    const std = @import("../std.zig");
    const math = std.math;
    const expect = std.testing.expect;

    /// Returns whether x is a finite value.
    pub fn isFinite(x: anytype) bool {
        const T = @TypeOf(x);
        const TBits = std.meta.Int(.unsigned, @typeInfo(T).Float.bits);
        const remove_sign = ~@as(TBits, 0) >> 1;
        return @as(TBits, @bitCast(x)) & remove_sign < @as(TBits, @bitCast(math.inf(T)));
    }

    test "math.isFinite" {
        inline for ([_]type{ f16, f32, f64, f80, f128 }) |T| {
            // normals

            try expect(isFinite(@as(T, 1.0)));
            try expect(isFinite(-@as(T, 1.0)));

            // zero & subnormals

            try expect(isFinite(@as(T, 0.0)));
            try expect(isFinite(@as(T, -0.0)));
            try expect(isFinite(math.floatTrueMin(T)));

            // other float limits

            try expect(isFinite(math.floatMin(T)));
            try expect(isFinite(math.floatMax(T)));

            // inf & nan

            try expect(!isFinite(math.inf(T)));
            try expect(!isFinite(-math.inf(T)));
            try expect(!isFinite(math.nan(T)));
            try expect(!isFinite(-math.nan(T)));
        }
    }