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Move condcodes.rs to a new crate, cranelift-codegen-shared

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This move allows the `IntCC`/`FloatCC` enums to be used in both meta (for predicate matching) and in codegen. To avoid breaking any code dependent on the previous location of condcodes.rs (`cranelift-codegen/src/condcodes.rs`), the module is re-exported under `cranelift_codegen::ir`.
This commit is contained in:
Andrew Brown
2019-09-23 11:04:50 -07:00
parent a3db30d97e
commit c648fa3d06
9 changed files with 264 additions and 3 deletions
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cranelift/codegen/shared/Cargo.toml Normal file
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[package]
authors = ["The Cranelift Project Developers"]
name = "cranelift-codegen-shared"
version = "0.43.1"
description = "For code shared between cranelift-codegen-meta and cranelift-codegen"
license = "Apache-2.0 WITH LLVM-exception"
repository = "https://github.com/CraneStation/cranelift"
readme = "README.md"
edition = "2018"
[dependencies]

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This crate contains shared definitions for use in both `cranelift-codegen-meta` and `cranelift
-codegen`.

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cranelift/codegen/shared/src/condcodes.rs Normal file
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//! Condition codes for the Cranelift code generator.
//!
//! A condition code here is an enumerated type that determined how to compare two numbers. There
//! are different rules for comparing integers and floating point numbers, so they use different
//! condition codes.
use core::fmt::{self, Display, Formatter};
use core::str::FromStr;
/// Common traits of condition codes.
pub trait CondCode: Copy {
/// Get the inverse condition code of `self`.
///
/// The inverse condition code produces the opposite result for all comparisons.
/// That is, `cmp CC, x, y` is true if and only if `cmp CC.inverse(), x, y` is false.
#[must_use]
fn inverse(self) -> Self;
/// Get the reversed condition code for `self`.
///
/// The reversed condition code produces the same result as swapping `x` and `y` in the
/// comparison. That is, `cmp CC, x, y` is the same as `cmp CC.reverse(), y, x`.
#[must_use]
fn reverse(self) -> Self;
}
/// Condition code for comparing integers.
///
/// This condition code is used by the `icmp` instruction to compare integer values. There are
/// separate codes for comparing the integers as signed or unsigned numbers where it makes a
/// difference.
#[derive(Clone, Copy, PartialEq, Eq, Debug, Hash)]
pub enum IntCC {
/// `==`.
Equal,
/// `!=`.
NotEqual,
/// Signed `<`.
SignedLessThan,
/// Signed `>=`.
SignedGreaterThanOrEqual,
/// Signed `>`.
SignedGreaterThan,
/// Signed `<=`.
SignedLessThanOrEqual,
/// Unsigned `<`.
UnsignedLessThan,
/// Unsigned `>=`.
UnsignedGreaterThanOrEqual,
/// Unsigned `>`.
UnsignedGreaterThan,
/// Unsigned `<=`.
UnsignedLessThanOrEqual,
}
impl CondCode for IntCC {
fn inverse(self) -> Self {
use self::IntCC::*;
match self {
Equal => NotEqual,
NotEqual => Equal,
SignedLessThan => SignedGreaterThanOrEqual,
SignedGreaterThanOrEqual => SignedLessThan,
SignedGreaterThan => SignedLessThanOrEqual,
SignedLessThanOrEqual => SignedGreaterThan,
UnsignedLessThan => UnsignedGreaterThanOrEqual,
UnsignedGreaterThanOrEqual => UnsignedLessThan,
UnsignedGreaterThan => UnsignedLessThanOrEqual,
UnsignedLessThanOrEqual => UnsignedGreaterThan,
}
}
fn reverse(self) -> Self {
use self::IntCC::*;
match self {
Equal => Equal,
NotEqual => NotEqual,
SignedGreaterThan => SignedLessThan,
SignedGreaterThanOrEqual => SignedLessThanOrEqual,
SignedLessThan => SignedGreaterThan,
SignedLessThanOrEqual => SignedGreaterThanOrEqual,
UnsignedGreaterThan => UnsignedLessThan,
UnsignedGreaterThanOrEqual => UnsignedLessThanOrEqual,
UnsignedLessThan => UnsignedGreaterThan,
UnsignedLessThanOrEqual => UnsignedGreaterThanOrEqual,
}
}
}
impl Display for IntCC {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
use self::IntCC::*;
f.write_str(match *self {
Equal => "eq",
NotEqual => "ne",
SignedGreaterThan => "sgt",
SignedGreaterThanOrEqual => "sge",
SignedLessThan => "slt",
SignedLessThanOrEqual => "sle",
UnsignedGreaterThan => "ugt",
UnsignedGreaterThanOrEqual => "uge",
UnsignedLessThan => "ult",
UnsignedLessThanOrEqual => "ule",
})
}
}
impl FromStr for IntCC {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
use self::IntCC::*;
match s {
"eq" => Ok(Equal),
"ne" => Ok(NotEqual),
"sge" => Ok(SignedGreaterThanOrEqual),
"sgt" => Ok(SignedGreaterThan),
"sle" => Ok(SignedLessThanOrEqual),
"slt" => Ok(SignedLessThan),
"uge" => Ok(UnsignedGreaterThanOrEqual),
"ugt" => Ok(UnsignedGreaterThan),
"ule" => Ok(UnsignedLessThanOrEqual),
"ult" => Ok(UnsignedLessThan),
_ => Err(()),
}
}
}
/// Condition code for comparing floating point numbers.
///
/// This condition code is used by the `fcmp` instruction to compare floating point values. Two
/// IEEE floating point values relate in exactly one of four ways:
///
/// 1. `UN` - unordered when either value is NaN.
/// 2. `EQ` - equal numerical value.
/// 3. `LT` - `x` is less than `y`.
/// 4. `GT` - `x` is greater than `y`.
///
/// Note that `0.0` and `-0.0` relate as `EQ` because they both represent the number 0.
///
/// The condition codes described here are used to produce a single boolean value from the
/// comparison. The 14 condition codes here cover every possible combination of the relation above
/// except the impossible `!UN & !EQ & !LT & !GT` and the always true `UN | EQ | LT | GT`.
#[derive(Clone, Copy, PartialEq, Eq, Debug, Hash)]
pub enum FloatCC {
/// EQ | LT | GT
Ordered,
/// UN
Unordered,
/// EQ
Equal,
/// The C '!=' operator is the inverse of '==': `NotEqual`.
/// UN | LT | GT
NotEqual,
/// LT | GT
OrderedNotEqual,
/// UN | EQ
UnorderedOrEqual,
/// LT
LessThan,
/// LT | EQ
LessThanOrEqual,
/// GT
GreaterThan,
/// GT | EQ
GreaterThanOrEqual,
/// UN | LT
UnorderedOrLessThan,
/// UN | LT | EQ
UnorderedOrLessThanOrEqual,
/// UN | GT
UnorderedOrGreaterThan,
/// UN | GT | EQ
UnorderedOrGreaterThanOrEqual,
}
impl CondCode for FloatCC {
fn inverse(self) -> Self {
use self::FloatCC::*;
match self {
Ordered => Unordered,
Unordered => Ordered,
Equal => NotEqual,
NotEqual => Equal,
OrderedNotEqual => UnorderedOrEqual,
UnorderedOrEqual => OrderedNotEqual,
LessThan => UnorderedOrGreaterThanOrEqual,
LessThanOrEqual => UnorderedOrGreaterThan,
GreaterThan => UnorderedOrLessThanOrEqual,
GreaterThanOrEqual => UnorderedOrLessThan,
UnorderedOrLessThan => GreaterThanOrEqual,
UnorderedOrLessThanOrEqual => GreaterThan,
UnorderedOrGreaterThan => LessThanOrEqual,
UnorderedOrGreaterThanOrEqual => LessThan,
}
}
fn reverse(self) -> Self {
use self::FloatCC::*;
match self {
Ordered => Ordered,
Unordered => Unordered,
Equal => Equal,
NotEqual => NotEqual,
OrderedNotEqual => OrderedNotEqual,
UnorderedOrEqual => UnorderedOrEqual,
LessThan => GreaterThan,
LessThanOrEqual => GreaterThanOrEqual,
GreaterThan => LessThan,
GreaterThanOrEqual => LessThanOrEqual,
UnorderedOrLessThan => UnorderedOrGreaterThan,
UnorderedOrLessThanOrEqual => UnorderedOrGreaterThanOrEqual,
UnorderedOrGreaterThan => UnorderedOrLessThan,
UnorderedOrGreaterThanOrEqual => UnorderedOrLessThanOrEqual,
}
}
}
impl Display for FloatCC {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
use self::FloatCC::*;
f.write_str(match *self {
Ordered => "ord",
Unordered => "uno",
Equal => "eq",
NotEqual => "ne",
OrderedNotEqual => "one",
UnorderedOrEqual => "ueq",
LessThan => "lt",
LessThanOrEqual => "le",
GreaterThan => "gt",
GreaterThanOrEqual => "ge",
UnorderedOrLessThan => "ult",
UnorderedOrLessThanOrEqual => "ule",
UnorderedOrGreaterThan => "ugt",
UnorderedOrGreaterThanOrEqual => "uge",
})
}
}
impl FromStr for FloatCC {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
use self::FloatCC::*;
match s {
"ord" => Ok(Ordered),
"uno" => Ok(Unordered),
"eq" => Ok(Equal),
"ne" => Ok(NotEqual),
"one" => Ok(OrderedNotEqual),
"ueq" => Ok(UnorderedOrEqual),
"lt" => Ok(LessThan),
"le" => Ok(LessThanOrEqual),
"gt" => Ok(GreaterThan),
"ge" => Ok(GreaterThanOrEqual),
"ult" => Ok(UnorderedOrLessThan),
"ule" => Ok(UnorderedOrLessThanOrEqual),
"ugt" => Ok(UnorderedOrGreaterThan),
"uge" => Ok(UnorderedOrGreaterThanOrEqual),
_ => Err(()),
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use std::string::ToString;
static INT_ALL: [IntCC; 10] = [
IntCC::Equal,
IntCC::NotEqual,
IntCC::SignedLessThan,
IntCC::SignedGreaterThanOrEqual,
IntCC::SignedGreaterThan,
IntCC::SignedLessThanOrEqual,
IntCC::UnsignedLessThan,
IntCC::UnsignedGreaterThanOrEqual,
IntCC::UnsignedGreaterThan,
IntCC::UnsignedLessThanOrEqual,
];
#[test]
fn int_inverse() {
for r in &INT_ALL {
let cc = *r;
let inv = cc.inverse();
assert!(cc != inv);
assert_eq!(inv.inverse(), cc);
}
}
#[test]
fn int_reverse() {
for r in &INT_ALL {
let cc = *r;
let rev = cc.reverse();
assert_eq!(rev.reverse(), cc);
}
}
#[test]
fn int_display() {
for r in &INT_ALL {
let cc = *r;
assert_eq!(cc.to_string().parse(), Ok(cc));
}
assert_eq!("bogus".parse::<IntCC>(), Err(()));
}
static FLOAT_ALL: [FloatCC; 14] = [
FloatCC::Ordered,
FloatCC::Unordered,
FloatCC::Equal,
FloatCC::NotEqual,
FloatCC::OrderedNotEqual,
FloatCC::UnorderedOrEqual,
FloatCC::LessThan,
FloatCC::LessThanOrEqual,
FloatCC::GreaterThan,
FloatCC::GreaterThanOrEqual,
FloatCC::UnorderedOrLessThan,
FloatCC::UnorderedOrLessThanOrEqual,
FloatCC::UnorderedOrGreaterThan,
FloatCC::UnorderedOrGreaterThanOrEqual,
];
#[test]
fn float_inverse() {
for r in &FLOAT_ALL {
let cc = *r;
let inv = cc.inverse();
assert!(cc != inv);
assert_eq!(inv.inverse(), cc);
}
}
#[test]
fn float_reverse() {
for r in &FLOAT_ALL {
let cc = *r;
let rev = cc.reverse();
assert_eq!(rev.reverse(), cc);
}
}
#[test]
fn float_display() {
for r in &FLOAT_ALL {
let cc = *r;
assert_eq!(cc.to_string().parse(), Ok(cc));
}
assert_eq!("bogus".parse::<FloatCC>(), Err(()));
}
}

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//! This library contains code that is common to both the `cranelift-codegen` and
//! `cranelift-codegen-meta` libraries.
#![deny(missing_docs, trivial_numeric_casts, unused_extern_crates)]
#![warn(unused_import_braces)]
#![cfg_attr(feature = "std", deny(unstable_features))]
#![cfg_attr(feature = "clippy", plugin(clippy(conf_file = "../../clippy.toml")))]
#![cfg_attr(feature = "cargo-clippy", allow(clippy::new_without_default))]
#![cfg_attr(
feature = "cargo-clippy",
warn(
clippy::float_arithmetic,
clippy::mut_mut,
clippy::nonminimal_bool,
clippy::option_map_unwrap_or,
clippy::option_map_unwrap_or_else,
clippy::print_stdout,
clippy::unicode_not_nfc,
clippy::use_self
)
)]
pub mod condcodes;
/// Version number of this crate.
pub const VERSION: &str = env!("CARGO_PKG_VERSION");