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TSX: new fallback method (time-based)

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Basically, using timestamp counter.
Rewritten vm::reservation_op with the same principle.
Rewritten another transaction helper.
Add two new settings for configuring fallbacks.
Two limits are specified in nanoseconds (first and second).
Fix PUTLLC reload logic (prevent reusing garbage).
This commit is contained in:
Nekotekina 2020-10-31 01:52:24 +03:00
parent 80530e8aef
commit 86fc842c89
12 changed files with 263 additions and 79 deletions
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53
Utilities/JIT.h
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@ -57,31 +57,68 @@ namespace asmjit
// Emit xbegin and adjacent loop, return label at xbegin (don't use xabort please)
template <typename F>
[[nodiscard]] inline asmjit::Label build_transaction_enter(asmjit::X86Assembler& c, asmjit::Label fallback, const asmjit::X86Gp& ctr, uint less_than, F func)
[[nodiscard]] inline asmjit::Label build_transaction_enter(asmjit::X86Assembler& c, asmjit::Label fallback, F func)
{
Label fall = c.newLabel();
Label begin = c.newLabel();
c.jmp(begin);
c.bind(fall);
// First invoked after failure
func();
c.add(ctr, 1);
// Don't repeat on zero status (may indicate syscall or interrupt)
c.test(x86::eax, x86::eax);
c.jz(fallback);
// First invoked after failure (can fallback to proceed, or jump anywhere else)
func();
// Other bad statuses are ignored regardless of repeat flag (TODO)
c.cmp(ctr, less_than);
c.jae(fallback);
c.align(kAlignCode, 16);
c.bind(begin);
return fall;
// xbegin should be issued manually, allows to add more check before entering transaction
}
// Helper to spill RDX (EDX) register for RDTSC
inline void build_swap_rdx_with(asmjit::X86Assembler& c, std::array<X86Gp, 4>& args, const asmjit::X86Gp& with)
{
#ifdef _WIN32
c.xchg(args[1], with);
args[1] = with;
#else
c.xchg(args[2], with);
args[2] = with;
#endif
}
// Get full RDTSC value into chosen register (clobbers rax/rdx or saves only rax with other target)
inline void build_get_tsc(asmjit::X86Assembler& c, const asmjit::X86Gp& to = asmjit::x86::rax)
{
if (&to != &x86::rax && &to != &x86::rdx)
{
// Swap to save its contents
c.xchg(x86::rax, to);
}
c.rdtsc();
c.shl(x86::rdx, 32);
if (&to == &x86::rax)
{
c.or_(x86::rax, x86::rdx);
}
else if (&to == &x86::rdx)
{
c.or_(x86::rdx, x86::rax);
}
else
{
// Swap back, maybe there is more effective way to do it
c.xchg(x86::rax, to);
c.mov(to.r32(), to.r32());
c.or_(to.r64(), x86::rdx);
}
}
}
// Build runtime function with asmjit::X86Assembler