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Cosmetic fixes.

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This commit is contained in:
Falk Hüffner 2021-09-09 20:06:46 +02:00
parent d53c483502
commit 57c623570a
2 changed files with 8 additions and 10 deletions
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2
library/core/benches/num/int_log/mod.rs
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@ -1,5 +1,3 @@
#![feature(int_log)]
use rand::Rng;
use test::{black_box, Bencher};

16
library/core/src/num/int_log10.rs
View File

@ -7,16 +7,16 @@ mod unchecked {
// in the bits above the low 8 bits.
// Adding c1 to val gives 10 in the top bits for val < 10, 11 for val >= 10
let c1 = 0b11_00000000 - 10; // 758
const C1: u32 = 0b11_00000000 - 10; // 758
// Adding c2 to val gives 01 in the top bits for val < 100, 10 for val >= 100
let c2 = 0b10_00000000 - 100; // 412
const C2: u32 = 0b10_00000000 - 100; // 412
// Value of top bits:
// +c1 +c2 1&2
// 0..=9 10 01 00 = 0
// 10..=99 11 01 01 = 1
// 100..=255 11 10 10 = 2
((val + c1) & (val + c2)) >> 8
((val + C1) & (val + C2)) >> 8
}
// 0 < val < 100_000
@ -24,10 +24,10 @@ mod unchecked {
// Similar to u8, when adding one of these constants to val,
// we get two possible bit patterns above the low 17 bits,
// depending on whether val is below or above the threshold.
let c1 = 0b011_00000000000000000 - 10; // 393206
let c2 = 0b100_00000000000000000 - 100; // 524188
let c3 = 0b111_00000000000000000 - 1000; // 916504
let c4 = 0b100_00000000000000000 - 10000; // 514288
const C1: u32 = 0b011_00000000000000000 - 10; // 393206
const C2: u32 = 0b100_00000000000000000 - 100; // 524188
const C3: u32 = 0b111_00000000000000000 - 1000; // 916504
const C4: u32 = 0b100_00000000000000000 - 10000; // 514288
// Value of top bits:
// +c1 +c2 1&2 +c3 +c4 3&4 ^
@ -36,7 +36,7 @@ mod unchecked {
// 100..=999 011 100 000 110 011 010 010 = 2
// 1000..=9999 011 100 000 111 011 011 011 = 3
// 10000..=99999 011 100 000 111 100 100 100 = 4
(((val + c1) & (val + c2)) ^ ((val + c3) & (val + c4))) >> 17
(((val + C1) & (val + C2)) ^ ((val + C3) & (val + C4))) >> 17
}
// 0 < val <= u16::MAX