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[dynarmic] Make SetX/GetW pairs optimized by getSet pass 

this results in removed reloads for any code that uses those heavily :)

Signed-off-by: lizzie <lizzie@eden-emu.dev>
This commit is contained in:
lizzie 2026-02-10 10:55:06 +00:00
parent a8093c2a3c
commit 27f349bc32
1 changed files with 7 additions and 15 deletions
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22
src/dynarmic/src/dynarmic/ir/opt_passes.cpp
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@ -520,27 +520,19 @@ static void A64GetSetElimination(IR::Block& block) {
info.set_instruction_present = true;
info.last_set_instruction = set_inst;
};
const auto do_get = [](RegisterInfo& info, Iterator get_inst, TrackingType tracking_type) {
const auto do_nothing = [&] {
// A sequence like
// SetX r1 -> GetW r1, is just reading off the lowest 32-bits of the register
auto const is_lower_32 = tracking_type == TrackingType::W
&& info.tracking_type == TrackingType::X;
if (!info.register_value.IsEmpty() && (is_lower_32 || info.tracking_type == tracking_type)) {
get_inst->ReplaceUsesWith(info.register_value);
} else {
info = {};
info.register_value = IR::Value(&*get_inst);
info.tracking_type = tracking_type;
};
if (info.register_value.IsEmpty()) {
do_nothing();
return;
}
if (info.tracking_type == tracking_type) {
get_inst->ReplaceUsesWith(info.register_value);
return;
}
do_nothing();
};
for (auto inst = block.instructions.begin(); inst != block.instructions.end(); ++inst) {
auto const opcode = inst->GetOpcode();
switch (opcode) {