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3939e99aae
This is typically the first thing I do when reducing a new testcase until the IR section can be deleted.
83 lines
2.8 KiB
C++
83 lines
2.8 KiB
C++
//===- ReduceIRReferences.cpp - Specialized Delta Pass --------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements a function which calls the Generic Delta pass in order
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// to remove backreferences to the IR from MIR. In particular, this will remove
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// the Value references in MachineMemOperands.
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//
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//===----------------------------------------------------------------------===//
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#include "ReduceIRReferences.h"
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#include "Delta.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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using namespace llvm;
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static void dropIRReferencesFromInstructions(Oracle &O, MachineFunction &MF) {
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for (MachineBasicBlock &MBB : MF) {
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for (MachineInstr &MI : MBB) {
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if (!O.shouldKeep()) {
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for (MachineMemOperand *MMO : MI.memoperands()) {
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// Leave behind pseudo source values.
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// TODO: Removing all MemOperand values is a further reduction step.
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if (MMO->getPointerInfo().V.is<const Value *>())
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MMO->setValue(static_cast<const Value *>(nullptr));
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}
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// TODO: Try to remove GlobalValue references and metadata
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}
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}
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}
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}
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static void stripIRFromInstructions(Oracle &O, ReducerWorkItem &WorkItem) {
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for (const Function &F : WorkItem.getModule()) {
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if (auto *MF = WorkItem.MMI->getMachineFunction(F))
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dropIRReferencesFromInstructions(O, *MF);
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}
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}
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static void stripIRFromBlocks(Oracle &O, ReducerWorkItem &WorkItem) {
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for (const Function &F : WorkItem.getModule()) {
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if (auto *MF = WorkItem.MMI->getMachineFunction(F)) {
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for (MachineBasicBlock &MBB : *MF) {
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if (!O.shouldKeep())
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MBB.clearBasicBlock();
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}
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}
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}
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}
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static void stripIRFromFunctions(Oracle &O, ReducerWorkItem &WorkItem) {
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for (const Function &F : WorkItem.getModule()) {
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if (!O.shouldKeep()) {
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if (auto *MF = WorkItem.MMI->getMachineFunction(F)) {
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MachineFrameInfo &MFI = MF->getFrameInfo();
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for (int I = MFI.getObjectIndexBegin(), E = MFI.getObjectIndexEnd();
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I != E; ++I)
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MFI.clearObjectAllocation(I);
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}
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}
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}
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}
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void llvm::reduceIRInstructionReferencesDeltaPass(TestRunner &Test) {
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outs() << "*** Reducing IR references from instructions...\n";
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runDeltaPass(Test, stripIRFromInstructions);
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}
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void llvm::reduceIRBlockReferencesDeltaPass(TestRunner &Test) {
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outs() << "*** Reducing IR references from blocks...\n";
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runDeltaPass(Test, stripIRFromBlocks);
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}
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void llvm::reduceIRFunctionReferencesDeltaPass(TestRunner &Test) {
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outs() << "*** Reducing IR references from functions...\n";
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runDeltaPass(Test, stripIRFromFunctions);
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}
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