Disable double precision vectorizer for Atom.

Disable double precision vectorizer for Atom.

gcc/

2010-09-13  H.J. Lu  <hongjiu.lu@intel.com>

	* config/i386/i386-protos.h (ix86_units_per_simd_word): New.

	* config/i386/i386.c (initial_ix86_tune_features): Add
	X86_TUNE_VECTORIZE_DOUBLE.
	(ix86_units_per_simd_word): New.

	* config/i386/i386.h (ix86_tune_indices): Add
	X86_TUNE_VECTORIZE_DOUBLE.
	(TARGET_VECTORIZE_DOUBLE): New.
	(UNITS_PER_SIMD_WORD): Defined with ix86_units_per_simd_word.

gcc/testsuite/

2010-09-13  H.J. Lu  <hongjiu.lu@intel.com>

	* gcc.target/i386/fma4-256-vector.c: Add -mtune=generic.
	* gcc.target/i386/fma4-vector.c: Likewise.
	* gcc.target/i386/vectorize2.c: Likewise.
	* gcc.target/i386/vectorize4.c: Likewise.
	* gcc.target/i386/vectorize5.c: Likewise.
	* gcc.target/i386/vectorize6.c: Likewise.
	* gcc.target/i386/vectorize8.c: Likewise.

	* gcc.target/i386/vect-double-1.c: New.
	* gcc.target/i386/vect-double-1a.c: Likewise.
	* gcc.target/i386/vect-double-2.c: Likewise.
	* gcc.target/i386/vect-double-2a.c: Likewise.

	* lib/target-supports.exp (check_effective_target_vect_double):
	Set et_vect_double_saved to 0 when tuning for Atom.

From-SVN: r164255