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6cd17ff4d2
This adds comparisons among the compiler-builtins function, system functions if available, and optionally handwritten assembly. These also help us identify inconsistencies between this crate and system functions, which may otherwise go unnoticed if intrinsics get lowered to inline operations rather than library calls.
72 lines
2.8 KiB
Rust
72 lines
2.8 KiB
Rust
use std::{collections::HashSet, env};
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/// Features to enable
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#[derive(Debug, PartialEq, Eq, Hash)]
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enum Feature {
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NoSysF128,
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NoSysF128IntConvert,
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NoSysF16,
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NoSysF16F128Convert,
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}
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fn main() {
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let target = env::var("TARGET").unwrap();
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let mut features = HashSet::new();
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// These platforms do not have f128 symbols available in their system libraries, so
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// skip related tests.
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if target.starts_with("arm-")
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|| target.contains("apple-darwin")
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|| target.contains("windows-msvc")
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// GCC and LLVM disagree on the ABI of `f16` and `f128` with MinGW. See
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// <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115054>.
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|| target.contains("windows-gnu")
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// FIXME(llvm): There is an ABI incompatibility between GCC and Clang on 32-bit x86.
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// See <https://github.com/llvm/llvm-project/issues/77401>.
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|| target.starts_with("i686")
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// 32-bit PowerPC gets code generated that Qemu cannot handle. See
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// <https://github.com/rust-lang/compiler-builtins/pull/606#issuecomment-2105635926>.
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|| target.starts_with("powerpc-")
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// FIXME: We get different results from the builtin functions. See
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// <https://github.com/rust-lang/compiler-builtins/pull/606#issuecomment-2105657287>.
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|| target.starts_with("powerpc64-")
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{
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features.insert(Feature::NoSysF128);
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features.insert(Feature::NoSysF128IntConvert);
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features.insert(Feature::NoSysF16F128Convert);
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}
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if target.starts_with("i586") || target.starts_with("i686") {
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// 32-bit x86 seems to not have `__fixunstfti`, but does have everything else
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features.insert(Feature::NoSysF128IntConvert);
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}
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if target.contains("-unknown-linux-") {
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// No `__extendhftf2` on x86, no `__trunctfhf2` on aarch64
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features.insert(Feature::NoSysF16F128Convert);
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}
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if target.starts_with("wasm32-") {
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// Linking says "error: function signature mismatch: __extendhfsf2" and seems to
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// think the signature is either `(i32) -> f32` or `(f32) -> f32`
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features.insert(Feature::NoSysF16);
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}
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for feature in features {
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let (name, warning) = match feature {
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Feature::NoSysF128 => ("no-sys-f128", "using apfloat fallback for f128"),
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Feature::NoSysF128IntConvert => (
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"no-sys-f128-int-convert",
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"using apfloat fallback for f128 to int conversions",
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),
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Feature::NoSysF16F128Convert => (
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"no-sys-f16-f128-convert",
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"skipping using apfloat fallback for f16 <-> f128 conversions",
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),
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Feature::NoSysF16 => ("no-sys-f16", "using apfloat fallback for f16"),
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};
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println!("cargo:warning={warning}");
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println!("cargo:rustc-cfg=feature=\"{name}\"");
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}
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}
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