1//===-- AlphaBranchSelector.cpp - Convert Pseudo branchs ----------*- C++ -*-=//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// Replace Pseudo COND_BRANCH_* with their appropriate real branch
11// Simplified version of the PPC Branch Selector
12//
13//===----------------------------------------------------------------------===//
14
15#include "Alpha.h"
16#include "AlphaInstrInfo.h"
17#include "llvm/CodeGen/MachineFunctionPass.h"
18#include "llvm/Target/TargetMachine.h"
19#include "llvm/MC/MCAsmInfo.h"
20using namespace llvm;
21
22namespace {
23  struct AlphaBSel : public MachineFunctionPass {
24    static char ID;
25    AlphaBSel() : MachineFunctionPass(ID) {}
26
27    virtual bool runOnMachineFunction(MachineFunction &Fn);
28
29    virtual const char *getPassName() const {
30      return "Alpha Branch Selection";
31    }
32  };
33  char AlphaBSel::ID = 0;
34}
35
36/// createAlphaBranchSelectionPass - returns an instance of the Branch Selection
37/// Pass
38///
39FunctionPass *llvm::createAlphaBranchSelectionPass() {
40  return new AlphaBSel();
41}
42
43bool AlphaBSel::runOnMachineFunction(MachineFunction &Fn) {
44
45  for (MachineFunction::iterator MFI = Fn.begin(), E = Fn.end(); MFI != E;
46       ++MFI) {
47    MachineBasicBlock *MBB = MFI;
48
49    for (MachineBasicBlock::iterator MBBI = MBB->begin(), EE = MBB->end();
50         MBBI != EE; ++MBBI) {
51      if (MBBI->getOpcode() == Alpha::COND_BRANCH_I ||
52          MBBI->getOpcode() == Alpha::COND_BRANCH_F) {
53
54        // condbranch operands:
55        // 0. bc opcode
56        // 1. reg
57        // 2. target MBB
58        const TargetInstrInfo *TII = Fn.getTarget().getInstrInfo();
59        MBBI->setDesc(TII->get(MBBI->getOperand(0).getImm()));
60      }
61    }
62  }
63
64  return true;
65}
66
67