Miri is really slow

src/libcore/tests/num/dec2flt/mod.rs

@@ -77,6 +77,7 @@ fn infinity() {
 fn zero() {
     test_literal!(0.0);
     test_literal!(1e-325);
+    #[cfg(not(miri))] // Miri is too slow
     test_literal!(1e-326);
     #[cfg(not(miri))] // Miri is too slow
     test_literal!(1e-500);

src/libcore/tests/num/flt2dec/estimator.rs

@@ -45,7 +45,7 @@ fn test_estimate_scaling_factor() {
     #[cfg(not(miri))] // Miri is too slow
     let iter = -1074..972;
     #[cfg(miri)]
-    let iter = (-1074..972).step_by(11);
+    let iter = (-1074..972).step_by(37);
 
     for i in iter {
         let expected = super::ldexp_f64(1.0, i).log10().ceil();

src/libcore/tests/num/flt2dec/random.rs

@@ -112,7 +112,7 @@ fn shortest_random_equivalence_test() {
     #[cfg(not(miri))] // Miri is too slow
     const N: usize = 10_000;
     #[cfg(miri)]
-    const N: usize = 20;
+    const N: usize = 10;
 
     f64_random_equivalence_test(format_shortest_opt, fallback, MAX_SIG_DIGITS, N);
     f32_random_equivalence_test(format_shortest_opt, fallback, MAX_SIG_DIGITS, N);
@@ -146,7 +146,7 @@ fn exact_f32_random_equivalence_test() {
     #[cfg(not(miri))] // Miri is too slow
     const N: usize = 1_000;
     #[cfg(miri)]
-    const N: usize = 10;
+    const N: usize = 3;
 
     for k in 1..21 {
         f32_random_equivalence_test(|d, buf| format_exact_opt(d, buf, i16::MIN),
@@ -160,7 +160,7 @@ fn exact_f64_random_equivalence_test() {
     #[cfg(not(miri))] // Miri is too slow
     const N: usize = 1_000;
     #[cfg(miri)]
-    const N: usize = 5;
+    const N: usize = 3;
 
     for k in 1..21 {
         f64_random_equivalence_test(|d, buf| format_exact_opt(d, buf, i16::MIN),