llvm-reduce: Add pass to reduce MIR instruction flags

4 files changed, 62 insertions, 1 deletions

diff --git a/llvm/tools/llvm-reduce/CMakeLists.txt b/llvm/tools/llvm-reduce/CMakeLists.txt
index 88229d6..21151d7 100644
--- a/llvm/tools/llvm-reduce/CMakeLists.txt
+++ b/llvm/tools/llvm-reduce/CMakeLists.txt
@@ -39,6 +39,7 @@ add_llvm_tool(llvm-reduce
   deltas/ReduceOperandsSkip.cpp
   deltas/ReduceOperandsToArgs.cpp
   deltas/ReduceInstructionsMIR.cpp
+  deltas/ReduceInstructionFlagsMIR.cpp
   deltas/ReduceIRReferences.cpp
   llvm-reduce.cpp
 
diff --git a/llvm/tools/llvm-reduce/DeltaManager.cpp b/llvm/tools/llvm-reduce/DeltaManager.cpp
index d3e8740..a5b6c17 100644
--- a/llvm/tools/llvm-reduce/DeltaManager.cpp
+++ b/llvm/tools/llvm-reduce/DeltaManager.cpp
@@ -25,6 +25,7 @@
 #include "deltas/ReduceGlobalVarInitializers.h"
 #include "deltas/ReduceGlobalVars.h"
 #include "deltas/ReduceIRReferences.h"
+#include "deltas/ReduceInstructionFlagsMIR.h"
 #include "deltas/ReduceInstructions.h"
 #include "deltas/ReduceInstructionsMIR.h"
 #include "deltas/ReduceMetadata.h"
@@ -72,7 +73,8 @@ static cl::opt<std::string>
   DELTA_PASS("ir-instruction-references",                                      \
              reduceIRInstructionReferencesDeltaPass)                           \
   DELTA_PASS("ir-block-references", reduceIRBlockReferencesDeltaPass)          \
-  DELTA_PASS("ir-function-references", reduceIRFunctionReferencesDeltaPass)
+  DELTA_PASS("ir-function-references", reduceIRFunctionReferencesDeltaPass)    \
+  DELTA_PASS("instruction-flags", reduceInstructionFlagsMIRDeltaPass)
 
 static void runAllDeltaPasses(TestRunner &Tester) {
 #define DELTA_PASS(NAME, FUNC) FUNC(Tester);
diff --git a/llvm/tools/llvm-reduce/deltas/ReduceInstructionFlagsMIR.cpp b/llvm/tools/llvm-reduce/deltas/ReduceInstructionFlagsMIR.cpp
new file mode 100644
index 0000000..4c3b4d39
--- /dev/null
+++ b/llvm/tools/llvm-reduce/deltas/ReduceInstructionFlagsMIR.cpp
@@ -0,0 +1,35 @@
+//===- ReduceInstructionFlagsMIR.cpp - Specialized Delta Pass -------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements a function which calls the Generic Delta pass in order
+// to reduce uninteresting MachineInstr flags from the MachineFunction.
+//
+//===----------------------------------------------------------------------===//
+
+#include "ReduceInstructionFlagsMIR.h"
+#include "llvm/CodeGen/MachineFunction.h"
+using namespace llvm;
+
+static void removeFlagsFromModule(Oracle &O, ReducerWorkItem &WorkItem) {
+  for (const Function &F : WorkItem.getModule()) {
+    if (auto *MF = WorkItem.MMI->getMachineFunction(F)) {
+      for (MachineBasicBlock &MBB : *MF) {
+        for (MachineInstr &MI : MBB) {
+          // TODO: Should this clear flags individually?
+          if (MI.getFlags() != 0 && !O.shouldKeep())
+            MI.setFlags(0);
+        }
+      }
+    }
+  }
+}
+
+void llvm::reduceInstructionFlagsMIRDeltaPass(TestRunner &Test) {
+  outs() << "*** Reducing Instruction flags...\n";
+  runDeltaPass(Test, removeFlagsFromModule);
+}
diff --git a/llvm/tools/llvm-reduce/deltas/ReduceInstructionFlagsMIR.h b/llvm/tools/llvm-reduce/deltas/ReduceInstructionFlagsMIR.h
new file mode 100644
index 0000000..a211994
--- /dev/null
+++ b/llvm/tools/llvm-reduce/deltas/ReduceInstructionFlagsMIR.h
@@ -0,0 +1,23 @@
+//===- ReduceInstructionFlagsMIR.h  - Specialized Delta Pass --------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements a function which calls the Generic Delta pass in order
+// to reduce uninteresting MachineInstr flags from the MachineFunction.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TOOLS_LLVM_REDUCE_DELTAS_REDUCEINSTRUCTIONFLAGSMIR_H
+#define LLVM_TOOLS_LLVM_REDUCE_DELTAS_REDUCEINSTRUCTIONFLAGSMIR_H
+
+#include "Delta.h"
+
+namespace llvm {
+void reduceInstructionFlagsMIRDeltaPass(TestRunner &Test);
+} // namespace llvm
+
+#endif