[Bug c/49820] Explicit check for integer negative after abs optimized away

[schwab@linux-m68k.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49820

Andreas Schwab <schwab@linux-m68k.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID

--- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> 2011-07-23 07:20:20 UTC ---
Integer overflow is undefined. You have to check before the fact, or compile
with -fwrapv.