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add std.math f16 signbit support

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refs #1122
This commit is contained in:
Ben Noordhuis 2018-06-30 01:44:54 +02:00
parent ca444e6191
commit be36179064
1 changed files with 12 additions and 0 deletions
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12
std/math/signbit.zig
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@ -5,12 +5,18 @@ const assert = std.debug.assert;
pub fn signbit(x: var) bool {
const T = @typeOf(x);
return switch (T) {
f16 => signbit16(x),
f32 => signbit32(x),
f64 => signbit64(x),
else => @compileError("signbit not implemented for " ++ @typeName(T)),
};
}
fn signbit16(x: f16) bool {
const bits = @bitCast(u16, x);
return bits >> 15 != 0;
}
fn signbit32(x: f32) bool {
const bits = @bitCast(u32, x);
return bits >> 31 != 0;
@ -22,10 +28,16 @@ fn signbit64(x: f64) bool {
}
test "math.signbit" {
assert(signbit(f16(4.0)) == signbit16(4.0));
assert(signbit(f32(4.0)) == signbit32(4.0));
assert(signbit(f64(4.0)) == signbit64(4.0));
}
test "math.signbit16" {
assert(!signbit16(4.0));
assert(signbit16(-3.0));
}
test "math.signbit32" {
assert(!signbit32(4.0));
assert(signbit32(-3.0));