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cc2874c9a9
Use the generic `scalbn` to provide `f16` and `f128` versions, which also work for `ldexp`. This involves a new algorithm for `f16` because the default does not converge fast enough with a limited number of rounds.
112 lines
3.1 KiB
Rust
112 lines
3.1 KiB
Rust
//! Compare our implementations with the result of musl functions, as provided by `musl-math-sys`.
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//!
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//! Currently this only tests randomized inputs. In the future this may be improved to test edge
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//! cases or run exhaustive tests.
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//!
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//! Note that musl functions do not always provide 0.5ULP rounding, so our functions can do better
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//! than these results.
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// There are some targets we can't build musl for
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#![cfg(feature = "build-musl")]
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use libm_test::gen::{edge_cases, random, spaced};
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use libm_test::{CheckBasis, CheckCtx, CheckOutput, GeneratorKind, MathOp, TupleCall};
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const BASIS: CheckBasis = CheckBasis::Musl;
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fn musl_runner<Op: MathOp>(
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ctx: &CheckCtx,
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cases: impl Iterator<Item = Op::RustArgs>,
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musl_fn: Op::CFn,
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) {
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for input in cases {
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let musl_res = input.call(musl_fn);
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let crate_res = input.call(Op::ROUTINE);
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crate_res.validate(musl_res, input, ctx).unwrap();
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}
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}
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/// Test against musl with generators from a domain.
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macro_rules! musl_tests {
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(
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fn_name: $fn_name:ident,
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attrs: [$($attr:meta),*],
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) => {
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paste::paste! {
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#[test]
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$(#[$attr])*
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fn [< musl_random_ $fn_name >]() {
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type Op = libm_test::op::$fn_name::Routine;
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let ctx = CheckCtx::new(Op::IDENTIFIER, BASIS, GeneratorKind::Random);
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let cases = random::get_test_cases::<<Op as MathOp>::RustArgs>(&ctx);
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musl_runner::<Op>(&ctx, cases, musl_math_sys::$fn_name);
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}
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#[test]
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$(#[$attr])*
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fn [< musl_edge_case_ $fn_name >]() {
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type Op = libm_test::op::$fn_name::Routine;
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let ctx = CheckCtx::new(Op::IDENTIFIER, BASIS, GeneratorKind::EdgeCases);
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let cases = edge_cases::get_test_cases::<Op>(&ctx);
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musl_runner::<Op>(&ctx, cases, musl_math_sys::$fn_name);
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}
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#[test]
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$(#[$attr])*
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fn [< musl_quickspace_ $fn_name >]() {
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type Op = libm_test::op::$fn_name::Routine;
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let ctx = CheckCtx::new(Op::IDENTIFIER, BASIS, GeneratorKind::QuickSpaced);
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let cases = spaced::get_test_cases::<Op>(&ctx).0;
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musl_runner::<Op>(&ctx, cases, musl_math_sys::$fn_name);
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}
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}
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};
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}
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libm_macros::for_each_function! {
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callback: musl_tests,
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attributes: [],
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skip: [
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// TODO integer inputs
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jn,
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jnf,
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ldexp,
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ldexpf,
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scalbn,
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scalbnf,
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yn,
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ynf,
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// Not provided by musl
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ceilf128,
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ceilf16,
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copysignf128,
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copysignf16,
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fabsf128,
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fabsf16,
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fdimf128,
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fdimf16,
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floorf128,
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floorf16,
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fmaxf128,
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fmaxf16,
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fminf128,
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fminf16,
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fmodf128,
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fmodf16,
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ldexpf128,
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ldexpf16,
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rintf128,
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rintf16,
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roundf128,
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roundf16,
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scalbnf128,
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scalbnf16,
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sqrtf128,
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sqrtf16,
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truncf128,
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truncf16,
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],
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}
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