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authorKorey Sewell <ksewell@umich.edu>2011-02-18 14:29:02 -0500
committerKorey Sewell <ksewell@umich.edu>2011-02-18 14:29:02 -0500
commit72b5233112a41cb879ca63866f9f0ecf8638dbfb (patch)
tree088819d58becadf24d185f560242abca83c50090 /src/cpu/inorder
parentd5961b2b20b498db28c0598f4344f5cb31be850f (diff)
downloadgem5-72b5233112a41cb879ca63866f9f0ecf8638dbfb.tar.xz
inorder: remove events for zero-cycle resources
if a resource has a zero cycle latency (e.g. RegFile write), then dont allocate an event for it to use
Diffstat (limited to 'src/cpu/inorder')
-rw-r--r--src/cpu/inorder/resource.cc20
-rw-r--r--src/cpu/inorder/resources/use_def.cc6
2 files changed, 21 insertions, 5 deletions
diff --git a/src/cpu/inorder/resource.cc b/src/cpu/inorder/resource.cc
index 076084d16..c371f8244 100644
--- a/src/cpu/inorder/resource.cc
+++ b/src/cpu/inorder/resource.cc
@@ -49,7 +49,10 @@ Resource::Resource(string res_name, int res_id, int res_width,
Resource::~Resource()
{
- delete [] resourceEvent;
+ if (resourceEvent) {
+ delete [] resourceEvent;
+ }
+
delete deniedReq;
}
@@ -57,8 +60,14 @@ Resource::~Resource()
void
Resource::init()
{
- // Set Up Resource Events to Appropriate Resource BandWidth
- resourceEvent = new ResourceEvent[width];
+ // If the resource has a zero-cycle (no latency)
+ // function, then no reason to have events
+ // that will process them for the right tick
+ if (latency > 0) {
+ resourceEvent = new ResourceEvent[width];
+ } else {
+ resourceEvent = NULL;
+ }
for (int i = 0; i < width; i++) {
reqs[i] = new ResourceRequest(this);
@@ -73,7 +82,10 @@ Resource::initSlots()
// Add available slot numbers for resource
for (int slot_idx = 0; slot_idx < width; slot_idx++) {
availSlots.push_back(slot_idx);
- resourceEvent[slot_idx].init(this, slot_idx);
+
+ if (resourceEvent) {
+ resourceEvent[slot_idx].init(this, slot_idx);
+ }
}
}
diff --git a/src/cpu/inorder/resources/use_def.cc b/src/cpu/inorder/resources/use_def.cc
index 85bf14500..19246a30b 100644
--- a/src/cpu/inorder/resources/use_def.cc
+++ b/src/cpu/inorder/resources/use_def.cc
@@ -92,7 +92,11 @@ void
UseDefUnit::init()
{
// Set Up Resource Events to Appropriate Resource BandWidth
- resourceEvent = new ResourceEvent[width];
+ if (latency > 0) {
+ resourceEvent = new ResourceEvent[width];
+ } else {
+ resourceEvent = NULL;
+ }
for (int i = 0; i < width; i++) {
reqs[i] = new UseDefRequest(this);