https://bugs.llvm.org/show_bug.cgi?id=41552
Bug ID: 41552
Summary: different result from __builtin_add_overflow in
constant expresion
Product: clang
Version: 7.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected]
Description:
Normally, when passing a combination of large signed and unsigned integer
values to the generic overload of __builtin_add_overflow and requesting back an
unsigned integer, the function correctly identifies overflow. When the same
operation takes place in a constant expression, __builtin_add_overflow fails to
identify that the overflow took place.
Example:
https://wandbox.org/permlink/hDCXNEThgH3NmdLz
Affected:
This affects 7.x and upward. Earlier versions do not support
__builtin_add_overflow in constant expressions.
This affects C++14 and later. A repro for C++11 is not possible due to
limitations imposed on constexpr fns.
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