2011-05-04  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>

	* calls.c (emit_library_call_value_1): Invoke
	promote_function_mode hook on libcall arguments.
	* explow.c (promote_function_mode, promote_mode): Handle TYPE
	argument being NULL.
	* targhooks.c (default_promote_function_mode): Lisewise.
	* config/s390/s390.c (s390_promote_function_mode): Likewise.
	* config/sparc/sparc.c (sparc_promote_function_mode): Likewise.

	* doc/tm.texi: Document that TYPE argument might be NULL.

From-SVN: r173371