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VarAction2: Add last_value variants of JZ/JNZ ops

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This commit is contained in:
Jonathan G Rennison
2022-07-30 23:32:23 +01:00
parent cbc6199542
commit 9a4c31b0da
3 changed files with 37 additions and 20 deletions
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10
src/newgrf.cpp
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@@ -7694,6 +7694,16 @@ static void OptimiseVarAction2DeterministicSpriteGroupInsertJumps(DeterministicS
group->adjusts.erase(group->adjusts.begin() + j);
j--;
i--;
} else if (current.type == DSGA_TYPE_NONE && current.shift_num == 0 && current.and_mask == 0xFFFFFFFF &&
prev.operation == DSGA_OP_STO && prev.variable == 0x1A && prev.shift_num == 0 && prev.and_mask == (current.parameter & 0xFF)) {
/* Reading from immediately prior store, which can now be removed */
current.operation = (current.operation == DSGA_OP_JNZ) ? DSGA_OP_JNZ_LV : DSGA_OP_JZ_LV;
current.adjust_flags &= ~DSGAF_LAST_VAR_READ;
current.and_mask = 0;
current.variable = 0x1A;
group->adjusts.erase(group->adjusts.begin() + j);
j--;
i--;
}
}
group->adjusts.insert(group->adjusts.begin() + j + 1, current);