authorgravatar for thatlemon@gmail.comLemonBoy <thatlemon@gmail.com> 2021-04-20 15:43:01+02:00
committergravatar for thatlemon@gmail.comLemonBoy <thatlemon@gmail.com> 2021-04-20 15:43:01+02:00
logc7c77fb1b049070f9bf4009a36c9e563783fab62
treeba45d0c28e6d4c285e911cab3905e3a86a32ce30
parent63304a871e3837f407943ac8eb63073fdc89f0fd

c: Add tests for generic_fmod implementation

1 files changed, 21 insertions(+), 0 deletions(-)

lib/std/special/c.zig+21
......@@ -859,6 +859,27 @@ fn generic_fmod(comptime T: type, x: T, y: T) T {
859859 return @bitCast(T, ux);
860860}
861861
862test "fmod, fmodf" {
863 inline for ([_]type{ f32, f64 }) |T| {
864 const nan_val = math.nan(T);
865 const inf_val = math.inf(T);
866
867 std.testing.expect(isNan(generic_fmod(T, nan_val, 1.0)));
868 std.testing.expect(isNan(generic_fmod(T, 1.0, nan_val)));
869 std.testing.expect(isNan(generic_fmod(T, inf_val, 1.0)));
870 std.testing.expect(isNan(generic_fmod(T, 0.0, 0.0)));
871 std.testing.expect(isNan(generic_fmod(T, 1.0, 0.0)));
872
873 std.testing.expectEqual(@as(T, 0.0), generic_fmod(T, 0.0, 2.0));
874 std.testing.expectEqual(@as(T, -0.0), generic_fmod(T, -0.0, 2.0));
875
876 std.testing.expectEqual(@as(T, -2.0), generic_fmod(T, -32.0, 10.0));
877 std.testing.expectEqual(@as(T, -2.0), generic_fmod(T, -32.0, -10.0));
878 std.testing.expectEqual(@as(T, 2.0), generic_fmod(T, 32.0, 10.0));
879 std.testing.expectEqual(@as(T, 2.0), generic_fmod(T, 32.0, -10.0));
880 }
881}
882
862883// NOTE: The original code is full of implicit signed -> unsigned assumptions and u32 wraparound
863884// behaviour. Most intermediate i32 values are changed to u32 where appropriate but there are
864885// potentially some edge cases remaining that are not handled in the same way.