[InstCombine] Signed saturation patterns
[llvm-core.git] / lib / Target / XCore / XCoreFrameToArgsOffsetElim.cpp
blobb5dbdea98eea1f6d4226b256ef0838719d92a8d6
1 //===-- XCoreFrameToArgsOffsetElim.cpp ----------------------------*- C++ -*-=//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // Replace Pseudo FRAME_TO_ARGS_OFFSET with the appropriate real offset.
11 //===----------------------------------------------------------------------===//
13 #include "XCore.h"
14 #include "XCoreInstrInfo.h"
15 #include "XCoreSubtarget.h"
16 #include "llvm/CodeGen/MachineFrameInfo.h"
17 #include "llvm/CodeGen/MachineFunctionPass.h"
18 #include "llvm/CodeGen/MachineInstrBuilder.h"
19 #include "llvm/Support/raw_ostream.h"
20 #include "llvm/Target/TargetMachine.h"
21 using namespace llvm;
23 namespace {
24 struct XCoreFTAOElim : public MachineFunctionPass {
25 static char ID;
26 XCoreFTAOElim() : MachineFunctionPass(ID) {}
28 bool runOnMachineFunction(MachineFunction &Fn) override;
29 MachineFunctionProperties getRequiredProperties() const override {
30 return MachineFunctionProperties().set(
31 MachineFunctionProperties::Property::NoVRegs);
34 StringRef getPassName() const override {
35 return "XCore FRAME_TO_ARGS_OFFSET Elimination";
38 char XCoreFTAOElim::ID = 0;
41 /// createXCoreFrameToArgsOffsetEliminationPass - returns an instance of the
42 /// Frame to args offset elimination pass
43 FunctionPass *llvm::createXCoreFrameToArgsOffsetEliminationPass() {
44 return new XCoreFTAOElim();
47 bool XCoreFTAOElim::runOnMachineFunction(MachineFunction &MF) {
48 const XCoreInstrInfo &TII =
49 *static_cast<const XCoreInstrInfo *>(MF.getSubtarget().getInstrInfo());
50 unsigned StackSize = MF.getFrameInfo().getStackSize();
51 for (MachineFunction::iterator MFI = MF.begin(), E = MF.end(); MFI != E;
52 ++MFI) {
53 MachineBasicBlock &MBB = *MFI;
54 for (MachineBasicBlock::iterator MBBI = MBB.begin(), EE = MBB.end();
55 MBBI != EE; ++MBBI) {
56 if (MBBI->getOpcode() == XCore::FRAME_TO_ARGS_OFFSET) {
57 MachineInstr &OldInst = *MBBI;
58 Register Reg = OldInst.getOperand(0).getReg();
59 MBBI = TII.loadImmediate(MBB, MBBI, Reg, StackSize);
60 OldInst.eraseFromParent();
64 return true;