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Lightweight putllc() for non-TSX if no data changed

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This replaces the totally messed up PR #6728

Some games make heavy use of getllar() & putllc() without even changing data.
In this case avoid unneccesary heavy locking of the PPU threads on non-TSX
hosts.
This commit is contained in:
Markus Stockhausen 2019-11-01 12:47:29 +01:00 • committed by Ivan
parent 223d1473b0
commit cd6b6c8a4f
1 changed files with 26 additions and 18 deletions
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10
rpcs3/Emu/Cell/SPUThread.cpp
View file

@ -1942,7 +1942,14 @@ bool spu_thread::process_mfc_cmd()
} }
} }
} }
else if (auto& data = vm::_ref<decltype(rdata)>(addr); rtime == (vm::reservation_acquire(raddr, 128) & -128) && cmp_rdata(rdata, data)) else if (auto& data = vm::_ref<decltype(rdata)>(addr); rtime == (vm::reservation_acquire(raddr, 128) & -128))
{
if (cmp_rdata(rdata, to_write))
{
// Writeback of unchanged data. Only check memory change
result = cmp_rdata(rdata, data) && vm::reservation_acquire(raddr, 128).compare_and_swap_test(rtime, rtime + 128);
}
else
{ {
auto& res = vm::reservation_lock(raddr, 128); auto& res = vm::reservation_lock(raddr, 128);
const u64 old_time = res.load() & -128; const u64 old_time = res.load() & -128;
@ -1972,6 +1979,7 @@ bool spu_thread::process_mfc_cmd()
} }
} }
} }
}
if (result) if (result)
{ {