Fix clippy warnings and simd_neg usage

Author: GrigoryEvko

crates/core_simd/examples/spectral_norm.rs

@@ -8,7 +8,7 @@ fn a(i: usize, j: usize) -> f64 {
 
 fn mult_av(v: &[f64], out: &mut [f64]) {
     assert!(v.len() == out.len());
-    assert!(v.len() % 2 == 0);
+    assert!(v.len().is_multiple_of(2));
 
     for (i, out) in out.iter_mut().enumerate() {
         let mut sum = f64x2::splat(0.0);
@@ -26,7 +26,7 @@ fn mult_av(v: &[f64], out: &mut [f64]) {
 
 fn mult_atv(v: &[f64], out: &mut [f64]) {
     assert!(v.len() == out.len());
-    assert!(v.len() % 2 == 0);
+    assert!(v.len().is_multiple_of(2));
 
     for (i, out) in out.iter_mut().enumerate() {
         let mut sum = f64x2::splat(0.0);
@@ -48,7 +48,7 @@ fn mult_atav(v: &[f64], out: &mut [f64], tmp: &mut [f64]) {
 }
 
 pub fn spectral_norm(n: usize) -> f64 {
-    assert!(n % 2 == 0, "only even lengths are accepted");
+    assert!(n.is_multiple_of(2), "only even lengths are accepted");
 
     let mut u = vec![1.0; n];
     let mut v = u.clone();

crates/std_float/src/lib.rs

@@ -66,7 +66,7 @@ pub trait StdFloat: Sealed + Sized {
     #[inline]
     #[must_use = "method returns a new vector and does not mutate the original value"]
     fn mul_sub(self, a: Self, b: Self) -> Self {
-        unsafe { intrinsics::simd_fma(self, a, intrinsics::simd_fneg(b)) }
+        unsafe { intrinsics::simd_fma(self, a, intrinsics::simd_neg(b)) }
     }
 
     /// Produces a vector where every element has the square root value

crates/std_float/tests/fma.rs

@@ -1,7 +1,7 @@
 #![feature(portable_simd)]
 
 use core_simd::simd::prelude::*;
-use crate::StdFloat;
+use std_float::StdFloat;
 
 #[test]
 fn test_mul_add_basic() {