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VarAction2: Handle case where expensive vars are only conditionally read

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Within a JZ_LV and in prior DSGAF_SKIP_ON_ZERO op
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Jonathan G Rennison 2022-07-31 00:16:40 +01:00
parent 9a4c31b0da
commit 7af568f0f0
1 changed files with 19 additions and 4 deletions
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23
src/newgrf.cpp
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@ -7336,12 +7336,17 @@ static bool OptimiseVarAction2DeterministicSpriteGroupExpensiveVarsInner(Determi
uint32 and_mask = 0;
uint condition_depth = 0;
bool seen_first = false;
int last_unused_jump = -1;
for (int j = end; j >= start; j--) {
DeterministicSpriteGroupAdjust &adjust = group->adjusts[j];
if (seen_first && IsEvalAdjustJumpOperation(adjust.operation) && condition_depth > 0) {
/* Do not insert the STO_NC inside a conditional block when it is also needed outside the block */
condition_depth--;
insert_pos = j;
if (seen_first && IsEvalAdjustJumpOperation(adjust.operation)) {
if (condition_depth > 0) {
/* Do not insert the STO_NC inside a conditional block when it is also needed outside the block */
condition_depth--;
insert_pos = j;
} else {
last_unused_jump = j;
}
}
if (seen_first && adjust.adjust_flags & DSGAF_END_BLOCK) condition_depth += adjust.jump;
if (adjust.variable == target_var && adjust.parameter == target_param) {
@ -7360,6 +7365,16 @@ static bool OptimiseVarAction2DeterministicSpriteGroupExpensiveVarsInner(Determi
load.parameter = target_param;
load.and_mask = and_mask;
load.divmod_val = bit;
if (group->adjusts[insert_pos].adjust_flags & DSGAF_SKIP_ON_ZERO) {
for (int j = insert_pos + 1; j <= end; j++) {
if (group->adjusts[j].adjust_flags & DSGAF_SKIP_ON_ZERO) continue;
if (group->adjusts[j].operation == DSGA_OP_JZ_LV && last_unused_jump == j) {
/* The variable is never actually read if last_value is 0 at this point */
load.adjust_flags |= DSGAF_SKIP_ON_ZERO;
}
break;
}
}
group->adjusts.insert(group->adjusts.begin() + insert_pos, load);
};