target/ppc: Use clmul_64

Use generic routine for 64-bit carry-less multiply.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

target/ppc/int_helper.c

@@ -1455,20 +1455,9 @@ void helper_vpmsumw(ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b)
 
 void helper_VPMSUMD(ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b)
 {
-    int i, j;
-    Int128 tmp, prod[2] = {int128_zero(), int128_zero()};
-
-    for (j = 0; j < 64; j++) {
-        for (i = 0; i < ARRAY_SIZE(r->u64); i++) {
-            if (a->VsrD(i) & (1ull << j)) {
-                tmp = int128_make64(b->VsrD(i));
-                tmp = int128_lshift(tmp, j);
-                prod[i] = int128_xor(prod[i], tmp);
-            }
-        }
-    }
-
-    r->s128 = int128_xor(prod[0], prod[1]);
+    Int128 e = clmul_64(a->u64[0], b->u64[0]);
+    Int128 o = clmul_64(a->u64[1], b->u64[1]);
+    r->s128 = int128_xor(e, o);
 }
 
 #if HOST_BIG_ENDIAN