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VarAction2: Track temp store loads with respect to stores

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This commit is contained in:
Jonathan G Rennison
2022-05-29 03:30:38 +01:00
parent 862d955320
commit 762cfb3df7
1 changed files with 35 additions and 0 deletions
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35
src/newgrf.cpp
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@@ -5560,9 +5560,15 @@ enum VarAction2AdjustInferenceFlags {
};
DECLARE_ENUM_AS_BIT_SET(VarAction2AdjustInferenceFlags)
struct VarAction2TempStoreInference {
VarAction2AdjustInferenceFlags inference = VA2AIF_NONE;
uint32 store_constant = 0;
};
struct VarAction2OptimiseState {
VarAction2AdjustInferenceFlags inference = VA2AIF_NONE;
uint32 current_constant = 0;
btree::btree_map<uint8, VarAction2TempStoreInference> temp_stores;
};
static void OptimiseVarAction2Adjust(VarAction2OptimiseState &state, const GrfSpecFeature feature, const byte varsize, DeterministicSpriteGroup *group, DeterministicSpriteGroupAdjust &adjust)
@@ -5617,6 +5623,30 @@ static void OptimiseVarAction2Adjust(VarAction2OptimiseState &state, const GrfSp
state.current_constant = constant;
};
auto handle_unpredictable_temp_load = [&]() {
};
auto reset_store_values = [&]() {
for (auto &it : state.temp_stores) {
it.second.inference = VA2AIF_NONE;
}
};
auto handle_unpredictable_temp_store = [&]() {
reset_store_values();
};
if (adjust.variable == 0x7B && adjust.parameter == 0x7D) handle_unpredictable_temp_load();
if (adjust.variable == 0x7D && adjust.parameter < 0x100) {
auto iter = state.temp_stores.find(adjust.parameter);
if (iter == state.temp_stores.end()) {
/* Read without any previous store */
} else {
const VarAction2TempStoreInference &store = iter->second;
if (store.inference & VA2AIF_HAVE_CONSTANT) {
adjust.variable = 0x1A;
adjust.and_mask &= (store.store_constant >> adjust.shift_num);
}
}
}
if ((prev_inference & VA2AIF_PREV_TERNARY) && adjust.variable == 0x1A && IsEvalAdjustUsableForConstantPropagation(adjust.operation)) {
/* Propagate constant operation back into previous ternary */
DeterministicSpriteGroupAdjust &prev = group->adjusts[group->adjusts.size() - 2];
@@ -5629,6 +5659,8 @@ static void OptimiseVarAction2Adjust(VarAction2OptimiseState &state, const GrfSp
replace_with_constant_load(EvaluateDeterministicSpriteGroupAdjust(group->size, adjust, nullptr, state.current_constant, UINT_MAX));
} else if (adjust.variable == 0x7E || adjust.type != DSGA_TYPE_NONE) {
/* Procedure call or complex adjustment */
if (adjust.operation == DSGA_OP_STO) handle_unpredictable_temp_store();
if (adjust.variable == 0x7E) reset_store_values();
} else if (group->adjusts.size() > 1) {
/* Not the first adjustment */
if (adjust.and_mask == 0 && IsEvalAdjustWithZeroRemovable(adjust.operation)) {
@@ -5809,6 +5841,9 @@ static void OptimiseVarAction2Adjust(VarAction2OptimiseState &state, const GrfSp
state.inference = prev_inference & (~VA2AIF_PREV_MASK);
if (adjust.variable == 0x1A && adjust.shift_num == 0) {
state.inference |= VA2AIF_PREV_STORE_TMP;
if (adjust.and_mask < 0x100) state.temp_stores[adjust.and_mask] = { prev_inference & (~VA2AIF_PREV_MASK), state.current_constant };
} else {
handle_unpredictable_temp_store();
}
break;
case DSGA_OP_RST: