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[mips] Put conditions when we need to expand memory operand into a separate function. NFC 

`expandMemInst` expects instruction with 3 or 4 operands and the last
operand requires expanding. It's redundant to scan all operands in a
loop. We can check the last operands.
This commit is contained in:
Simon Atanasyan 2019-11-20 15:27:27 +03:00
parent 452d0b21e0
commit 8ac68f9dc5
1 changed files with 36 additions and 29 deletions
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65
llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
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@ -1815,6 +1815,37 @@ static bool isEvaluated(const MCExpr *Expr) {
return false;
}
static bool needsExpandMemInst(MCInst &Inst) {
const MCInstrDesc &MCID = getInstDesc(Inst.getOpcode());
unsigned NumOp = MCID.getNumOperands();
if (NumOp != 3 && NumOp != 4)
return false;
const MCOperandInfo &OpInfo = MCID.OpInfo[NumOp - 1];
if (OpInfo.OperandType != MCOI::OPERAND_MEMORY &&
OpInfo.OperandType != MCOI::OPERAND_UNKNOWN)
return false;
MCOperand &Op = Inst.getOperand(NumOp - 1);
if (Op.isImm()) {
// Offset can't exceed 16bit value.
return !isInt<16>(Op.getImm());
}
if (Op.isExpr()) {
const MCExpr *Expr = Op.getExpr();
if (Expr->getKind() != MCExpr::SymbolRef)
return !isEvaluated(Expr);
// Expand symbol.
const MCSymbolRefExpr *SR = static_cast<const MCSymbolRefExpr *>(Expr);
return SR->getKind() == MCSymbolRefExpr::VK_None;
}
return false;
}
bool MipsAsmParser::processInstruction(MCInst &Inst, SMLoc IDLoc,
MCStreamer &Out,
const MCSubtargetInfo *STI) {
@ -2102,35 +2133,11 @@ bool MipsAsmParser::processInstruction(MCInst &Inst, SMLoc IDLoc,
if ((MCID.mayLoad() || MCID.mayStore()) && !IsPCRelativeLoad) {
// Check the offset of memory operand, if it is a symbol
// reference or immediate we may have to expand instructions.
for (unsigned i = 0; i < MCID.getNumOperands(); i++) {
const MCOperandInfo &OpInfo = MCID.OpInfo[i];
if ((OpInfo.OperandType == MCOI::OPERAND_MEMORY) ||
(OpInfo.OperandType == MCOI::OPERAND_UNKNOWN)) {
MCOperand &Op = Inst.getOperand(i);
if (Op.isImm()) {
if (!isInt<16>(Op.getImm())) {
// Offset can't exceed 16bit value.
expandMemInst(Inst, IDLoc, Out, STI, MCID.mayLoad());
return getParser().hasPendingError();
}
} else if (Op.isExpr()) {
const MCExpr *Expr = Op.getExpr();
if (Expr->getKind() == MCExpr::SymbolRef) {
const MCSymbolRefExpr *SR =
static_cast<const MCSymbolRefExpr *>(Expr);
if (SR->getKind() == MCSymbolRefExpr::VK_None) {
// Expand symbol.
expandMemInst(Inst, IDLoc, Out, STI, MCID.mayLoad());
return getParser().hasPendingError();
}
} else if (!isEvaluated(Expr)) {
expandMemInst(Inst, IDLoc, Out, STI, MCID.mayLoad());
return getParser().hasPendingError();
}
}
}
} // for
} // if load/store
if (needsExpandMemInst(Inst)) {
expandMemInst(Inst, IDLoc, Out, STI, MCID.mayLoad());
return getParser().hasPendingError();
}
}
if (inMicroMipsMode()) {
if (MCID.mayLoad() && Opcode != Mips::LWP_MM) {