diff options
| -rw-r--r-- | clippy_lints/src/floating_point_arithmetic.rs | 30 | ||||
| -rw-r--r-- | tests/ui/floating_point_powf.fixed | 5 | ||||
| -rw-r--r-- | tests/ui/floating_point_powf.rs | 5 | ||||
| -rw-r--r-- | tests/ui/floating_point_powf.stderr | 50 |
4 files changed, 62 insertions, 28 deletions
diff --git a/clippy_lints/src/floating_point_arithmetic.rs b/clippy_lints/src/floating_point_arithmetic.rs index bb50e8fcabb..9120507f48c 100644 --- a/clippy_lints/src/floating_point_arithmetic.rs +++ b/clippy_lints/src/floating_point_arithmetic.rs @@ -238,23 +238,23 @@ fn get_integer_from_float_constant(value: &Constant) -> Option<i32> { fn check_powf(cx: &LateContext<'_>, expr: &Expr<'_>, args: &[Expr<'_>]) { // Check receiver if let Some((value, _)) = constant(cx, cx.typeck_results(), &args[0]) { - let method = if F32(f32_consts::E) == value || F64(f64_consts::E) == value { - "exp" + if let Some(method) = if F32(f32_consts::E) == value || F64(f64_consts::E) == value { + Some("exp") } else if F32(2.0) == value || F64(2.0) == value { - "exp2" + Some("exp2") } else { - return; - }; - - span_lint_and_sugg( - cx, - SUBOPTIMAL_FLOPS, - expr.span, - "exponent for bases 2 and e can be computed more accurately", - "consider using", - format!("{}.{}()", prepare_receiver_sugg(cx, &args[1]), method), - Applicability::MachineApplicable, - ); + None + } { + span_lint_and_sugg( + cx, + SUBOPTIMAL_FLOPS, + expr.span, + "exponent for bases 2 and e can be computed more accurately", + "consider using", + format!("{}.{}()", prepare_receiver_sugg(cx, &args[1]), method), + Applicability::MachineApplicable, + ); + } } // Check argument diff --git a/tests/ui/floating_point_powf.fixed b/tests/ui/floating_point_powf.fixed index 7efe10a10f9..e7ef45634df 100644 --- a/tests/ui/floating_point_powf.fixed +++ b/tests/ui/floating_point_powf.fixed @@ -18,6 +18,11 @@ fn main() { let _ = x.powi(-16_777_215); let _ = (x as f32).powi(-16_777_215); let _ = (x as f32).powi(3); + let _ = (1.5_f32 + 1.0).cbrt(); + let _ = 1.5_f64.cbrt(); + let _ = 1.5_f64.sqrt(); + let _ = 1.5_f64.powi(3); + // Cases where the lint shouldn't be applied let _ = x.powf(2.1); let _ = x.powf(-2.1); diff --git a/tests/ui/floating_point_powf.rs b/tests/ui/floating_point_powf.rs index 445080417f2..d749aa2d48a 100644 --- a/tests/ui/floating_point_powf.rs +++ b/tests/ui/floating_point_powf.rs @@ -18,6 +18,11 @@ fn main() { let _ = x.powf(-16_777_215.0); let _ = (x as f32).powf(-16_777_215.0); let _ = (x as f32).powf(3.0); + let _ = (1.5_f32 + 1.0).powf(1.0 / 3.0); + let _ = 1.5_f64.powf(1.0 / 3.0); + let _ = 1.5_f64.powf(1.0 / 2.0); + let _ = 1.5_f64.powf(3.0); + // Cases where the lint shouldn't be applied let _ = x.powf(2.1); let _ = x.powf(-2.1); diff --git a/tests/ui/floating_point_powf.stderr b/tests/ui/floating_point_powf.stderr index 6ee696e6ada..e9693de8fc9 100644 --- a/tests/ui/floating_point_powf.stderr +++ b/tests/ui/floating_point_powf.stderr @@ -92,77 +92,101 @@ error: exponentiation with integer powers can be computed more efficiently LL | let _ = (x as f32).powf(3.0); | ^^^^^^^^^^^^^^^^^^^^ help: consider using: `(x as f32).powi(3)` +error: cube-root of a number can be computed more accurately + --> $DIR/floating_point_powf.rs:21:13 + | +LL | let _ = (1.5_f32 + 1.0).powf(1.0 / 3.0); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `(1.5_f32 + 1.0).cbrt()` + +error: cube-root of a number can be computed more accurately + --> $DIR/floating_point_powf.rs:22:13 + | +LL | let _ = 1.5_f64.powf(1.0 / 3.0); + | ^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `1.5_f64.cbrt()` + +error: square-root of a number can be computed more efficiently and accurately + --> $DIR/floating_point_powf.rs:23:13 + | +LL | let _ = 1.5_f64.powf(1.0 / 2.0); + | ^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `1.5_f64.sqrt()` + +error: exponentiation with integer powers can be computed more efficiently + --> $DIR/floating_point_powf.rs:24:13 + | +LL | let _ = 1.5_f64.powf(3.0); + | ^^^^^^^^^^^^^^^^^ help: consider using: `1.5_f64.powi(3)` + error: exponent for bases 2 and e can be computed more accurately - --> $DIR/floating_point_powf.rs:28:13 + --> $DIR/floating_point_powf.rs:33:13 | LL | let _ = 2f64.powf(x); | ^^^^^^^^^^^^ help: consider using: `x.exp2()` error: exponent for bases 2 and e can be computed more accurately - --> $DIR/floating_point_powf.rs:29:13 + --> $DIR/floating_point_powf.rs:34:13 | LL | let _ = 2f64.powf(3.1); | ^^^^^^^^^^^^^^ help: consider using: `3.1f64.exp2()` error: exponent for bases 2 and e can be computed more accurately - --> $DIR/floating_point_powf.rs:30:13 + --> $DIR/floating_point_powf.rs:35:13 | LL | let _ = 2f64.powf(-3.1); | ^^^^^^^^^^^^^^^ help: consider using: `(-3.1f64).exp2()` error: exponent for bases 2 and e can be computed more accurately - --> $DIR/floating_point_powf.rs:31:13 + --> $DIR/floating_point_powf.rs:36:13 | LL | let _ = std::f64::consts::E.powf(x); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `x.exp()` error: exponent for bases 2 and e can be computed more accurately - --> $DIR/floating_point_powf.rs:32:13 + --> $DIR/floating_point_powf.rs:37:13 | LL | let _ = std::f64::consts::E.powf(3.1); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `3.1f64.exp()` error: exponent for bases 2 and e can be computed more accurately - --> $DIR/floating_point_powf.rs:33:13 + --> $DIR/floating_point_powf.rs:38:13 | LL | let _ = std::f64::consts::E.powf(-3.1); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `(-3.1f64).exp()` error: square-root of a number can be computed more efficiently and accurately - --> $DIR/floating_point_powf.rs:34:13 + --> $DIR/floating_point_powf.rs:39:13 | LL | let _ = x.powf(1.0 / 2.0); | ^^^^^^^^^^^^^^^^^ help: consider using: `x.sqrt()` error: cube-root of a number can be computed more accurately - --> $DIR/floating_point_powf.rs:35:13 + --> $DIR/floating_point_powf.rs:40:13 | LL | let _ = x.powf(1.0 / 3.0); | ^^^^^^^^^^^^^^^^^ help: consider using: `x.cbrt()` error: exponentiation with integer powers can be computed more efficiently - --> $DIR/floating_point_powf.rs:36:13 + --> $DIR/floating_point_powf.rs:41:13 | LL | let _ = x.powf(3.0); | ^^^^^^^^^^^ help: consider using: `x.powi(3)` error: exponentiation with integer powers can be computed more efficiently - --> $DIR/floating_point_powf.rs:37:13 + --> $DIR/floating_point_powf.rs:42:13 | LL | let _ = x.powf(-2.0); | ^^^^^^^^^^^^ help: consider using: `x.powi(-2)` error: exponentiation with integer powers can be computed more efficiently - --> $DIR/floating_point_powf.rs:38:13 + --> $DIR/floating_point_powf.rs:43:13 | LL | let _ = x.powf(-2_147_483_648.0); | ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `x.powi(-2_147_483_648)` error: exponentiation with integer powers can be computed more efficiently - --> $DIR/floating_point_powf.rs:39:13 + --> $DIR/floating_point_powf.rs:44:13 | LL | let _ = x.powf(2_147_483_647.0); | ^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `x.powi(2_147_483_647)` -error: aborting due to 27 previous errors +error: aborting due to 31 previous errors |