const std = @import("../std.zig");
const math = std.math;
const expect = std.testing.expect;
pub fn signbit(x: anytype) bool {
const T = @TypeOf(x);
const TBits = std.meta.Int(.unsigned, @typeInfo(T).Float.bits);
return @bitCast(TBits, x) >> (@bitSizeOf(T) - 1) != 0;
}
test "math.signbit" {
inline for ([_]type{ f16, f32, f64, f80, f128 }) |T| {
try expect(!signbit(@as(T, 0.0)));
try expect(!signbit(@as(T, 1.0)));
try expect(signbit(@as(T, -2.0)));
try expect(signbit(@as(T, -0.0)));
try expect(!signbit(math.inf(T)));
try expect(signbit(-math.inf(T)));
try expect(!signbit(math.nan(T)));
try expect(signbit(-math.nan(T)));
}
}