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VarAction2: Optimise OR which always produces 1

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Jonathan G Rennison
2022-06-06 22:17:14 +01:00
parent 9b0a7ac85e
commit 3aa0ccb97b
1 changed files with 4 additions and 0 deletions
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4
src/newgrf.cpp
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@@ -6058,6 +6058,10 @@ static void OptimiseVarAction2Adjust(VarAction2OptimiseState &state, const GrfSp
state.inference |= non_const_var_inference; state.inference |= non_const_var_inference;
break; break;
case DSGA_OP_OR: case DSGA_OP_OR:
if (adjust.variable == 0x1A && adjust.shift_num == 0 && adjust.and_mask == 1 && (prev_inference & VA2AIF_ONE_OR_ZERO)) {
replace_with_constant_load(1);
break;
}
if (adjust.and_mask <= 1) state.inference = prev_inference & (VA2AIF_SIGNED_NON_NEGATIVE | VA2AIF_ONE_OR_ZERO); 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; state.inference |= prev_inference & (VA2AIF_SIGNED_NON_NEGATIVE | VA2AIF_ONE_OR_ZERO) & non_const_var_inference;
break; break;