cpu-o3: if can get data from bypassnetwork, should not participate in…

… arbitration (#246)
OpenXiangShan · Dec 27, 2024 · 92a275b · 92a275b
1 parent 9463f90
commit 92a275b
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Showing 2 changed files with 3 additions and 3 deletions.
diff --git a/src/cpu/o3/issue_queue.cc b/src/cpu/o3/issue_queue.cc
@@ -308,7 +308,7 @@ IssueQue::wakeUpDependents(const DynInstPtr& inst, bool speculative)
         if (dst->isFixedMapping() || dst->getNumPinnedWritesToComplete() != 1) [[unlikely]] {
             continue;
         }
-
+        scheduler->regCache.insert(dst->flatIndex(), {});
         DPRINTF(Schedule, "was %s woken by p%lu [sn:%llu]\n", speculative ? "spec" : "wb", dst->flatIndex(),
                 inst->seqNum);
         for (auto& it : subDepGraph[dst->flatIndex()]) {
@@ -402,6 +402,7 @@ IssueQue::selectInst()
             for (int i = 0; i < inst->numSrcRegs(); i++) {
                 auto src = inst->srcRegIdx(i);
                 PhysRegIdPtr psrc = inst->renamedSrcIdx(i);
+                if (psrc->isFixedMapping()) continue;
                 std::pair<int, int> rfTypePortId;
                 // read port is point to point with srcid
                 if (src.isIntReg() && intRfTypePortId[pi].size() > i) {
@@ -1029,7 +1030,6 @@ Scheduler::writebackWakeup(const DynInstPtr& inst)
             continue;
         }
         scoreboard[dst->flatIndex()] = true;
-        regCache.insert(dst->flatIndex(), {});
     }
     for (auto it : issueQues) {
         it->wakeUpDependents(inst, false);

diff --git a/src/cpu/o3/issue_queue.hh b/src/cpu/o3/issue_queue.hh
@@ -236,7 +236,7 @@ class Scheduler : public SimObject
 
     // regcache only for integer
     boost::compute::detail::lru_cache<int, NullStruct> regCache =
-        boost::compute::detail::lru_cache<int, NullStruct>(24);
+        boost::compute::detail::lru_cache<int, NullStruct>(28);
 
     // used for searching dependency chain
     std::stack<DynInstPtr> dfs;