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VarAction2: Avoid marking a duplicate store as a clone of itself

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This commit is contained in:
Jonathan G Rennison
2022-10-05 18:13:07 +01:00
parent 9e95b3d807
commit 311b4ebe9d
1 changed files with 17 additions and 2 deletions
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19
src/newgrf_optimiser.cpp
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@@ -1453,6 +1453,19 @@ void OptimiseVarAction2Adjust(VarAction2OptimiseState &state, const GrfSpecFeatu
if (adjust.variable == 0x1A && adjust.shift_num == 0) {
state.inference |= VA2AIF_PREV_STORE_TMP;
if (adjust.and_mask < 0x100) {
bool invert_store = false;
const DeterministicSpriteGroupAdjust *prev_store = get_prev_single_store((prev_inference & VA2AIF_ONE_OR_ZERO) ? &invert_store : nullptr);
if (prev_store != nullptr && prev_store->and_mask == adjust.and_mask) {
if (invert_store) {
/* Inverted store of self, don't try to handle this */
invert_store = false;
prev_store = nullptr;
} else {
/* Duplicate store, don't make any changes */
break;
}
}
for (auto &it : state.temp_stores) {
/* Check if some other variable is marked as a copy of the one we are overwriting */
if ((it.second.inference & VA2AIF_SINGLE_LOAD) && it.second.var_source.variable == 0x7D && (it.second.var_source.parameter & 0xFF) == adjust.and_mask) {
@@ -1470,8 +1483,6 @@ void OptimiseVarAction2Adjust(VarAction2OptimiseState &state, const GrfSpecFeatu
store.inference = prev_inference & (~VA2AIF_PREV_MASK);
store.store_constant = state.current_constant;
bool invert_store = false;
const DeterministicSpriteGroupAdjust *prev_store = get_prev_single_store((prev_inference & VA2AIF_ONE_OR_ZERO) ? &invert_store : nullptr);
if (prev_store != nullptr) {
/* This store is a clone of the previous store, or inverted clone of the previous store (bool) */
store.inference |= VA2AIF_SINGLE_LOAD;
@@ -1489,6 +1500,10 @@ void OptimiseVarAction2Adjust(VarAction2OptimiseState &state, const GrfSpecFeatu
bool invert = false;
const DeterministicSpriteGroupAdjust *prev_load = get_prev_single_load(&invert);
if (prev_load != nullptr && (!invert || IsConstantComparisonAdjustType(prev_load->type))) {
if (prev_load->variable == 0x7D && (prev_load->parameter & 0xFF) == adjust.and_mask) {
/* Store to same variable as previous load, do not mark store as clone of itself */
break;
}
store.inference |= VA2AIF_SINGLE_LOAD;
store.var_source.type = prev_load->type;
if (invert) store.var_source.type = InvertConstantComparisonAdjustType(store.var_source.type);