re PR tree-optimization/18589 (could optimize FP multiplies better)

re PR tree-optimization/18589 (could optimize FP multiplies better)

gcc:

2012-04-12  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	PR tree-optimization/18589
	* tree-ssa-reassoc.c (reassociate_stats): Add two fields.
	(operand_entry): Add count field.
	(add_repeat_to_ops_vec): New function.
	(completely_remove_stmt): Likewise.
	(remove_def_if_absorbed_call): Likewise.
	(remove_visited_stmt_chain): Remove feeding builtin pow/powi calls.
	(acceptable_pow_call): New function.
	(linearize_expr_tree): Look for builtin pow/powi calls and add operand
	entries with repeat counts when found.
	(repeat_factor_d): New struct and associated typedefs.
	(repeat_factor_vec): New static vector variable.
	(compare_repeat_factors): New function.
	(get_reassoc_pow_ssa_name): Likewise.
	(attempt_builtin_powi): Likewise.
	(reassociate_bb): Call attempt_builtin_powi.
	(fini_reassoc): Two new calls to statistics_counter_event.

gcc/testsuite:

2012-04-12  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	PR tree-optimization/18589
	* gcc.dg/tree-ssa/pr18589-1.c: New test.
	* gcc.dg/tree-ssa/pr18589-2.c: Likewise.
	* gcc.dg/tree-ssa/pr18589-3.c: Likewise.
	* gcc.dg/tree-ssa/pr18589-4.c: Likewise.
	* gcc.dg/tree-ssa/pr18589-5.c: Likewise.
	* gcc.dg/tree-ssa/pr18589-6.c: Likewise.
	* gcc.dg/tree-ssa/pr18589-7.c: Likewise.
	* gcc.dg/tree-ssa/pr18589-8.c: Likewise.
	* gcc.dg/tree-ssa/pr18589-9.c: Likewise.
	* gcc.dg/tree-ssa/pr18589-10.c: Likewise.

From-SVN: r186384