1 //===-- ARMMul.cpp - Define TargetMachine for A5CRM -----------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the "Instituto Nokia de Tecnologia" and
6 // is distributed under the University of Illinois Open Source
7 // License. See LICENSE.TXT for details.
9 //===----------------------------------------------------------------------===//
11 // Modify the ARM multiplication instructions so that Rd{Hi,Lo} and Rm are distinct
13 //===----------------------------------------------------------------------===//
17 #include "llvm/CodeGen/MachineInstrBuilder.h"
18 #include "llvm/CodeGen/MachineFunctionPass.h"
19 #include "llvm/Support/Compiler.h"
24 class VISIBILITY_HIDDEN FixMul : public MachineFunctionPass {
25 virtual bool runOnMachineFunction(MachineFunction &MF);
29 FunctionPass *llvm::createARMFixMulPass() { return new FixMul(); }
31 bool FixMul::runOnMachineFunction(MachineFunction &MF) {
34 for (MachineFunction::iterator BB = MF.begin(), E = MF.end();
36 MachineBasicBlock &MBB = *BB;
38 for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end();
42 int Op = MI->getOpcode();
46 MachineOperand &RdOp = MI->getOperand(0);
47 MachineOperand &RmOp = MI->getOperand(1);
48 MachineOperand &RsOp = MI->getOperand(2);
50 unsigned Rd = RdOp.getReg();
51 unsigned Rm = RmOp.getReg();
52 unsigned Rs = RsOp.getReg();
57 //Rd and Rm must be distinct, but Rd can be equal to Rs.
62 unsigned scratch = Op == ARM::MUL ? ARM::R12 : ARM::R0;
63 BuildMI(MBB, I, ARM::MOV, 3, scratch).addReg(Rm).addImm(0)
64 .addImm(ARMShift::LSL);