| Issue |
204212
|
| Summary |
[libc++] std::abs does not accept __int128 or signed _BitInt(N)
|
| Labels |
libc++
|
| Assignees |
|
| Reporter |
xroche
|
## Summary
`std::abs` has no overload for `__int128` or for `_BitInt(N)` (integers with a programmer-chosen bit width). Calling `std::abs` on either does not compile: the call is ambiguous. Both are common types for arithmetic wider than 64 bits, so the gap is easy to hit.
## Reproducer
https://godbolt.org/z/hWKo3xzee
```cpp
#include <cstdlib>
int main() {
__int128 x = -5;
return (int)std::abs(x); // error: call to 'abs' is ambiguous
}
```
With no integer overload that fits, the compiler falls back to the `float`, `double`, and `long double` ones and cannot choose between them.
## Fix
PR #196532 adds `std::abs` overloads for `__int128` and signed `_BitInt(N)`.
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