44 lines
1.5 KiB
Rust
44 lines
1.5 KiB
Rust
//@ run-pass
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const LEFT: u32 = 0x10000b3u32.rotate_left(8);
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const RIGHT: u32 = 0xb301u32.rotate_right(8);
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// Rotating these should make no difference
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//
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// We test using 124 bits because to ensure that overlong bit shifts do
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// not cause undefined behaviour. See #10183.
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const LEFT_OVERFLOW: i16 = 0i16.rotate_left(124);
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const RIGHT_OVERFLOW: i16 = 0i16.rotate_right(124);
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const ONE_LEFT_OVERFLOW: u16 = 1u16.rotate_left(124);
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const ONE_RIGHT_OVERFLOW: u16 = 1u16.rotate_right(124);
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const NON_ZERO_LEFT_OVERFLOW: u16 = 0b10u16.rotate_left(124);
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const NON_ZERO_RIGHT_OVERFLOW: u16 = 0b10u16.rotate_right(124);
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// Rotating by 0 should have no effect
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const ZERO_ROTATE_LEFT: i8 = 0b0010_0001i8.rotate_left(0);
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const ZERO_ROTATE_RIGHT: i8 = 0b0111_1001i8.rotate_right(0);
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// Rotating by a multiple of word size should also have no effect
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const MULTIPLE_ROTATE_LEFT: i32 = 0b0010_0001i32.rotate_left(128);
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const MULTIPLE_ROTATE_RIGHT: i32 = 0b0010_0001i32.rotate_right(128);
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fn main() {
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assert_eq!(LEFT, 0xb301);
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assert_eq!(RIGHT, 0x0100_00b3);
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assert_eq!(LEFT_OVERFLOW, 0);
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assert_eq!(RIGHT_OVERFLOW, 0);
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assert_eq!(ONE_LEFT_OVERFLOW, 0b0001_0000_0000_0000);
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assert_eq!(ONE_RIGHT_OVERFLOW, 0b0001_0000);
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assert_eq!(NON_ZERO_LEFT_OVERFLOW, 0b0010_0000_0000_0000);
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assert_eq!(NON_ZERO_RIGHT_OVERFLOW, 0b0000_0000_0010_0000);
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assert_eq!(ZERO_ROTATE_LEFT, 0b0010_0001);
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assert_eq!(ZERO_ROTATE_RIGHT, 0b0111_1001);
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assert_eq!(MULTIPLE_ROTATE_LEFT, 0b0010_0001);
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assert_eq!(MULTIPLE_ROTATE_RIGHT, 0b0010_0001);
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}
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