Hi,

The attached patch fixes Bugzilla 45847
(http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45847). When compiling
without -mvectorize-with-neon-quad and vectorizing scalar widening
operations that widen words to double words, there are no corresponding
vector types for DI scalar types. For this scenario, a call to
get_vect_type_for_scalar_type() returns NULL and an absent NULL-check
caused this segfault. The attached patch adds this NULL-check. Also,
this is consistent with all the other places where a NULL-check follows
a call to get_vect_type_for_scalar_type() in tree-vect-patterns.c. 

Regression tested with arm-linux-gnueabi. OK?

--
Tejas Belagod
ARM.

gcc/

2010-10-05  Tejas Belagod  <tejas.belagod@arm.com>

	* tree-vect-patterns.c (vect_recog_widen_mult_pattern): Add NULL
	check for vectype_out returned by get_vectype_for_scalar_type().

testsuite/

2010-10-05  Tejas Belagod  <tejas.belagod@arm.com>

	* gcc.dg/vect/pr45847.c: New test.

Index: gcc-4.5/gcc/testsuite/gcc.dg/vect/pr45847.c
===================================================================
--- /dev/null
+++ gcc-4.5/gcc/testsuite/gcc.dg/vect/pr45847.c
@@ -0,0 +1,15 @@
+/* { dg-do compile } */
+
+
+long long foo (long long *__restrict a,  int *__restrict b, int *__restrict c )
+{
+  int i;
+  long long sum=0;
+  for (i=0;i<256;i++)
+   sum += (long long)b[i] * c[i];
+
+  return sum;
+}
+
+/* { dg-final { cleanup-tree-dump "vect" } } */
+
Index: gcc-4.5/gcc/tree-vect-patterns.c
===================================================================
--- gcc-4.5.orig/gcc/tree-vect-patterns.c
+++ gcc-4.5/gcc/tree-vect-patterns.c
@@ -411,6 +411,7 @@ vect_recog_widen_mult_pattern (gimple la
   /* Check target support  */
   vectype = get_vectype_for_scalar_type (half_type0);
   if (!vectype
+      || !get_vectype_for_scalar_type (type);
       || !supportable_widening_operation (WIDEN_MULT_EXPR, last_stmt, vectype,
 					  &dummy, &dummy, &dummy_code,
 					  &dummy_code, &dummy_int, &dummy_vec))