
|
v2 = load.i64 aligned v0
|
|
store aligned v2, v1
|
|
return v1
|
|
}
|
|
"
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn not_so_small_memcpy() {
|
|
use core::str::FromStr;
|
|
use cranelift_codegen::{isa, settings};
|
|
|
|
let shared_builder = settings::builder();
|
|
let shared_flags = settings::Flags::new(shared_builder);
|
|
|
|
let triple =
|
|
::target_lexicon::Triple::from_str("x86_64").expect("Couldn't create x86_64 triple");
|
|
|
|
let target = isa::lookup(triple)
|
|
.ok()
|
|
.map(|b| b.finish(shared_flags))
|
|
.expect("This test requires x86_64 support.");
|
|
|
|
let mut sig = Signature::new(target.default_call_conv());
|
|
sig.returns.push(AbiParam::new(I32));
|
|
|
|
let mut fn_ctx = FunctionBuilderContext::new();
|
|
let mut func = Function::with_name_signature(ExternalName::testcase("sample"), sig);
|
|
{
|
|
let mut builder = FunctionBuilder::new(&mut func, &mut fn_ctx);
|
|
|
|
let block0 = builder.create_block();
|
|
let x = Variable::new(0);
|
|
let y = Variable::new(16);
|
|
builder.declare_var(x, target.pointer_type());
|
|
builder.declare_var(y, target.pointer_type());
|
|
builder.append_block_params_for_function_params(block0);
|
|
builder.switch_to_block(block0);
|
|
|
|
let src = builder.use_var(x);
|
|
let dest = builder.use_var(y);
|
|
let size = 8192;
|
|
builder.emit_small_memory_copy(target.frontend_config(), dest, src, size, 8, 8, true);
|
|
builder.ins().return_(&[dest]);
|
|
|
|
builder.seal_all_blocks();
|
|
builder.finalize();
|
|
}
|
|
|
|
assert_eq!(
|
|
func.display(None).to_string(),
|
|
"function %sample() -> i32 system_v {
|
|
sig0 = (i64, i64, i64) system_v
|
|
fn0 = %Memcpy sig0
|
|
|
|
block0:
|
|
v4 = iconst.i64 0
|
|
v1 -> v4
|
|
v3 = iconst.i64 0
|
|
v0 -> v3
|
|
v2 = iconst.i64 8192
|
|
call fn0(v1, v0, v2)
|
|
return v1
|
|
}
|
|
"
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn small_memset() {
|
|
use core::str::FromStr;
|
|
use cranelift_codegen::{isa, settings};
|
|
|
|
let shared_builder = settings::builder();
|
|
let shared_flags = settings::Flags::new(shared_builder);
|
|
|
|
let triple =
|
|
::target_lexicon::Triple::from_str("x86_64").expect("Couldn't create x86_64 triple");
|
|
|
|
let target = isa::lookup(triple)
|
|
.ok()
|
|
.map(|b| b.finish(shared_flags))
|
|
.expect("This test requires x86_64 support.");
|
|
|
|
let mut sig = Signature::new(target.default_call_conv());
|
|
sig.returns.push(AbiParam::new(I32));
|
|
|
|
let mut fn_ctx = FunctionBuilderContext::new();
|
|
let mut func = Function::with_name_signature(ExternalName::testcase("sample"), sig);
|
|
{
|
|
let mut builder = FunctionBuilder::new(&mut func, &mut fn_ctx);
|
|
|
|
let block0 = builder.create_block();
|
|
let y = Variable::new(16);
|
|
builder.declare_var(y, target.pointer_type());
|
|
builder.append_block_params_for_function_params(block0);
|
|
builder.switch_to_block(block0);
|
|
|
|
let dest = builder.use_var(y);
|
|
let size = 8;
|
|
builder.emit_small_memset(target.frontend_config(), dest, 1, size, 8);
|
|
builder.ins().return_(&[dest]);
|
|
|
|
builder.seal_all_blocks();
|
|
builder.finalize();
|
|
}
|
|
|
|
assert_eq!(
|
|
func.display(None).to_string(),
|
|
"function %sample() -> i32 system_v {
|
|
block0:
|
|
v2 = iconst.i64 0
|
|
v0 -> v2
|
|
v1 = iconst.i64 0x0001_0001_0101
|
|
store aligned v1, v0
|
|
return v0
|
|
}
|
|
"
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn not_so_small_memset() {
|
|
use core::str::FromStr;
|
|
use cranelift_codegen::{isa, settings};
|
|
|
|
let shared_builder = settings::builder();
|
|
let shared_flags = settings::Flags::new(shared_builder);
|
|
|
|
let triple =
|
|
::target_lexicon::Triple::from_str("x86_64").expect("Couldn't create x86_64 triple");
|
|
|
|
let target = isa::lookup(triple)
|
|
.ok()
|
|
.map(|b| b.finish(shared_flags))
|
|
.expect("This test requires x86_64 support.");
|
|
|
|
let mut sig = Signature::new(target.default_call_conv());
|
|
sig.returns.push(AbiParam::new(I32));
|
|
|
|
let mut fn_ctx = FunctionBuilderContext::new();
|
|
let mut func = Function::with_name_signature(ExternalName::testcase("sample"), sig);
|
|
{
|
|
let mut builder = FunctionBuilder::new(&mut func, &mut fn_ctx);
|
|
|
|
let block0 = builder.create_block();
|
|
let y = Variable::new(16);
|
|
builder.declare_var(y, target.pointer_type());
|
|
builder.append_block_params_for_function_params(block0);
|
|
builder.switch_to_block(block0);
|
|
|
|
let dest = builder.use_var(y);
|
|
let size = 8192;
|
|
builder.emit_small_memset(target.frontend_config(), dest, 1, size, 8);
|
|
builder.ins().return_(&[dest]);
|
|
|
|
builder.seal_all_blocks();
|
|
builder.finalize();
|
|
}
|
|
|
|
assert_eq!(
|
|
func.display(None).to_string(),
|
|
"function %sample() -> i32 system_v {
|
|
sig0 = (i64, i32, i64) system_v
|
|
fn0 = %Memset sig0
|
|
|
|
block0:
|
|
v4 = iconst.i64 0
|
|
v0 -> v4
|
|
v1 = iconst.i8 1
|
|
v2 = iconst.i64 8192
|
|
v3 = uextend.i32 v1
|
|
call fn0(v0, v3, v2)
|
|
return v0
|
|
}
|
|
"
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn undef_vector_vars() {
|
|
let mut sig = Signature::new(CallConv::SystemV);
|
|
sig.returns.push(AbiParam::new(I8X16));
|
|
sig.returns.push(AbiParam::new(B8X16));
|
|
sig.returns.push(AbiParam::new(F32X4));
|
|
|
|
let mut fn_ctx = FunctionBuilderContext::new();
|
|
let mut func = Function::with_name_signature(ExternalName::testcase("sample"), sig);
|
|
{
|
|
let mut builder = FunctionBuilder::new(&mut func, &mut fn_ctx);
|
|
|
|
let block0 = builder.create_block();
|
|
let a = Variable::new(0);
|
|
let b = Variable::new(1);
|
|
let c = Variable::new(2);
|
|
builder.declare_var(a, I8X16);
|
|
builder.declare_var(b, B8X16);
|
|
builder.declare_var(c, F32X4);
|
|
builder.switch_to_block(block0);
|
|
|
|
let a = builder.use_var(a);
|
|
let b = builder.use_var(b);
|
|
let c = builder.use_var(c);
|
|
builder.ins().return_(&[a, b, c]);
|
|
|
|
builder.seal_all_blocks();
|
|
builder.finalize();
|
|
}
|
|
|
|
assert_eq!(
|
|
func.display(None).to_string(),
|
|
"function %sample() -> i8x16, b8x16, f32x4 system_v {
|
|
const0 = 0x00000000000000000000000000000000
|
|
|
|
block0:
|
|
v5 = f32const 0.0
|
|
v6 = splat.f32x4 v5
|
|
v2 -> v6
|
|
v4 = vconst.b8x16 const0
|
|
v1 -> v4
|
|
v3 = vconst.i8x16 const0
|
|
v0 -> v3
|
|
return v0, v1, v2
|
|
}
|
|
"
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_greatest_divisible_power_of_two() {
|
|
assert_eq!(64, greatest_divisible_power_of_two(64));
|
|
assert_eq!(16, greatest_divisible_power_of_two(48));
|
|
assert_eq!(8, greatest_divisible_power_of_two(24));
|
|
assert_eq!(1, greatest_divisible_power_of_two(25));
|
|
}
|
|
}
|