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.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@100797 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 8 insertions, 4 deletions

diff --git a/gcc/loop-doloop.c b/gcc/loop-doloop.c
index dd15aab919f..c40777b82c4 100644
--- a/gcc/loop-doloop.c
+++ b/gcc/loop-doloop.c
@@ -203,12 +203,16 @@ doloop_valid_p (struct loop *loop, struct niter_desc *desc)
 	{
 	  /* Different targets have different necessities for low-overhead
 	     looping.  Call the back end for each instruction within the loop
-	     to let it decide whether the insn is valid.  */
-	  if (!targetm.insn_valid_within_doloop (insn))
-	  {
+	     to let it decide whether the insn prohibits a low-overhead loop.
+	     It will then return the cause for it to emit to the dump file.  */
+	  const char * invalid = targetm.invalid_within_doloop (insn);
+	  if (invalid)
+	    {
+	      if (dump_file)
+		fprintf (dump_file, "Doloop: %s\n", invalid);
 	      result = false;
 	      goto cleanup;
-	  }
+	    }
 	}
     }
   result = true;