Intel Itanium 9150M, Manual

Page: 46 / 420

Volume 3: Instruction Reference 3:37
clrrrb
clrrrb — Clear RRB
Format: clrrrb all_form B8
clrrrb.pr pred_form B8
Description:
In the all_form, the register rename base registers (CFM.rrb.gr, CFM.rrb.fr, and
CFM.rrb.pr) are cleared. In the pred_form, the single register rename base register for
the predicates (CFM.rrb.pr) is cleared.
This instruction must be the last instruction in an instruction group; otherwise,
operation is undefined.
This instruction cannot be predicated.
Operation: if (!followed_by_stop())
undefined_behavior();
if (all_form) {
CFM.rrb.gr = 0;
CFM.rrb.fr = 0;
CFM.rrb.pr = 0;
} else { // pred_form
CFM.rrb.pr = 0;
}
Interruptions:
None