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c: Add tests for generic_fmod implementation

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LemonBoy 2021-04-20 15:43:01 +02:00
parent 63304a871e
commit c7c77fb1b0
1 changed files with 21 additions and 0 deletions
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lib/std/special/c.zig
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@ -859,6 +859,27 @@ fn generic_fmod(comptime T: type, x: T, y: T) T {
return @bitCast(T, ux);
}
test "fmod, fmodf" {
inline for ([_]type{ f32, f64 }) |T| {
const nan_val = math.nan(T);
const inf_val = math.inf(T);
std.testing.expect(isNan(generic_fmod(T, nan_val, 1.0)));
std.testing.expect(isNan(generic_fmod(T, 1.0, nan_val)));
std.testing.expect(isNan(generic_fmod(T, inf_val, 1.0)));
std.testing.expect(isNan(generic_fmod(T, 0.0, 0.0)));
std.testing.expect(isNan(generic_fmod(T, 1.0, 0.0)));
std.testing.expectEqual(@as(T, 0.0), generic_fmod(T, 0.0, 2.0));
std.testing.expectEqual(@as(T, -0.0), generic_fmod(T, -0.0, 2.0));
std.testing.expectEqual(@as(T, -2.0), generic_fmod(T, -32.0, 10.0));
std.testing.expectEqual(@as(T, -2.0), generic_fmod(T, -32.0, -10.0));
std.testing.expectEqual(@as(T, 2.0), generic_fmod(T, 32.0, 10.0));
std.testing.expectEqual(@as(T, 2.0), generic_fmod(T, 32.0, -10.0));
}
}
// NOTE: The original code is full of implicit signed -> unsigned assumptions and u32 wraparound
// behaviour. Most intermediate i32 values are changed to u32 where appropriate but there are
// potentially some edge cases remaining that are not handled in the same way.