cpu: Add a memory access predicate

This changeset introduces a new predicate to guard memory accesses.
The most immediate use for this is to allow proper handling of
predicated-false vector contiguous loads and predicated-false
micro-ops of vector gather loads (added in separate changesets).

Change-Id: Ice6894fe150faec2f2f7ab796a00c99ac843810a
Signed-off-by: Giacomo Gabrielli <giacomo.gabrielli@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/17991
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Bradley Wang <radwang@ucdavis.edu>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Maintainer: Nikos Nikoleris <nikos.nikoleris@arm.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/src/cpu/base_dyn_inst.hh b/src/cpu/base_dyn_inst.hh
index f1c782956..4084241bd 100644
--- a/src/cpu/base_dyn_inst.hh
+++ b/src/cpu/base_dyn_inst.hh
@@ -135,6 +135,7 @@ class BaseDynInst : public ExecContext, public RefCounted
         EffAddrValid,
         RecordResult,
         Predicate,
+        MemAccPredicate,
         PredTaken,
         IsStrictlyOrdered,
         ReqMade,
@@ -851,6 +852,18 @@ class BaseDynInst : public ExecContext, public RefCounted
         }
     }
 
+    bool
+    readMemAccPredicate() const
+    {
+        return instFlags[MemAccPredicate];
+    }
+
+    void
+    setMemAccPredicate(bool val)
+    {
+        instFlags[MemAccPredicate] = val;
+    }
+
     /** Sets the ASID. */
     void setASID(short addr_space_id) { asid = addr_space_id; }
     short getASID() { return asid; }