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VarAction2: Apply XOR bool inversion conversions after DSE

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Jonathan G Rennison
2022-06-08 18:06:38 +01:00
parent 2bbfa37730
commit b95116e4fc
1 changed files with 14 additions and 0 deletions
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14
src/newgrf.cpp
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@@ -6936,6 +6936,20 @@ static std::bitset<256> HandleVarAction2DeadStoreElimination(DeterministicSprite
break;
}
}
} else if (i >= 0 && i + 1 < (int)group->adjusts.size()) {
/* See if having removed the store, there is now a useful pair of operations which can be combined */
DeterministicSpriteGroupAdjust &prev = group->adjusts[i];
DeterministicSpriteGroupAdjust &next = group->adjusts[i + 1];
if (next.type == DSGA_TYPE_NONE && next.operation == DSGA_OP_XOR && next.variable == 0x1A && next.shift_num == 0 && next.and_mask == 1) {
/* XOR: boolean invert */
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);
erase_adjust(i + 1);
} else if (prev.operation == DSGA_OP_RST && (prev.type == DSGA_TYPE_EQ || prev.type == DSGA_TYPE_NEQ)) {
prev.type = (prev.type == DSGA_TYPE_EQ) ? DSGA_TYPE_NEQ : DSGA_TYPE_EQ;
erase_adjust(i + 1);
}
}
}
if (pending_restart) restart();
continue;