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Support no_std compile-time SIMD #214

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Merged
seanmonstar merged 1 commit into from
Nov 10, 2025
+21 −12
Merged

Support no_std compile-time SIMD #214

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2 changes: 1 addition & 1 deletion src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,7 @@
//! parsing internals use an `Iterator` instead of direct indexing, while
//! skipping bounds checks.
//!
//! With Rust 1.27.0 or later, support for SIMD is enabled automatically.
//! SIMD optimizations are enabled automatically when available.
//! If building an executable to be run on multiple platforms, and thus
//! not passing `target_feature` or `target_cpu` flags to the compiler,
//! runtime detection can still detect SSE4.2 or AVX2 support to provide
Expand Down
31 changes: 20 additions & 11 deletions src/simd/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -3,21 +3,34 @@ mod swar;
#[cfg(any(
httparse_disable_simd,
miri,
not(feature = "std"),
not(any(
target_arch = "x86",
target_arch = "x86_64",
all(
target_arch = "aarch64",
target_feature = "neon",
)
))
)),
all(
not(feature = "std"),
not(any(
target_feature = "sse4.2",
target_feature = "avx2",
)),
any(
target_arch = "x86",
target_arch = "x86_64",
),
)
))]
pub use self::swar::*;

#[cfg(all(
not(any(httparse_disable_simd, miri)),
feature = "std",
any(
feature = "std",
target_feature = "sse4.2",
),
not(target_feature = "avx2"),
any(
target_arch = "x86",
Expand All @@ -28,10 +41,12 @@ mod sse42;

#[cfg(all(
not(any(httparse_disable_simd, miri)),
feature = "std",
any(
target_feature = "avx2",
not(target_feature = "sse4.2"),
all(
feature = "std",
not(target_feature = "sse4.2"),
),
),
any(
target_arch = "x86",
Expand Down Expand Up @@ -70,7 +85,6 @@ pub use self::runtime::*;

#[cfg(all(
not(any(httparse_disable_simd, miri)),
feature = "std",
target_feature = "sse4.2",
not(target_feature = "avx2"),
any(
Expand All @@ -97,7 +111,6 @@ mod sse42_compile_time {

#[cfg(all(
not(any(httparse_disable_simd, miri)),
feature = "std",
target_feature = "sse4.2",
not(target_feature = "avx2"),
any(
Expand All @@ -109,7 +122,6 @@ pub use self::sse42_compile_time::*;

#[cfg(all(
not(any(httparse_disable_simd, miri)),
feature = "std",
target_feature = "avx2",
any(
target_arch = "x86",
Expand All @@ -135,7 +147,6 @@ mod avx2_compile_time {

#[cfg(all(
not(any(httparse_disable_simd, miri)),
feature = "std",
target_feature = "avx2",
any(
target_arch = "x86",
Expand All @@ -146,15 +157,13 @@ pub use self::avx2_compile_time::*;

#[cfg(all(
not(any(httparse_disable_simd, miri)),
feature = "std",
target_arch = "aarch64",
target_feature = "neon",
))]
mod neon;

#[cfg(all(
not(any(httparse_disable_simd, miri)),
feature = "std",
target_arch = "aarch64",
target_feature = "neon",
))]
Expand Down