re PR tree-optimization/77621 (Internal compiler error for mtune=atom + msse2)

re PR tree-optimization/77621 (Internal compiler error for mtune=atom + msse2)

	PR target/77621
	* config/i386/i386.c (ix86_preferred_simd_mode) <case DFmode>:
	Don't return word_mode for !TARGET_VECTORIZE_DOUBLE.
	(ix86_add_stmt_cost): Penalize DFmode vector operations
	for !TARGET_VECTORIZE_DOUBLE.

testsuite/ChangeLog:

	PR target/77621
	* gcc.target/i386/pr77621.c: New test.
	* gcc.target/i386/vect-double-2.c: Update scan-tree-dump-times
	pattern, loop should vectorize with -mtune=atom.

From-SVN: r240277