From 9494e7d16a18802b756fdc0e814837d5c98bbd86 Mon Sep 17 00:00:00 2001
From: Gabe Black <gabeblack@google.com>
Date: Wed, 18 Oct 2017 20:50:57 -0700
Subject: mem: Use the caching built into AddrRangeMap in the xbar

Use that instead of caching built into the crossbar.

Change-Id: If5a5355a0a1a6e532b14efc88a319de4c023f8c1
Reviewed-on: https://gem5-review.googlesource.com/5243
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Nikos Nikoleris <nikos.nikoleris@arm.com>
---
 src/mem/xbar.hh | 49 +------------------------------------------------
 1 file changed, 1 insertion(+), 48 deletions(-)

(limited to 'src/mem/xbar.hh')

diff --git a/src/mem/xbar.hh b/src/mem/xbar.hh
index f826e142a..2b7e7ed48 100644
--- a/src/mem/xbar.hh
+++ b/src/mem/xbar.hh
@@ -319,7 +319,7 @@ class BaseXBar : public MemObject
     /** the width of the xbar in bytes */
     const uint32_t width;
 
-    AddrRangeMap<PortID> portMap;
+    AddrRangeMap<PortID, 3> portMap;
 
     /**
      * Remember where request packets came from so that we can route
@@ -350,53 +350,6 @@ class BaseXBar : public MemObject
      */
     PortID findPort(Addr addr);
 
-    // Cache for the findPort function storing recently used ports from portMap
-    struct PortCache {
-        bool valid;
-        PortID id;
-        AddrRange range;
-    };
-
-    PortCache portCache[3];
-
-    // Checks the cache and returns the id of the port that has the requested
-    // address within its range
-    inline PortID checkPortCache(Addr addr) const {
-        if (portCache[0].valid && portCache[0].range.contains(addr)) {
-            return portCache[0].id;
-        }
-        if (portCache[1].valid && portCache[1].range.contains(addr)) {
-            return portCache[1].id;
-        }
-        if (portCache[2].valid && portCache[2].range.contains(addr)) {
-            return portCache[2].id;
-        }
-
-        return InvalidPortID;
-    }
-
-    // Clears the earliest entry of the cache and inserts a new port entry
-    inline void updatePortCache(short id, const AddrRange& range) {
-        portCache[2].valid = portCache[1].valid;
-        portCache[2].id    = portCache[1].id;
-        portCache[2].range = portCache[1].range;
-
-        portCache[1].valid = portCache[0].valid;
-        portCache[1].id    = portCache[0].id;
-        portCache[1].range = portCache[0].range;
-
-        portCache[0].valid = true;
-        portCache[0].id    = id;
-        portCache[0].range = range;
-    }
-
-    // Clears the cache. Needs to be called in constructor.
-    inline void clearPortCache() {
-        portCache[2].valid = false;
-        portCache[1].valid = false;
-        portCache[0].valid = false;
-    }
-
     /**
      * Return the address ranges the crossbar is responsible for.
      *
-- 
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