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block_of_code: Reduce jmps in dispatcher loop

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This commit is contained in:
MerryMage 2020-04-07 19:28:32 +01:00
parent 7e0c415473
commit f569d7913c
1 changed files with 25 additions and 30 deletions
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51
src/backend/x64/block_of_code.cpp
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@ -195,22 +195,34 @@ void BlockOfCode::GenRunCode() {
// Dispatcher loop
L(enter_mxcsr_then_loop);
SwitchMxcsrOnEntry();
L(loop);
Xbyak::Label return_to_caller, return_to_caller_mxcsr_already_exited;
align();
return_from_run_code[0] = getCurr<const void*>();
cmp(qword[r15 + jsi.offsetof_cycles_remaining], 0);
jng(return_to_caller);
cb.LookupBlock->EmitCall(*this);
jmp(ABI_RETURN);
// Return from run code variants
const auto emit_return_from_run_code = [this, &loop, &enter_mxcsr_then_loop](bool mxcsr_already_exited, bool force_return){
if (!force_return) {
cmp(qword[r15 + jsi.offsetof_cycles_remaining], 0);
jg(mxcsr_already_exited ? enter_mxcsr_then_loop : loop);
}
align();
return_from_run_code[MXCSR_ALREADY_EXITED] = getCurr<const void*>();
cmp(qword[r15 + jsi.offsetof_cycles_remaining], 0);
jng(return_to_caller_mxcsr_already_exited);
SwitchMxcsrOnEntry();
cb.LookupBlock->EmitCall(*this);
jmp(ABI_RETURN);
align();
return_from_run_code[FORCE_RETURN] = getCurr<const void*>();
L(return_to_caller);
if (!mxcsr_already_exited) {
SwitchMxcsrOnExit();
}
// fallthrough
return_from_run_code[MXCSR_ALREADY_EXITED | FORCE_RETURN] = getCurr<const void*>();
L(return_to_caller_mxcsr_already_exited);
cb.AddTicks->EmitCall(*this, [this](RegList param) {
mov(param[0], qword[r15 + jsi.offsetof_cycles_to_run]);
@ -219,23 +231,6 @@ void BlockOfCode::GenRunCode() {
ABI_PopCalleeSaveRegistersAndAdjustStack(*this);
ret();
};
align();
return_from_run_code[0] = getCurr<const void*>();
emit_return_from_run_code(false, false);
align();
return_from_run_code[MXCSR_ALREADY_EXITED] = getCurr<const void*>();
emit_return_from_run_code(true, false);
align();
return_from_run_code[FORCE_RETURN] = getCurr<const void*>();
emit_return_from_run_code(false, true);
align();
return_from_run_code[MXCSR_ALREADY_EXITED | FORCE_RETURN] = getCurr<const void*>();
emit_return_from_run_code(true, true);
PerfMapRegister(run_code, getCurr(), "dynarmic_dispatcher");
}