+ switch (before->inst->op) {
+ case QOP_RCP:
+ case QOP_RSQ:
+ case QOP_EXP2:
+ case QOP_LOG2:
+ for (int i = 0; i < qir_get_nsrc(after->inst); i++) {
+ if (after->inst->src[i].file ==
+ before->inst->dst.file &&
+ after->inst->src[i].index ==
+ before->inst->dst.index) {
+ /* There are two QPU delay slots before we can
+ * read a math result, which could be up to 4
+ * QIR instructions if they packed well.
+ */
+ return 4;
+ }
+ }
+ break;
+ default:
+ break;
+ }
+