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better f64_is_nan

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MovingtoMars 2016-01-29 21:12:33 +13:00
parent 90a32629c0
commit 850f6d2d02
1 changed files with 5 additions and 1 deletions
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6
std/math.zig
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@ -17,7 +17,11 @@ pub fn f64_get_neg_inf() -> f64 {
}
pub fn f64_is_nan(f: f64) -> bool {
0x7FFFFFFFFFFFFFFF == f64_to_bits(f) // TODO improve to catch all cases
const bits = f64_to_bits(f);
const exp: i64 = i64((bits >> 52) & ((1 << 11) - 1));
const sig = (bits & ((1 << 52) - 1)) | (1 << 52);
sig != 0 && exp == (1 << 11) - 1
}
pub fn f64_is_inf(f: f64) -> bool {