re PR rtl-optimization/64688 (internal compiler error: Max. number of generated reload insns per insn is achieved (90))

2015-01-30  Vladimir Makarov  <vmakarov@redhat.com>

	PR target/64688
	* lra-constraints.c (original_subreg_reg_mode): New.
	(simplify_operand_subreg): Try to simplify subreg of const.  Use
	original_subreg_reg_mode for it.
	(swap_operands): Update original_subreg_reg_mode.
	(curr_insn_transform): Set up original_subreg_reg_mode.

2015-01-30  Vladimir Makarov  <vmakarov@redhat.com>

	PR target/64688
	* g++.dg/pr64688-2.C: New.

From-SVN: r220297