[PATCH] (Partial) Implementation of simplificaiton of CSHIFT

[Steve Kargl]

On Thu, Nov 19, 2015 at 04:58:36PM -0800, Steve Kargl wrote:
> 
> 2015-11-19  Steven G. Kargl  <kargl@gcc.gnu.org>
> 
> 	* intrinsic.h: Prototype for gfc_simplify_cshift
> 	* intrinsic.c (add_functions): Use gfc_simplify_cshift.
> 	* simplify.c (gfc_simplify_cshift): Implement simplification of CSHIFT.
> 	(gfc_simplify_spread): Remove a FIXME and add error condition.
>  
> 2015-11-19  Steven G. Kargl  <kargl@gcc.gnu.org>
> 
> 	* gfortran.dg/simplify_cshift_1.f90: New test.
> 

I've attached an updated patch.  The changes consists of
1) better/more comments
2) re-organize code to reduce copying of the array.
3) add optimization for a left/right shift that 
   returns the original array.
4) Don't leak memory.

-- 
Steve
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