37 lines
1.3 KiB
Rust
37 lines
1.3 KiB
Rust
#![feature(core_intrinsics)]
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use std::io::Write;
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use std::intrinsics;
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fn checked_div_i128(lhs: i128, rhs: i128) -> Option<i128> {
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if rhs == 0 || (lhs == -170141183460469231731687303715884105728 && rhs == -1) {
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None
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} else {
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Some(unsafe { intrinsics::unchecked_div(lhs, rhs) })
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}
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}
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fn checked_div_u128(lhs: u128, rhs: u128) -> Option<u128> {
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match rhs {
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0 => None,
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rhs => Some(unsafe { intrinsics::unchecked_div(lhs, rhs) })
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}
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}
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fn main() {
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assert_eq!(0b0000000000000000000000000010000010000000000000000000000000000000_0000000000100000000000000000000000001000000000000100000000000000u128.leading_zeros(), 26);
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assert_eq!(0b0000000000000000000000000010000000000000000000000000000000000000_0000000000000000000000000000000000001000000000000000000010000000u128.trailing_zeros(), 7);
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checked_div_i128(0i128, 2i128);
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checked_div_u128(0u128, 2u128);
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assert_eq!(1u128 + 2, 3);
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// overflow panic
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// 0xFEDCBA987654321123456789ABCDEFu128 + 0xFEDCBA987654321123456789ABCDEFu128;
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println!("{}", 0b100010000000000000000000000000000u128 >> 10);
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println!("{}", 0xFEDCBA987654321123456789ABCDEFu128 >> 64);
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println!("{} >> 64 == {}", 0xFEDCBA987654321123456789ABCDEFu128 as i128, 0xFEDCBA987654321123456789ABCDEFu128 as i128 >> 64);
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println!("{}", 353985398u128 * 932490u128);
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}
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