re PR rtl-optimization/43438 (possible wrong code bug)

2010-03-20  Richard Guenther  <rguenther@suse.de>

	PR rtl-optimization/43438
	* combine.c (make_extraction): Properly zero-/sign-extend an
	extraction of the low part of a CONST_INT.  Also handle
	CONST_DOUBLE.

	* gcc.c-torture/execute/pr43438.c: New testcase.

From-SVN: r157592