[PATCH] Handle REALPART_EXPR and IMAGPART_EXPR for Store_CCP

[Andrew Pinski <pinskia at physics dot uc dot edu>]

I noticed that store CCP was not handling REALPART_EXPR when the full 
expression was
initialized as a constant.
So we have t = __complex__ (0.0, 0.0);
USE (__real__ t);

But we did not propagate 0.0 into the use as we would not recognized 
that for
REALPART_EXPR <t> would use only part of t.  So I added the checking for
REALPART_EXPR and IMAGPART_EXPR specially to ccp_fold for the store_ccp 
case.

OK? Bootstrap and tested on powerpc-darwin and x86_64-linux.

Thanks,
Andrew Pinski


ChangeLog:
	* tree-ssa-ccp.c (ccp_fold): Handle store CCP of REALPART_EXPR and
	IMAGPART_EXPR.

	* testsuite/gcc.dg/tree-ssa/complex-3.c: New test.

Attachment: fixrealpart.diff.txt
Description: Text document