mirror of
https://github.com/llvm/llvm-project.git
synced 2025-05-14 20:16:06 +00:00
a3936a6c19
InstrRefBasedLDV used to try and determine which values are in which registers using a lattice approach; however this is hard to understand, and broken in various ways. This patch replaces that approach with a standard SSA approach using existing LLVM utilities. PHIs are placed at dominance frontiers; value propagation then eliminates un-necessary PHIs. This patch also adds a bunch of unit tests that should cover many of the weirder forms of control flow. Differential Revision: https://reviews.llvm.org/D110173
41 lines
1.5 KiB
C++
41 lines
1.5 KiB
C++
//===- LiveDebugValues.cpp - Tracking Debug Value MIs ---------*- C++ -*---===//
|
|
//
|
|
// 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
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_LIB_CODEGEN_LIVEDEBUGVALUES_LIVEDEBUGVALUES_H
|
|
#define LLVM_LIB_CODEGEN_LIVEDEBUGVALUES_LIVEDEBUGVALUES_H
|
|
|
|
#include "llvm/CodeGen/MachineDominators.h"
|
|
#include "llvm/CodeGen/MachineFunction.h"
|
|
#include "llvm/CodeGen/TargetPassConfig.h"
|
|
|
|
namespace llvm {
|
|
|
|
// Inline namespace for types / symbols shared between different
|
|
// LiveDebugValues implementations.
|
|
inline namespace SharedLiveDebugValues {
|
|
|
|
// Expose a base class for LiveDebugValues interfaces to inherit from. This
|
|
// allows the generic LiveDebugValues pass handles to call into the
|
|
// implementation.
|
|
class LDVImpl {
|
|
public:
|
|
virtual bool ExtendRanges(MachineFunction &MF, MachineDominatorTree *DomTree,
|
|
TargetPassConfig *TPC, unsigned InputBBLimit,
|
|
unsigned InputDbgValLimit) = 0;
|
|
virtual ~LDVImpl() {}
|
|
};
|
|
|
|
} // namespace SharedLiveDebugValues
|
|
|
|
// Factory functions for LiveDebugValues implementations.
|
|
extern LDVImpl *makeVarLocBasedLiveDebugValues();
|
|
extern LDVImpl *makeInstrRefBasedLiveDebugValues();
|
|
} // namespace llvm
|
|
|
|
#endif // LLVM_LIB_CODEGEN_LIVEDEBUGVALUES_LIVEDEBUGVALUES_H
|