tree-vect-analyze.c (vect_object_analysis): Analyze initial condition of access…

tree-vect-analyze.c (vect_object_analysis): Analyze initial condition of access function instead of base.

        * tree-vect-analyze.c (vect_object_analysis): Analyze initial
        condition of access function instead of base.

From-SVN: r96092

gcc/ChangeLog

+2005-03-08  Ira Rosen  <irar@il.ibm.com>
+
+	PR tree-optimization/20122
+	* tree-vect-analyze.c (vect_object_analysis): Analyze initial
+	condition of access function instead of base.
+
 2005-03-07  Jeff Law  <law@redhat.com>
 	    Steven Bosscher  <stevenb@suse.de>
 

gcc/testsuite/ChangeLog

+2005-03-08  Ira Rosen  <irar@il.ibm.com>
+
+	* gcc.dg/vect/pr20122.c: New test.
+
 2005-03-07  Jeff Law  <law@redhat.com>
 
 	* gcc.dg/tree-ssa/20030821-1.c: Verify that the computed goto

gcc/testsuite/gcc.dg/vect/pr20122.c

+/* { dg-require-effective-target vect_int } */
+
+#include <stdarg.h>
+#include "tree-vect.h"
+
+typedef short ashort __attribute__ ((__aligned__(16)));
+ashort Kernshort[24];
+static void VecBug(ashort Kernel[8][24]) __attribute__((noinline));
+static void VecBug(ashort Kernel[8][24]);
+
+/* Doesn't occur of only inner-loop. */
+static void VecBug(ashort Kernel[8][24])
+{
+  int k,i;
+    for (k = 0; k<8; k++)
+        for (i = 0; i<24; i++)
+            Kernshort[i] = Kernel[k][i];
+}
+
+int main (int argc, char **argv)
+{
+    check_vect ();
+
+    ashort Kernel[8][24];
+    int k,i;
+
+    for (k = 0; k<8; k++)
+        for (i = 0; i<24; i++)
+            Kernel[k][i] = 0;
+
+    VecBug(Kernel);
+
+    return 0;
+}
+
+
+/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 2 "vect" } } */
+

gcc/tree-vect-analyze.c

@@ -1654,10 +1654,11 @@ vect_object_analysis (tree memref, tree stmt, bool is_read,
 		fprintf (vect_dump, "not vectorized: ptr is loop invariant.");	
 	      return NULL_TREE;
 	    }
-	  /* Since there exists DR for MEMREF, we are analyzing the base of
-	     handled component, which not necessary has evolution in the 
+	  /* Since there exists DR for MEMREF, we are analyzing the init of 
+	     the access function, which not necessary has evolution in the 
 	     loop.  */
-	  address_to_analyze = TREE_OPERAND (base, 0);
+	  address_to_analyze = initial_condition_in_loop_num (access_fn,
+                                                              loop->num);
 	}
       
       /* 3.3 set data-reference structure for MEMREF.  */