mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-01-05 12:31:33 +00:00
a01c7dbaab
This commit changes the ISEL patterns to use a CCBITRC operand instead of a "pred" operand. This matches the actual instruction text more directly, and simplifies use of ISEL with the asm parser. In addition, this change allows some simplification of handling the "pred" operand, as this is now only used by BCC. No change in generated code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178003 91177308-0d34-0410-b5e6-96231b3b80d8
295 lines
8.9 KiB
C++
295 lines
8.9 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/PPCBaseInfo.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: 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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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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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: 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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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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