* tree-vect-analyze.c (vect_enhance_data_refs_alignment): Copy

        UNITS_PER_SIMD_WORD to a local variable to avoid a "division by zero"
        error.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@96552 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index b84cbb5..7c520a2 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,4 +1,11 @@
 2005-03-16  Steven Bosscher  <stevenb@suse.de>
+            Dorit Naishlos  <dorit@il.ibm.com>
+
+       * tree-vect-analyze.c (vect_enhance_data_refs_alignment): Copy 
+       UNITS_PER_SIMD_WORD to a local variable to avoid a "division by zero" 
+       error.
+
+2005-03-16  Steven Bosscher  <stevenb@suse.de>
 
        * tree-inline.c (walk_type_fields, walk_tree,
        walk_tree_without_duplicates): Move from here...

diff --git a/gcc/tree-vect-analyze.c b/gcc/tree-vect-analyze.c
index d1b274b..df2e882 100644 (file)
--- a/gcc/tree-vect-analyze.c
+++ b/gcc/tree-vect-analyze.c
@@ -1013,6 +1013,13 @@ vect_enhance_data_refs_alignment (loop_vec_info loop_vinfo)
   struct data_reference *dr0 = NULL;
   unsigned int i, j;
 
+  /* Sigh, a hack to make targets that do not define UNITS_PER_SIMD_WORD
+     bootstrap.  Copy UNITS_PER_SIMD_WORD to a local variable to avoid a
+     "division by zero" error.  This error would be issued because we
+     we do "... % UNITS_PER_SIMD_WORD" below, and UNITS_PER_SIMD_WORD
+     defaults to 0 if it is not defined by the target.  */
+  int units_per_simd_word = UNITS_PER_SIMD_WORD;
+
   /*
      This pass will require a cost model to guide it whether to apply peeling 
      or versioning or a combination of the two. For example, the scheme that
@@ -1167,7 +1174,7 @@ vect_enhance_data_refs_alignment (loop_vec_info loop_vinfo)
                  int drsize = GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (DR_REF (dr))));
 
                  DR_MISALIGNMENT (dr) += npeel * drsize;
-                 DR_MISALIGNMENT (dr) %= UNITS_PER_SIMD_WORD;
+                 DR_MISALIGNMENT (dr) %= units_per_simd_word;
                }
              else
                DR_MISALIGNMENT (dr) = -1;