vasilito
cb424d7448
verify-patch-sanity.py validates every active recipe .patch has internally- consistent hunk line counts — catching the 'malformed patch at line N' failure at commit/CI/preflight time instead of hours into a cook. This cycle hit that class three times (qtwaylandscanner, sddm, xwayland), each only discovered when cookbook tried to apply the patch. Running it across the repo found 29 latent malformed patches (validated against GNU patch: e.g. relibc/P3-sysv-ipc reproduces 'malformed patch at line 22'). They were harmless only because they sit in vendored recipes (baked, not re- applied) — but would fail on any version-bump re-derivation. --fix recounts the hunk headers (body untouched) and repaired all 29. Wired into build-preflight.sh (Phase 1.0D) and redbear-ci.yml, with a unit test (test-patch-sanity.sh). Skips archived/legacy trees and unvalidatable formats (empty placeholders, bare-@@ git hunks).
123 lines
3.9 KiB
C++
123 lines
3.9 KiB
C++
//===- DeadMachineInstructionElim.cpp - Remove dead machine instructions --===//
|
|
//
|
|
// 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 is an extremely simple MachineInstr-level dead-code-elimination pass.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/CodeGen/DeadMachineInstructionElim.h"
|
|
#include "llvm/ADT/PostOrderIterator.h"
|
|
#include "llvm/ADT/Statistic.h"
|
|
#include "llvm/CodeGen/LiveRegUnits.h"
|
|
#include "llvm/CodeGen/MachineFunctionPass.h"
|
|
#include "llvm/CodeGen/MachineRegisterInfo.h"
|
|
#include "llvm/CodeGen/TargetSubtargetInfo.h"
|
|
#include "llvm/InitializePasses.h"
|
|
#include "llvm/Pass.h"
|
|
#include "llvm/Support/Debug.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
|
|
using namespace llvm;
|
|
|
|
#define DEBUG_TYPE "dead-mi-elimination"
|
|
|
|
STATISTIC(NumDeletes, "Number of dead instructions deleted");
|
|
|
|
namespace {
|
|
class DeadMachineInstructionElimImpl {
|
|
const MachineRegisterInfo *MRI = nullptr;
|
|
const TargetInstrInfo *TII = nullptr;
|
|
LiveRegUnits LivePhysRegs;
|
|
|
|
public:
|
|
bool runImpl(MachineFunction &MF);
|
|
|
|
private:
|
|
bool eliminateDeadMI(MachineFunction &MF);
|
|
};
|
|
|
|
class DeadMachineInstructionElim : public MachineFunctionPass {
|
|
public:
|
|
static char ID; // Pass identification, replacement for typeid
|
|
|
|
DeadMachineInstructionElim() : MachineFunctionPass(ID) {
|
|
initializeDeadMachineInstructionElimPass(*PassRegistry::getPassRegistry());
|
|
}
|
|
|
|
bool runOnMachineFunction(MachineFunction &MF) override {
|
|
if (skipFunction(MF.getFunction()))
|
|
return false;
|
|
return DeadMachineInstructionElimImpl().runImpl(MF);
|
|
}
|
|
|
|
void getAnalysisUsage(AnalysisUsage &AU) const override {
|
|
AU.setPreservesCFG();
|
|
MachineFunctionPass::getAnalysisUsage(AU);
|
|
}
|
|
};
|
|
} // namespace
|
|
|
|
PreservedAnalyses
|
|
DeadMachineInstructionElimPass::run(MachineFunction &MF,
|
|
MachineFunctionAnalysisManager &) {
|
|
if (!DeadMachineInstructionElimImpl().runImpl(MF))
|
|
return PreservedAnalyses::all();
|
|
PreservedAnalyses PA = getMachineFunctionPassPreservedAnalyses();
|
|
PA.preserveSet<CFGAnalyses>();
|
|
return PA;
|
|
}
|
|
|
|
char DeadMachineInstructionElim::ID = 0;
|
|
char &llvm::DeadMachineInstructionElimID = DeadMachineInstructionElim::ID;
|
|
|
|
INITIALIZE_PASS(DeadMachineInstructionElim, DEBUG_TYPE,
|
|
"Remove dead machine instructions", false, false)
|
|
|
|
bool DeadMachineInstructionElimImpl::runImpl(MachineFunction &MF) {
|
|
MRI = &MF.getRegInfo();
|
|
|
|
const TargetSubtargetInfo &ST = MF.getSubtarget();
|
|
TII = ST.getInstrInfo();
|
|
LivePhysRegs.init(*ST.getRegisterInfo());
|
|
|
|
bool AnyChanges = eliminateDeadMI(MF);
|
|
while (AnyChanges && eliminateDeadMI(MF))
|
|
;
|
|
return AnyChanges;
|
|
}
|
|
|
|
bool DeadMachineInstructionElimImpl::eliminateDeadMI(MachineFunction &MF) {
|
|
bool AnyChanges = false;
|
|
|
|
// Loop over all instructions in all blocks, from bottom to top, so that it's
|
|
// more likely that chains of dependent but ultimately dead instructions will
|
|
// be cleaned up.
|
|
for (MachineBasicBlock *MBB : post_order(&MF)) {
|
|
LivePhysRegs.addLiveOuts(*MBB);
|
|
|
|
// Now scan the instructions and delete dead ones, tracking physreg
|
|
// liveness as we go.
|
|
for (MachineInstr &MI : make_early_inc_range(reverse(*MBB))) {
|
|
// If the instruction is dead, delete it!
|
|
if (MI.isDead(*MRI, &LivePhysRegs)) {
|
|
LLVM_DEBUG(dbgs() << "DeadMachineInstructionElim: DELETING: " << MI);
|
|
// It is possible that some DBG_VALUE instructions refer to this
|
|
// instruction. They will be deleted in the live debug variable
|
|
// analysis.
|
|
MI.eraseFromParent();
|
|
AnyChanges = true;
|
|
++NumDeletes;
|
|
continue;
|
|
}
|
|
LivePhysRegs.stepBackward(MI);
|
|
}
|
|
}
|
|
LivePhysRegs.clear();
|
|
return AnyChanges;
|
|
}
|