diff --git a/library/compiler-builtins/libm/build.rs b/library/compiler-builtins/libm/build.rs
index 41dc920e9f7d..23e1178e3607 100644
--- a/library/compiler-builtins/libm/build.rs
+++ b/library/compiler-builtins/libm/build.rs
@@ -267,22 +267,17 @@ mod musl_reference_tests {
             .status()
             .unwrap();
         assert!(status.success());
-        let output = Command::new("./gen")
-            .current_dir(&dst)
-            .output()
-            .unwrap();
+        let output = Command::new("./gen").current_dir(&dst).output().unwrap();
         assert!(output.status.success());
         assert!(output.stderr.is_empty());
 
         // Map all the output bytes back to an `i64` and then shove it all into
         // the expected results.
-        let mut results =
-            output.stdout.chunks_exact(8)
-             .map(|buf| {
-                 let mut exact = [0; 8];
-                 exact.copy_from_slice(buf);
-                 i64::from_le_bytes(exact)
-             });
+        let mut results = output.stdout.chunks_exact(8).map(|buf| {
+            let mut exact = [0; 8];
+            exact.copy_from_slice(buf);
+            i64::from_le_bytes(exact)
+        });
 
         for test in functions.iter_mut().flat_map(|f| f.tests.iter_mut()) {
             test.output = results.next().unwrap();
@@ -301,7 +296,10 @@ mod musl_reference_tests {
             src.push_str("fn ");
             src.push_str(&function.name);
             src.push_str("_matches_musl() {");
-            src.push_str(&format!("static TESTS: &[([i64; {}], i64)]", function.args.len()));
+            src.push_str(&format!(
+                "static TESTS: &[([i64; {}], i64)]",
+                function.args.len()
+            ));
             src.push_str(" = &[");
             for test in function.tests.iter() {
                 src.push_str("([");
@@ -336,9 +334,11 @@ mod musl_reference_tests {
                 Ty::Bool => unreachable!(),
             });
 
-            src.push_str(r#"
+            src.push_str(
+                r#"
                 panic!("INPUT: {:?} EXPECTED: {:?} ACTUAL {:?}", test, expected, output);
-            "#);
+            "#,
+            );
             src.push_str("}");
 
             src.push_str("}");
diff --git a/library/compiler-builtins/libm/src/math/atan.rs b/library/compiler-builtins/libm/src/math/atan.rs
index a9cdc29333d0..ad1d57c1fe79 100644
--- a/library/compiler-builtins/libm/src/math/atan.rs
+++ b/library/compiler-builtins/libm/src/math/atan.rs
@@ -148,7 +148,8 @@ mod tests {
             (-3.0_f64.sqrt() / 3.0, -f64::consts::FRAC_PI_6),
             (-1.0, -f64::consts::FRAC_PI_4),
             (-3.0_f64.sqrt(), -f64::consts::FRAC_PI_3),
-        ].iter()
+        ]
+        .iter()
         {
             assert!(
                 (atan(*input) - answer) / answer < 1e-5,
diff --git a/library/compiler-builtins/libm/src/math/expf.rs b/library/compiler-builtins/libm/src/math/expf.rs
index e33425665eb9..baade2552e12 100644
--- a/library/compiler-builtins/libm/src/math/expf.rs
+++ b/library/compiler-builtins/libm/src/math/expf.rs
@@ -31,7 +31,6 @@ const P2: f32 = -2.7667332906e-3; /* -0xb55215.0p-32 */
 pub fn expf(mut x: f32) -> f32 {
     let x1p127 = f32::from_bits(0x7f000000); // 0x1p127f === 2 ^ 127
     let x1p_126 = f32::from_bits(0x800000); // 0x1p-126f === 2 ^ -126  /*original 0x1p-149f    ??????????? */
-
     let mut hx = x.to_bits();
     let sign = (hx >> 31) as i32; /* sign bit of x */
     let signb: bool = sign != 0;
diff --git a/library/compiler-builtins/libm/src/math/fma.rs b/library/compiler-builtins/libm/src/math/fma.rs
index 38468ae755f6..acf99a5d4e23 100644
--- a/library/compiler-builtins/libm/src/math/fma.rs
+++ b/library/compiler-builtins/libm/src/math/fma.rs
@@ -166,13 +166,13 @@ pub fn fma(x: f64, y: f64, z: f64) -> f64 {
             }
             if r == c {
                 /* min normal after rounding, underflow depends
-                   on arch behaviour which can be imitated by
-                   a double to float conversion */
+                on arch behaviour which can be imitated by
+                a double to float conversion */
                 let fltmin: f32 = (x0_ffffff8p_63 * f32::MIN_POSITIVE as f64 * r) as f32;
                 return f64::MIN_POSITIVE / f32::MIN_POSITIVE as f64 * fltmin as f64;
             }
             /* one bit is lost when scaled, add another top bit to
-               only round once at conversion if it is inexact */
+            only round once at conversion if it is inexact */
             if (rhi << 53) != 0 {
                 i = (rhi >> 1 | (rhi & 1) | 1 << 62) as i64;
                 if sign != 0 {
@@ -182,7 +182,7 @@ pub fn fma(x: f64, y: f64, z: f64) -> f64 {
                 r = 2. * r - c; /* remove top bit */
 
                 /* raise underflow portably, such that it
-                   cannot be optimized away */
+                cannot be optimized away */
                 {
                     let tiny: f64 = f64::MIN_POSITIVE / f32::MIN_POSITIVE as f64 * r;
                     r += (tiny * tiny) * (r - r);
diff --git a/library/compiler-builtins/libm/src/math/pow.rs b/library/compiler-builtins/libm/src/math/pow.rs
index 3b789dd9fb30..b5b0407efa19 100644
--- a/library/compiler-builtins/libm/src/math/pow.rs
+++ b/library/compiler-builtins/libm/src/math/pow.rs
@@ -262,7 +262,7 @@ pub fn pow(x: f64, y: f64) -> f64 {
         }
 
         /* now |1-x| is TINY <= 2**-20, suffice to compute
-           log(x) by x-x^2/2+x^3/3-x^4/4 */
+        log(x) by x-x^2/2+x^3/3-x^4/4 */
         let t: f64 = ax - 1.0; /* t has 20 trailing zeros */
         let w: f64 = (t * t) * (0.5 - t * (0.3333333333333333333333 - t * 0.25));
         let u: f64 = IVLN2_H * t; /* ivln2_h has 21 sig. bits */
diff --git a/library/compiler-builtins/libm/src/math/powf.rs b/library/compiler-builtins/libm/src/math/powf.rs
index 5bc5c08e972b..0a26573a3d10 100644
--- a/library/compiler-builtins/libm/src/math/powf.rs
+++ b/library/compiler-builtins/libm/src/math/powf.rs
@@ -198,7 +198,7 @@ pub fn powf(x: f32, y: f32) -> f32 {
         }
 
         /* now |1-x| is TINY <= 2**-20, suffice to compute
-       log(x) by x-x^2/2+x^3/3-x^4/4 */
+        log(x) by x-x^2/2+x^3/3-x^4/4 */
         t = ax - 1.; /* t has 20 trailing zeros */
         w = (t * t) * (0.5 - t * (0.333333333333 - t * 0.25));
         u = IVLN2_H * t; /* IVLN2_H has 16 sig. bits */
diff --git a/library/compiler-builtins/libm/src/math/rem_pio2.rs b/library/compiler-builtins/libm/src/math/rem_pio2.rs
index 98d6b37beb5d..82faf5da97a6 100644
--- a/library/compiler-builtins/libm/src/math/rem_pio2.rs
+++ b/library/compiler-builtins/libm/src/math/rem_pio2.rs
@@ -10,7 +10,6 @@
 // ====================================================
 //
 // Optimized by Bruce D. Evans. */
-
 use super::rem_pio2_large;
 
 // #if FLT_EVAL_METHOD==0 || FLT_EVAL_METHOD==1
diff --git a/library/compiler-builtins/libm/src/math/scalbn.rs b/library/compiler-builtins/libm/src/math/scalbn.rs
index 2c4ab3660848..d8c8409ac10c 100644
--- a/library/compiler-builtins/libm/src/math/scalbn.rs
+++ b/library/compiler-builtins/libm/src/math/scalbn.rs
@@ -19,7 +19,7 @@ pub fn scalbn(x: f64, mut n: i32) -> f64 {
         }
     } else if n < -1022 {
         /* make sure final n < -53 to avoid double
-           rounding in the subnormal range */
+        rounding in the subnormal range */
         y *= x1p_1022 * x1p53;
         n += 1022 - 53;
         if n < -1022 {