re PR middle-end/39326 (Segmentation fault with -O1, out of memory with -O2)

re PR middle-end/39326 (Segmentation fault with -O1, out of memory with -O2)

2013-03-21  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/39326
	* tree-ssa-loop-im.c (UNANALYZABLE_MEM_ID): New define.
	(MEM_ANALYZABLE): Adjust.
	(record_mem_ref_loc): Move bitmap ops ...
	(gather_mem_refs_stmt): ... here.  Use the shared mem-ref for
	unanalyzable refs, do not record locations for it.
	(analyze_memory_references): Allocate ref zero as shared
	unanalyzable ref.
	(refs_independent_p): Do not test for unanalyzed mems here.
	(ref_indep_loop_p_1): Special-case disambiguation against
	the unanalyzed ref.
	(ref_indep_loop_p): Assert we are not queried for the
	unanalyzed mem.

From-SVN: r196878