uint32_t TR::X86FPConvertToIntSnippet::getLength(int32_t estimatedSnippetStart)
{
uint32_t length = 11;
TR::Machine * machine = cg()->machine();
if (toRealRegister(_convertInstruction->getTargetRegister())->getRegisterNumber() != TR::RealRegister::eax)
{
// MOV R, eax
// XCHG R, eax
//
length += 3;
}
if (_convertInstruction->getIA32RegMemInstruction())
{
// FST [esp], st0
length += 3;
}
else
{
// MOVSS [esp], R
length += 5;
}
return length + estimateRestartJumpLength(estimatedSnippetStart + length);
}
uint32_t TR::AMD64FPConversionSnippet::getLength(int32_t estimatedSnippetStart)
{
// *this swipeable for debugging purposes
uint32_t length = 11;
TR::Machine *machine = cg()->machine();
if (toRealRegister(_convertInstruction->getTargetRegister())->getRegisterNumber() != TR::RealRegister::eax)
{
// MOV R, rax
// XCHG R, rax
//
// 3 instruction/modRM bytes + 2 REX prefixes
//
length += (3 + 2);
}
TR::X86RegRegInstruction *instr = _convertInstruction->getIA32RegRegInstruction();
TR_ASSERT(instr != NULL, "f2i conversion instruction must be either L4RegMem or CVTTSS2SIRegReg\n");
TR::RealRegister *sourceRegister = toRealRegister(instr->getSourceRegister());
if (sourceRegister->getRegisterNumber() != TR::RealRegister::xmm0)
{
length +=
sizeof(pushBinary) + sizeof(popBinary) // push and pop
+ 4 + (sourceRegister->rexBits(TR::RealRegister::REX_B, false)? 1 : 0) // MOVSD xmm0, source
;
}
return length + estimateRestartJumpLength(estimatedSnippetStart + length);
}
uint32_t TR::X86FPConvertToLongSnippet::getLength(int32_t estimatedSnippetStart)
{
uint32_t length = 5;
analyseLongConversion();
// Mask off the FXCH flag.
//
uint8_t action = _registerActions[ _action & 0x7f ];
if (_action & kNeedFXCH)
{
// symmetric FXCHs
//
length += 4;
}
if (action & kPreserveEAX)
{
// PUSH eax 1
// POP eax 1
//
length += 2;
}
if (action & kPreserveEDX)
{
// PUSH edx 1
// POP edx 1
//
length += 2;
}
if (action & kMOVLow)
{
length += 2;
}
if (action & kMOVHigh)
{
length += 2;
}
if (action & kXCHG)
{
length++;
}
return length + estimateRestartJumpLength(estimatedSnippetStart + length);
}
