Tree tail merging breaks __builtin_unreachable optimization

[Ulrich Weigand]

Tom de Vries wrote:

> 2012-07-06  Tom de Vries  <tom@codesourcery.com>
> 	    Richard Guenther  <rguenther@suse.de>
> 
> 	* tree-ssa-ccp.c (optimize_unreachable): New function.
> 	(execute_fold_all_builtins): Use optimize_unreachable to optimize
> 	BUILT_IN_UNREACHABLE.  Don't optimize after BUILT_IN_UNREACHABLE.
> 
> 	* gcc.dg/builtin-unreachable-6.c: New test.
> 	* gcc.dg/builtin-unreachable-5.c: New test.

Many thanks for taking care of this!

Bye,
Ulrich

-- 
  Dr. Ulrich Weigand
  GNU Toolchain for Linux on System z and Cell BE
  Ulrich.Weigand@de.ibm.com