Improve vzeroupper optimization.

Improve vzeroupper optimization.

gcc/

2010-11-24  H.J. Lu  <hongjiu.lu@intel.com>

	PR target/46519
	* config/i386/i386.c (upper_128bits_state): New.
	(block_info_def): Remove upper_128bits_set and done.  Add state,
	referenced, count, processed and rescanned.
	(check_avx256_stores): Updated.
	(move_or_delete_vzeroupper_2): Updated. Handle deleted BB_END.
	Call note_stores only if needed.  Set referenced and count.
	(move_or_delete_vzeroupper_1): Updated.  Set rescan_vzeroupper_p.
	(rescan_move_or_delete_vzeroupper): New.
	(move_or_delete_vzeroupper):  Process and rescan all all basic
	blocks instead of predecessor blocks of all exit points.
	(ix86_option_override_internal): Enable vzeroupper optimization
	only for -fexpensive-optimizations and not optimizing for size.
	(use_avx256_p): Removed.
	(init_cumulative_args): Don't set use_avx256_p.
	(ix86_function_arg): Likewise.
	(ix86_expand_move): Likewise.
	(ix86_expand_vector_move_misalign): Likewise.
	(ix86_local_alignment): Likewise.
	(ix86_minimum_alignment): Likewise.
	(ix86_expand_epilogue): Don't check use_avx256_p when generating
	vzeroupper.
	(ix86_expand_call): Likewise.

	* config/i386/i386.h (machine_function): Remove use_vzeroupper_p
	and use_avx256_p.  Add rescan_vzeroupper_p.

gcc/testsuite/

2010-11-24  H.J. Lu  <hongjiu.lu@intel.com>

	PR target/46519
	* gcc.target/i386/avx-vzeroupper-10.c: Expect no avx_vzeroupper.
	* gcc.target/i386/avx-vzeroupper-11.c: Likewise.

	* gcc.target/i386/avx-vzeroupper-14.c: Replace -O0 with -O2.
	* gcc.target/i386/avx-vzeroupper-15.c: Likewise.
	* gcc.target/i386/avx-vzeroupper-16.c: Likewise.
	* gcc.target/i386/avx-vzeroupper-17.c: Likewise.

	* gcc.target/i386/avx-vzeroupper-20.c: New.
	* gcc.target/i386/avx-vzeroupper-21.c: Likewise.
	* gcc.target/i386/avx-vzeroupper-22.c: Likewise.
	* gcc.target/i386/avx-vzeroupper-23.c: Likewise.
	* gcc.target/i386/avx-vzeroupper-24.c: Likewise.
	* gcc.target/i386/avx-vzeroupper-25.c: Likewise.
	* gcc.target/i386/avx-vzeroupper-26.c: Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@167124 138bc75d-0d04-0410-961f-82ee72b054a4