void
StackSym::SetIsConst()
{
Assert(this->m_isSingleDef);
Assert(this->m_instrDef);
IR::Opnd * src = this->m_instrDef->GetSrc1();
Assert(src->IsImmediateOpnd() || src->IsFloatConstOpnd() || src->IsSimd128ConstOpnd());
if (src->IsIntConstOpnd())
{
Assert(this->m_instrDef->m_opcode == Js::OpCode::Ld_I4 || this->m_instrDef->m_opcode == Js::OpCode::LdC_A_I4 || LowererMD::IsAssign(this->m_instrDef));
this->SetIsIntConst(src->AsIntConstOpnd()->GetValue());
}
else if (src->IsFloatConstOpnd())
{
Assert(this->m_instrDef->m_opcode == Js::OpCode::LdC_A_R8);
this->SetIsFloatConst();
}
else if (src->IsSimd128ConstOpnd()){
Assert(this->m_instrDef->m_opcode == Js::OpCode::Simd128_LdC);
this->SetIsSimd128Const();
}
else
{
Assert(this->m_instrDef->m_opcode == Js::OpCode::Ld_A || LowererMD::IsAssign(this->m_instrDef));
Assert(src->IsAddrOpnd());
IR::AddrOpnd * addrOpnd = src->AsAddrOpnd();
this->m_isConst = true;
if (addrOpnd->IsVar())
{
Js::Var var = addrOpnd->m_address;
if (Js::TaggedInt::Is(var))
{
this->m_isIntConst = true;
this->m_isTaggableIntConst = true;
}
else if (var && Js::JavascriptNumber::Is(var) && Js::JavascriptNumber::IsInt32_NoChecks(var))
{
this->m_isIntConst = true;
}
}
}
}
void
PeepsMD::PeepAssign(IR::Instr *instr)
{
IR::Opnd* dst = instr->GetDst();
IR::Opnd* src = instr->GetSrc1();
if(dst->IsRegOpnd() && instr->m_opcode == Js::OpCode::MOV)
{
if (src->IsImmediateOpnd() && src->GetImmediateValue(instr->m_func) == 0)
{
Assert(instr->GetSrc2() == NULL);
// 32-bit XOR has a smaller encoding
if (TySize[dst->GetType()] == MachPtr)
{
dst->SetType(TyInt32);
}
instr->m_opcode = Js::OpCode::XOR;
instr->ReplaceSrc1(dst);
instr->SetSrc2(dst);
}
else if (!instr->isInlineeEntryInstr)
{
if(src->IsIntConstOpnd() && src->GetSize() <= TySize[TyUint32])
{
dst->SetType(TyUint32);
}
else if(src->IsAddrOpnd() && (((size_t)src->AsAddrOpnd()->m_address >> 32) == 0 ))
{
instr->ReplaceSrc1(IR::IntConstOpnd::New(::Math::PointerCastToIntegral<UIntConstType>(src->AsAddrOpnd()->m_address), TyUint32, instr->m_func));
dst->SetType(TyUint32);
}
}
}
else if (((instr->m_opcode == Js::OpCode::MOVSD || instr->m_opcode == Js::OpCode::MOVSS)