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[llvm-exegesis] Optionally ignore instructions without a sched class. 

Summary: See PR37602.

Reviewers: RKSimon

Subscribers: llvm-commits, tschuett

Differential Revision: https://reviews.llvm.org/D48267

llvm-svn: 334932
This commit is contained in:
Clement Courbet 2018-06-18 11:27:47 +00:00
parent d521c4353e
commit e752fd65e8
2 changed files with 20 additions and 2 deletions
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4
llvm/docs/CommandGuide/llvm-exegesis.rst
View File

@ -174,6 +174,10 @@ OPTIONS
Specify the numPoints parameters to be used for DBSCAN clustering
(`analysis` mode).
.. option:: -ignore-invalid-sched-class=false
If set, ignore instructions that do not have a sched class (class idx = 0).
EXIT STATUS
-----------

18
llvm/tools/llvm-exegesis/llvm-exegesis.cpp
View File

@ -60,6 +60,11 @@ static llvm::cl::opt<unsigned>
llvm::cl::desc("number of time to repeat the asm snippet"),
llvm::cl::init(10000));
static llvm::cl::opt<bool> IgnoreInvalidSchedClass(
"ignore-invalid-sched-class",
llvm::cl::desc("ignore instructions that do not define a sched class"),
llvm::cl::init(false));
static llvm::cl::opt<unsigned> AnalysisNumPoints(
"analysis-numpoints",
llvm::cl::desc("minimum number of points in an analysis cluster"),
@ -120,6 +125,15 @@ void benchmarkMain() {
X86Filter Filter;
const LLVMState State;
const auto Opcode = GetOpcodeOrDie(State.getInstrInfo());
// Ignore instructions without a sched class if -ignore-invalid-sched-class is
// passed.
if (IgnoreInvalidSchedClass &&
State.getInstrInfo().get(Opcode).getSchedClass() == 0) {
llvm::errs() << "ignoring instruction without sched class\n";
return;
}
// FIXME: Do not require SchedModel for latency.
if (!State.getSubtargetInfo().getSchedModel().hasExtraProcessorInfo())
@ -145,8 +159,8 @@ void benchmarkMain() {
BenchmarkFile = "-";
const BenchmarkResultContext Context = getBenchmarkResultContext(State);
std::vector<InstructionBenchmark> Results = ExitOnErr(Runner->run(
GetOpcodeOrDie(State.getInstrInfo()), Filter, NumRepetitions));
std::vector<InstructionBenchmark> Results =
ExitOnErr(Runner->run(Opcode, Filter, NumRepetitions));
for (InstructionBenchmark &Result : Results)
ExitOnErr(Result.writeYaml(Context, BenchmarkFile));