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block_of_code: Move MXCSR switching out of dispatch loop

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Also clarify MXCSR entry/exit terminology
This commit is contained in:
MerryMage 2017-12-03 15:22:49 +00:00
parent 2a818f9d8e
commit eb80aae9c0
3 changed files with 21 additions and 20 deletions
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33
src/backend_x64/block_of_code.cpp
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@ -85,22 +85,22 @@ void BlockOfCode::RunCode(JitState* jit_state, size_t cycles_to_run) const {
run_code(jit_state);
}
void BlockOfCode::ReturnFromRunCode(bool MXCSR_switch) {
void BlockOfCode::ReturnFromRunCode(bool mxcsr_already_exited) {
size_t index = 0;
if (!MXCSR_switch)
index |= NO_SWITCH_MXCSR;
if (mxcsr_already_exited)
index |= MXCSR_ALREADY_EXITED;
jmp(return_from_run_code[index]);
}
void BlockOfCode::ForceReturnFromRunCode(bool MXCSR_switch) {
void BlockOfCode::ForceReturnFromRunCode(bool mxcsr_already_exited) {
size_t index = FORCE_RETURN;
if (!MXCSR_switch)
index |= NO_SWITCH_MXCSR;
if (mxcsr_already_exited)
index |= MXCSR_ALREADY_EXITED;
jmp(return_from_run_code[index]);
}
void BlockOfCode::GenRunCode() {
Xbyak::Label loop;
Xbyak::Label loop, enter_mxcsr_then_loop;
align();
run_code = getCurr<RunCodeFuncType>();
@ -119,22 +119,23 @@ void BlockOfCode::GenRunCode() {
mov(r15, ABI_PARAM1);
L(enter_mxcsr_then_loop);
SwitchMxcsrOnEntry();
L(loop);
mov(ABI_PARAM1, u64(lookup_block_arg));
CallFunction(lookup_block);
SwitchMxcsrOnEntry();
jmp(ABI_RETURN);
// Return from run code variants
const auto emit_return_from_run_code = [this, &loop](bool no_mxcsr_switch, bool force_return){
if (!no_mxcsr_switch) {
SwitchMxcsrOnExit();
}
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 + offsetof(JitState, cycles_remaining)], 0);
jg(loop);
jg(mxcsr_already_exited ? enter_mxcsr_then_loop : loop);
}
if (!mxcsr_already_exited) {
SwitchMxcsrOnExit();
}
mov(ABI_PARAM1, qword[r15 + offsetof(JitState, cycles_to_run)]);
@ -150,7 +151,7 @@ void BlockOfCode::GenRunCode() {
emit_return_from_run_code(false, false);
align();
return_from_run_code[NO_SWITCH_MXCSR] = getCurr<const void*>();
return_from_run_code[MXCSR_ALREADY_EXITED] = getCurr<const void*>();
emit_return_from_run_code(true, false);
align();
@ -158,7 +159,7 @@ void BlockOfCode::GenRunCode() {
emit_return_from_run_code(false, true);
align();
return_from_run_code[NO_SWITCH_MXCSR | FORCE_RETURN] = getCurr<const void*>();
return_from_run_code[MXCSR_ALREADY_EXITED | FORCE_RETURN] = getCurr<const void*>();
emit_return_from_run_code(true, true);
}