diff --git a/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-2.c b/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-2.c
index 25757d2b6713b53a325979b96f89396dbf4675b8..2ebe98887a6072b9e674846af1df38cdc94258dd 100644
--- a/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-2.c
+++ b/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-2.c
@@ -6,5 +6,5 @@
 
 #include "vect-reduc-dot-1.c"
 
-/* { dg-final { scan-tree-dump-not "vect_recog_dot_prod_pattern: detected" "vect" } } */
+/* { dg-final { scan-tree-dump "vect_recog_dot_prod_pattern: detected" "vect" } } */
 
diff --git a/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-3.c b/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-3.c
index b1deb64e186da99ef42cb687d107445c0b800bd8..6a6679d522350ab4c19836f5537119122f0e654e 100644
--- a/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-3.c
+++ b/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-3.c
@@ -6,5 +6,5 @@
 
 #include "vect-reduc-dot-1.c"
 
-/* { dg-final { scan-tree-dump-not "vect_recog_dot_prod_pattern: detected" "vect" } } */
+/* { dg-final { scan-tree-dump "vect_recog_dot_prod_pattern: detected" "vect" } } */
 
diff --git a/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-6.c b/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-6.c
index b690c9f2eb18b34f4b147d779bb3da582e285399..0cd4b823643bd4fadd529b2fe4e1d664aa1159ad 100644
--- a/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-6.c
+++ b/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-6.c
@@ -6,5 +6,5 @@
 
 #include "vect-reduc-dot-1.c"
 
-/* { dg-final { scan-tree-dump-not "vect_recog_dot_prod_pattern: detected" "vect" } } */
+/* { dg-final { scan-tree-dump "vect_recog_dot_prod_pattern: detected" "vect" } } */
 
diff --git a/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-7.c b/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-7.c
index 29e442e8bbf7176cf861518dc171a83d82967764..eefee2e2ca27d749cd3af2238723aeae4e60a429 100644
--- a/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-7.c
+++ b/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-7.c
@@ -6,5 +6,5 @@
 
 #include "vect-reduc-dot-1.c"
 
-/* { dg-final { scan-tree-dump-not "vect_recog_dot_prod_pattern: detected" "vect" } } */
+/* { dg-final { scan-tree-dump "vect_recog_dot_prod_pattern: detected" "vect" } } */
 
diff --git a/gcc/tree-vect-patterns.c b/gcc/tree-vect-patterns.c
index 803de3fc287371fa202610a55b17e2c8934672f3..441d6cd28c4eaded7abd756164890dbcffd2f3b8 100644
--- a/gcc/tree-vect-patterns.c
+++ b/gcc/tree-vect-patterns.c
@@ -946,7 +946,8 @@ vect_recog_dot_prod_pattern (vec_info *vinfo,
      In which
      - DX is double the size of X
      - DY is double the size of Y
-     - DX, DY, DPROD all have the same type
+     - DX, DY, DPROD all have the same type but the sign
+       between DX, DY and DPROD can differ.
      - sum is the same size of DPROD or bigger
      - sum has been recognized as a reduction variable.
 
@@ -988,12 +989,6 @@ vect_recog_dot_prod_pattern (vec_info *vinfo,
 			     false, 2, unprom0, &half_type))
     return NULL;
 
-  /* If there are two widening operations, make sure they agree on
-     the sign of the extension.  */
-  if (TYPE_PRECISION (unprom_mult.type) != TYPE_PRECISION (type)
-      && TYPE_SIGN (unprom_mult.type) != TYPE_SIGN (half_type))
-    return NULL;
-
   vect_pattern_detected ("vect_recog_dot_prod_pattern", last_stmt);
 
   tree half_vectype;