r239549 - in /trunk/gcc: ChangeLog reload.c tes...

[amodra@gcc.gnu.org]

Author: amodra
Date: Wed Aug 17 22:41:22 2016
New Revision: 239549

URL: https://gcc.gnu.org/viewcvs?rev=239549&root=gcc&view=rev
Log:
[RELOAD] Don't assume subreg mem address is ok

This patch fixes a case where reload blindly assumes a subreg mem is
OK if its address has been partially reloaded by legitimize_reload_address.

	PR rtl-optimization/72771
	* reload.c (find_reloads): Don't assume that a subreg mem is OK
	when find_reloads_toplev returns address_reloaded==-1.
	(alternative_allows_const_pool_ref): Update comment.
testsuite/
	* gcc.c-torture/compile/pr72771.c: New.

Added:
    trunk/gcc/testsuite/gcc.c-torture/compile/pr72771.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/reload.c
    trunk/gcc/testsuite/ChangeLog