// Update cr0 with value static void updateConditionRegister(PPCEmuAssembler& a, const asmjit::X86GpReg& value, const asmjit::X86GpReg& tmp, const asmjit::X86GpReg& tmp2) { auto crtarget = 0; auto crshift = (7 - crtarget) * 4; a.mov(tmp, a.ppccr); a.and_(tmp, ~(0xF << crshift)); a.cmp(value, 0); a.lahf(); a.mov(tmp2, 0); a.sete(tmp2.r8()); a.shl(tmp2, crshift + ConditionRegisterFlag::ZeroShift); a.or_(tmp, tmp2); a.sahf(); a.mov(tmp2, 0); a.setg(tmp2.r8()); a.shl(tmp2, crshift + ConditionRegisterFlag::PositiveShift); a.or_(tmp, tmp2); a.sahf(); a.mov(tmp2, 0); a.setl(tmp2.r8()); a.shl(tmp2, crshift + ConditionRegisterFlag::NegativeShift); a.or_(tmp, tmp2); a.mov(tmp2, a.ppcxer); a.and_(tmp2, XERegisterBits::StickyOV); a.shiftTo(tmp2, XERegisterBits::StickyOVShift, crshift + ConditionRegisterFlag::SummaryOverflowShift); a.or_(tmp, tmp2); a.mov(a.ppccr, tmp); }
static bool cmpGeneric(PPCEmuAssembler& a, Instruction instr) { uint32_t crshift = (7 - instr.crfD) * 4; // Load CRF a.mov(a.edx, a.ppccr); // Mask CRF uint32_t mask = 0xFFFFFFFF; mask &= ~(0xF << crshift); a.and_(a.edx, mask); // Summary Overflow a.mov(a.eax, a.ppcxer); a.and_(a.eax, XERegisterBits::StickyOV); a.shr(a.eax, XERegisterBits::StickyOVShift); a.shl(a.eax, ConditionRegisterFlag::SummaryOverflowShift << crshift); a.or_(a.edx, a.eax); // Perform Comparison a.mov(a.eax, a.ppcgpr[instr.rA]); if (flags & CmpImmediate) { if (std::is_signed<Type>::value) { a.mov(a.ecx, sign_extend<16>(instr.simm)); } else { a.mov(a.ecx, instr.uimm); } } else { a.mov(a.ecx, a.ppcgpr[instr.rB]); } a.cmp(a.eax, a.ecx); a.mov(a.r8d, 0); if (std::is_unsigned<Type>::value) { a.seta(a.r8d.r8()); } else { a.setg(a.r8d.r8()); } a.mov(a.r9d, 0); if (std::is_unsigned<Type>::value) { a.setb(a.r9d.r8()); } else { a.setl(a.r9d.r8()); } a.mov(a.ecx, 0); a.sete(a.ecx.r8()); a.shl(a.ecx, crshift + ConditionRegisterFlag::ZeroShift); a.or_(a.edx, a.ecx); a.mov(a.ecx, a.r8d); a.shl(a.ecx, crshift + ConditionRegisterFlag::PositiveShift); a.or_(a.edx, a.ecx); a.mov(a.ecx, a.r9d); a.shl(a.ecx, crshift + ConditionRegisterFlag::NegativeShift); a.or_(a.edx, a.ecx); a.mov(a.ppccr, a.edx); return true; }