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Simplify math.isnan

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We can just rely on the builtin behavior.
This commit is contained in:
Shawn Landden 2019-04-05 08:47:52 -05:00 committed by Andrew Kelley
parent 1dc6751721
commit aecbd1892a
1 changed files with 1 additions and 22 deletions
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23
std/math/isnan.zig
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@ -4,28 +4,7 @@ const expect = std.testing.expect;
const maxInt = std.math.maxInt;
pub fn isNan(x: var) bool {
const T = @typeOf(x);
switch (T) {
f16 => {
const bits = @bitCast(u16, x);
return (bits & 0x7fff) > 0x7c00;
},
f32 => {
const bits = @bitCast(u32, x);
return bits & 0x7FFFFFFF > 0x7F800000;
},
f64 => {
const bits = @bitCast(u64, x);
return (bits & (maxInt(u64) >> 1)) > (u64(0x7FF) << 52);
},
f128 => {
const bits = @bitCast(u128, x);
return (bits & (maxInt(u128) >> 1)) > (u128(0x7FFF) << 112);
},
else => {
@compileError("isNan not implemented for " ++ @typeName(T));
},
}
return x != x;
}
/// Note: A signalling nan is identical to a standard nan right now but may have a different bit