From 80e1b49ff823190d0316623d414a343575c93eae Mon Sep 17 00:00:00 2001
From: Tor Aamodt <aamodt@ece.ubc.ca>
Date: Sun, 29 Aug 2010 14:55:25 -0800
Subject: - integrate changes from fermi-test (CL's under that path in range
 7261-7418). (add scoreboard logic from ptxplus branch and modified operand
 collector with parallel ALU/SFU pipelines)

passing regressions

[git-p4: depot-paths = "//depot/gpgpu_sim_research/fermi/distribution/": change = 7419]
---
 src/gpgpu-sim/scoreboard.cc | 129 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 129 insertions(+)
 create mode 100644 src/gpgpu-sim/scoreboard.cc

(limited to 'src/gpgpu-sim/scoreboard.cc')

diff --git a/src/gpgpu-sim/scoreboard.cc b/src/gpgpu-sim/scoreboard.cc
new file mode 100644
index 0000000..4ebcee9
--- /dev/null
+++ b/src/gpgpu-sim/scoreboard.cc
@@ -0,0 +1,129 @@
+/*
+ * scoreboard.cc
+ *
+ *  Created on: Aug 10, 2010
+ *      Author: inder
+ */
+
+#include "scoreboard.h"
+#include "shader.h"
+#include "../cuda-sim/ptx_sim.h"
+
+
+//Constructor
+Scoreboard::Scoreboard( int sid, int n_warps )
+{
+	this->sid = sid;
+	//Initialize size of table
+	reg_table.resize(n_warps);
+}
+
+// Print scoreboard contents
+void Scoreboard::printContents() {
+	printf("scoreboard contents (sid=%d): \n", sid);
+	for(unsigned i=0; i<reg_table.size(); i++) {
+		if(reg_table[i].size() == 0 ) continue;
+		printf("  wid = %d: ", i);
+		std::set<int>::iterator it;
+		for ( it=reg_table[i].begin() ; it != reg_table[i].end(); it++ )
+			printf("%d ", *it);
+		printf("\n");
+	}
+}
+
+
+// Mark register as write-pending
+void Scoreboard::reserveRegister(int wid, int regnum) {
+	//printf("Reserving register sid=%d wid=%d regnum=%d\n", sid, wid, regnum);
+
+	if( !(reg_table[wid].find(regnum) == reg_table[wid].end()) ){
+		printf("Error: trying to reserve an already reserved register (sid=%d, wid=%d, regnum=%d).", sid, wid, regnum);
+		assert(reg_table[wid].find(regnum) == reg_table[wid].end());
+	}
+
+	reg_table[wid].insert(regnum);
+}
+
+
+// Unmark register as write-pending
+void Scoreboard::releaseRegister(int wid, int regnum) {
+	//printf("Releasing register sid=%d wid=%d regnum=%d\n", sid, wid, regnum);
+
+	if( !(reg_table[wid].find(regnum) != reg_table[wid].end()) ) {
+		printf("Error: trying to release an unreserved register (sid=%d, wid=%d, regnum=%d).", sid, wid, regnum);
+		assert(reg_table[wid].find(regnum) != reg_table[wid].end());
+	}
+
+	reg_table[wid].erase(regnum);
+}
+
+
+// Reserve registers for an instruction
+void Scoreboard::reserveRegisters(int wid, void* inst_void) {
+	inst_t *inst = (inst_t *) inst_void;
+
+	// Reserve registers
+	if(inst->out[0] > 0) reserveRegister(wid, inst->out[0]);
+	if(inst->out[1] > 0) reserveRegister(wid, inst->out[1]);
+	if(inst->out[2] > 0) reserveRegister(wid, inst->out[2]);
+	if(inst->out[3] > 0) reserveRegister(wid, inst->out[3]);
+}
+
+// Release registers for an instruction
+void Scoreboard::releaseRegisters(int wid, void *inst_void) {
+	inst_t *inst = (inst_t *) inst_void;
+
+	if(inst->out[0] > 0) releaseRegister(wid, inst->out[0]);
+	if(inst->out[1] > 0) releaseRegister(wid, inst->out[1]);
+	if(inst->out[2] > 0) releaseRegister(wid, inst->out[2]);
+	if(inst->out[3] > 0) releaseRegister(wid, inst->out[3]);
+}
+
+// Checks to see if registers used by an instruction are reserved in the scoreboard
+bool Scoreboard::checkCollision(int wid, void *inst_void) {
+	inst_t *inst = (inst_t *) inst_void;
+
+	// Get list of all input and output registers
+	std::set<int> inst_regs;
+
+	if(inst->out[0] > 0) inst_regs.insert(inst->out[0]);
+	if(inst->out[1] > 0) inst_regs.insert(inst->out[1]);
+	if(inst->out[2] > 0) inst_regs.insert(inst->out[2]);
+	if(inst->out[3] > 0) inst_regs.insert(inst->out[3]);
+	if(inst->in[0] > 0) inst_regs.insert(inst->in[0]);
+	if(inst->in[1] > 0) inst_regs.insert(inst->in[1]);
+	if(inst->in[2] > 0) inst_regs.insert(inst->in[2]);
+	if(inst->in[3] > 0) inst_regs.insert(inst->in[3]);
+	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);
+
+	/*
+	printf("Inst registers: ");
+	std::set<int>::iterator it;
+	for ( it=inst_regs.begin() ; it != inst_regs.end(); it++ )
+		printf("%d ", *it);
+	printf("\n");
+	*/
+
+	// Check for collision, get the intersection of reserved registers and instruction registers
+	//std::set<int> reg_intr;
+	std::set<int>::iterator it2;
+	for ( it2=inst_regs.begin() ; it2 != inst_regs.end(); it2++ )
+		if(reg_table[wid].find(*it2) != reg_table[wid].end()) {
+			//reg_intr.insert(*it2);
+			return true;
+		}
+
+	return false;
+
+	/*
+	printf("Intersection registers: ");
+	std::set<int>::iterator it3;
+	for ( it3=reg_intr.begin() ; it3 != reg_intr.end(); it3++ )
+		printf("%d ", *it3);
+	printf("\n");
+	*/
+
+
+}
-- 
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