re PR tree-optimization/24689 (operand_equal_p does not return true for some equivale...

re PR tree-optimization/24689 (operand_equal_p does not return true for some equivalent ARRAY_REF)

2007-04-12  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/24689
	PR tree-optimization/31307
	* fold-const.c (operand_equal_p): Compare INTEGER_CST array
	indices by value.
	* gimplify.c (canonicalize_addr_expr): To be consistent with
	gimplify_compound_lval only set operands two and three of
	ARRAY_REFs if they are not gimple_min_invariant.  This makes
	it never at this place.
	* tree-ssa-ccp.c (maybe_fold_offset_to_array_ref): Likewise.

	* g++.dg/tree-ssa/pr31307.C: New testcase.
	* gcc.dg/tree-ssa/pr24689.c: Likewise.

From-SVN: r123736