> Unfortunately this breaks quite a lot of things.

Right, for example in Ada where we now happily turn a division by zero, which 
should raise an exception with -gnatp, into nonsense.  Do we really need this 
rather useless optimization in GCC?  Blindly mimicing LLVM is not a reason...

I have installed the attached testcase, which now fails because of the change.

	* gnat.dg/div_zero.adb: New test.

-- 
Eric Botcazou