Jairo Balart has uploaded this change for review. (
https://gem5-review.googlesource.com/c/public/gem5/+/15320
Change subject: config: add command line flags to list and select available
indirect branch predictors
......................................................................
config: add command line flags to list and select available indirect branch
predictors
Change-Id: I9a855d36de7d95b7785ff8a897899037cea6a3d8
---
M configs/common/BPConfig.py
M configs/common/Options.py
M configs/common/Simulation.py
M configs/example/fs.py
M configs/example/se.py
5 files changed, 77 insertions(+), 2 deletions(-)
diff --git a/configs/common/BPConfig.py b/configs/common/BPConfig.py
index 5e5b92f..12222f9 100644
--- a/configs/common/BPConfig.py
+++ b/configs/common/BPConfig.py
@@ -85,3 +85,54 @@
for name, cls in inspect.getmembers(m5.objects, is_bp_class):
_bp_classes[name] = cls
+
+# The same for indirect branch predictors...
+# Dictionary of mapping names of real branch predictor models to classes.
+_indirect_bp_classes = {}
+
+
+def is_indirect_bp_class(cls):
+ """Determine if a class is an indirect branch predictor that can be
+ instantiated"""
+
+ # We can't use the normal inspect.isclass because the ParamFactory
+ # and ProxyFactory classes have a tendency to confuse it.
+ try:
+ return issubclass(cls, m5.objects.IndirectPredictorBase) and \
+ not cls.abstract
+ except (TypeError, AttributeError):
+ return False
+
+def get_indirect(name):
+ """Get an Indirect BP class from a user provided class name or
alias."""
+
+ try:
+ indirect_bp_class = _indirect_bp_classes[name]
+ return indirect_bp_class
+ except KeyError:
+ print("%s is not a valid indirect BP model." % (name,))
+ sys.exit(1)
+
+def print_indirect_bp_list():
+ """Print a list of available indirect BP classes."""
+
+ print("Available Indirect BranchPredictor classes:")
+ doc_wrapper = TextWrapper(initial_indent="\t\t",
subsequent_indent="\t\t")
+ for name, cls in _indirect_bp_classes.items():
+ print("\t%s" % name)
+
+ # Try to extract the class documentation from the class help
+ # string.
+ doc = inspect.getdoc(cls)
+ if doc:
+ for line in doc_wrapper.wrap(doc):
+ print(line)
+
+def indirect_bp_names():
+ """Return a list of valid Indirect Branch Predictor names."""
+ return _indirect_bp_classes.keys()
+
+# Add all indirect BPs in the object hierarchy.
+for name, cls in inspect.getmembers(m5.objects, is_indirect_bp_class):
+ _indirect_bp_classes[name] = cls
+
diff --git a/configs/common/Options.py b/configs/common/Options.py
index 536da44..d27b549 100644
--- a/configs/common/Options.py
+++ b/configs/common/Options.py
@@ -56,6 +56,10 @@
BPConfig.print_bp_list()
sys.exit(0)
+def _listIndirectBPTypes(option, opt, value, parser):
+ BPConfig.print_indirect_bp_list()
+ sys.exit(0)
+
def _listMemTypes(option, opt, value, parser):
MemConfig.print_mem_list()
sys.exit(0)
@@ -154,12 +158,18 @@
parser.add_option("--list-bp-types",
action="callback", callback=_listBPTypes,
help="List available branch predictor types")
+ parser.add_option("--list-indirect-bp-types",
+ action="callback", callback=_listIndirectBPTypes,
+ help="List available indirect branch predictor
types")
parser.add_option("--bp-type", type="choice", default=None,
choices=BPConfig.bp_names(),
- help = """
- type of branch predictor to run with
+ help = """type of branch predictor to run with
(if not set, use the default branch predictor of
the selected CPU)""")
+ parser.add_option("--indirect-bp-type", type="choice",
+ default="IndirectPredictor",
+ choices=BPConfig.indirect_bp_names(),
+ help = "type of indirect branch predictor to run
with")
parser.add_option("--checker", action="store_true");
parser.add_option("--cpu-clock", action="store", type="string",
default='2GHz',
diff --git a/configs/common/Simulation.py b/configs/common/Simulation.py
index 19bd962..f1093ec 100644
--- a/configs/common/Simulation.py
+++ b/configs/common/Simulation.py
@@ -482,6 +482,11 @@
if options.bp_type:
bpClass = BPConfig.get(options.bp_type)
switch_cpus[i].branchPred = bpClass()
+ if options.indirect_bp_type:
+ IndirectBPClass = \
+ BPConfig.get_indirect(options.indirect_bp_type)
+ switch_cpus[i].branchPred.branchPred.indirectBranchPred = \
+ IndirectBPClass()
# If elastic tracing is enabled attach the elastic trace probe
# to the switch CPUs
diff --git a/configs/example/fs.py b/configs/example/fs.py
index 3fdf151..83bd7e9 100644
--- a/configs/example/fs.py
+++ b/configs/example/fs.py
@@ -203,6 +203,11 @@
if options.bp_type:
bpClass = BPConfig.get(options.bp_type)
test_sys.cpu[i].branchPred = bpClass()
+ if options.indirect_bp_type:
+ IndirectBPClass = \
+ BPConfig.get_indirect(options.indirect_bp_type)
+ test_sys.cpu[i].branchPred.indirectBranchPred = \
+ IndirectBPClass()
test_sys.cpu[i].createThreads()
# If elastic tracing is enabled when not restoring from checkpoint
and
diff --git a/configs/example/se.py b/configs/example/se.py
index 8403066..925a9be 100644
--- a/configs/example/se.py
+++ b/configs/example/se.py
@@ -238,6 +238,10 @@
bpClass = BPConfig.get(options.bp_type)
system.cpu[i].branchPred = bpClass()
+ if options.indirect_bp_type:
+ indirectBPClass = BPConfig.get_indirect(options.indirect_bp_type)
+ system.cpu[i].branchPred.indirectBranchPred = indirectBPClass()
+
system.cpu[i].createThreads()
if options.ruby:
--
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Gerrit-Project: public/gem5
Gerrit-Branch: master
Gerrit-Change-Id: I9a855d36de7d95b7785ff8a897899037cea6a3d8
Gerrit-Change-Number: 15320
Gerrit-PatchSet: 1
Gerrit-Owner: Jairo Balart <jairo.bal...@metempsy.com>
Gerrit-MessageType: newchange
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