Clock: Add a Cycles wrapper class and use where applicable

This patch addresses the comments and feedback on the preceding patch
that reworks the clocks and now more clearly shows where cycles
(relative cycle counts) are used to express time.

Instead of bumping the existing patch I chose to make this a separate
patch, merely to try and focus the discussion around a smaller set of
changes. The two patches will be pushed together though.

This changes done as part of this patch are mostly following directly
from the introduction of the wrapper class, and change enough code to
make things compile and run again. There are definitely more places
where int/uint/Tick is still used to represent cycles, and it will
take some time to chase them all down. Similarly, a lot of parameters
should be changed from Param.Tick and Param.Unsigned to
Param.Cycles.

In addition, the use of curTick is questionable as there should not be
an absolute cycle. Potential solutions can be built on top of this
patch. There is a similar situation in the o3 CPU where
lastRunningCycle is currently counting in Cycles, and is still an
absolute time. More discussion to be had in other words.

An additional change that would be appropriate in the future is to
perform a similar wrapping of Tick and probably also introduce a
Ticks class along with suitable operators for all these classes.

1 files changed, 6 insertions, 6 deletions

diff --git a/src/cpu/inorder/resources/mult_div_unit.hh b/src/cpu/inorder/resources/mult_div_unit.hh
index 7d179bdce..d855dbb9d 100644
--- a/src/cpu/inorder/resources/mult_div_unit.hh
+++ b/src/cpu/inorder/resources/mult_div_unit.hh
@@ -56,7 +56,7 @@ class MultDivUnit : public Resource {
 
   public:
     MultDivUnit(std::string res_name, int res_id, int res_width,
-                int res_latency, InOrderCPU *_cpu,
+                Cycles res_latency, InOrderCPU *_cpu,
                 ThePipeline::Params *params);
 
   public:
@@ -86,23 +86,23 @@ class MultDivUnit : public Resource {
   protected:
     /** Latency & Repeat Rate for Multiply Insts */
     unsigned multRepeatRate;
-    unsigned multLatency;
+    Cycles multLatency;
 
     /** Latency & Repeat Rate for 8-bit Divide Insts */
     unsigned div8RepeatRate;
-    unsigned div8Latency;
+    Cycles div8Latency;
 
     /** Latency & Repeat Rate for 16-bit Divide Insts */
     unsigned div16RepeatRate;
-    unsigned div16Latency;
+    Cycles div16Latency;
 
     /** Latency & Repeat Rate for 24-bit Divide Insts */
     unsigned div24RepeatRate;
-    unsigned div24Latency;
+    Cycles div24Latency;
 
     /** Latency & Repeat Rate for 32-bit Divide Insts */
     unsigned div32RepeatRate;
-    unsigned div32Latency;
+    Cycles div32Latency;
 
     /** Last cycle that MDU was used */
     Tick lastMDUCycle;