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[PATCH] Make vectorizer dumps more comparable


This avoids the file/location clutter in front of each line
in the vectorizer dump.  While this is useful for people
requesting -fvectorizer-verbose=N in dump files this makes
you unable to compare dumps for testcases on a branch and trunk.
It also makes lines excessively long because the testsuite
filename paths are so long.  Very annoying.

(I'd argue also that -fvectorizer-verbose=N dumps to the dump
file if available and not always to stderr is bogus, but well ...)

This patch has made my life a lot easier debugging the data dependence 
stuff.

Bootstrapped and tested on x86_64-unknown-linux-gnu, installed on trunk.

Richard.

2011-08-24  Richard Guenther  <rguenther@suse.de>

	* tree-vectorizer.c (vect_print_dump_info): Avoid the
	file and location clutter when dumping to dump files.

Index: gcc/tree-vectorizer.c
===================================================================
--- gcc/tree-vectorizer.c	(revision 178028)
+++ gcc/tree-vectorizer.c	(working copy)
@@ -149,7 +149,10 @@ vect_print_dump_info (enum vect_verbosit
   if (!current_function_decl || !vect_dump)
     return false;
 
-  if (vect_location == UNKNOWN_LOC)
+  if (dump_file)
+    fprintf (vect_dump, "\n");
+
+  else if (vect_location == UNKNOWN_LOC)
     fprintf (vect_dump, "\n%s:%d: note: ",
 	     DECL_SOURCE_FILE (current_function_decl),
 	     DECL_SOURCE_LINE (current_function_decl));


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