26 lines
773 B
Rust
26 lines
773 B
Rust
// run-pass
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// compile-flags: -O
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// Make sure arithmetic unary/binary ops actually return the right result, even when overflowing.
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// We have to put them in `const fn` and turn on optimizations to avoid overflow checks.
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const fn add(x: i8, y: i8) -> i8 { x+y }
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const fn sub(x: i8, y: i8) -> i8 { x-y }
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const fn mul(x: i8, y: i8) -> i8 { x*y }
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// div and rem are always checked, so we cannot test their result in case of overflow.
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const fn neg(x: i8) -> i8 { -x }
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fn main() {
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const ADD_OFLOW: i8 = add(100, 100);
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assert_eq!(ADD_OFLOW, -56);
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const SUB_OFLOW: i8 = sub(100, -100);
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assert_eq!(SUB_OFLOW, -56);
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const MUL_OFLOW: i8 = mul(-100, -2);
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assert_eq!(MUL_OFLOW, -56);
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const NEG_OFLOW: i8 = neg(-128);
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assert_eq!(NEG_OFLOW, -128);
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}
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