diff --git a/target-tilegx/helper.h b/target-tilegx/helper.h
index b253722a72..d380d3ba59 100644
--- a/target-tilegx/helper.h
+++ b/target-tilegx/helper.h
@@ -5,6 +5,7 @@ DEF_HELPER_FLAGS_1(pcnt, TCG_CALL_NO_RWG_SE, i64, i64)
 DEF_HELPER_FLAGS_1(revbits, TCG_CALL_NO_RWG_SE, i64, i64)
 DEF_HELPER_FLAGS_3(shufflebytes, TCG_CALL_NO_RWG_SE, i64, i64, i64, i64)
 
+DEF_HELPER_FLAGS_2(v1multu, TCG_CALL_NO_RWG_SE, i64, i64, i64)
 DEF_HELPER_FLAGS_2(v1shl, TCG_CALL_NO_RWG_SE, i64, i64, i64)
 DEF_HELPER_FLAGS_2(v1shru, TCG_CALL_NO_RWG_SE, i64, i64, i64)
 DEF_HELPER_FLAGS_2(v1shrs, TCG_CALL_NO_RWG_SE, i64, i64, i64)
diff --git a/target-tilegx/simd_helper.c b/target-tilegx/simd_helper.c
index 1c59a92216..2cff43c29c 100644
--- a/target-tilegx/simd_helper.c
+++ b/target-tilegx/simd_helper.c
@@ -28,6 +28,19 @@
 #define V2(X)      (((X) & 0xffff) * 0x0001000100010001ull)
 
 
+uint64_t helper_v1multu(uint64_t a, uint64_t b)
+{
+    uint64_t r = 0;
+    int i;
+
+    for (i = 0; i < 64; i += 8) {
+        unsigned ae = extract64(a, i, 8);
+        unsigned be = extract64(b, i, 8);
+        r = deposit64(r, i, 8, ae * be);
+    }
+    return r;
+}
+
 uint64_t helper_v1shl(uint64_t a, uint64_t b)
 {
     uint64_t m;
diff --git a/target-tilegx/translate.c b/target-tilegx/translate.c
index 14ebd07515..6bfb1af2c8 100644
--- a/target-tilegx/translate.c
+++ b/target-tilegx/translate.c
@@ -1155,7 +1155,11 @@ static TileExcp gen_rrr_opcode(DisasContext *dc, unsigned opext,
     case OE_RRR(V1MINU, 0, X1):
     case OE_RRR(V1MNZ, 0, X0):
     case OE_RRR(V1MNZ, 0, X1):
+        return TILEGX_EXCP_OPCODE_UNIMPLEMENTED;
     case OE_RRR(V1MULTU, 0, X0):
+        gen_helper_v1multu(tdest, tsrca, tsrcb);
+        mnemonic = "v1multu";
+        break;
     case OE_RRR(V1MULUS, 0, X0):
     case OE_RRR(V1MULU, 0, X0):
     case OE_RRR(V1MZ, 0, X0):