cpu: Physical register structural + flat indexing

Mimic the changes done on the architectural register indexes on the
physical register indexes. This is specific to the O3 model. The
structure, called PhysRegId, contains a register class, a register
index and a flat register index. The flat register index is kept
because it is useful in some cases where the type of register is not
important (dependency graph and scoreboard for example). Instead
of directly using the structure, most of the code is working with
a const PhysRegId* (typedef to PhysRegIdPtr). The actual PhysRegId
objects are stored in the regFile.

Change-Id: Ic879a3cc608aa2f34e2168280faac1846de77667
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/2701
Reviewed-by: Anthony Gutierrez <anthony.gutierrez@amd.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>

1 files changed, 2 insertions, 5 deletions

diff --git a/src/cpu/o3/scoreboard.cc b/src/cpu/o3/scoreboard.cc
index 2b2b091af..e15f9c769 100644
--- a/src/cpu/o3/scoreboard.cc
+++ b/src/cpu/o3/scoreboard.cc
@@ -36,12 +36,9 @@
 #include "debug/Scoreboard.hh"
 
 Scoreboard::Scoreboard(const std::string &_my_name,
-                       unsigned _numPhysicalRegs, unsigned _numMiscRegs,
-                       PhysRegIndex _zeroRegIdx, PhysRegIndex _fpZeroRegIdx)
+                       unsigned _numPhysicalRegs)
     : _name(_my_name),
       regScoreBoard(_numPhysicalRegs, true),
-      numPhysRegs(_numPhysicalRegs),
-      numTotalRegs(_numPhysicalRegs + _numMiscRegs),
-      zeroRegIdx(_zeroRegIdx), fpZeroRegIdx(_fpZeroRegIdx)
+      numPhysRegs(_numPhysicalRegs)
 {
 }