cpu: Add an indirect branch target predictor

This patch adds a configurable indirect branch predictor that can be indexed
by a combination of GHR and path history hashes. Implements the functionality
described in:

"Target prediction for indirect jumps" by Chang, Hao, and Patt
http://dl.acm.org/citation.cfm?id=264209

1 files changed, 6 insertions, 0 deletions

diff --git a/src/cpu/pred/tournament.cc b/src/cpu/pred/tournament.cc
index ea6be46fa..2dd48a09c 100644
--- a/src/cpu/pred/tournament.cc
+++ b/src/cpu/pred/tournament.cc
@@ -388,6 +388,12 @@ TournamentBPParams::create()
     return new TournamentBP(this);
 }
 
+unsigned
+TournamentBP::getGHR(void *bp_history) const
+{
+    return static_cast<BPHistory *>(bp_history)->globalHistory;
+}
+
 #ifdef DEBUG
 int
 TournamentBP::BPHistory::newCount = 0;