create separate scoreboard for I-Buf's second slot; fix other minor issues

1 files changed, 31 insertions, 0 deletions

diff --git a/src/gpgpu-sim/scoreboard.cc b/src/gpgpu-sim/scoreboard.cc
index 44a9980..de71807 100644
--- a/src/gpgpu-sim/scoreboard.cc
+++ b/src/gpgpu-sim/scoreboard.cc
@@ -38,6 +38,7 @@ Scoreboard::Scoreboard(unsigned sid, unsigned n_warps, class gpgpu_t* gpu)
   // Initialize size of table
   reg_table.resize(n_warps);
   longopregs.resize(n_warps);
+  sec_reg_table.resize(n_warps);
 
   m_gpu = gpu;
 }
@@ -152,3 +153,33 @@ bool Scoreboard::checkCollision(unsigned wid, const class inst_t* inst) const {
 bool Scoreboard::pendingWrites(unsigned wid) const {
   return !reg_table[wid].empty();
 }
+
+// Secondary scoreboard methods for intra-warp co-issue
+
+void Scoreboard::reserveRegisterSecondary(unsigned wid, unsigned regnum) {
+  // No abort on duplicate — secondary may share register names with primary
+  sec_reg_table[wid].insert(regnum);
+}
+
+void Scoreboard::releaseRegisterSecondary(unsigned wid, unsigned regnum) {
+  sec_reg_table[wid].erase(regnum);
+}
+
+bool Scoreboard::checkCollisionSecondary(unsigned wid,
+                                          const inst_t *inst) const {
+  std::set<int> inst_regs;
+  for (unsigned i = 0; i < inst->outcount; i++) inst_regs.insert(inst->out[i]);
+  for (unsigned j = 0; j < inst->incount; j++) inst_regs.insert(inst->in[j]);
+  if (inst->pred > 0) inst_regs.insert(inst->pred);
+  if (inst->ar1 > 0) inst_regs.insert(inst->ar1);
+  if (inst->ar2 > 0) inst_regs.insert(inst->ar2);
+
+  for (auto it = inst_regs.begin(); it != inst_regs.end(); it++)
+    if (sec_reg_table[wid].find(*it) != sec_reg_table[wid].end())
+      return true;
+  return false;
+}
+
+void Scoreboard::clearSecondary(unsigned wid) {
+  sec_reg_table[wid].clear();
+}