O3 CPU: Provide the squashing instruction

This patch adds a function to the ROB that will get the squashing instruction
from the ROB's list of instructions. This squashing instruction is used for
figuring out the macroop from which the fetch stage should fetch the microops.
Further, a check has been added that if the instructions are to be fetched
from the cache maintained by the fetch stage, then the data in the cache should
be valid and the PC of the thread being fetched from is same as the address of
the cache block.

1 files changed, 11 insertions, 0 deletions

diff --git a/src/cpu/o3/rob_impl.hh b/src/cpu/o3/rob_impl.hh
index 0484f519c..ee4a9e576 100644
--- a/src/cpu/o3/rob_impl.hh
+++ b/src/cpu/o3/rob_impl.hh
@@ -544,3 +544,14 @@ ROB<Impl>::regStats()
         .desc("The number of ROB writes");
 }
 
+template <class Impl>
+typename Impl::DynInstPtr
+ROB<Impl>::findInst(ThreadID tid, InstSeqNum squash_inst)
+{
+    for (InstIt it = instList[tid].begin(); it != instList[tid].end(); it++) {
+        if ((*it)->seqNum == squash_inst) {
+            return *it;
+        }
+    }
+    return NULL;
+}