forked from OSchip/llvm-project
141 lines
4.1 KiB
C++
141 lines
4.1 KiB
C++
//===-- WebAssemblyInstrInfo.cpp - WebAssembly Instruction Information ----===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
///
|
|
/// \file
|
|
/// \brief This file contains the WebAssembly implementation of the
|
|
/// TargetInstrInfo class.
|
|
///
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "WebAssemblyInstrInfo.h"
|
|
#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
|
|
#include "WebAssemblySubtarget.h"
|
|
#include "llvm/CodeGen/MachineFrameInfo.h"
|
|
#include "llvm/CodeGen/MachineInstrBuilder.h"
|
|
#include "llvm/CodeGen/MachineMemOperand.h"
|
|
#include "llvm/CodeGen/MachineRegisterInfo.h"
|
|
using namespace llvm;
|
|
|
|
#define DEBUG_TYPE "wasm-instr-info"
|
|
|
|
#define GET_INSTRINFO_CTOR_DTOR
|
|
#include "WebAssemblyGenInstrInfo.inc"
|
|
|
|
WebAssemblyInstrInfo::WebAssemblyInstrInfo(const WebAssemblySubtarget &STI)
|
|
: RI(STI.getTargetTriple()) {}
|
|
|
|
void WebAssemblyInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
|
|
MachineBasicBlock::iterator I,
|
|
DebugLoc DL, unsigned DestReg,
|
|
unsigned SrcReg, bool KillSrc) const {
|
|
const TargetRegisterClass *RC =
|
|
MBB.getParent()->getRegInfo().getRegClass(SrcReg);
|
|
|
|
unsigned CopyLocalOpcode;
|
|
if (RC == &WebAssembly::I32RegClass)
|
|
CopyLocalOpcode = WebAssembly::COPY_LOCAL_I32;
|
|
else if (RC == &WebAssembly::I64RegClass)
|
|
CopyLocalOpcode = WebAssembly::COPY_LOCAL_I64;
|
|
else if (RC == &WebAssembly::F32RegClass)
|
|
CopyLocalOpcode = WebAssembly::COPY_LOCAL_F32;
|
|
else if (RC == &WebAssembly::F64RegClass)
|
|
CopyLocalOpcode = WebAssembly::COPY_LOCAL_F64;
|
|
else
|
|
llvm_unreachable("Unexpected register class");
|
|
|
|
BuildMI(MBB, I, DL, get(CopyLocalOpcode), DestReg)
|
|
.addReg(SrcReg, KillSrc ? RegState::Kill : 0);
|
|
}
|
|
|
|
// Branch analysis.
|
|
bool WebAssemblyInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,
|
|
MachineBasicBlock *&TBB,
|
|
MachineBasicBlock *&FBB,
|
|
SmallVectorImpl<MachineOperand> &Cond,
|
|
bool AllowModify) const {
|
|
bool HaveCond = false;
|
|
for (MachineInstr &MI : iterator_range<MachineBasicBlock::instr_iterator>(
|
|
MBB.getFirstInstrTerminator(), MBB.instr_end())) {
|
|
switch (MI.getOpcode()) {
|
|
default:
|
|
// Unhandled instruction; bail out.
|
|
return true;
|
|
case WebAssembly::BR_IF:
|
|
if (HaveCond)
|
|
return true;
|
|
Cond.push_back(MI.getOperand(0));
|
|
TBB = MI.getOperand(1).getMBB();
|
|
HaveCond = true;
|
|
break;
|
|
case WebAssembly::BR:
|
|
if (!HaveCond)
|
|
TBB = MI.getOperand(0).getMBB();
|
|
else
|
|
FBB = MI.getOperand(0).getMBB();
|
|
break;
|
|
}
|
|
if (MI.isBarrier())
|
|
break;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
unsigned WebAssemblyInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
|
|
MachineBasicBlock::instr_iterator I = MBB.instr_end();
|
|
unsigned Count = 0;
|
|
|
|
while (I != MBB.instr_begin()) {
|
|
--I;
|
|
if (I->isDebugValue())
|
|
continue;
|
|
if (!I->isTerminator())
|
|
break;
|
|
// Remove the branch.
|
|
I->eraseFromParent();
|
|
I = MBB.instr_end();
|
|
++Count;
|
|
}
|
|
|
|
return Count;
|
|
}
|
|
|
|
unsigned WebAssemblyInstrInfo::InsertBranch(
|
|
MachineBasicBlock &MBB, MachineBasicBlock *TBB, MachineBasicBlock *FBB,
|
|
ArrayRef<MachineOperand> Cond, DebugLoc DL) const {
|
|
assert(Cond.size() <= 1);
|
|
|
|
if (Cond.empty()) {
|
|
if (!TBB)
|
|
return 0;
|
|
|
|
BuildMI(&MBB, DL, get(WebAssembly::BR)).addMBB(TBB);
|
|
return 1;
|
|
}
|
|
|
|
BuildMI(&MBB, DL, get(WebAssembly::BR_IF))
|
|
.addOperand(Cond[0])
|
|
.addMBB(TBB);
|
|
if (!FBB)
|
|
return 1;
|
|
|
|
BuildMI(&MBB, DL, get(WebAssembly::BR)).addMBB(FBB);
|
|
return 2;
|
|
}
|
|
|
|
bool WebAssemblyInstrInfo::ReverseBranchCondition(
|
|
SmallVectorImpl<MachineOperand> &Cond) const {
|
|
assert(Cond.size() == 1);
|
|
|
|
// TODO: Add branch reversal here... And re-enable MachineBlockPlacementID
|
|
// when we do.
|
|
|
|
return true;
|
|
}
|