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VarAction2: Optimise OR followed by XOR of same constant

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Jonathan G Rennison
2022-06-06 22:17:14 +01:00
parent 3aa0ccb97b
commit 26dd84f931
1 changed files with 25 additions and 17 deletions
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10
src/newgrf.cpp
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@@ -6066,8 +6066,9 @@ static void OptimiseVarAction2Adjust(VarAction2OptimiseState &state, const GrfSp
state.inference |= prev_inference & (VA2AIF_SIGNED_NON_NEGATIVE | VA2AIF_ONE_OR_ZERO) & non_const_var_inference;
break;
case DSGA_OP_XOR:
if (adjust.variable == 0x1A && adjust.shift_num == 0 && adjust.and_mask == 1 && group->adjusts.size() >= 2) {
if (adjust.variable == 0x1A && adjust.shift_num == 0 && group->adjusts.size() >= 2) {
DeterministicSpriteGroupAdjust &prev = group->adjusts[group->adjusts.size() - 2];
if (adjust.and_mask == 1) {
if (prev.operation == DSGA_OP_SLT || prev.operation == DSGA_OP_SGE || prev.operation == DSGA_OP_SLE || prev.operation == DSGA_OP_SGT) {
prev.operation = (DeterministicSpriteGroupAdjustOperation)(prev.operation ^ 1);
group->adjusts.pop_back();
@@ -6089,6 +6090,13 @@ static void OptimiseVarAction2Adjust(VarAction2OptimiseState &state, const GrfSp
break;
}
}
if (prev.operation == DSGA_OP_OR && prev.type == DSGA_TYPE_NONE && prev.variable == 0x1A && prev.shift_num == 0 && prev.and_mask == adjust.and_mask) {
prev.operation = DSGA_OP_AND;
prev.and_mask = ~prev.and_mask;
group->adjusts.pop_back();
break;
}
}
if (adjust.and_mask <= 1) state.inference = prev_inference & (VA2AIF_SIGNED_NON_NEGATIVE | VA2AIF_ONE_OR_ZERO);
state.inference |= prev_inference & (VA2AIF_SIGNED_NON_NEGATIVE | VA2AIF_ONE_OR_ZERO) & non_const_var_inference;
break;