114 lines
4.2 KiB
C++
114 lines
4.2 KiB
C++
//=== HexagonSplitConst32AndConst64.cpp - split CONST32/Const64 into HI/LO ===//
|
|
//
|
|
// 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
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// When the compiler is invoked with no small data, for instance, with the -G0
|
|
// command line option, then all CONST* opcodes should be broken down into
|
|
// appropriate LO and HI instructions. This splitting is done by this pass.
|
|
// The only reason this is not done in the DAG lowering itself is that there
|
|
// is no simple way of getting the register allocator to allot the same hard
|
|
// register to the result of LO and HI instructions. This pass is always
|
|
// scheduled after register allocation.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "HexagonSubtarget.h"
|
|
#include "HexagonTargetMachine.h"
|
|
#include "HexagonTargetObjectFile.h"
|
|
#include "llvm/CodeGen/MachineFunctionPass.h"
|
|
#include "llvm/CodeGen/MachineInstrBuilder.h"
|
|
#include "llvm/CodeGen/Passes.h"
|
|
#include "llvm/CodeGen/TargetInstrInfo.h"
|
|
#include "llvm/CodeGen/TargetRegisterInfo.h"
|
|
|
|
using namespace llvm;
|
|
|
|
#define DEBUG_TYPE "xfer"
|
|
|
|
namespace llvm {
|
|
FunctionPass *createHexagonSplitConst32AndConst64();
|
|
void initializeHexagonSplitConst32AndConst64Pass(PassRegistry&);
|
|
}
|
|
|
|
namespace {
|
|
class HexagonSplitConst32AndConst64 : public MachineFunctionPass {
|
|
public:
|
|
static char ID;
|
|
HexagonSplitConst32AndConst64() : MachineFunctionPass(ID) {
|
|
PassRegistry &R = *PassRegistry::getPassRegistry();
|
|
initializeHexagonSplitConst32AndConst64Pass(R);
|
|
}
|
|
StringRef getPassName() const override {
|
|
return "Hexagon Split Const32s and Const64s";
|
|
}
|
|
bool runOnMachineFunction(MachineFunction &Fn) override;
|
|
MachineFunctionProperties getRequiredProperties() const override {
|
|
return MachineFunctionProperties().set(
|
|
MachineFunctionProperties::Property::NoVRegs);
|
|
}
|
|
};
|
|
}
|
|
|
|
char HexagonSplitConst32AndConst64::ID = 0;
|
|
|
|
INITIALIZE_PASS(HexagonSplitConst32AndConst64, "split-const-for-sdata",
|
|
"Hexagon Split Const32s and Const64s", false, false)
|
|
|
|
bool HexagonSplitConst32AndConst64::runOnMachineFunction(MachineFunction &Fn) {
|
|
auto &HST = Fn.getSubtarget<HexagonSubtarget>();
|
|
auto &HTM = static_cast<const HexagonTargetMachine&>(Fn.getTarget());
|
|
auto &TLOF = *HTM.getObjFileLowering();
|
|
if (HST.useSmallData() && TLOF.isSmallDataEnabled(HTM))
|
|
return false;
|
|
|
|
const TargetInstrInfo *TII = HST.getInstrInfo();
|
|
const TargetRegisterInfo *TRI = HST.getRegisterInfo();
|
|
|
|
// Loop over all of the basic blocks
|
|
for (MachineBasicBlock &B : Fn) {
|
|
for (auto I = B.begin(), E = B.end(); I != E; ) {
|
|
MachineInstr &MI = *I;
|
|
++I;
|
|
unsigned Opc = MI.getOpcode();
|
|
|
|
if (Opc == Hexagon::CONST32) {
|
|
Register DestReg = MI.getOperand(0).getReg();
|
|
uint64_t ImmValue = MI.getOperand(1).getImm();
|
|
const DebugLoc &DL = MI.getDebugLoc();
|
|
BuildMI(B, MI, DL, TII->get(Hexagon::A2_tfrsi), DestReg)
|
|
.addImm(ImmValue);
|
|
B.erase(&MI);
|
|
} else if (Opc == Hexagon::CONST64) {
|
|
Register DestReg = MI.getOperand(0).getReg();
|
|
int64_t ImmValue = MI.getOperand(1).getImm();
|
|
const DebugLoc &DL = MI.getDebugLoc();
|
|
Register DestLo = TRI->getSubReg(DestReg, Hexagon::isub_lo);
|
|
Register DestHi = TRI->getSubReg(DestReg, Hexagon::isub_hi);
|
|
|
|
int32_t LowWord = (ImmValue & 0xFFFFFFFF);
|
|
int32_t HighWord = (ImmValue >> 32) & 0xFFFFFFFF;
|
|
|
|
BuildMI(B, MI, DL, TII->get(Hexagon::A2_tfrsi), DestLo)
|
|
.addImm(LowWord);
|
|
BuildMI(B, MI, DL, TII->get(Hexagon::A2_tfrsi), DestHi)
|
|
.addImm(HighWord);
|
|
B.erase(&MI);
|
|
}
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Public Constructor Functions
|
|
//===----------------------------------------------------------------------===//
|
|
FunctionPass *llvm::createHexagonSplitConst32AndConst64() {
|
|
return new HexagonSplitConst32AndConst64();
|
|
}
|