2010-05-11 Christian Borntraeger <borntraeger@de.ibm.com>

        * tree-ssa-loop-prefetch.c: Add debug for dropped prefetches.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@159256 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 11 insertions, 2 deletions

diff --git a/gcc/tree-ssa-loop-prefetch.c b/gcc/tree-ssa-loop-prefetch.c
index 74976167f4a..2fc901d907b 100644
--- a/gcc/tree-ssa-loop-prefetch.c
+++ b/gcc/tree-ssa-loop-prefetch.c
@@ -860,11 +860,20 @@ should_issue_prefetch_p (struct mem_ref *ref)
   /* For now do not issue prefetches for only first few of the
      iterations.  */
   if (ref->prefetch_before != PREFETCH_ALL)
-    return false;
+    {
+      if (dump_file && (dump_flags & TDF_DETAILS))
+        fprintf (dump_file, "Ignoring %p due to prefetch_before\n",
+		 (void *) ref);
+      return false;
+    }
 
   /* Do not prefetch nontemporal stores.  */
   if (ref->storent_p)
-    return false;
+    {
+      if (dump_file && (dump_flags & TDF_DETAILS))
+        fprintf (dump_file, "Ignoring nontemporal store %p\n", (void *) ref);
+      return false;
+    }
 
   return true;
 }