mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-12-24 20:13:24 +00:00
ff0d44e45a
Add lint to detect floating point operations that can be computed more accurately at the cost of performance. `cbrt`, `ln_1p` and `exp_m1` library functions call their equivalent cmath implementations which is slower but more accurate so moving checks for these under this new lint.
58 lines
1.6 KiB
Rust
58 lines
1.6 KiB
Rust
// run-rustfix
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#![allow(dead_code, clippy::double_parens)]
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#![warn(clippy::suboptimal_flops, clippy::imprecise_flops)]
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const TWO: f32 = 2.0;
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const E: f32 = std::f32::consts::E;
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fn check_log_base() {
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let x = 1f32;
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let _ = x.log(2f32);
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let _ = x.log(10f32);
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let _ = x.log(std::f32::consts::E);
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let _ = x.log(TWO);
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let _ = x.log(E);
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let x = 1f64;
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let _ = x.log(2f64);
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let _ = x.log(10f64);
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let _ = x.log(std::f64::consts::E);
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}
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fn check_ln1p() {
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let x = 1f32;
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let _ = (1f32 + 2.).ln();
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let _ = (1f32 + 2.0).ln();
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let _ = (1.0 + x).ln();
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let _ = (1.0 + x / 2.0).ln();
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let _ = (1.0 + x.powi(2)).ln();
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let _ = (1.0 + x.powi(2) / 2.0).ln();
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let _ = (1.0 + (std::f32::consts::E - 1.0)).ln();
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let _ = (x + 1.0).ln();
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let _ = (x.powi(2) + 1.0).ln();
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let _ = (x + 2.0 + 1.0).ln();
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let _ = (x / 2.0 + 1.0).ln();
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// Cases where the lint shouldn't be applied
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let _ = (1.0 + x + 2.0).ln();
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let _ = (x + 1.0 + 2.0).ln();
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let _ = (x + 1.0 / 2.0).ln();
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let _ = (1.0 + x - 2.0).ln();
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let x = 1f64;
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let _ = (1f64 + 2.).ln();
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let _ = (1f64 + 2.0).ln();
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let _ = (1.0 + x).ln();
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let _ = (1.0 + x / 2.0).ln();
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let _ = (1.0 + x.powi(2)).ln();
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let _ = (x + 1.0).ln();
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let _ = (x.powi(2) + 1.0).ln();
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let _ = (x + 2.0 + 1.0).ln();
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let _ = (x / 2.0 + 1.0).ln();
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// Cases where the lint shouldn't be applied
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let _ = (1.0 + x + 2.0).ln();
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let _ = (x + 1.0 + 2.0).ln();
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let _ = (x + 1.0 / 2.0).ln();
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let _ = (1.0 + x - 2.0).ln();
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}
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fn main() {}
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