Repeat processing all basic blocks for vzeroupper optimization.

Repeat processing all basic blocks for vzeroupper optimization.

gcc/

2010-12-30  H.J. Lu  <hongjiu.lu@intel.com>

	PR target/46519
	* config/i386/i386.c (block_info_def): Remove referenced, count
	and rescanned.
	(move_or_delete_vzeroupper_2): Updated.
	(move_or_delete_vzeroupper_1): Rewritten to avoid recursive call.
	(rescan_move_or_delete_vzeroupper): Removed.
	(move_or_delete_vzeroupper): Repeat processing all basic blocks
	until no basic block state is changed to used at exit.

gcc/testsuite/

2010-12-30  H.J. Lu  <hongjiu.lu@intel.com>

	PR target/46519
	* gfortran.dg/pr46519-2.f90: New.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@168342 138bc75d-0d04-0410-961f-82ee72b054a4