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std: Implement signbit for f128

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This commit is contained in:
LemonBoy 2021-03-23 09:17:57 +01:00
parent 718b43504e
commit 9f6edfd201
1 changed files with 12 additions and 0 deletions
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12
lib/std/math/signbit.zig
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@ -14,6 +14,7 @@ pub fn signbit(x: anytype) bool {
f16 => signbit16(x), f16 => signbit16(x),
f32 => signbit32(x), f32 => signbit32(x),
f64 => signbit64(x), f64 => signbit64(x),
f128 => signbit128(x),
else => @compileError("signbit not implemented for " ++ @typeName(T)), else => @compileError("signbit not implemented for " ++ @typeName(T)),
}; };
} }
@ -33,10 +34,16 @@ fn signbit64(x: f64) bool {
return bits >> 63 != 0; return bits >> 63 != 0;
} }
fn signbit128(x: f128) bool {
const bits = @bitCast(u128, x);
return bits >> 127 != 0;
}
test "math.signbit" { test "math.signbit" {
expect(signbit(@as(f16, 4.0)) == signbit16(4.0)); expect(signbit(@as(f16, 4.0)) == signbit16(4.0));
expect(signbit(@as(f32, 4.0)) == signbit32(4.0)); expect(signbit(@as(f32, 4.0)) == signbit32(4.0));
expect(signbit(@as(f64, 4.0)) == signbit64(4.0)); expect(signbit(@as(f64, 4.0)) == signbit64(4.0));
expect(signbit(@as(f128, 4.0)) == signbit128(4.0));
} }
test "math.signbit16" { test "math.signbit16" {
@ -53,3 +60,8 @@ test "math.signbit64" {
expect(!signbit64(4.0)); expect(!signbit64(4.0));
expect(signbit64(-3.0)); expect(signbit64(-3.0));
} }
test "math.signbit128" {
expect(!signbit128(4.0));
expect(signbit128(-3.0));
}