mirror of
https://github.com/BLAKE3-team/BLAKE3
synced 2024-05-03 22:27:42 +02:00
e06a0f255a
The biggest change here is that assembly implementations are enabled by default. Added features: - "pure" (Pure Rust, with no C or assembly implementations.) Removed features: - "c" (Now basically the default.) Renamed features; - "c_prefer_intrinsics" -> "prefer_intrinsics" - "c_neon" -> "neon" Unchanged: - "rayon" - "std" (Still the only feature on by default.)
165 lines
6.1 KiB
Rust
165 lines
6.1 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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Your version of the MSVC C compiler does not support the "/arch:AVX512" flag.
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If you're building the "b3sum" or "bao_bin" crates, you can disable AVX-512
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with "--features=pure". Other crates might or might not support this
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workaround.
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"#;
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const GNU_ERROR: &str = r#"
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Your C compiler does not support the "-mavx512f" flag. If you are building the
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"b3sum" or "bao_bin" crates, you can disable AVX-512 with "--features=pure".
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Other crates might or might not support 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_PURE") && defined("CARGO_FEATURE_NEON") {
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panic!("It doesn't make sense to enable both \"pure\" and \"neon\".");
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}
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if (is_x86_64() || is_x86_32()) && !defined("CARGO_FEATURE_PURE") {
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check_for_avx512_compiler_support();
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if is_x86_64() && !defined("CARGO_FEATURE_PREFER_INTRINSICS") {
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// On 64-bit, use the assembly implementations, unless the
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// "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 {
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// Assembly implementations are only for x86_64. On 32-bit x86, or
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// if the "prefer_intrinsics" feature is enabled, use the Rust
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// intrinsics implementations for SSE4.1 and AVX2, and the C
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// intrinsics implementation for AVX-512. (Stable Rust does not yet
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// support AVX-512.)
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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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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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if is_windows_gnu() {
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// Workaround for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65782.
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avx512_build.flag("-fno-asynchronous-unwind-tables");
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}
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avx512_build.compile("blake3_avx512");
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}
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}
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if defined("CARGO_FEATURE_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 ffi_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 doesn't 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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