mirror of
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296 lines
9.0 KiB
C++
296 lines
9.0 KiB
C++
//===-- PPCInstPrinter.cpp - Convert PPC MCInst to assembly syntax --------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This class prints an PPC MCInst to a .s file.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "asm-printer"
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#include "PPCInstPrinter.h"
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#include "PPCPredicates.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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#define GET_INSTRUCTION_NAME
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#include "PPCGenAsmWriter.inc"
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StringRef PPCInstPrinter::getOpcodeName(unsigned Opcode) const {
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return getInstructionName(Opcode);
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}
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void PPCInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
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OS << getRegisterName(RegNo);
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}
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void PPCInstPrinter::printInst(const MCInst *MI, raw_ostream &O) {
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// Check for slwi/srwi mnemonics.
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if (MI->getOpcode() == PPC::RLWINM) {
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unsigned char SH = MI->getOperand(2).getImm();
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unsigned char MB = MI->getOperand(3).getImm();
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unsigned char ME = MI->getOperand(4).getImm();
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bool useSubstituteMnemonic = false;
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if (SH <= 31 && MB == 0 && ME == (31-SH)) {
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O << "\tslwi "; useSubstituteMnemonic = true;
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}
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if (SH <= 31 && MB == (32-SH) && ME == 31) {
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O << "\tsrwi "; useSubstituteMnemonic = true;
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SH = 32-SH;
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}
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if (useSubstituteMnemonic) {
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printOperand(MI, 0, O);
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O << ", ";
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printOperand(MI, 1, O);
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O << ", " << (unsigned int)SH;
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return;
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}
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}
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if ((MI->getOpcode() == PPC::OR || MI->getOpcode() == PPC::OR8) &&
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MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) {
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O << "\tmr ";
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printOperand(MI, 0, O);
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O << ", ";
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printOperand(MI, 1, O);
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return;
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}
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if (MI->getOpcode() == PPC::RLDICR) {
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unsigned char SH = MI->getOperand(2).getImm();
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unsigned char ME = MI->getOperand(3).getImm();
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// rldicr RA, RS, SH, 63-SH == sldi RA, RS, SH
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if (63-SH == ME) {
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O << "\tsldi ";
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printOperand(MI, 0, O);
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O << ", ";
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printOperand(MI, 1, O);
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O << ", " << (unsigned int)SH;
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return;
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}
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}
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printInstruction(MI, O);
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}
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void PPCInstPrinter::printPredicateOperand(const MCInst *MI, unsigned OpNo,
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raw_ostream &O,
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const char *Modifier) {
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assert(Modifier && "Must specify 'cc' or 'reg' as predicate op modifier!");
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unsigned Code = MI->getOperand(OpNo).getImm();
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if (StringRef(Modifier) == "cc") {
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switch ((PPC::Predicate)Code) {
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default: assert(0 && "Invalid predicate");
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case PPC::PRED_ALWAYS: return; // Don't print anything for always.
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case PPC::PRED_LT: O << "lt"; return;
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case PPC::PRED_LE: O << "le"; return;
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case PPC::PRED_EQ: O << "eq"; return;
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case PPC::PRED_GE: O << "ge"; return;
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case PPC::PRED_GT: O << "gt"; return;
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case PPC::PRED_NE: O << "ne"; return;
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case PPC::PRED_UN: O << "un"; return;
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case PPC::PRED_NU: O << "nu"; return;
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}
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}
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assert(StringRef(Modifier) == "reg" &&
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"Need to specify 'cc' or 'reg' as predicate op modifier!");
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// Don't print the register for 'always'.
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if (Code == PPC::PRED_ALWAYS) return;
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printOperand(MI, OpNo+1, O);
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}
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void PPCInstPrinter::printS5ImmOperand(const MCInst *MI, unsigned OpNo,
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raw_ostream &O) {
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char Value = MI->getOperand(OpNo).getImm();
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Value = (Value << (32-5)) >> (32-5);
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O << (int)Value;
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}
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void PPCInstPrinter::printU5ImmOperand(const MCInst *MI, unsigned OpNo,
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raw_ostream &O) {
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unsigned char Value = MI->getOperand(OpNo).getImm();
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assert(Value <= 31 && "Invalid u5imm argument!");
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O << (unsigned int)Value;
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}
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void PPCInstPrinter::printU6ImmOperand(const MCInst *MI, unsigned OpNo,
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raw_ostream &O) {
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unsigned char Value = MI->getOperand(OpNo).getImm();
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assert(Value <= 63 && "Invalid u6imm argument!");
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O << (unsigned int)Value;
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}
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void PPCInstPrinter::printS16ImmOperand(const MCInst *MI, unsigned OpNo,
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raw_ostream &O) {
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O << (short)MI->getOperand(OpNo).getImm();
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}
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void PPCInstPrinter::printU16ImmOperand(const MCInst *MI, unsigned OpNo,
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raw_ostream &O) {
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O << (unsigned short)MI->getOperand(OpNo).getImm();
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}
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void PPCInstPrinter::printS16X4ImmOperand(const MCInst *MI, unsigned OpNo,
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raw_ostream &O) {
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if (MI->getOperand(OpNo).isImm())
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O << (short)(MI->getOperand(OpNo).getImm()*4);
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else
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printOperand(MI, OpNo, O);
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}
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void PPCInstPrinter::printBranchOperand(const MCInst *MI, unsigned OpNo,
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raw_ostream &O) {
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if (!MI->getOperand(OpNo).isImm())
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return printOperand(MI, OpNo, O);
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// Branches can take an immediate operand. This is used by the branch
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// selection pass to print $+8, an eight byte displacement from the PC.
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O << "$+";
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printAbsAddrOperand(MI, OpNo, O);
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}
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void PPCInstPrinter::printAbsAddrOperand(const MCInst *MI, unsigned OpNo,
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raw_ostream &O) {
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O << (int)MI->getOperand(OpNo).getImm()*4;
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}
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void PPCInstPrinter::printcrbitm(const MCInst *MI, unsigned OpNo,
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raw_ostream &O) {
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unsigned CCReg = MI->getOperand(OpNo).getReg();
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unsigned RegNo;
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switch (CCReg) {
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default: assert(0 && "Unknown CR register");
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case PPC::CR0: RegNo = 0; break;
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case PPC::CR1: RegNo = 1; break;
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case PPC::CR2: RegNo = 2; break;
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case PPC::CR3: RegNo = 3; break;
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case PPC::CR4: RegNo = 4; break;
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case PPC::CR5: RegNo = 5; break;
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case PPC::CR6: RegNo = 6; break;
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case PPC::CR7: RegNo = 7; break;
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}
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O << (0x80 >> RegNo);
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}
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void PPCInstPrinter::printMemRegImm(const MCInst *MI, unsigned OpNo,
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raw_ostream &O) {
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printSymbolLo(MI, OpNo, O);
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O << '(';
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if (MI->getOperand(OpNo+1).getReg() == PPC::R0)
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O << "0";
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else
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printOperand(MI, OpNo+1, O);
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O << ')';
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}
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void PPCInstPrinter::printMemRegImmShifted(const MCInst *MI, unsigned OpNo,
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raw_ostream &O) {
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if (MI->getOperand(OpNo).isImm())
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printS16X4ImmOperand(MI, OpNo, O);
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else
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printSymbolLo(MI, OpNo, O);
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O << '(';
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if (MI->getOperand(OpNo+1).getReg() == PPC::R0)
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O << "0";
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else
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printOperand(MI, OpNo+1, O);
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O << ')';
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}
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void PPCInstPrinter::printMemRegReg(const MCInst *MI, unsigned OpNo,
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raw_ostream &O) {
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// When used as the base register, r0 reads constant zero rather than
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// the value contained in the register. For this reason, the darwin
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// assembler requires that we print r0 as 0 (no r) when used as the base.
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if (MI->getOperand(OpNo).getReg() == PPC::R0)
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O << "0";
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else
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printOperand(MI, OpNo, O);
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O << ", ";
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printOperand(MI, OpNo+1, O);
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}
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/// stripRegisterPrefix - This method strips the character prefix from a
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/// register name so that only the number is left. Used by for linux asm.
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static const char *stripRegisterPrefix(const char *RegName) {
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switch (RegName[0]) {
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case 'r':
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case 'f':
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case 'v': return RegName + 1;
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case 'c': if (RegName[1] == 'r') return RegName + 2;
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}
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return RegName;
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}
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void PPCInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
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raw_ostream &O) {
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const MCOperand &Op = MI->getOperand(OpNo);
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if (Op.isReg()) {
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const char *RegName = getRegisterName(Op.getReg());
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// The linux and AIX assembler does not take register prefixes.
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if (!isDarwinSyntax())
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RegName = stripRegisterPrefix(RegName);
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O << RegName;
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return;
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}
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if (Op.isImm()) {
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O << Op.getImm();
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return;
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}
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assert(Op.isExpr() && "unknown operand kind in printOperand");
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O << *Op.getExpr();
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}
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void PPCInstPrinter::printSymbolLo(const MCInst *MI, unsigned OpNo,
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raw_ostream &O) {
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if (MI->getOperand(OpNo).isImm())
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return printS16ImmOperand(MI, OpNo, O);
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// FIXME: This is a terrible hack because we can't encode lo16() as an operand
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// flag of a subtraction. See the FIXME in GetSymbolRef in PPCMCInstLower.
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if (MI->getOperand(OpNo).isExpr() &&
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isa<MCBinaryExpr>(MI->getOperand(OpNo).getExpr())) {
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O << "lo16(";
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printOperand(MI, OpNo, O);
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O << ')';
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} else {
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printOperand(MI, OpNo, O);
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}
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}
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void PPCInstPrinter::printSymbolHi(const MCInst *MI, unsigned OpNo,
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raw_ostream &O) {
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if (MI->getOperand(OpNo).isImm())
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return printS16ImmOperand(MI, OpNo, O);
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// FIXME: This is a terrible hack because we can't encode lo16() as an operand
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// flag of a subtraction. See the FIXME in GetSymbolRef in PPCMCInstLower.
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if (MI->getOperand(OpNo).isExpr() &&
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isa<MCBinaryExpr>(MI->getOperand(OpNo).getExpr())) {
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O << "ha16(";
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printOperand(MI, OpNo, O);
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O << ')';
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} else {
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printOperand(MI, OpNo, O);
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}
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}
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