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divtlb.cpp: strore address of elemtnt 0 of m_table and return it in vtlb_table, with this in debug mode i386 is 1.7 times faster (nw)

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This commit is contained in:
yz70s 2016-08-21 17:52:47 +02:00
parent 649c13736c
commit 4df54c9986
2 changed files with 6 additions and 2 deletions
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7
src/emu/divtlb.cpp
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@ -36,7 +36,8 @@ device_vtlb_interface::device_vtlb_interface(const machine_config &mconfig, devi
m_fixed(0),
m_dynindex(0),
m_pageshift(0),
m_addrwidth(0)
m_addrwidth(0),
m_table_base(nullptr)
{
}
@ -92,6 +93,8 @@ void device_vtlb_interface::interface_pre_start()
// allocate the lookup table
m_table.resize((size_t) 1 << (m_addrwidth - m_pageshift));
memset(&m_table[0], 0, m_table.size()*sizeof(m_table[0]));
// pointer to first element for quick access
m_table_base = &m_table[0];
// allocate the fixed page count array
if (m_fixed > 0)
@ -336,5 +339,5 @@ void device_vtlb_interface::vtlb_flush_address(offs_t address)
const vtlb_entry *device_vtlb_interface::vtlb_table() const
{
return &m_table[0];
return m_table_base;
}

1
src/emu/divtlb.h
View File

@ -83,6 +83,7 @@ private:
std::vector<offs_t> m_live; // array of live entries by table index
std::vector<int> m_fixedpages; // number of pages each fixed entry covers
std::vector<vtlb_entry> m_table; // table of entries by address
vtlb_entry *m_table_base; // pointer to m_table[0]
};