diff --git a/gcc/config/aarch64/aarch64-simd.md b/gcc/config/aarch64/aarch64-simd.md
index 3fa23b3..79be6be 100644
--- a/gcc/config/aarch64/aarch64-simd.md
+++ b/gcc/config/aarch64/aarch64-simd.md
@@ -2777,6 +2777,62 @@
 
 ;; <su><addsub>w<q>.
 
+(define_expand "widen_ssum<mode>3"
+  [(set (match_operand:<VDBLW> 0 "register_operand" "")
+	(plus:<VDBLW> (sign_extend:<VDBLW> 
+		        (match_operand:VQW 1 "register_operand" ""))
+		      (match_operand:<VDBLW> 2 "register_operand" "")))]
+  "TARGET_SIMD"
+  {
+    rtx p = aarch64_simd_vect_par_cnst_half (<MODE>mode, false);
+    rtx temp = gen_reg_rtx (GET_MODE (operands[0]));
+
+    emit_insn (gen_aarch64_saddw<mode>_internal (temp, operands[2],
+						operands[1], p));
+    emit_insn (gen_aarch64_saddw2<mode> (operands[0], temp, operands[1]));
+    DONE;
+  }
+)
+
+(define_expand "widen_ssum<mode>3"
+  [(set (match_operand:<VWIDE> 0 "register_operand" "")
+	(plus:<VWIDE> (sign_extend:<VWIDE>
+		        (match_operand:VD_BHSI 1 "register_operand" ""))
+		      (match_operand:<VWIDE> 2 "register_operand" "")))]
+  "TARGET_SIMD"
+{
+  emit_insn (gen_aarch64_saddw<mode> (operands[0], operands[2], operands[1]));
+  DONE;
+})
+
+(define_expand "widen_usum<mode>3"
+  [(set (match_operand:<VDBLW> 0 "register_operand" "")
+	(plus:<VDBLW> (zero_extend:<VDBLW> 
+		        (match_operand:VQW 1 "register_operand" ""))
+		      (match_operand:<VDBLW> 2 "register_operand" "")))]
+  "TARGET_SIMD"
+  {
+    rtx p = aarch64_simd_vect_par_cnst_half (<MODE>mode, false);
+    rtx temp = gen_reg_rtx (GET_MODE (operands[0]));
+
+    emit_insn (gen_aarch64_uaddw<mode>_internal (temp, operands[2],
+						 operands[1], p));
+    emit_insn (gen_aarch64_uaddw2<mode> (operands[0], temp, operands[1]));
+    DONE;
+  }
+)
+
+(define_expand "widen_usum<mode>3"
+  [(set (match_operand:<VWIDE> 0 "register_operand" "")
+	(plus:<VWIDE> (zero_extend:<VWIDE>
+		        (match_operand:VD_BHSI 1 "register_operand" ""))
+		      (match_operand:<VWIDE> 2 "register_operand" "")))]
+  "TARGET_SIMD"
+{
+  emit_insn (gen_aarch64_uaddw<mode> (operands[0], operands[2], operands[1]));
+  DONE;
+})
+
 (define_insn "aarch64_<ANY_EXTEND:su><ADDSUB:optab>w<mode>"
   [(set (match_operand:<VWIDE> 0 "register_operand" "=w")
         (ADDSUB:<VWIDE> (match_operand:<VWIDE> 1 "register_operand" "w")
@@ -2787,6 +2843,18 @@
   [(set_attr "type" "neon_<ADDSUB:optab>_widen")]
 )
 
+(define_insn "aarch64_<ANY_EXTEND:su><ADDSUB:optab>w<mode>_internal"
+  [(set (match_operand:<VWIDE> 0 "register_operand" "=w")
+        (ADDSUB:<VWIDE> (match_operand:<VWIDE> 1 "register_operand" "w")
+			(ANY_EXTEND:<VWIDE>
+			  (vec_select:<VHALF>
+			   (match_operand:VQW 2 "register_operand" "w")
+			   (match_operand:VQW 3 "vect_par_cnst_lo_half" "")))))]
+  "TARGET_SIMD"
+  "<ANY_EXTEND:su><ADDSUB:optab>w\\t%0.<Vwtype>, %1.<Vwtype>, %2.<Vhalftype>"
+  [(set_attr "type" "neon_<ADDSUB:optab>_widen")]
+)
+
 (define_insn "aarch64_<ANY_EXTEND:su><ADDSUB:optab>w2<mode>_internal"
   [(set (match_operand:<VWIDE> 0 "register_operand" "=w")
         (ADDSUB:<VWIDE> (match_operand:<VWIDE> 1 "register_operand" "w")
diff --git a/gcc/config/aarch64/iterators.md b/gcc/config/aarch64/iterators.md
index c2eb7de..02e930b 100644
--- a/gcc/config/aarch64/iterators.md
+++ b/gcc/config/aarch64/iterators.md
@@ -479,6 +479,13 @@
 			 (V4SF "V2SF")  (V4HF "V2HF")
 			 (V8HF "V4HF")  (V2DF  "DF")])
 
+;; Half modes of all vector modes, in lower-case.
+(define_mode_attr Vhalf [(V8QI "v4qi")  (V16QI "v8qi")
+			 (V4HI "v2hi")  (V8HI  "v4hi")
+			 (V2SI "si")    (V4SI  "v2si")
+			 (V2DI "di")    (V2SF  "sf")
+			 (V4SF "v2sf")  (V2DF  "df")])
+
 ;; Double modes of vector modes.
 (define_mode_attr VDBL [(V8QI "V16QI") (V4HI "V8HI")
 			(V4HF "V8HF")
@@ -496,6 +503,11 @@
 			(SI   "v2si")  (DI   "v2di")
 			(DF   "v2df")])
 
+;; Modes with double-width elements.
+(define_mode_attr VDBLW [(V8QI "V4HI") (V16QI "V8HI")
+                  (V4HI "V2SI") (V8HI "V4SI")
+                  (V2SI "DI")   (V4SI "V2DI")])
+
 ;; Narrowed modes for VDN.
 (define_mode_attr VNARROWD [(V4HI "V8QI") (V2SI "V4HI")
 			    (DI   "V2SI")])
diff --git a/gcc/testsuite/gcc.target/aarch64/saddw-1.c b/gcc/testsuite/gcc.target/aarch64/saddw-1.c
new file mode 100644
index 0000000..7500fb8
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/saddw-1.c
@@ -0,0 +1,16 @@
+/* { dg-do compile } */
+/* { dg-options "-O3" } */
+
+int 
+t6(int len, void * dummy, short * __restrict x)
+{
+  len = len & ~31;
+  int result = 0;
+  __asm volatile ("");
+  for (int i = 0; i < len; i++)
+    result += x[i];
+  return result;
+}
+
+/* { dg-final { scan-assembler "saddw" } } */
+/* { dg-final { scan-assembler "saddw2" } } */
diff --git a/gcc/testsuite/gcc.target/aarch64/saddw-2.c b/gcc/testsuite/gcc.target/aarch64/saddw-2.c
new file mode 100644
index 0000000..5d9c8d9
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/saddw-2.c
@@ -0,0 +1,16 @@
+/* { dg-do compile } */
+/* { dg-options "-O3" } */
+
+int 
+t6(int len, void * dummy, int * __restrict x)
+{
+  len = len & ~31;
+  long long result = 0;
+  __asm volatile ("");
+  for (int i = 0; i < len; i++)
+    result += x[i];
+  return result;
+}
+
+/* { dg-final { scan-assembler "saddw" } } */
+/* { dg-final { scan-assembler "saddw2" } } */
diff --git a/gcc/testsuite/gcc.target/aarch64/uaddw-1.c b/gcc/testsuite/gcc.target/aarch64/uaddw-1.c
new file mode 100644
index 0000000..3d55ecf
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/uaddw-1.c
@@ -0,0 +1,16 @@
+/* { dg-do compile } */
+/* { dg-options "-O3" } */
+
+int 
+t6(int len, void * dummy, unsigned short * __restrict x)
+{
+  len = len & ~31;
+  unsigned int result = 0;
+  __asm volatile ("");
+  for (int i = 0; i < len; i++)
+    result += x[i];
+  return result;
+}
+
+/* { dg-final { scan-assembler "uaddw" } } */
+/* { dg-final { scan-assembler "uaddw2" } } */
diff --git a/gcc/testsuite/gcc.target/aarch64/uaddw-2.c b/gcc/testsuite/gcc.target/aarch64/uaddw-2.c
new file mode 100644
index 0000000..fd3b578
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/uaddw-2.c
@@ -0,0 +1,17 @@
+/* { dg-do compile } */
+/* { dg-options "-O3" } */
+
+int 
+t6(int len, void * dummy, unsigned short * __restrict x)
+{
+  len = len & ~31;
+  unsigned int result = 0;
+  __asm volatile ("");
+  for (int i = 0; i < len; i++)
+    result += x[i];
+  return result;
+}
+
+/* { dg-final { scan-assembler "uaddw" } } */
+/* { dg-final { scan-assembler "uaddw2" } } */
+
diff --git a/gcc/testsuite/gcc.target/aarch64/uaddw-3.c b/gcc/testsuite/gcc.target/aarch64/uaddw-3.c
new file mode 100644
index 0000000..499af51
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/uaddw-3.c
@@ -0,0 +1,16 @@
+/* { dg-do compile } */
+/* { dg-options "-O3" } */
+
+int 
+t6(int len, void * dummy, char * __restrict x)
+{
+  len = len & ~31;
+  unsigned short result = 0;
+  __asm volatile ("");
+  for (int i = 0; i < len; i++)
+    result += x[i];
+  return result;
+}
+
+/* { dg-final { scan-assembler "uaddw" } } */
+/* { dg-final { scan-assembler "uaddw2" } } */
diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp
index 3eb46f2..254c4e3 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -4163,6 +4163,7 @@ proc check_effective_target_vect_widen_sum_hi_to_si_pattern { } {
     } else {
         set et_vect_widen_sum_hi_to_si_pattern_saved 0
         if { [istarget powerpc*-*-*]
+             || [istarget aarch64*-*-*]
              || [istarget ia64-*-*] } {
             set et_vect_widen_sum_hi_to_si_pattern_saved 1
         }
-- 
1.9.1