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Support SIMD on the Emscripten target #50

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Support SIMD on the Emscripten target #50

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9 changes: 9 additions & 0 deletions build.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -103,6 +103,7 @@ fn setup_build(build: &mut cc::Build, include_dir: &PathBuf) {
}

let target_arch = env::var("CARGO_CFG_TARGET_ARCH").expect("CARGO_CFG_TARGET_ARCH");
let target_os = env::var("CARGO_CFG_TARGET_OS").unwrap_or_default();
let target_features = env::var("CARGO_CFG_TARGET_FEATURE").unwrap_or_default();
let has_feature = |f: &str| target_features.split(',').any(|feature| feature == f);

Expand Down Expand Up @@ -152,6 +153,14 @@ fn setup_build(build: &mut cc::Build, include_dir: &PathBuf) {
build.debug(false);
}
}
// Emscripten lowers the SSE intrinsics to wasm simd128; cpu.h derives
// WEBP_HAVE_SSE2/SSE41 from the compiler's __SSE2__/__SSE4_1__.
"wasm32" if target_os == "emscripten" && has_feature("simd128") => {
build.flag("-msimd128").flag("-msse2");
if cfg!(feature = "sse41") {
build.flag("-msse4.1");
}
}
_ => {}
};
}