2017-10-13  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/82525
	* graphite-isl-ast-to-gimple.c
	(translate_isl_ast_to_gimple::widest_int_from_isl_expr_int): Split
	out from ...
	(translate_isl_ast_to_gimple::gcc_expression_from_isl_expr_int): Here.
	Fail code generation when we cannot represent the isl integer.
	(binary_op_to_tree): Elide modulo operations that are no-ops
	in the type we code generate.  Remove now superfluous code
	generation errors.

	* gcc.dg/graphite/id-30.c: New testcase.
	* gfortran.dg/graphite/id-28.f90: Likewise.

From-SVN: r253706