[llvm-bugs] [Bug 46407] New: Failure to optimize __builtin_add_overflow return value to constant when possible

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46407

            Bug ID: 46407
           Summary: Failure to optimize __builtin_add_overflow return
                    value to constant when possible
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedb...@nondot.org
          Reporter: gabrav...@gmail.com
                CC: llvm-bugs@lists.llvm.org

int f(int a, int b)
{
    return __builtin_add_overflow(12312321321321l, a, &b);
}

This can be optimized to `return 1`. This transformation is done by GCC, but
not by LLVM.

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