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Auto merge of #2044 - RalfJung:int_log, r=RalfJung

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test int_log functions

I'll have to disable many of their tests in libcore since they take too long, so let's add some of them back on our side here.
This commit is contained in:
bors 2022-03-31 15:22:18 +00:00
commit 6e1ed17295
2 changed files with 30 additions and 1 deletions
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2
rust-version
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@ -1 +1 @@
100f12d17026fccfc5d80527b5976dd66b228b13
df20355fa9fa5e9fb89be4e4bfee8a643bb7a23e

29
tests/run-pass/integer-ops.rs
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@ -1,4 +1,5 @@
// compile-flags: -Coverflow-checks=off
#![feature(int_log)]
#![allow(arithmetic_overflow)]
pub fn main() {
@ -171,4 +172,32 @@ pub fn main() {
assert_eq!(10i8.overflowing_abs(), (10,false));
assert_eq!((-10i8).overflowing_abs(), (10,false));
assert_eq!((-128i8).overflowing_abs(), (-128,true));
// Logarithms
macro_rules! test_log {
($type:ident, $max_log2:expr, $max_log10:expr) => {
assert_eq!($type::MIN.checked_log2(), None);
assert_eq!($type::MIN.checked_log10(), None);
assert_eq!($type::MAX.checked_log2(), Some($max_log2));
assert_eq!($type::MAX.checked_log10(), Some($max_log10));
}
}
test_log!(i8, 6, 2);
test_log!(u8, 7, 2);
test_log!(i16, 14, 4);
test_log!(u16, 15, 4);
test_log!(i32, 30, 9);
test_log!(u32, 31, 9);
test_log!(i64, 62, 18);
test_log!(u64, 63, 19);
test_log!(i128, 126, 38);
test_log!(u128, 127, 38);
for i in (1..=i16::MAX).step_by(i8::MAX as usize) {
assert_eq!(i.checked_log(13), Some((i as f32).log(13.0) as u32));
}
for i in (1..=u16::MAX).step_by(i8::MAX as usize) {
assert_eq!(i.checked_log(13), Some((i as f32).log(13.0) as u32));
}
}