expmed.c (expand_smod_pow2): New function to expand signed remainder by a constant power of 2, such as "x % 16".


	* expmed.c (expand_smod_pow2): New function to expand signed
	remainder by a constant power of 2, such as "x % 16".
	(expand_divmod): Call new expand_smod_pow2 when appropriate.
	Minor corrections to comments, e.g. wrapping long lines.

From-SVN: r83815