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Diffstat (limited to 'third_party/rust/itoa')
| -rw-r--r-- | third_party/rust/itoa/.cargo-checksum.json | 1 | ||||
| -rw-r--r-- | third_party/rust/itoa/Cargo.toml | 38 | ||||
| -rw-r--r-- | third_party/rust/itoa/LICENSE-APACHE | 201 | ||||
| -rw-r--r-- | third_party/rust/itoa/LICENSE-MIT | 23 | ||||
| -rw-r--r-- | third_party/rust/itoa/README.md | 59 | ||||
| -rw-r--r-- | third_party/rust/itoa/benches/bench.rs | 55 | ||||
| -rw-r--r-- | third_party/rust/itoa/src/lib.rs | 290 | ||||
| -rw-r--r-- | third_party/rust/itoa/src/udiv128.rs | 48 | ||||
| -rw-r--r-- | third_party/rust/itoa/tests/test.rs | 29 |
9 files changed, 744 insertions, 0 deletions
diff --git a/third_party/rust/itoa/.cargo-checksum.json b/third_party/rust/itoa/.cargo-checksum.json new file mode 100644 index 0000000000..5ab0879bba --- /dev/null +++ b/third_party/rust/itoa/.cargo-checksum.json @@ -0,0 +1 @@ +{"files":{"Cargo.toml":"bb96760f2d45e86313dbec93a3210e5073c4ee74116097bb5ca45ba9c5b049a6","LICENSE-APACHE":"a60eea817514531668d7e00765731449fe14d059d3249e0bc93b36de45f759f2","LICENSE-MIT":"23f18e03dc49df91622fe2a76176497404e46ced8a715d9d2b67a7446571cca3","README.md":"48573443063fa4e0786c3b46f42b6efd1f171c6b73408a64afc1b34de89f31fe","benches/bench.rs":"636f3093bd461210ad3063289d455f90669c4a1be3273bcd30898de39f02c641","src/lib.rs":"da13f0d5dcba3bb2971f67b6856ea6f2e3cbdc31d47f7042d7f131b08bb7de85","src/udiv128.rs":"d28c1872c37ee2185931babcb20a221b8706a5aa8abc4963419763888023ff17","tests/test.rs":"f7404fc5f7cd1bdaf74a3b64a70d5b30586241ddc1ce2c82bd1b564999fcce0e"},"package":"fad582f4b9e86b6caa621cabeb0963332d92eea04729ab12892c2533951e6440"}
\ No newline at end of file diff --git a/third_party/rust/itoa/Cargo.toml b/third_party/rust/itoa/Cargo.toml new file mode 100644 index 0000000000..86c10b6446 --- /dev/null +++ b/third_party/rust/itoa/Cargo.toml @@ -0,0 +1,38 @@ +# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO +# +# When uploading crates to the registry Cargo will automatically +# "normalize" Cargo.toml files for maximal compatibility +# with all versions of Cargo and also rewrite `path` dependencies +# to registry (e.g., crates.io) dependencies. +# +# If you are reading this file be aware that the original Cargo.toml +# will likely look very different (and much more reasonable). +# See Cargo.toml.orig for the original contents. + +[package] +edition = "2018" +rust-version = "1.36" +name = "itoa" +version = "1.0.5" +authors = ["David Tolnay <dtolnay@gmail.com>"] +exclude = [ + "performance.png", + "chart/**", +] +description = "Fast integer primitive to string conversion" +documentation = "https://docs.rs/itoa" +readme = "README.md" +keywords = ["integer"] +categories = [ + "value-formatting", + "no-std", +] +license = "MIT OR Apache-2.0" +repository = "https://github.com/dtolnay/itoa" + +[package.metadata.docs.rs] +targets = ["x86_64-unknown-linux-gnu"] + +[dependencies.no-panic] +version = "0.1" +optional = true diff --git a/third_party/rust/itoa/LICENSE-APACHE b/third_party/rust/itoa/LICENSE-APACHE new file mode 100644 index 0000000000..16fe87b06e --- /dev/null +++ b/third_party/rust/itoa/LICENSE-APACHE @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + +TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + +1. 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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. diff --git a/third_party/rust/itoa/README.md b/third_party/rust/itoa/README.md new file mode 100644 index 0000000000..5728fb726f --- /dev/null +++ b/third_party/rust/itoa/README.md @@ -0,0 +1,59 @@ +itoa +==== + +[<img alt="github" src="https://img.shields.io/badge/github-dtolnay/itoa-8da0cb?style=for-the-badge&labelColor=555555&logo=github" height="20">](https://github.com/dtolnay/itoa) +[<img alt="crates.io" src="https://img.shields.io/crates/v/itoa.svg?style=for-the-badge&color=fc8d62&logo=rust" height="20">](https://crates.io/crates/itoa) +[<img alt="docs.rs" src="https://img.shields.io/badge/docs.rs-itoa-66c2a5?style=for-the-badge&labelColor=555555&logo=docs.rs" height="20">](https://docs.rs/itoa) +[<img alt="build status" src="https://img.shields.io/github/actions/workflow/status/dtolnay/itoa/ci.yml?branch=master&style=for-the-badge" height="20">](https://github.com/dtolnay/itoa/actions?query=branch%3Amaster) + +This crate provides a fast conversion of integer primitives to decimal strings. +The implementation comes straight from [libcore] but avoids the performance +penalty of going through [`core::fmt::Formatter`]. + +See also [`ryu`] for printing floating point primitives. + +*Version requirement: rustc 1.36+* + +[libcore]: https://github.com/rust-lang/rust/blob/b8214dc6c6fc20d0a660fb5700dca9ebf51ebe89/src/libcore/fmt/num.rs#L201-L254 +[`core::fmt::Formatter`]: https://doc.rust-lang.org/std/fmt/struct.Formatter.html +[`ryu`]: https://github.com/dtolnay/ryu + +```toml +[dependencies] +itoa = "1.0" +``` + +<br> + +## Example + +```rust +fn main() { + let mut buffer = itoa::Buffer::new(); + let printed = buffer.format(128u64); + assert_eq!(printed, "128"); +} +``` + +<br> + +## Performance (lower is better) + + + +<br> + +#### License + +<sup> +Licensed under either of <a href="LICENSE-APACHE">Apache License, Version +2.0</a> or <a href="LICENSE-MIT">MIT license</a> at your option. +</sup> + +<br> + +<sub> +Unless you explicitly state otherwise, any contribution intentionally submitted +for inclusion in this crate by you, as defined in the Apache-2.0 license, shall +be dual licensed as above, without any additional terms or conditions. +</sub> diff --git a/third_party/rust/itoa/benches/bench.rs b/third_party/rust/itoa/benches/bench.rs new file mode 100644 index 0000000000..acd2a0c1e8 --- /dev/null +++ b/third_party/rust/itoa/benches/bench.rs @@ -0,0 +1,55 @@ +#![feature(test)] +#![allow(non_snake_case)] +#![allow(clippy::cast_lossless)] + +extern crate test; + +macro_rules! benches { + ($($name:ident($value:expr))*) => { + mod bench_itoa_format { + use test::{Bencher, black_box}; + + $( + #[bench] + fn $name(b: &mut Bencher) { + let mut buffer = itoa::Buffer::new(); + + b.iter(|| { + let printed = buffer.format(black_box($value)); + black_box(printed); + }); + } + )* + } + + mod bench_std_fmt { + use std::io::Write; + use test::{Bencher, black_box}; + + $( + #[bench] + fn $name(b: &mut Bencher) { + let mut buf = Vec::with_capacity(40); + + b.iter(|| { + buf.clear(); + write!(&mut buf, "{}", black_box($value)).unwrap(); + black_box(&buf); + }); + } + )* + } + } +} + +benches! { + bench_u64_0(0u64) + bench_u64_half(u32::max_value() as u64) + bench_u64_max(u64::max_value()) + + bench_i16_0(0i16) + bench_i16_min(i16::min_value()) + + bench_u128_0(0u128) + bench_u128_max(u128::max_value()) +} diff --git a/third_party/rust/itoa/src/lib.rs b/third_party/rust/itoa/src/lib.rs new file mode 100644 index 0000000000..168407f061 --- /dev/null +++ b/third_party/rust/itoa/src/lib.rs @@ -0,0 +1,290 @@ +//! [![github]](https://github.com/dtolnay/itoa) [![crates-io]](https://crates.io/crates/itoa) [![docs-rs]](https://docs.rs/itoa) +//! +//! [github]: https://img.shields.io/badge/github-8da0cb?style=for-the-badge&labelColor=555555&logo=github +//! [crates-io]: https://img.shields.io/badge/crates.io-fc8d62?style=for-the-badge&labelColor=555555&logo=rust +//! [docs-rs]: https://img.shields.io/badge/docs.rs-66c2a5?style=for-the-badge&labelColor=555555&logo=docs.rs +//! +//! <br> +//! +//! This crate provides a fast conversion of integer primitives to decimal +//! strings. The implementation comes straight from [libcore] but avoids the +//! performance penalty of going through [`core::fmt::Formatter`]. +//! +//! See also [`ryu`] for printing floating point primitives. +//! +//! [libcore]: https://github.com/rust-lang/rust/blob/b8214dc6c6fc20d0a660fb5700dca9ebf51ebe89/src/libcore/fmt/num.rs#L201-L254 +//! [`core::fmt::Formatter`]: https://doc.rust-lang.org/std/fmt/struct.Formatter.html +//! [`ryu`]: https://github.com/dtolnay/ryu +//! +//! # Example +//! +//! ``` +//! fn main() { +//! let mut buffer = itoa::Buffer::new(); +//! let printed = buffer.format(128u64); +//! assert_eq!(printed, "128"); +//! } +//! ``` +//! +//! # Performance (lower is better) +//! +//!  + +#![doc(html_root_url = "https://docs.rs/itoa/1.0.5")] +#![no_std] +#![allow( + clippy::cast_lossless, + clippy::cast_possible_truncation, + clippy::must_use_candidate, + clippy::unreadable_literal +)] + +mod udiv128; + +use core::mem::{self, MaybeUninit}; +use core::{ptr, slice, str}; +#[cfg(feature = "no-panic")] +use no_panic::no_panic; + +/// A correctly sized stack allocation for the formatted integer to be written +/// into. +/// +/// # Example +/// +/// ``` +/// let mut buffer = itoa::Buffer::new(); +/// let printed = buffer.format(1234); +/// assert_eq!(printed, "1234"); +/// ``` +pub struct Buffer { + bytes: [MaybeUninit<u8>; I128_MAX_LEN], +} + +impl Default for Buffer { + #[inline] + fn default() -> Buffer { + Buffer::new() + } +} + +impl Clone for Buffer { + #[inline] + fn clone(&self) -> Self { + Buffer::new() + } +} + +impl Buffer { + /// This is a cheap operation; you don't need to worry about reusing buffers + /// for efficiency. + #[inline] + #[cfg_attr(feature = "no-panic", no_panic)] + pub fn new() -> Buffer { + let bytes = [MaybeUninit::<u8>::uninit(); I128_MAX_LEN]; + Buffer { bytes } + } + + /// Print an integer into this buffer and return a reference to its string + /// representation within the buffer. + #[cfg_attr(feature = "no-panic", no_panic)] + pub fn format<I: Integer>(&mut self, i: I) -> &str { + i.write(unsafe { + &mut *(&mut self.bytes as *mut [MaybeUninit<u8>; I128_MAX_LEN] + as *mut <I as private::Sealed>::Buffer) + }) + } +} + +/// An integer that can be written into an [`itoa::Buffer`][Buffer]. +/// +/// This trait is sealed and cannot be implemented for types outside of itoa. +pub trait Integer: private::Sealed {} + +// Seal to prevent downstream implementations of the Integer trait. +mod private { + pub trait Sealed: Copy { + type Buffer: 'static; + fn write(self, buf: &mut Self::Buffer) -> &str; + } +} + +const DEC_DIGITS_LUT: &[u8] = b"\ + 0001020304050607080910111213141516171819\ + 2021222324252627282930313233343536373839\ + 4041424344454647484950515253545556575859\ + 6061626364656667686970717273747576777879\ + 8081828384858687888990919293949596979899"; + +// Adaptation of the original implementation at +// https://github.com/rust-lang/rust/blob/b8214dc6c6fc20d0a660fb5700dca9ebf51ebe89/src/libcore/fmt/num.rs#L188-L266 +macro_rules! impl_Integer { + ($($max_len:expr => $t:ident),* as $conv_fn:ident) => {$( + impl Integer for $t {} + + impl private::Sealed for $t { + type Buffer = [MaybeUninit<u8>; $max_len]; + + #[allow(unused_comparisons)] + #[inline] + #[cfg_attr(feature = "no-panic", no_panic)] + fn write(self, buf: &mut [MaybeUninit<u8>; $max_len]) -> &str { + let is_nonnegative = self >= 0; + let mut n = if is_nonnegative { + self as $conv_fn + } else { + // convert the negative num to positive by summing 1 to it's 2 complement + (!(self as $conv_fn)).wrapping_add(1) + }; + let mut curr = buf.len() as isize; + let buf_ptr = buf.as_mut_ptr() as *mut u8; + let lut_ptr = DEC_DIGITS_LUT.as_ptr(); + + unsafe { + // need at least 16 bits for the 4-characters-at-a-time to work. + if mem::size_of::<$t>() >= 2 { + // eagerly decode 4 characters at a time + while n >= 10000 { + let rem = (n % 10000) as isize; + n /= 10000; + + let d1 = (rem / 100) << 1; + let d2 = (rem % 100) << 1; + curr -= 4; + ptr::copy_nonoverlapping(lut_ptr.offset(d1), buf_ptr.offset(curr), 2); + ptr::copy_nonoverlapping(lut_ptr.offset(d2), buf_ptr.offset(curr + 2), 2); + } + } + + // if we reach here numbers are <= 9999, so at most 4 chars long + let mut n = n as isize; // possibly reduce 64bit math + + // decode 2 more chars, if > 2 chars + if n >= 100 { + let d1 = (n % 100) << 1; + n /= 100; + curr -= 2; + ptr::copy_nonoverlapping(lut_ptr.offset(d1), buf_ptr.offset(curr), 2); + } + + // decode last 1 or 2 chars + if n < 10 { + curr -= 1; + *buf_ptr.offset(curr) = (n as u8) + b'0'; + } else { + let d1 = n << 1; + curr -= 2; + ptr::copy_nonoverlapping(lut_ptr.offset(d1), buf_ptr.offset(curr), 2); + } + + if !is_nonnegative { + curr -= 1; + *buf_ptr.offset(curr) = b'-'; + } + } + + let len = buf.len() - curr as usize; + let bytes = unsafe { slice::from_raw_parts(buf_ptr.offset(curr), len) }; + unsafe { str::from_utf8_unchecked(bytes) } + } + } + )*}; +} + +const I8_MAX_LEN: usize = 4; +const U8_MAX_LEN: usize = 3; +const I16_MAX_LEN: usize = 6; +const U16_MAX_LEN: usize = 5; +const I32_MAX_LEN: usize = 11; +const U32_MAX_LEN: usize = 10; +const I64_MAX_LEN: usize = 20; +const U64_MAX_LEN: usize = 20; + +impl_Integer!( + I8_MAX_LEN => i8, + U8_MAX_LEN => u8, + I16_MAX_LEN => i16, + U16_MAX_LEN => u16, + I32_MAX_LEN => i32, + U32_MAX_LEN => u32 + as u32); + +impl_Integer!(I64_MAX_LEN => i64, U64_MAX_LEN => u64 as u64); + +#[cfg(target_pointer_width = "16")] +impl_Integer!(I16_MAX_LEN => isize, U16_MAX_LEN => usize as u16); + +#[cfg(target_pointer_width = "32")] +impl_Integer!(I32_MAX_LEN => isize, U32_MAX_LEN => usize as u32); + +#[cfg(target_pointer_width = "64")] +impl_Integer!(I64_MAX_LEN => isize, U64_MAX_LEN => usize as u64); + +macro_rules! impl_Integer128 { + ($($max_len:expr => $t:ident),*) => {$( + impl Integer for $t {} + + impl private::Sealed for $t { + type Buffer = [MaybeUninit<u8>; $max_len]; + + #[allow(unused_comparisons)] + #[inline] + #[cfg_attr(feature = "no-panic", no_panic)] + fn write(self, buf: &mut [MaybeUninit<u8>; $max_len]) -> &str { + let is_nonnegative = self >= 0; + let n = if is_nonnegative { + self as u128 + } else { + // convert the negative num to positive by summing 1 to it's 2 complement + (!(self as u128)).wrapping_add(1) + }; + let mut curr = buf.len() as isize; + let buf_ptr = buf.as_mut_ptr() as *mut u8; + + unsafe { + // Divide by 10^19 which is the highest power less than 2^64. + let (n, rem) = udiv128::udivmod_1e19(n); + let buf1 = buf_ptr.offset(curr - U64_MAX_LEN as isize) as *mut [MaybeUninit<u8>; U64_MAX_LEN]; + curr -= rem.write(&mut *buf1).len() as isize; + + if n != 0 { + // Memset the base10 leading zeros of rem. + let target = buf.len() as isize - 19; + ptr::write_bytes(buf_ptr.offset(target), b'0', (curr - target) as usize); + curr = target; + + // Divide by 10^19 again. + let (n, rem) = udiv128::udivmod_1e19(n); + let buf2 = buf_ptr.offset(curr - U64_MAX_LEN as isize) as *mut [MaybeUninit<u8>; U64_MAX_LEN]; + curr -= rem.write(&mut *buf2).len() as isize; + + if n != 0 { + // Memset the leading zeros. + let target = buf.len() as isize - 38; + ptr::write_bytes(buf_ptr.offset(target), b'0', (curr - target) as usize); + curr = target; + + // There is at most one digit left + // because u128::max / 10^19 / 10^19 is 3. + curr -= 1; + *buf_ptr.offset(curr) = (n as u8) + b'0'; + } + } + + if !is_nonnegative { + curr -= 1; + *buf_ptr.offset(curr) = b'-'; + } + + let len = buf.len() - curr as usize; + let bytes = slice::from_raw_parts(buf_ptr.offset(curr), len); + str::from_utf8_unchecked(bytes) + } + } + } + )*}; +} + +const U128_MAX_LEN: usize = 39; +const I128_MAX_LEN: usize = 40; + +impl_Integer128!(I128_MAX_LEN => i128, U128_MAX_LEN => u128); diff --git a/third_party/rust/itoa/src/udiv128.rs b/third_party/rust/itoa/src/udiv128.rs new file mode 100644 index 0000000000..0587047a77 --- /dev/null +++ b/third_party/rust/itoa/src/udiv128.rs @@ -0,0 +1,48 @@ +#[cfg(feature = "no-panic")] +use no_panic::no_panic; + +/// Multiply unsigned 128 bit integers, return upper 128 bits of the result +#[inline] +#[cfg_attr(feature = "no-panic", no_panic)] +fn u128_mulhi(x: u128, y: u128) -> u128 { + let x_lo = x as u64; + let x_hi = (x >> 64) as u64; + let y_lo = y as u64; + let y_hi = (y >> 64) as u64; + + // handle possibility of overflow + let carry = (x_lo as u128 * y_lo as u128) >> 64; + let m = x_lo as u128 * y_hi as u128 + carry; + let high1 = m >> 64; + + let m_lo = m as u64; + let high2 = (x_hi as u128 * y_lo as u128 + m_lo as u128) >> 64; + + x_hi as u128 * y_hi as u128 + high1 + high2 +} + +/// Divide `n` by 1e19 and return quotient and remainder +/// +/// Integer division algorithm is based on the following paper: +/// +/// T. Granlund and P. Montgomery, “Division by Invariant Integers Using Multiplication” +/// in Proc. of the SIGPLAN94 Conference on Programming Language Design and +/// Implementation, 1994, pp. 61–72 +/// +#[inline] +#[cfg_attr(feature = "no-panic", no_panic)] +pub fn udivmod_1e19(n: u128) -> (u128, u64) { + let d = 10_000_000_000_000_000_000_u64; // 10^19 + + let quot = if n < 1 << 83 { + ((n >> 19) as u64 / (d >> 19)) as u128 + } else { + u128_mulhi(n, 156927543384667019095894735580191660403) >> 62 + }; + + let rem = (n - quot * d as u128) as u64; + debug_assert_eq!(quot, n / d as u128); + debug_assert_eq!(rem as u128, n % d as u128); + + (quot, rem) +} diff --git a/third_party/rust/itoa/tests/test.rs b/third_party/rust/itoa/tests/test.rs new file mode 100644 index 0000000000..1d7e8cb600 --- /dev/null +++ b/third_party/rust/itoa/tests/test.rs @@ -0,0 +1,29 @@ +#![allow(non_snake_case)] +#![allow(clippy::cast_lossless)] + +macro_rules! test { + ($($name:ident($value:expr, $expected:expr))*) => { + $( + #[test] + fn $name() { + let mut buffer = itoa::Buffer::new(); + let s = buffer.format($value); + assert_eq!(s, $expected); + } + )* + } +} + +test! { + test_u64_0(0u64, "0") + test_u64_half(u32::max_value() as u64, "4294967295") + test_u64_max(u64::max_value(), "18446744073709551615") + test_i64_min(i64::min_value(), "-9223372036854775808") + + test_i16_0(0i16, "0") + test_i16_min(i16::min_value(), "-32768") + + test_u128_0(0u128, "0") + test_u128_max(u128::max_value(), "340282366920938463463374607431768211455") + test_i128_min(i128::min_value(), "-170141183460469231731687303715884105728") +} |