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blis-src

This repository contains a Rust package to build and link BLIS, the BLAS-like Library Instantiation Framework. It can be used as a BLAS implementation via (Fortran) BLAS and/or CBLAS interfaces from blas-sys and cblas-sys respectively. Users simply seeking a fast BLAS are encouraged to use blas-src with the following in Cargo.toml:

[dependencies]
blas-src = { version = "0.10", features = ["blis"] }

To access the full BLIS API, direct use of extern "C" is necessary at this time.

The following Cargo features are supported:

• cblas to build the CBLAS interface (enabled by default),
• static to link libblis.a statically,
• exactly one of pthreads, openmp, serial to specify the threading mode (pthreads by default), and
• system do not compile BLIS and instead use a system-provided version (must be in system's default link path).

The system feature is convenient after apt install libblis-dev or brew install blis, for example. When system is disabled, BLIS is built to use run-time dispatch to microkernels optimized for the target architecture; a single binary is thus portable and optimized for all x86-64 CPUs.

Cross compilation

Use the --target option to cargo build and set the environment variables TARGET_CC, TARGET_FC (to detect Fortran calling convention), TARGET_AR, TARGET_RANLIB, TARGET_CFLAGS, and TARGET_LDFLAGS. BLIS does not currently support runtime CPU detection on ARM and PowerPC targets, so you must set BLIS_CONFNAME to a suitable value for the target (e.g., cortexa57 or power9; see BLIS docs).

License

Apache 2.0/MIT

All original work licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT) at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.