re PR tree-optimization/49715 (Could do more efficient unsigned-to-float to conversions based on range information)

2011-07-25  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/49715
	* tree-vrp.c: Include expr.h and optabs.h.
	(range_fits_type_): New function.
	(simplify_float_conversion_using_ranges): Likewise.
	(simplify_stmt_using_ranges): Call it.
	* Makefile.in (tree-vrp.o): Add $(EXPR_H) and $(OPTABS_H) dependencies.
	* optabs.c (can_float_p): Export.
	* optabs.h (can_float_p): Declare.

	* gcc.target/i386/pr49715-1.c: New testcase.
	* gcc.target/i386/pr49715-2.c: Likewise.

From-SVN: r176735