56 lines
1.3 KiB
Zig
56 lines
1.3 KiB
Zig
pub enum Cmp {
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Equal,
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Greater,
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Less,
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}
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pub fn f64_from_bits(bits: u64) -> f64 {
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*(&f64)(&bits)
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}
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pub fn f64_to_bits(f: f64) -> u64 {
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*(&u64)(&f)
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}
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pub fn f64_get_pos_inf() -> f64 {
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f64_from_bits(0x7FF0000000000000)
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}
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pub fn f64_get_neg_inf() -> f64 {
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f64_from_bits(0xFFF0000000000000)
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}
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pub fn f64_is_nan(f: f64) -> bool {
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const bits = f64_to_bits(f);
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const exp: i64 = i64((bits >> 52) & ((1 << 11) - 1));
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const sig = (bits & ((1 << 52) - 1)) | (1 << 52);
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sig != 0 && exp == (1 << 11) - 1
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}
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pub fn f64_is_inf(f: f64) -> bool {
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f == f64_get_neg_inf() || f == f64_get_pos_inf()
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}
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pub fn min(inline T: type, x: T, y: T) -> T {
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if (x < y) x else y
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}
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pub fn max(inline T: type, x: T, y: T) -> T {
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if (x > y) x else y
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}
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pub error Overflow;
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pub fn mul_overflow(inline T: type, a: T, b: T) -> %T {
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var answer: T = undefined;
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if (@mul_with_overflow(T, a, b, &answer)) error.Overflow else answer
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}
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pub fn add_overflow(inline T: type, a: T, b: T) -> %T {
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var answer: T = undefined;
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if (@add_with_overflow(T, a, b, &answer)) error.Overflow else answer
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}
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pub fn sub_overflow(inline T: type, a: T, b: T) -> %T {
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var answer: T = undefined;
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if (@sub_with_overflow(T, a, b, &answer)) error.Overflow else answer
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}
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