commit 7341f14f147337810325b19bac20db095b162911
author Tuan Ta <qtt2@cornell.edu> Mon Feb 12 23:19:50 2018 -0500
committer Tuan Ta <qtt2@cornell.edu> Thu Jun 14 22:41:30 2018 +0000
tree f8c5e2795048a110d216b4ad7108456bdaead5f8
parent 78fb2c1a5d5e422bf14f134d677a83e3022238f1

cpu: add a new instruction type 'Atomic'

This patch adds a new flag named 'Atomic' to support ISA implementations
that use AtomicOpFunctor to handle atomic instructions instead of a
pair of locking load and unlocking store.

Change-Id: I1fbee6e54432396cb49dfc59ad9006b75812d115
Reviewed-on: https://gem5-review.googlesource.com/8187
Reviewed-by: Anthony Gutierrez <anthony.gutierrez@amd.com>
Maintainer: Anthony Gutierrez <anthony.gutierrez@amd.com>

src/cpu/StaticInstFlags.py

diff --git a/src/cpu/StaticInstFlags.py b/src/cpu/StaticInstFlags.py
index 55ef456..170ca6d 100644
--- a/src/cpu/StaticInstFlags.py
+++ b/src/cpu/StaticInstFlags.py
@@ -64,6 +64,7 @@
         'IsMemRef',         # References memory (load, store, or prefetch)
         'IsLoad',           # Reads from memory (load or prefetch).
         'IsStore',          # Writes to memory.
+        'IsAtomic',         # Does atomic RMW to memory.
         'IsStoreConditional',   # Store conditional instruction.
         'IsIndexed',        # Accesses memory with an indexed address
                             # computation

src/cpu/base_dyn_inst.hh

diff --git a/src/cpu/base_dyn_inst.hh b/src/cpu/base_dyn_inst.hh
index 2c08a3c..93cafd6 100644
--- a/src/cpu/base_dyn_inst.hh
+++ b/src/cpu/base_dyn_inst.hh
@@ -505,6 +505,7 @@
     bool isMemRef()       const { return staticInst->isMemRef(); }
     bool isLoad()         const { return staticInst->isLoad(); }
     bool isStore()        const { return staticInst->isStore(); }
+    bool isAtomic()       const { return staticInst->isAtomic(); }
     bool isStoreConditional() const
     { return staticInst->isStoreConditional(); }
     bool isInstPrefetch() const { return staticInst->isInstPrefetch(); }

src/cpu/static_inst.hh

diff --git a/src/cpu/static_inst.hh b/src/cpu/static_inst.hh
index 84b3525..16b5ffd 100644
--- a/src/cpu/static_inst.hh
+++ b/src/cpu/static_inst.hh
@@ -144,6 +144,7 @@
     bool isMemRef()       const { return flags[IsMemRef]; }
     bool isLoad()         const { return flags[IsLoad]; }
     bool isStore()        const { return flags[IsStore]; }
+    bool isAtomic()       const { return flags[IsAtomic]; }
     bool isStoreConditional()     const { return flags[IsStoreConditional]; }
     bool isInstPrefetch() const { return flags[IsInstPrefetch]; }
     bool isDataPrefetch() const { return flags[IsDataPrefetch]; }