mirror of
https://github.com/BLAKE3-team/BLAKE3
synced 2024-09-28 23:31:41 +02:00
189 lines
7.2 KiB
Rust
189 lines
7.2 KiB
Rust
use std::env;
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fn defined(var: &str) -> bool {
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env::var_os(var).is_some()
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}
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fn target_components() -> Vec<String> {
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let target = env::var("TARGET").unwrap();
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target.split("-").map(|s| s.to_string()).collect()
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}
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fn is_x86_64() -> bool {
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target_components()[0] == "x86_64"
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}
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fn is_x86_32() -> bool {
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let arch = &target_components()[0];
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arch == "i386" || arch == "i586" || arch == "i686"
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}
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fn is_armv7() -> bool {
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target_components()[0] == "armv7"
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}
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// Windows targets may be using the MSVC toolchain or the GNU toolchain. The
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// right compiler flags to use depend on the toolchain. (And we don't want to
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// use flag_if_supported, because we don't want features to be silently
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// disabled by old compilers.)
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fn is_windows_msvc() -> bool {
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// Some targets are only two components long, so check in steps.
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target_components()[1] == "pc"
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&& target_components()[2] == "windows"
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&& target_components()[3] == "msvc"
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}
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fn is_windows_gnu() -> bool {
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// Some targets are only two components long, so check in steps.
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target_components()[1] == "pc"
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&& target_components()[2] == "windows"
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&& target_components()[3] == "gnu"
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}
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fn new_build() -> cc::Build {
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let mut build = cc::Build::new();
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if !is_windows_msvc() {
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build.flag("-std=c11");
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}
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build
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}
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const WINDOWS_MSVC_ERROR: &str = r#"
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The "c" feature is enabled, but your version of the MSVC C compiler does not
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support the "/arch:AVX512" flag. If you are building the "b3sum" or "bao_bin"
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crates, you can disable AVX-512 with Cargo's "--no-default-features" flag.
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(Note that this also disables other default features like Rayon-based
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multithreading, which you can re-enable with "--features=rayon".) Other crates
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might or might not support this workaround.
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"#;
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const GNU_ERROR: &str = r#"
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The "c" feature is enabled, but your C compiler does not support the
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"-mavx512f" flag. If you are building the "b3sum" or "bao_bin" crates, you can
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disable AVX-512 with Cargo's "--no-default-features" flag. (Note that this also
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disables other default features like Rayon-based multithreading, which you can
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re-enable with "--features=rayon".) Other crates might or might not support
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this workaround.
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"#;
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fn check_for_avx512_compiler_support() {
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let build = new_build();
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if is_windows_msvc() {
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if !build.is_flag_supported("/arch:AVX512").unwrap() {
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eprintln!("{}", WINDOWS_MSVC_ERROR.trim());
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std::process::exit(1);
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}
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} else {
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if !build.is_flag_supported("-mavx512f").unwrap() {
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eprintln!("{}", GNU_ERROR.trim());
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std::process::exit(1);
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}
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}
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}
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fn main() -> Result<(), Box<dyn std::error::Error>> {
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if defined("CARGO_FEATURE_C") {
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check_for_avx512_compiler_support();
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if is_x86_64() && !defined("CARGO_FEATURE_C_PREFER_INTRINSICS") {
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// On 64-bit, use the assembly implementations, unless the
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// "c_prefer_intrinsics" feature is enabled.
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if is_windows_msvc() {
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let mut build = new_build();
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build.file("c/blake3_sse41_x86-64_windows_msvc.asm");
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build.file("c/blake3_avx2_x86-64_windows_msvc.asm");
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build.file("c/blake3_avx512_x86-64_windows_msvc.asm");
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build.compile("blake3_asm");
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} else if is_windows_gnu() {
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let mut build = new_build();
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build.file("c/blake3_sse41_x86-64_windows_gnu.S");
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build.file("c/blake3_avx2_x86-64_windows_gnu.S");
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build.file("c/blake3_avx512_x86-64_windows_gnu.S");
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build.compile("blake3_asm");
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} else {
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// All non-Windows implementations are assumed to support
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// Linux-style assembly. These files do contain a small
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// explicit workaround for macOS also.
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let mut build = new_build();
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build.file("c/blake3_sse41_x86-64_unix.S");
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build.file("c/blake3_avx2_x86-64_unix.S");
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build.file("c/blake3_avx512_x86-64_unix.S");
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build.compile("blake3_asm");
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}
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} else if is_x86_64() || is_x86_32() {
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// Assembly implementations are only for 64-bit. On 32-bit, or if
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// the "c_prefer_intrinsics" feature is enabled, use the
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// intrinsics-based C implementations. These each need to be
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// compiled separately, with the corresponding instruction set
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// extension explicitly enabled in the compiler.
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let mut sse41_build = new_build();
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sse41_build.file("c/blake3_sse41.c");
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if is_windows_msvc() {
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// /arch:SSE2 is the default on x86 and undefined on x86_64:
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// https://docs.microsoft.com/en-us/cpp/build/reference/arch-x86
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// It also includes SSE4.1 intrisincs:
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// https://stackoverflow.com/a/32183222/823869
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} else {
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sse41_build.flag("-msse4.1");
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}
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sse41_build.compile("blake3_sse41");
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let mut avx2_build = new_build();
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avx2_build.file("c/blake3_avx2.c");
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if is_windows_msvc() {
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avx2_build.flag("/arch:AVX2");
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} else {
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avx2_build.flag("-mavx2");
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}
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avx2_build.compile("blake3_avx2");
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let mut avx512_build = new_build();
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avx512_build.file("c/blake3_avx512.c");
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if is_windows_msvc() {
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// Note that a lot of versions of MSVC don't support /arch:AVX512,
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// and they'll discard it with a warning, hopefully leading to a
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// build error.
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avx512_build.flag("/arch:AVX512");
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} else {
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avx512_build.flag("-mavx512f");
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avx512_build.flag("-mavx512vl");
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}
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avx512_build.compile("blake3_avx512");
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} else {
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// Currently no effect for non-x86 platforms.
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}
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}
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if defined("CARGO_FEATURE_C_NEON") {
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let mut build = new_build();
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// Note that blake3_neon.c normally depends on the blake3_portable.c
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// for the single-instance compression function, but we expose
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// portable.rs over FFI instead. See c_neon.rs.
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build.file("c/blake3_neon.c");
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// ARMv7 platforms that support NEON generally need the following
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// flags. AArch64 supports NEON by default and does not support -mpfu.
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if is_armv7() {
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build.flag("-mfpu=neon-vfpv4");
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build.flag("-mfloat-abi=hard");
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}
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build.compile("blake3_neon");
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}
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// The `cc` crate does not automatically emit rerun-if directives for the
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// environment variables it supports, in particular for $CC. We expect to
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// do a lot of benchmarking across different compilers, so we explicitly
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// add the variables that we're likely to need.
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println!("cargo:rerun-if-env-changed=CC");
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println!("cargo:rerun-if-env-changed=CFLAGS");
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// Ditto for source files, though these shouldn't change as often.
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for file in std::fs::read_dir("c")? {
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println!(
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"cargo:rerun-if-changed={}",
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file?.path().to_str().expect("utf-8")
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);
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}
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Ok(())
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}
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