const __fixdfti = @import("fixdfti.zig").__fixdfti;
const std = @import("std");
const math = std.math;
const testing = std.testing;
const warn = std.debug.warn;

fn test__fixdfti(a: f64, expected: i128) void {
    const x = __fixdfti(a);
    //warn("a={}:{x} x={}:{x} expected={}:{x}:@as(u64, {x})\n", .{a, @bitCast(u64, a), x, x, expected, expected, @bitCast(u128, expected)});
    testing.expect(x == expected);
}

test "fixdfti" {
    //warn("\n", .{});
    test__fixdfti(-math.f64_max, math.minInt(i128));

    test__fixdfti(-0x1.FFFFFFFFFFFFFp+1023, math.minInt(i128));
    test__fixdfti(-0x1.FFFFFFFFFFFFFp+1023, -0x80000000000000000000000000000000);

    test__fixdfti(-0x1.0000000000000p+127, -0x80000000000000000000000000000000);
    test__fixdfti(-0x1.FFFFFFFFFFFFFp+126, -0x7FFFFFFFFFFFFC000000000000000000);
    test__fixdfti(-0x1.FFFFFFFFFFFFEp+126, -0x7FFFFFFFFFFFF8000000000000000000);

    test__fixdfti(-0x1.0000000000001p+63, -0x8000000000000800);
    test__fixdfti(-0x1.0000000000000p+63, -0x8000000000000000);
    test__fixdfti(-0x1.FFFFFFFFFFFFFp+62, -0x7FFFFFFFFFFFFC00);
    test__fixdfti(-0x1.FFFFFFFFFFFFEp+62, -0x7FFFFFFFFFFFF800);

    test__fixdfti(-0x1.FFFFFEp+62, -0x7fffff8000000000);
    test__fixdfti(-0x1.FFFFFCp+62, -0x7fffff0000000000);

    test__fixdfti(-2.01, -2);
    test__fixdfti(-2.0, -2);
    test__fixdfti(-1.99, -1);
    test__fixdfti(-1.0, -1);
    test__fixdfti(-0.99, 0);
    test__fixdfti(-0.5, 0);
    test__fixdfti(-math.f64_min, 0);
    test__fixdfti(0.0, 0);
    test__fixdfti(math.f64_min, 0);
    test__fixdfti(0.5, 0);
    test__fixdfti(0.99, 0);
    test__fixdfti(1.0, 1);
    test__fixdfti(1.5, 1);
    test__fixdfti(1.99, 1);
    test__fixdfti(2.0, 2);
    test__fixdfti(2.01, 2);

    test__fixdfti(0x1.FFFFFCp+62, 0x7FFFFF0000000000);
    test__fixdfti(0x1.FFFFFEp+62, 0x7FFFFF8000000000);

    test__fixdfti(0x1.FFFFFFFFFFFFEp+62, 0x7FFFFFFFFFFFF800);
    test__fixdfti(0x1.FFFFFFFFFFFFFp+62, 0x7FFFFFFFFFFFFC00);
    test__fixdfti(0x1.0000000000000p+63, 0x8000000000000000);
    test__fixdfti(0x1.0000000000001p+63, 0x8000000000000800);

    test__fixdfti(0x1.FFFFFFFFFFFFEp+126, 0x7FFFFFFFFFFFF8000000000000000000);
    test__fixdfti(0x1.FFFFFFFFFFFFFp+126, 0x7FFFFFFFFFFFFC000000000000000000);
    test__fixdfti(0x1.0000000000000p+127, 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF);

    test__fixdfti(0x1.FFFFFFFFFFFFFp+1023, 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF);
    test__fixdfti(0x1.FFFFFFFFFFFFFp+1023, math.maxInt(i128));

    test__fixdfti(math.f64_max, math.maxInt(i128));
}