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https://github.com/c64scene-ar/llvm-6502.git
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0b8594268f
Currently, all instructions taking s16imm operands support symbolic operands. However, for u16imm operands, we only support actual immediate integers. This causes the assembler to reject code like ori %r5, %r5, symbol@l This patch changes the u16imm operand definition to likewise accept symbolic operands. In fact, s16imm and u16imm can share the same encoding routine, now renamed to getImm16Encoding. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184944 91177308-0d34-0410-b5e6-96231b3b80d8
313 lines
8.8 KiB
C++
313 lines
8.8 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 "MCTargetDesc/PPCMCTargetDesc.h"
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#include "MCTargetDesc/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/MC/MCInstrInfo.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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#include "PPCGenAsmWriter.inc"
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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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StringRef Annot) {
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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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printAnnotation(O, Annot);
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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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printAnnotation(O, Annot);
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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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printAnnotation(O, Annot);
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return;
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}
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}
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printInstruction(MI, O);
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printAnnotation(O, Annot);
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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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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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case PPC::PRED_LT_MINUS:
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case PPC::PRED_LT_PLUS:
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case PPC::PRED_LT:
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O << "lt";
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return;
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case PPC::PRED_LE_MINUS:
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case PPC::PRED_LE_PLUS:
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case PPC::PRED_LE:
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O << "le";
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return;
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case PPC::PRED_EQ_MINUS:
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case PPC::PRED_EQ_PLUS:
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case PPC::PRED_EQ:
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O << "eq";
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return;
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case PPC::PRED_GE_MINUS:
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case PPC::PRED_GE_PLUS:
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case PPC::PRED_GE:
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O << "ge";
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return;
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case PPC::PRED_GT_MINUS:
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case PPC::PRED_GT_PLUS:
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case PPC::PRED_GT:
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O << "gt";
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return;
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case PPC::PRED_NE_MINUS:
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case PPC::PRED_NE_PLUS:
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case PPC::PRED_NE:
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O << "ne";
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return;
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case PPC::PRED_UN_MINUS:
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case PPC::PRED_UN_PLUS:
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case PPC::PRED_UN:
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O << "un";
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return;
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case PPC::PRED_NU_MINUS:
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case PPC::PRED_NU_PLUS:
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case PPC::PRED_NU:
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O << "nu";
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return;
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}
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llvm_unreachable("Invalid predicate code");
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}
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if (StringRef(Modifier) == "pm") {
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switch ((PPC::Predicate)Code) {
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case PPC::PRED_LT:
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case PPC::PRED_LE:
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case PPC::PRED_EQ:
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case PPC::PRED_GE:
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case PPC::PRED_GT:
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case PPC::PRED_NE:
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case PPC::PRED_UN:
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case PPC::PRED_NU:
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return;
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case PPC::PRED_LT_MINUS:
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case PPC::PRED_LE_MINUS:
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case PPC::PRED_EQ_MINUS:
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case PPC::PRED_GE_MINUS:
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case PPC::PRED_GT_MINUS:
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case PPC::PRED_NE_MINUS:
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case PPC::PRED_UN_MINUS:
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case PPC::PRED_NU_MINUS:
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O << "-";
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return;
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case PPC::PRED_LT_PLUS:
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case PPC::PRED_LE_PLUS:
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case PPC::PRED_EQ_PLUS:
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case PPC::PRED_GE_PLUS:
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case PPC::PRED_GT_PLUS:
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case PPC::PRED_NE_PLUS:
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case PPC::PRED_UN_PLUS:
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case PPC::PRED_NU_PLUS:
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O << "+";
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return;
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}
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llvm_unreachable("Invalid predicate code");
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}
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assert(StringRef(Modifier) == "reg" &&
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"Need to specify 'cc', 'pm' or 'reg' as predicate op modifier!");
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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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int Value = MI->getOperand(OpNo).getImm();
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Value = SignExtend32<5>(Value);
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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 int 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 int 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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if (MI->getOperand(OpNo).isImm())
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O << (short)MI->getOperand(OpNo).getImm();
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else
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printOperand(MI, OpNo, O);
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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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if (MI->getOperand(OpNo).isImm())
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O << (unsigned short)MI->getOperand(OpNo).getImm();
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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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printAbsBranchOperand(MI, OpNo, O);
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}
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void PPCInstPrinter::printAbsBranchOperand(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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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: llvm_unreachable("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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printS16ImmOperand(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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