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std: Implement copysign for f128

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This commit is contained in:
LemonBoy 2021-04-29 09:00:29 +02:00
parent 9f6edfd201
commit 236dba8ba9
1 changed files with 18 additions and 0 deletions
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18
lib/std/math/copysign.zig
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@ -20,6 +20,7 @@ pub fn copysign(comptime T: type, x: T, y: T) T {
f16 => copysign16(x, y),
f32 => copysign32(x, y),
f64 => copysign64(x, y),
f128 => copysign128(x, y),
else => @compileError("copysign not implemented for " ++ @typeName(T)),
};
}
@ -51,10 +52,20 @@ fn copysign64(x: f64, y: f64) f64 {
return @bitCast(f64, h1 | h2);
}
fn copysign128(x: f128, y: f128) f128 {
const ux = @bitCast(u128, x);
const uy = @bitCast(u128, y);
const h1 = ux & (maxInt(u128) / 2);
const h2 = uy & (@as(u128, 1) << 127);
return @bitCast(f128, h1 | h2);
}
test "math.copysign" {
expect(copysign(f16, 1.0, 1.0) == copysign16(1.0, 1.0));
expect(copysign(f32, 1.0, 1.0) == copysign32(1.0, 1.0));
expect(copysign(f64, 1.0, 1.0) == copysign64(1.0, 1.0));
expect(copysign(f128, 1.0, 1.0) == copysign128(1.0, 1.0));
}
test "math.copysign16" {
@ -77,3 +88,10 @@ test "math.copysign64" {
expect(copysign64(-5.0, -1.0) == -5.0);
expect(copysign64(-5.0, 1.0) == 5.0);
}
test "math.copysign128" {
expect(copysign128(5.0, 1.0) == 5.0);
expect(copysign128(5.0, -1.0) == -5.0);
expect(copysign128(-5.0, -1.0) == -5.0);
expect(copysign128(-5.0, 1.0) == 5.0);
}