[PATCH] Fix ICE in vectorization dump (PR tree-optimization/55995)

[Sharad Singhai]

This patch fixes an ICE in vectorization dump when section anchors are present.

Bootstrapped/tested on x86_64 and PPC 64 and found no new failures. OK
for trunk?

Thanks,
Sharad

2013-01-18  Sharad Singhai  <sing...@google.com>

PR tree-optimization/55995
* dumpfile.c (dump_loc): Print location only if available.
* testsuite/gcc.dg/vect/vect.exp: Use "details" flags for dump info.
* tree-vectorizer.c (increase_alignment): Intialize vect_location.

Index: dumpfile.c
===================================================================
--- dumpfile.c (revision 195244)
+++ dumpfile.c (working copy)
@@ -260,14 +260,13 @@ dump_loc (int dump_kind, FILE *dfile, source_locat
   /* Currently vectorization passes print location information.  */
   if (dump_kind)
     {
-      if (loc == UNKNOWN_LOCATION)
+      if (loc != UNKNOWN_LOCATION)
+        fprintf (dfile, "\n%s:%d: note: ", LOCATION_FILE (loc),
+                 LOCATION_LINE (loc));
+      else if (current_function_decl)
         fprintf (dfile, "\n%s:%d: note: ",
                  DECL_SOURCE_FILE (current_function_decl),
                  DECL_SOURCE_LINE (current_function_decl));
-     else
-        fprintf (dfile, "\n%s:%d: note: ",
-                 LOCATION_FILE (loc),
-                 LOCATION_LINE (loc));
     }
 }

Index: testsuite/gcc.dg/vect/vect.exp
===================================================================
--- testsuite/gcc.dg/vect/vect.exp (revision 195244)
+++ testsuite/gcc.dg/vect/vect.exp (working copy)
@@ -156,7 +156,8 @@ dg-runtest [lsort [glob -nocomplain $srcdir/$subdi

 # alignment-sensitive -fsection-anchors tests
 set DEFAULT_VECTCFLAGS $SAVED_DEFAULT_VECTCFLAGS
-lappend DEFAULT_VECTCFLAGS "-fsection-anchors" "-fdump-ipa-increase_alignment"
+lappend DEFAULT_VECTCFLAGS "-fsection-anchors" \
+ "-fdump-ipa-increase_alignment-details"
 dg-runtest [lsort [glob -nocomplain
$srcdir/$subdir/aligned-section-anchors-*.\[cS\]]]  \
  "" $DEFAULT_VECTCFLAGS

Index: tree-vectorizer.c
===================================================================
--- tree-vectorizer.c (revision 195244)
+++ tree-vectorizer.c (working copy)
@@ -225,6 +225,8 @@ increase_alignment (void)
 {
   struct varpool_node *vnode;

+  vect_location = UNKNOWN_LOC;
+
   /* Increase the alignment of all global arrays for vectorization.  */
   FOR_EACH_DEFINED_VARIABLE (vnode)
     {