Re: combine: division by zero

[Andrew Haley <aph at cambridge dot redhat dot com>]

Richard Henderson writes:
 > On Thu, Jun 14, 2001 at 09:05:39PM +0100, Andrew Haley wrote:
 > > While this may be acceptable for C, it isn't for some other languages
 > > (certainly Java, perhaps also Ada) and the insn should be retained so
 > > that it can trigger a divide overflow signal at run time.
 > 
 > For C, division by zero is undefined, so technically we
 > can do anything.  Silently discarding the division doesn't
 > seem like the most useful "anything" we could be doing.
 > 
 > > 	* combine.c (nonzero_bits): Don't optimize away division by zero.
 > 
 > Ok for mainline.  Branch-wise, I imagine Mark will want
 > this to wait for 3.0.1.

We have a good enough workaround for 3.0 already.

Thanks,
Andrew.