o3: fix tick used for renaming and issue with range selection

Fixes the tick used from rename:
- previously this gathered the tick on leaving rename which was always 1 less
  than the dispatch. This conflated the decode ticks when back pressure built
  in the pipeline.
- now picks up tick on entry.

Added --store_completions flag:
- will additionally display the store completion tail in the viewer.
- this highlights periods when large numbers of stores are outstanding (>16 LSQ
  blocking)

Allows selection by tick range (previously this caused an infinite loop)

1 files changed, 4 insertions, 1 deletions

diff --git a/src/cpu/o3/decode_impl.hh b/src/cpu/o3/decode_impl.hh
index f87ec0bfa..9ab672931 100644
--- a/src/cpu/o3/decode_impl.hh
+++ b/src/cpu/o3/decode_impl.hh
@@ -47,6 +47,7 @@
 #include "cpu/inst_seq.hh"
 #include "debug/Activity.hh"
 #include "debug/Decode.hh"
+#include "debug/O3PipeView.hh"
 #include "params/DerivO3CPU.hh"
 #include "sim/full_system.hh"
 
@@ -714,7 +715,9 @@ DefaultDecode<Impl>::decodeInsts(ThreadID tid)
         --insts_available;
 
 #if TRACING_ON
-        inst->decodeTick = curTick() - inst->fetchTick;
+        if (DTRACE(O3PipeView)) {
+            inst->decodeTick = curTick() - inst->fetchTick;
+        }
 #endif
 
         // Ensure that if it was predicted as a branch, it really is a