rust/library/compiler-builtins/libm/src/math, branch master

Mark float intrinsics with no preconditions as safe

2025-09-22T00:37:51+00:00

Fix some typos

2025-08-19T23:03:18+00:00

Simplify the configuration for no-panic

2025-07-30T15:02:34+00:00

Currently, attributes for `no-panic` are gated behind both the `test` config and `assert_no_panic`, because `no-panic` is a dev dependency (so only available with test configuration). However, we only emit `assert_no_panic` when the test config is also set anyway, so there isn't any need to gate on both. Replace gates on `all(test, assert_no_panic)` with only `assert_no_panic`. This is simpler, and also has the benefit that attempting to check for panics without `--test` errors.

Implement `floor` and `ceil` in assembly on `i586`

2025-07-27T21:27:40+00:00

Fixes: https://github.com/rust-lang/compiler-builtins/issues/837 The assembly is based on - https://github.com/NetBSD/src/blob/20433927938987dd64c8f6aa46904b7aca3fa39e/lib/libm/arch/i387/s_floor.S - https://github.com/NetBSD/src/blob/20433927938987dd64c8f6aa46904b7aca3fa39e/lib/libm/arch/i387/s_ceil.S Which both state /* * Written by J.T. Conklin . * Public domain. */ Which I believe means we're good in terms of licensing.

Avoid inlining `floor` into `rem_pio2`

2025-07-27T05:26:58+00:00

Possible workaround for https://github.com/rust-lang/compiler-builtins/pull/976#issuecomment-3085530354 Inline assembly in the body of a function currently causes the compiler to consider that function possibly unwinding, even if said asm originated from inlining an `extern "C"` function. This patch wraps the problematic callsite with `#[inline(never)]`.

libm: Update for new warn-by-default clippy lints

2025-07-27T01:21:35+00:00

Silence the approximate constant lint because it is noisy and not always correct. `single_component_path_imports` is also not accurate when built as part of `compiler-builtins`, so that needs to be `allow`ed as well.

Use `x86_no_sse` configuration in more places

2025-07-24T19:37:45+00:00

Emit `x86_no_sse` in the compiler-builtins (and builtins-test) build script, and use it to simplify `all(target_arch = "x86", not(target_fefature = "sse))` configuration.

Enable tests that were skipped on PowerPC

2025-07-24T12:18:08+00:00

Most of these were skipped because of a bug with the platform implementation, or some kind of crash unwinding. Since the upgrade to Ubuntu 25.04, these all seem to be resolved with the exception of a bug in the host `__floatundisf` [1]. [1] https://github.com/rust-lang/compiler-builtins/pull/384#issuecomment-740413334

Allow a new lint failure in nightly

2025-07-17T08:59:25+00:00

```text warning: function `f32_to_bits` is never used --> libm/src/math/support/float_traits.rs:367:14 | 367 | pub const fn f32_to_bits(x: f32) -> u32 { | ^^^^^^^^^^^ | = note: `#[warn(dead_code)]` on by default warning: function `f64_to_bits` is never used --> libm/src/math/support/float_traits.rs:381:14 | 381 | pub const fn f64_to_bits(x: f64) -> u64 { | ^^^^^^^^^^^ warning: `libm` (lib) generated 2 warnings ``` This is a false positive, see RUST-144060.

libm: Improved integer utilities, implement shifts and bug fixes for i256 and u256

2025-07-01T08:07:48+00:00

`i256` and `u256` - operators now use the same overflow convention as primitives - implement `<<` and `-` (previously just `>>` and `+`) - implement `Ord` correctly (the previous `PartialOrd` was broken) - correct `i256::SIGNED` to `true` The `Int`-trait is extended with `trailing_zeros`, `carrying_add`, and `borrowing_sub`.