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3x 9x 120x 47x 9x 38x 38x 1x 1x 37x 3x 34x 120x 1x 1x 2x 1x 120x 54x 54x 91x 91x 91x 54x 147x 2x 145x 68x 68x 10x 77x 11x 21x 66x 41x 41x 25x 1x 54x 54x 120x 86x 120x 17x 53x 10x 43x 2x 2x 2x 2x 41x 120x 1x 2x 1x 1x 1x 120x 335x 82x 253x 156x 97x 3x 94x 120x 293x 7x 293x 120x 479x 27x 27x 452x 22x 1x 1x 1x 1x 1x 1x 1x 1x 1x 21x 21x 21x 21x 21x 21x 21x 15x 6x 6x 21x 21x 21x 430x 92x 92x 92x 92x 92x 338x 4x 334x 2x 2x 2x 332x 2x 330x 330x 1x 329x 4x 4x 4x 325x 452x 120x 174x 18x 36x 34x 34x 2x 2x 18x 18x 18x 120x 1x 120x 90x 120x 120x 1x 120x 16x 120x 17x 120x 16x 120x 120x 484x 484x 484x 1300x 4x 4x 4x 4x 4x 3x 3x 3x 3x 3x 3x 3x 3x 1297x 13x 13x 13x 1x 1x 1x 1x 1x 1296x 1296x 484x | import { wrap8Bit } from "shared/lib/helpers/8bit";
import { assertUnreachable } from "./format";
import tokenize from "shared/lib/rpn/tokenizer";
import shuntingYard from "shared/lib/rpn/shuntingYard";
import {
PrecompiledValueRPNOperation,
PrecompiledValueFetch,
isValueOperation,
ScriptValue,
isUnaryOperation,
ValueOperatorType,
ValueUnaryOperatorType,
isValueUnaryOperatorType,
isScriptValueVariable,
ScriptValueAtom,
OptimisedScriptValue,
ASMStaticScriptValue,
} from "./types";
import { OperatorSymbol, RPNToken } from "shared/lib/rpn/types";
import { subpxShiftForUnits } from "shared/lib/helpers/subpixels";
import { normalizeVariableId } from "shared/lib/variables/variableIds";
const boolToInt = (val: boolean) => (val ? 1 : 0);
const zero = {
type: "number",
value: 0,
} as const;
export const optimiseScriptValue = (
input: ScriptValue,
): OptimisedScriptValue => {
if (isValueOperation(input)) {
const optimisedA = input.valueA ? optimiseScriptValue(input.valueA) : zero;
const optimisedB = input.valueB ? optimiseScriptValue(input.valueB) : zero;
if (optimisedA?.type === "number" && optimisedB?.type === "number") {
// Can perform constant folding as both inputs are numbers
if (input.type === "add") {
return {
type: "number",
value: Math.floor(optimisedA.value + optimisedB.value),
};
} else if (input.type === "sub") {
return {
type: "number",
value: Math.floor(optimisedA.value - optimisedB.value),
};
} else if (input.type === "mul") {
return {
type: "number",
value: Math.floor(optimisedA.value * optimisedB.value),
};
} else if (input.type === "div") {
return {
type: "number",
value: Math.floor(optimisedA.value / optimisedB.value),
};
} else if (input.type === "mod") {
return {
type: "number",
value: Math.floor(optimisedA.value % optimisedB.value),
};
} else if (input.type === "gt") {
return {
type: "number",
value: boolToInt(optimisedA.value > optimisedB.value),
};
} else if (input.type === "gte") {
return {
type: "number",
value: boolToInt(optimisedA.value >= optimisedB.value),
};
} else if (input.type === "lt") {
return {
type: "number",
value: boolToInt(optimisedA.value < optimisedB.value),
};
} else if (input.type === "lte") {
return {
type: "number",
value: boolToInt(optimisedA.value <= optimisedB.value),
};
} else if (input.type === "eq") {
return {
type: "number",
value: boolToInt(optimisedA.value === optimisedB.value),
};
} else if (input.type === "ne") {
return {
type: "number",
value: boolToInt(optimisedA.value !== optimisedB.value),
};
} else if (input.type === "min") {
return {
type: "number",
value: Math.min(optimisedA.value, optimisedB.value),
};
} else if (input.type === "max") {
return {
type: "number",
value: Math.max(optimisedA.value, optimisedB.value),
};
} else if (input.type === "and") {
return {
type: "number",
value: optimisedA.value && optimisedB.value,
};
} else if (input.type === "or") {
return {
type: "number",
value: optimisedA.value || optimisedB.value,
};
} else if (input.type === "shl") {
return {
type: "number",
value: optimisedA.value << optimisedB.value,
};
} else if (input.type === "shr") {
return {
type: "number",
value: optimisedA.value >> optimisedB.value,
};
} else if (input.type === "bAND") {
return {
type: "number",
value: optimisedA.value & optimisedB.value,
};
} else if (input.type === "bOR") {
return {
type: "number",
value: optimisedA.value | optimisedB.value,
};
} else if (input.type === "bXOR") {
return {
type: "number",
value: optimisedA.value ^ optimisedB.value,
};
} else Eif (input.type === "atan2") {
return {
type: "number",
value: Math.floor(
wrap8Bit(
Math.atan2(optimisedA.value, optimisedB.value) * (128 / Math.PI) +
64,
),
),
};
}
/* istanbul ignore next: unreachable */
assertUnreachable(input.type);
}
return {
...input,
valueA: optimisedA,
valueB: optimisedB,
};
}
if (isUnaryOperation(input)) {
const type = input.type;
const optimisedValue = input.value
? optimiseScriptValue(input.value)
: zero;
if (optimisedValue?.type === "number") {
if (type === "not") {
return {
type: "number",
value: boolToInt(!optimisedValue.value),
};
} else if (type === "abs") {
return {
type: "number",
value: Math.floor(Math.abs(optimisedValue.value)),
};
} else if (type === "isqrt") {
return {
type: "number",
value: Math.floor(Math.sqrt(optimisedValue.value)),
};
} else if (type === "bNOT") {
return {
type: "number",
value: ~optimisedValue.value,
};
} else if (type === "rnd") {
return {
type: "rnd",
value: {
type: "number",
value: optimisedValue.value,
},
};
} else Eif (type === "neg") {
return {
type: "number",
value: Math.floor(-optimisedValue.value),
};
}
/* istanbul ignore next: unreachable */
assertUnreachable(type);
}
return {
...input,
value: optimisedValue,
};
} else if (input.type === "expression") {
return optimiseScriptValue(expressionToScriptValue(input.value));
} else if (input.type === "variable" && input.index) {
return {
...input,
index: optimiseScriptValue(input.index),
};
}
return input;
};
const mapOperator = (
operator: OperatorSymbol,
): ValueOperatorType | ValueUnaryOperatorType => {
const operatorMap: Record<
OperatorSymbol,
ValueOperatorType | ValueUnaryOperatorType
> = {
"/": "div",
"*": "mul",
"+": "add",
"-": "sub",
"%": "mod",
"!": "not",
"&": "bAND",
"|": "bOR",
"^": "bXOR",
"~": "bNOT",
"==": "eq",
"!=": "ne",
"<": "lt",
"<=": "lte",
">": "gt",
">=": "gte",
"&&": "and",
"||": "or",
"<<": "shl",
">>": "shr",
neg: "neg",
};
const scriptValueOperator = operatorMap[operator];
/* istanbul ignore else: unreachable else branch */
if (scriptValueOperator) {
return scriptValueOperator;
} else {
assertUnreachable(scriptValueOperator);
return "eq";
}
};
export const rpnTokensToScriptValue = (rpnTokens: RPNToken[]): ScriptValue => {
const stack: ScriptValue[] = [];
for (const operation of rpnTokens) {
if (operation.type === "VAR") {
const variableId = normalizeVariableId(
operation.symbol.replace(/\$/g, ""),
);
stack.push({
type: "variable",
value: variableId,
...(operation.index && {
index: rpnTokensToScriptValue(operation.index),
}),
});
} else if (operation.type === "VAL") {
stack.push({
type: "number",
value: operation.value,
});
} else if (operation.type === "CONST") {
stack.push({
type: "constant",
value: operation.symbol,
});
} else if (operation.type === "OP") {
const scriptValueOperator = mapOperator(operation.operator);
if (isValueUnaryOperatorType(scriptValueOperator)) {
const value = stack.pop();
Eif (value) {
stack.push({
type: scriptValueOperator,
value,
});
}
} else {
const valueB = stack.pop();
const valueA = stack.pop();
Eif (valueA && valueB) {
stack.push({
type: scriptValueOperator,
valueA,
valueB,
});
}
}
} else if (operation.type === "FUN") {
if (operation.function === "min") {
const valueB = stack.pop();
const valueA = stack.pop();
Eif (valueA && valueB) {
stack.push({
type: "min",
valueA,
valueB,
});
}
} else if (operation.function === "max") {
const valueB = stack.pop();
const valueA = stack.pop();
Eif (valueA && valueB) {
stack.push({
type: "max",
valueA,
valueB,
});
}
} else if (operation.function === "abs") {
const value = stack.pop();
Eif (value) {
stack.push({
type: "abs",
value,
});
}
} else if (operation.function === "len") {
const value = stack.pop();
if (isScriptValueVariable(value) && value.index === undefined) {
stack.push({
type: "len",
value: {
type: "variable",
value: value.value,
},
});
} else E{
throw new Error("len() requires an array variable");
}
} else if (operation.function === "rnd") {
const value = stack.pop();
Eif (value) {
stack.push({
type: "rnd",
value,
});
}
} else if (operation.function === "isqrt") {
const value = stack.pop();
Eif (value) {
stack.push({
type: "isqrt",
value,
});
}
} else if (operation.function === "atan2") {
const valueB = stack.pop();
const valueA = stack.pop();
Eif (valueA && valueB) {
stack.push({
type: "atan2",
valueA,
valueB,
});
}
} else Eif (operation.function === "neg") {
const value = stack.pop();
if (value) {
stack.push({
type: "sub",
valueA: { type: "number", value: 0 },
valueB: value,
});
}
} else {
/* istanbul ignore next: unreachable */
assertUnreachable(operation.function);
}
} else E{
/* istanbul ignore next: unreachable */
assertUnreachable(operation);
}
}
Iif (stack.length !== 1) {
throw new Error("Invalid RPN expression");
}
return stack[0];
};
export const expressionToScriptValue = (expression: string): ScriptValue => {
try {
const tokens = tokenize(expression);
const rpnTokens = shuntingYard(tokens);
return rpnTokensToScriptValue(rpnTokens);
} catch {
return zero;
}
};
export const walkScriptValue = (
input: ScriptValue,
fn: (val: ScriptValue) => void,
): void => {
fn(input);
Iif (input.type === "variable" && input.index) {
walkScriptValue(input.index, fn);
}
if ("valueA" in input && input.valueA) {
walkScriptValue(input.valueA, fn);
}
if ("valueB" in input && input.valueB) {
walkScriptValue(input.valueB, fn);
}
if (input.type === "len") {
walkScriptValue(input.value, fn);
}
if ("value" in input && input.value && isUnaryOperation(input)) {
walkScriptValue(input.value, fn);
}
};
// recursively search script value for matching node, stop iterating on first match
export const someInScriptValue = (
input: ScriptValue,
fn: (val: ScriptValue) => boolean,
): boolean => {
const stack: ScriptValue[] = [input];
while (stack.length > 0) {
const currentNode = stack.pop();
Iif (!currentNode) continue;
if (fn(currentNode)) {
return true;
}
if (currentNode.type === "variable" && currentNode.index) {
stack.push(currentNode.index);
} else if ("valueA" in currentNode && "valueB" in currentNode) {
stack.push(currentNode.valueB, currentNode.valueA);
} else Iif (currentNode.type === "len") {
stack.push(currentNode.value);
} else if ("value" in currentNode && isUnaryOperation(currentNode)) {
stack.push(currentNode.value);
}
}
return false;
};
export const mapScriptValue = (
input: ScriptValue,
fn: (val: ScriptValueAtom) => ScriptValueAtom,
): ScriptValue => {
if (isValueOperation(input)) {
return {
...input,
valueA: mapScriptValue(input.valueA, fn),
valueB: mapScriptValue(input.valueB, fn),
};
}
Iif (isUnaryOperation(input)) {
return {
...input,
value: mapScriptValue(input.value, fn),
};
}
if (input.type === "len") {
const value = fn(input.value);
return value.type === "variable" && !("index" in value)
? {
type: "len",
value,
}
: value;
}
if (input.type === "variable" && input.index) {
return fn({
...input,
index: mapScriptValue(input.index, fn),
});
}
return fn(input);
};
export const extractScriptValueActorIds = (input: ScriptValue): string[] => {
const actorIds: string[] = [];
walkScriptValue(input, (val) => {
Iif (val.type === "property" && !actorIds.includes(val.target)) {
actorIds.push(val.target);
}
});
return actorIds;
};
export type ScriptValueVariableUse = {
id: string;
type: "number" | "array";
};
export const extractScriptValueVariableUses = (
input: ScriptValue,
): ScriptValueVariableUse[] => {
const uses: ScriptValueVariableUse[] = [];
const addUse = (id: string, type: ScriptValueVariableUse["type"]) => {
const existingUse = uses.find((use) => use.id === id);
Iif (existingUse) {
if (type === "array") {
existingUse.type = "array";
}
return;
}
uses.push({ id, type });
};
const visit = (value: ScriptValue) => {
if (value.type === "len") {
addUse(value.value.value, "array");
} else if (value.type === "variable") {
addUse(value.value, value.index ? "array" : "number");
if (value.index) {
visit(value.index);
}
} else if (value.type === "expression") {
for (const variable of extractScriptValueVariables(
expressionToScriptValue(value.value),
)) {
addUse(variable, "number");
}
} else if (isValueOperation(value)) {
visit(value.valueA);
visit(value.valueB);
} else if (isUnaryOperation(value)) {
visit(value.value);
}
};
visit(input);
return uses;
};
export const extractScriptValueVariables = (input: ScriptValue): string[] =>
extractScriptValueVariableUses(input).map((use) => use.id);
// recursively search script value for node containing variable, stop iterating on first match
export const variableInScriptValue = (
variable: string,
input: ScriptValue,
): boolean => {
return someInScriptValue(input, (val) => {
if (val.type === "variable" && val.value === variable) {
return true;
} else if (val.type === "expression") {
const text = val.value;
Eif (text && typeof text === "string") {
const expressionValue = expressionToScriptValue(text);
return variableInScriptValue(variable, expressionValue);
}
}
return false;
});
};
export const constantInScriptValue = (
constantId: string,
input: ScriptValue,
): boolean => {
return someInScriptValue(input, (val) => {
if (val.type === "constant" && val.value === constantId) {
return true;
} else Iif (val.type === "expression") {
const text = val.value;
if (text && typeof text === "string") {
const expressionValue = expressionToScriptValue(text);
return constantInScriptValue(constantId, expressionValue);
}
}
return false;
});
};
const isASMStaticScriptValue = (
value: ScriptValue,
): value is ASMStaticScriptValue => {
if (
value.type === "number" ||
value.type === "numberSymbol" ||
value.type === "constant"
) {
return true;
}
if (
value.type === "add" ||
value.type === "sub" ||
value.type === "mul" ||
value.type === "div" ||
value.type === "mod" ||
value.type === "shl" ||
value.type === "shr" ||
value.type === "bAND" ||
value.type === "bOR" ||
value.type === "bXOR"
) {
return (
isASMStaticScriptValue(value.valueA) &&
isASMStaticScriptValue(value.valueB)
);
}
if (value.type === "neg" || value.type === "bNOT") {
return isASMStaticScriptValue(value.value);
}
return false;
};
export type PrecompileScriptValueOptions = {
resolveConstants?: (id: string) => number;
};
export const precompileScriptValue = (
input: ScriptValue,
localsLabel = "",
{ resolveConstants }: PrecompileScriptValueOptions = {},
): [PrecompiledValueRPNOperation[], PrecompiledValueFetch[]] => {
const resolvedInput = resolveConstants
? optimiseScriptValue(
mapScriptValue(input, (node) =>
node.type === "constant"
? {
type: "number",
value: resolveConstants(node.value),
}
: node,
),
)
: undefined;
return precompileOptimisedScriptValue(
resolvedInput?.type === "number"
? resolvedInput
: optimiseScriptValue(input),
localsLabel,
);
};
export const precompileOptimisedScriptValue = (
input: OptimisedScriptValue,
localsLabel = "",
rpnOperations: PrecompiledValueRPNOperation[] = [],
fetchOperations: PrecompiledValueFetch[] = [],
): [PrecompiledValueRPNOperation[], PrecompiledValueFetch[]] => {
if (
(isValueOperation(input) || isUnaryOperation(input)) &&
isASMStaticScriptValue(input)
) {
rpnOperations.push({
type: "asmExpression",
value: input,
});
return [peepholeRPN(rpnOperations), fetchOperations];
}
if (input.type === "property") {
if (input.target === "camera") {
const positionPropertiesX = ["xpos", "pxpos", "spxpos"];
const positionPropertiesY = ["ypos", "pypos", "spypos"];
const positionProperties = [
...positionPropertiesX,
...positionPropertiesY,
];
if (positionProperties.includes(input.property)) {
if (positionPropertiesX.includes(input.property)) {
rpnOperations.push({
type: "memI16",
value: "camera_x",
});
} else Eif (positionPropertiesY.includes(input.property)) {
rpnOperations.push({
type: "memI16",
value: "camera_y",
});
}
if (input.property === "xpos" || input.property === "ypos") {
rpnOperations.push({
type: "number",
value: subpxShiftForUnits("tiles"),
});
rpnOperations.push({
type: "shr",
});
} else Eif (input.property === "pxpos" || input.property === "pypos") {
rpnOperations.push({
type: "number",
value: subpxShiftForUnits("pixels"),
});
rpnOperations.push({
type: "shr",
});
}
} else Eif (input.property === "xdeadzone") {
rpnOperations.push({
type: "memI8",
value: "camera_deadzone_x",
});
} else if (input.property === "ydeadzone") {
rpnOperations.push({
type: "memI8",
value: "camera_deadzone_y",
});
} else if (input.property === "xoffset") {
rpnOperations.push({
type: "memI8",
value: "camera_offset_x",
});
} else if (input.property === "yoffset") {
rpnOperations.push({
type: "memI8",
value: "camera_offset_y",
});
} else if (input.property === "xscroll") {
rpnOperations.push({
type: "memI16",
value: "scroll_x",
});
} else if (input.property === "yscroll") {
rpnOperations.push({
type: "memI16",
value: "scroll_y",
});
} else {
throw new Error(`Unsupported property type "${input.property}"`);
}
} else {
const localName = `local_${localsLabel}${fetchOperations.length}`;
const positionPropertiesX = ["xpos", "pxpos", "spxpos"];
const positionPropertiesY = ["ypos", "pypos", "spypos"];
const positionProperties = [
...positionPropertiesX,
...positionPropertiesY,
];
if (positionProperties.includes(input.property)) {
fetchOperations.push({
local: localName,
value: {
type: "actorPosition",
target: input.target,
},
});
if (positionPropertiesX.includes(input.property)) {
rpnOperations.push({
type: "local",
value: localName,
offset: 1,
});
} else Eif (positionPropertiesY.includes(input.property)) {
rpnOperations.push({
type: "local",
value: localName,
offset: 2,
});
}
if (input.property === "xpos" || input.property === "ypos") {
rpnOperations.push({
type: "number",
value: subpxShiftForUnits("tiles"),
});
rpnOperations.push({
type: "shr",
});
} else Eif (input.property === "pxpos" || input.property === "pypos") {
rpnOperations.push({
type: "number",
value: subpxShiftForUnits("pixels"),
});
rpnOperations.push({
type: "shr",
});
}
} else Eif (input.property === "direction") {
fetchOperations.push({
local: localName,
value: {
type: "actorDirection",
target: input.target,
},
});
rpnOperations.push({
type: "local",
value: localName,
});
} else if (input.property === "frame") {
fetchOperations.push({
local: localName,
value: {
type: "actorFrame",
target: input.target,
},
});
rpnOperations.push({
type: "local",
value: localName,
offset: 1,
});
} else {
throw new Error(`Unsupported property type "${input.property}"`);
}
}
} else if (isValueOperation(input)) {
Eif (input.valueA) {
precompileOptimisedScriptValue(
input.valueA,
localsLabel,
rpnOperations,
fetchOperations,
);
}
Eif (input.valueB) {
precompileOptimisedScriptValue(
input.valueB,
localsLabel,
rpnOperations,
fetchOperations,
);
}
rpnOperations.push({
type: input.type,
});
} else if (input.type === "len") {
rpnOperations.push({
type: "len",
value: input.value.value,
});
} else if (isUnaryOperation(input)) {
Eif (input.value) {
precompileOptimisedScriptValue(
input.value,
localsLabel,
rpnOperations,
fetchOperations,
);
}
rpnOperations.push({
type: input.type,
});
} else if (input.type === "true") {
rpnOperations.push({ type: "number", value: 1 });
} else Iif (input.type === "false") {
rpnOperations.push({ type: "number", value: 0 });
} else if (input.type === "numberSymbol") {
rpnOperations.push({ type: "numberSymbol", value: input.value });
} else if (input.type === "engineField") {
const localName = `local_${localsLabel}${fetchOperations.length}`;
fetchOperations.push({
local: localName,
value: {
type: "engineField",
value: input.value,
},
});
rpnOperations.push({
type: "local",
value: localName,
});
} else {
rpnOperations.push(input);
}
return [peepholeRPN(rpnOperations), fetchOperations];
};
export const sortFetchOperations = (
input: PrecompiledValueFetch[],
): PrecompiledValueFetch[] => {
return [...input].sort((a, b) => {
const toKey = (value: PrecompiledValueFetch): string => {
if ("target" in value.value) {
const symbol =
typeof value.value.target === "string"
? value.value.target
: value.value.target.symbol;
return `${symbol}::${value.value.type}`;
} else Eif (value.value.type === "engineField") {
return `engineField::${value.value.value}`;
}
assertUnreachable(value.value);
return "";
};
const aKey = toKey(a);
const bKey = toKey(b);
return aKey.localeCompare(bKey);
});
};
export const multiplyScriptValueConst = (
value: ScriptValue,
num: number,
): ScriptValue => {
return {
type: "mul",
valueA: value,
valueB: {
type: "number",
value: num,
},
};
};
export const shiftLeftScriptValueConst = (
value: ScriptValue,
num: number,
): ScriptValue => {
return {
type: "shl",
valueA: value,
valueB: {
type: "number",
value: num,
},
};
};
export const shiftRightScriptValueConst = (
value: ScriptValue,
num: number,
): ScriptValue => {
return {
type: "shr",
valueA: value,
valueB: {
type: "number",
value: num,
},
};
};
export const addScriptValueConst = (
value: ScriptValue,
num: number,
): ScriptValue => {
return {
type: "add",
valueA: value,
valueB: {
type: "number",
value: num,
},
};
};
export const subScriptValueConst = (
value: ScriptValue,
num: number,
): ScriptValue => {
return {
type: "sub",
valueA: value,
valueB: {
type: "number",
value: num,
},
};
};
export const addScriptValueToScriptValue = (
valueA: ScriptValue,
valueB: ScriptValue,
): ScriptValue => {
return {
type: "add",
valueA: valueA,
valueB: valueB,
};
};
export const clampScriptValueConst = (
value: ScriptValue,
min: number,
max: number,
): ScriptValue => {
return {
type: "max",
valueA: {
type: "number",
value: min,
},
valueB: {
type: "min",
valueA: {
type: "number",
value: max,
},
valueB: value,
},
};
};
export const maskScriptValueConst = (
value: ScriptValue,
mask: number,
): ScriptValue => {
return {
type: "bAND",
valueA: value,
valueB: {
type: "number",
value: mask,
},
};
};
export const peepholeRPN = (
rpn: PrecompiledValueRPNOperation[],
): PrecompiledValueRPNOperation[] => {
const optimised: PrecompiledValueRPNOperation[] = [];
let i = 0;
while (i < rpn.length) {
// Match SHR X + Add/Sub Y + SHL X
// commonly used in calculations involving adding tiles/pixels values to subpixel variables
if (
i + 5 < rpn.length &&
rpn[i].type === "number" &&
rpn[i + 1].type === "shr" &&
rpn[i + 2].type === "number" &&
(rpn[i + 3].type === "add" || rpn[i + 3].type === "sub") &&
rpn[i + 4].type === "number" &&
rpn[i + 5].type === "shl"
) {
const shrAmount = (rpn[i] as { value: number }).value;
const addAmount = (rpn[i + 2] as { value: number }).value;
const op = rpn[i + 3];
const shlAmount = (rpn[i + 4] as { value: number }).value;
if (shrAmount === shlAmount) {
const combined = addAmount << shlAmount;
const mask = ~((1 << shlAmount) - 1) & 0xffff;
optimised.push({ type: "number", value: combined });
optimised.push(op);
optimised.push({ type: "number", value: mask });
optimised.push({ type: "bAND" });
i += 6;
continue;
}
}
// SHR N followed by SHL N = clear lower N bits
if (
i + 3 < rpn.length &&
rpn[i].type === "number" &&
rpn[i + 1].type === "shr" &&
rpn[i + 2].type === "number" &&
rpn[i + 3].type === "shl"
) {
const shrAmount = (rpn[i] as { value: number }).value;
const shlAmount = (rpn[i + 2] as { value: number }).value;
if (shrAmount === shlAmount) {
const mask = ~((1 << shlAmount) - 1) & 0xffff;
optimised.push({ type: "number", value: mask });
optimised.push({ type: "bAND" });
i += 4;
continue;
}
}
optimised.push(rpn[i]);
i++;
}
return optimised;
};
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