+ /* Make sure the code is a multiple of 8 bytes long; this is
+ * required to ensure that the dual pipe instruction alignment
+ * is correct. It's also important for the SPU unpacking,
+ * which assumes 8-byte boundaries.
+ */
+ unsigned int front_code_size = spe_code_size(&spe_code_front);
+ while (front_code_size % 8 != 0) {
+ spe_lnop(&spe_code_front);
+ front_code_size = spe_code_size(&spe_code_front);
+ }
+ unsigned int back_code_size = spe_code_size(&spe_code_back);
+ while (back_code_size % 8 != 0) {
+ spe_lnop(&spe_code_back);
+ back_code_size = spe_code_size(&spe_code_back);
+ }
+
+ /* Determine whether the code we generated is facing-dependent, by
+ * determining whether the generated code is different for the front-
+ * and back-facing fragments.
+ */
+ if (front_code_size == back_code_size && memcmp(spe_code_front.store, spe_code_back.store, front_code_size) == 0) {
+ /* Code is identical; only need one copy. */
+ facing_dependent = 0;
+ total_code_size = front_code_size;
+ }
+ else {
+ /* Code is different for front-facing and back-facing fragments.
+ * Need to send both copies.
+ */
+ facing_dependent = 1;
+ total_code_size = front_code_size + back_code_size;
+ }