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Clarify udiv128 licensing

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David Tolnay 2019-05-01 18:23:30 -07:00
parent 35ea54ed6b
commit 17d828c5a6
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1 changed files with 17 additions and 19 deletions
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src/udiv128.rs
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@ -1,25 +1,23 @@
// The code in this file is based on Rust's compiler-builtins crate. The Rust
// compiler automatically links programs against this crate for target-specific
// runtime support. We have copied the implementation of `__udivmodti4()` which
// is an intrinsic implementing division with remainder for architectures
// without 128-bit integers. This implementation works around some poor codegen
// by LLVM (https://github.com/rust-lang/rust/issues/44545) and allows for
// inlining which does not happen with the intrinsic.
//
// The compiler-builtins crate carries the following license, which is available
// in full at:
// https://github.com/rust-lang-nursery/compiler-builtins/blob/master/LICENSE.TXT
//
// ---
//
// Copyright 2009-2016 compiler-builtins Developers
//
// The compiler-builtins crate is dual licensed under both the University of
// Illinois "BSD-Like" license and the MIT license. As a user of this code you may
// choose to use it under either license. As a contributor, you agree to allow
// your code to be used under both.
//
// Full text of the relevant licenses is found here:
// https://github.com/rust-lang-nursery/compiler-builtins/blob/master/LICENSE.TXT
//
//
//
// The following code is based on Rust’s [compiler-builtins crate]
// (https://github.com/rust-lang-nursery/compiler-builtins) which
// provides runtime functions for the Rust programs. The Rust
// compiler will automatically link your programs against this crate.
//
// We copied the implementation of '__udivmodti4()' which is an intrinsic
// implementing division with remainder for architectures without 128-bit integer support.
// We have done this two reasons, to work around [bad optimization by LLVM]
// (https://github.com/rust-lang/rust/issues/44545) and to allow function
// inlining which doesn’t happen with the intrinsic.
// Illinois "BSD-Like" license and the MIT license. As a user of this code you
// may choose to use it under either license. As a contributor, you agree to
// allow your code to be used under both.
#[inline]
pub fn udivmod_1e19(n: u128) -> (u128, u64) {