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i86: fix shifts by very large (> 32) amounts. fixes ibm xt detection by

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the multi unique floppy controllers.
This commit is contained in:
Dirk Best 2014-02-14 18:43:35 +00:00
parent a4351b6342
commit 562c7367c0
1 changed files with 30 additions and 14 deletions
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44
src/emu/cpu/i86/i86inline.h
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@ -811,7 +811,9 @@ inline void i8086_common_cpu_device::RORC_WORD()
inline void i8086_common_cpu_device::SHL_BYTE(UINT8 c)
{
m_dst <<= c;
while (c--)
m_dst <<= 1;
set_CFB(m_dst);
set_SZPF_Byte(m_dst);
PutbackRMByte(m_dst);
@ -819,7 +821,9 @@ inline void i8086_common_cpu_device::SHL_BYTE(UINT8 c)
inline void i8086_common_cpu_device::SHL_WORD(UINT8 c)
{
m_dst <<= c;
while (c--)
m_dst <<= 1;
set_CFW(m_dst);
set_SZPF_Word(m_dst);
PutbackRMWord(m_dst);
@ -827,36 +831,48 @@ inline void i8086_common_cpu_device::SHL_WORD(UINT8 c)
inline void i8086_common_cpu_device::SHR_BYTE(UINT8 c)
{
m_dst >>= c-1;
m_CarryVal = m_dst & 0x1;
m_dst >>= 1;
while (c--)
{
m_CarryVal = m_dst & 0x01;
m_dst >>= 1;
}
set_SZPF_Byte(m_dst);
PutbackRMByte(m_dst);
}
inline void i8086_common_cpu_device::SHR_WORD(UINT8 c)
{
m_dst >>= c-1;
m_CarryVal = m_dst & 0x1;
m_dst >>= 1;
while (c--)
{
m_CarryVal = m_dst & 0x01;
m_dst >>= 1;
}
set_SZPF_Word(m_dst);
PutbackRMWord(m_dst);
}
inline void i8086_common_cpu_device::SHRA_BYTE(UINT8 c)
{
m_dst = ((INT8)m_dst) >> (c-1);
m_CarryVal = m_dst & 0x1;
m_dst = m_dst >> 1;
while (c--)
{
m_CarryVal = m_dst & 0x01;
m_dst = ((INT8) m_dst) >> 1;
}
set_SZPF_Byte(m_dst);
PutbackRMByte(m_dst);
}
inline void i8086_common_cpu_device::SHRA_WORD(UINT8 c)
{
m_dst = ((INT16)m_dst) >> (c-1);
m_CarryVal = m_dst & 0x1;
m_dst = m_dst >> 1;
while (c--)
{
m_CarryVal = m_dst & 0x01;
m_dst = ((INT16) m_dst) >> 1;
}
set_SZPF_Word(m_dst);
PutbackRMWord(m_dst);
}