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add std.math f16 isnormal support

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refs #1122
This commit is contained in:
Ben Noordhuis 2018-06-30 01:44:54 +02:00
parent 30b75ae353
commit f36b095b5f
1 changed files with 9 additions and 0 deletions
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9
std/math/isnormal.zig
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@ -5,6 +5,10 @@ const assert = std.debug.assert;
pub fn isNormal(x: var) bool {
const T = @typeOf(x);
switch (T) {
f16 => {
const bits = @bitCast(u16, x);
return (bits + 1024) & 0x7FFF >= 2048;
},
f32 => {
const bits = @bitCast(u32, x);
return (bits + 0x00800000) & 0x7FFFFFFF >= 0x01000000;
@ -20,8 +24,13 @@ pub fn isNormal(x: var) bool {
}
test "math.isNormal" {
assert(!isNormal(math.nan(f16)));
assert(!isNormal(math.nan(f32)));
assert(!isNormal(math.nan(f64)));
assert(!isNormal(f16(0)));
assert(!isNormal(f32(0)));
assert(!isNormal(f64(0)));
assert(isNormal(f16(1.0)));
assert(isNormal(f32(1.0)));
assert(isNormal(f64(1.0)));
}