2005-06-09  Adrian Straetling  <straetling@de.ibm.com>

	* target.h (insn_valid_within_doloop): Rename into
	"invalid_within_doloop".  Change return type to "const char *".
	Update Comment.
	* targhooks.h (default_insn_valid_within_doloop): Rename into
	"default_invalid_within_doloop".
	* targhooks.c (default_insn_valid_within_doloop): Likewise.
	Update Comment.
	* target-def.h (TARGET_INSN_VALID_WITHIN_DOLOOP): Rename target hook
	into "TARGET_INVALID_WITHIN_DOLOOP". Default it to
	"default_invalid_within_doloop".
	* hooks.c (hook_constcharptr_rtx_null): New function.
	(hook_bool_rtx_true): Remove.
	* hooks.h (hook_constcharptr_rtx_null): Declare.
	(hook_bool_rtx_true): Remove.
	* loop-doloop.c (doloop_valid_p): Temporarily store return value of
	"invalid_within_doloop" and print error message if non-null.
	Update Comment.
	* doc/tm.texi: Update documentation.
	* config/s390/s390.c: Adjust to new hook name and new default hook.
	* config/rs6000/rs6000.c: (rs6000_insn_valid_within_doloop): Rename
	into "rs6000_invalid_within_doloop".
	(rs6000_invalid_within_doloop): Change return type to "static const
	char *" and replace return values.  Update Comment.

From-SVN: r100797