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add std.math f16 isfinite support

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refs #1122
This commit is contained in:
Ben Noordhuis 2018-06-30 01:44:54 +02:00
parent a36d7b6131
commit 30b75ae353
1 changed files with 8 additions and 0 deletions
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8
std/math/isfinite.zig
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@ -5,6 +5,10 @@ const assert = std.debug.assert;
pub fn isFinite(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;
@ -20,10 +24,14 @@ pub fn isFinite(x: var) bool {
}
test "math.isFinite" {
assert(isFinite(f16(0.0)));
assert(isFinite(f16(-0.0)));
assert(isFinite(f32(0.0)));
assert(isFinite(f32(-0.0)));
assert(isFinite(f64(0.0)));
assert(isFinite(f64(-0.0)));
assert(!isFinite(math.inf(f16)));
assert(!isFinite(-math.inf(f16)));
assert(!isFinite(math.inf(f32)));
assert(!isFinite(-math.inf(f32)));
assert(!isFinite(math.inf(f64)));