r191928 - in /trunk/gcc: ChangeLog simplify-rtx...

[uros@gcc.gnu.org]

Author: uros
Date: Mon Oct  1 15:00:41 2012
New Revision: 191928

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=191928
Log:
        PR rtl-optimization/54457
        * simplify-rtx.c (simplify_subreg):
	Simplify (subreg:M (op:N ((x:N) (y:N)), 0)
     	to (op:M (subreg:M (x:N) 0) (subreg:M (x:N) 0)), where
	the outer subreg is effectively a truncation to the original mode M.

testsuite/ChangeLog:

        PR rtl-optimization/54457
        * gcc.target/i386/pr54457.c: New test.


Added:
    trunk/gcc/testsuite/gcc.target/i386/pr54457.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/simplify-rtx.c
    trunk/gcc/testsuite/ChangeLog