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VarAction2: Remove redundant UMIN operation on already boolean values

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This commit is contained in:
Jonathan G Rennison 2022-06-01 23:01:50 +01:00
parent 3c9201ebd5
commit d8f9641dc9
1 changed files with 10 additions and 1 deletions
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11
src/newgrf.cpp
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@ -5837,7 +5837,16 @@ static void OptimiseVarAction2Adjust(VarAction2OptimiseState &state, const GrfSp
}
break;
case DSGA_OP_UMIN:
if (adjust.and_mask <= 1) state.inference = VA2AIF_SIGNED_NON_NEGATIVE | VA2AIF_ONE_OR_ZERO;
if (adjust.and_mask == 1) {
if (prev_inference & VA2AIF_ONE_OR_ZERO) {
/* Delete useless bool -> bool conversion */
group->adjusts.pop_back();
state.inference = prev_inference;
break;
} else {
state.inference = VA2AIF_SIGNED_NON_NEGATIVE | VA2AIF_ONE_OR_ZERO;
}
}
break;
case DSGA_OP_AND:
if ((prev_inference & VA2AIF_PREV_MASK_ADJUST) && adjust.variable == 0x1A && adjust.shift_num == 0) {