- /* Real Missed entry: Power8 based missed entry */
- if ((addr == 0) && (target == 1) && (pred == 1)) {
- r_index++;
- continue;
- }
-
- /* Reserved condition: Not a valid entry */
- if ((addr == 0) && (target == 1) && (pred == 0)) {
- r_index++;
- continue;
- }
+ /* Branches are read most recent first (ie. mfbhrb 0 is
+ * the most recent branch).
+ * There are two types of valid entries:
+ * 1) a target entry which is the to address of a
+ * computed goto like a blr,bctr,btar. The next
+ * entry read from the bhrb will be branch
+ * corresponding to this target (ie. the actual
+ * blr/bctr/btar instruction).
+ * 2) a from address which is an actual branch. If a
+ * target entry proceeds this, then this is the
+ * matching branch for that target. If this is not
+ * following a target entry, then this is a branch
+ * where the target is given as an immediate field
+ * in the instruction (ie. an i or b form branch).
+ * In this case we need to read the instruction from
+ * memory to determine the target/to address.
+ */