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Add re-entry prediction to avoid std::unordered_map lookups

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This commit is contained in:
MerryMage 2017-12-12 14:18:21 +00:00
parent 5c6fcf378f
commit 6e834de072
4 changed files with 24 additions and 1 deletions
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17
src/backend_x64/block_of_code.cpp
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@ -82,7 +82,14 @@ void BlockOfCode::RunCode(JitState* jit_state, size_t cycles_to_run) const {
jit_state->cycles_to_run = cycles_to_run;
jit_state->cycles_remaining = cycles_to_run;
run_code(jit_state);
u32 new_rsb_ptr = (jit_state->rsb_ptr - 1) & JitState::RSBPtrMask;
if (jit_state->GetUniqueHash() == jit_state->rsb_location_descriptors[new_rsb_ptr]) {
jit_state->rsb_ptr = new_rsb_ptr;
run_code_from(jit_state, jit_state->rsb_codeptrs[new_rsb_ptr]);
} else {
run_code(jit_state);
}
}
void BlockOfCode::ReturnFromRunCode(bool mxcsr_already_exited) {
@ -102,6 +109,14 @@ void BlockOfCode::ForceReturnFromRunCode(bool mxcsr_already_exited) {
void BlockOfCode::GenRunCode() {
Xbyak::Label loop, enter_mxcsr_then_loop;
align();
run_code_from = getCurr<RunCodeFromFuncType>();
ABI_PushCalleeSaveRegistersAndAdjustStack(this);
mov(r15, ABI_PARAM1);
SwitchMxcsrOnEntry();
jmp(ABI_PARAM2);
align();
run_code = getCurr<RunCodeFuncType>();