Use packed stack-based version of Slot0 structure

.forge-snapshots/add liquidity to already existing position with salt.snap

@@ -1 +1 @@
-153625
+153643

.forge-snapshots/addLiquidity CA fee.snap

@@ -1 +1 @@
-331831
+331825

.forge-snapshots/addLiquidity with empty hook.snap

@@ -1 +1 @@
-286606
+286600

.forge-snapshots/addLiquidity with native token.snap

@@ -1 +1 @@
-143835
+143853

.forge-snapshots/create new liquidity to a position with salt.snap

@@ -1 +1 @@
-302153
+302147

.forge-snapshots/initialize.snap

@@ -1 +1 @@
-62202
+61910

.forge-snapshots/poolManager bytecode size.snap

@@ -1 +1 @@
-22099
+21967

.forge-snapshots/removeLiquidity CA fee.snap

@@ -1 +1 @@
-187273
+187291

.forge-snapshots/removeLiquidity with empty hook.snap

@@ -1 +1 @@
-123451
+123469

.forge-snapshots/removeLiquidity with native token.snap

@@ -1 +1 @@
-120238
+120256

.forge-snapshots/simple addLiquidity second addition same range.snap

@@ -1 +1 @@
-104914
+104932

.forge-snapshots/simple addLiquidity.snap

@@ -1 +1 @@
-167756
+167750

.forge-snapshots/simple removeLiquidity some liquidity remains.snap

@@ -1 +1 @@
-98511
+98529

.forge-snapshots/simple removeLiquidity.snap

@@ -1 +1 @@
-90877
+90895

.forge-snapshots/simple swap with native.snap

@@ -1 +1 @@
-117304
+117047

.forge-snapshots/simple swap.snap

@@ -1 +1 @@
-132465
+132208

.forge-snapshots/swap CA custom curve + swap noop.snap

@@ -1 +1 @@
-134799
+134601

.forge-snapshots/swap CA fee on unspecified.snap

@@ -1 +1 @@
-183793
+183536

.forge-snapshots/swap against liquidity with native token.snap

@@ -1 +1 @@
-112929
+112672

.forge-snapshots/swap against liquidity.snap

@@ -1 +1 @@
-124272
+124015

.forge-snapshots/swap burn 6909 for input.snap

@@ -1 +1 @@
-136325
+136056

.forge-snapshots/swap burn native 6909 for input.snap

@@ -1 +1 @@
-125453
+125196

.forge-snapshots/swap mint native output as 6909.snap

@@ -1 +1 @@
-147514
+147245

.forge-snapshots/swap mint output as 6909.snap

@@ -1 +1 @@
-164319
+164062

.forge-snapshots/swap skips hook call if hook is caller.snap

@@ -1 +1 @@
-223093
+222579

.forge-snapshots/swap with dynamic fee.snap

@@ -1 +1 @@
-148520
+148263

.forge-snapshots/swap with hooks.snap

@@ -1 +1 @@
-124284
+124027

.forge-snapshots/swap with lp fee and protocol fee.snap

@@ -1 +1 @@
-180775
+180495

.forge-snapshots/update dynamic fee in before swap.snap

@@ -1 +1 @@
-159006
+158738

src/PoolManager.sol

@@ -18,6 +18,7 @@ import {ERC6909Claims} from "./ERC6909Claims.sol";
 import {PoolId, PoolIdLibrary} from "./types/PoolId.sol";
 import {BalanceDelta, BalanceDeltaLibrary, toBalanceDelta} from "./types/BalanceDelta.sol";
 import {BeforeSwapDelta} from "./types/BeforeSwapDelta.sol";
+import {Slot0} from "./types/Slot0.sol";
 import {Lock} from "./libraries/Lock.sol";
 import {CurrencyDelta} from "./libraries/CurrencyDelta.sol";
 import {NonZeroDeltaCount} from "./libraries/NonZeroDeltaCount.sol";

src/libraries/Pool.sol

@@ -10,6 +10,7 @@ import {TickMath} from "./TickMath.sol";
 import {SqrtPriceMath} from "./SqrtPriceMath.sol";
 import {SwapMath} from "./SwapMath.sol";
 import {BalanceDelta, toBalanceDelta, BalanceDeltaLibrary} from "../types/BalanceDelta.sol";
+import {Slot0} from "../types/Slot0.sol";
 import {ProtocolFeeLibrary} from "./ProtocolFeeLibrary.sol";
 import {LiquidityMath} from "./LiquidityMath.sol";
 import {LPFeeLibrary} from "./LPFeeLibrary.sol";
@@ -63,20 +64,6 @@ library Pool {
     /// @notice Thrown when trying to swap with max lp fee and specifying an output amount
     error InvalidFeeForExactOut();
 
-    struct Slot0 {
-        // the current price
-        uint160 sqrtPriceX96;
-        // the current tick
-        int24 tick;
-        // protocol fee, expressed in hundredths of a bip
-        // upper 12 bits are for 1->0, and the lower 12 are for 0->1
-        // the maximum is 1000 - meaning the maximum protocol fee is 0.1%
-        // the protocolFee is taken from the input first, then the lpFee is taken from the remaining input
-        uint24 protocolFee;
-        // used for the lp fee, either static at initialize or dynamic via hook
-        uint24 lpFee;
-    }
-
     // info stored for each initialized individual tick
     struct TickInfo {
         // the total position liquidity that references this tick
@@ -111,23 +98,28 @@ library Pool {
         internal
         returns (int24 tick)
     {
-        if (self.slot0.sqrtPriceX96 != 0) revert PoolAlreadyInitialized();
+        if (self.slot0.sqrtPriceX96() != 0) revert PoolAlreadyInitialized();
 
         tick = TickMath.getTickAtSqrtPrice(sqrtPriceX96);
 
-        self.slot0 = Slot0({sqrtPriceX96: sqrtPriceX96, tick: tick, protocolFee: protocolFee, lpFee: lpFee});
+        self.slot0 = 
+            Slot0.wrap(bytes32(0))
+                .setSqrtPriceX96(sqrtPriceX96)
+                .setTick(tick)
+                .setProtocolFee(protocolFee)
+                .setLpFee(lpFee);
     }
 
     function setProtocolFee(State storage self, uint24 protocolFee) internal {
         if (self.isNotInitialized()) revert PoolNotInitialized();
 
-        self.slot0.protocolFee = protocolFee;
+        self.slot0 = self.slot0.setProtocolFee(protocolFee);
     }
 
     /// @notice Only dynamic fee pools may update the lp fee.
     function setLPFee(State storage self, uint24 lpFee) internal {
         if (self.isNotInitialized()) revert PoolNotInitialized();
-        self.slot0.lpFee = lpFee;
+        self.slot0 = self.slot0.setLpFee(lpFee);
     }
 
     struct ModifyLiquidityParams {
@@ -217,7 +209,8 @@ library Pool {
         }
 
         if (liquidityDelta != 0) {
-            (int24 tick, uint160 sqrtPriceX96) = (self.slot0.tick, self.slot0.sqrtPriceX96);
+            Slot0 _slot0 = self.slot0;
+            (int24 tick, uint160 sqrtPriceX96) = (_slot0.tick(), _slot0.sqrtPriceX96());
             if (tick < tickLower) {
                 // current tick is below the passed range; liquidity can only become in range by crossing from left to
                 // right, when we'll need _more_ currency0 (it's becoming more valuable) so user must provide it
@@ -302,23 +295,23 @@ library Pool {
         internal
         returns (BalanceDelta result, uint256 feeForProtocol, uint24 swapFee, SwapState memory state)
     {
-        Slot0 memory slot0Start = self.slot0;
+        Slot0 slot0Start = self.slot0;
         bool zeroForOne = params.zeroForOne;
 
         SwapCache memory cache = SwapCache({
             liquidityStart: self.liquidity,
-            protocolFee: zeroForOne ? slot0Start.protocolFee.getZeroForOneFee() : slot0Start.protocolFee.getOneForZeroFee()
+            protocolFee: zeroForOne ? slot0Start.protocolFee().getZeroForOneFee() : slot0Start.protocolFee().getOneForZeroFee()
         });
 
         state.amountSpecifiedRemaining = params.amountSpecified;
         state.amountCalculated = 0;
-        state.sqrtPriceX96 = slot0Start.sqrtPriceX96;
-        state.tick = slot0Start.tick;
+        state.sqrtPriceX96 = slot0Start.sqrtPriceX96();
+        state.tick = slot0Start.tick();
         state.feeGrowthGlobalX128 = zeroForOne ? self.feeGrowthGlobal0X128 : self.feeGrowthGlobal1X128;
         state.liquidity = cache.liquidityStart;
 
         swapFee =
-            cache.protocolFee == 0 ? slot0Start.lpFee : uint24(cache.protocolFee).calculateSwapFee(slot0Start.lpFee);
+            cache.protocolFee == 0 ? slot0Start.lpFee() : uint24(cache.protocolFee).calculateSwapFee(slot0Start.lpFee());
 
         bool exactInput = params.amountSpecified < 0;
 
@@ -329,15 +322,15 @@ library Pool {
         if (params.amountSpecified == 0) return (BalanceDeltaLibrary.ZERO_DELTA, 0, swapFee, state);
 
         if (zeroForOne) {
-            if (params.sqrtPriceLimitX96 >= slot0Start.sqrtPriceX96) {
-                revert PriceLimitAlreadyExceeded(slot0Start.sqrtPriceX96, params.sqrtPriceLimitX96);
+            if (params.sqrtPriceLimitX96 >= slot0Start.sqrtPriceX96()) {
+                revert PriceLimitAlreadyExceeded(slot0Start.sqrtPriceX96(), params.sqrtPriceLimitX96);
             }
             if (params.sqrtPriceLimitX96 <= TickMath.MIN_SQRT_PRICE) {
                 revert PriceLimitOutOfBounds(params.sqrtPriceLimitX96);
             }
         } else {
-            if (params.sqrtPriceLimitX96 <= slot0Start.sqrtPriceX96) {
-                revert PriceLimitAlreadyExceeded(slot0Start.sqrtPriceX96, params.sqrtPriceLimitX96);
+            if (params.sqrtPriceLimitX96 <= slot0Start.sqrtPriceX96()) {
+                revert PriceLimitAlreadyExceeded(slot0Start.sqrtPriceX96(), params.sqrtPriceLimitX96);
             }
             if (params.sqrtPriceLimitX96 >= TickMath.MAX_SQRT_PRICE) {
                 revert PriceLimitOutOfBounds(params.sqrtPriceLimitX96);
@@ -443,7 +436,7 @@ library Pool {
             }
         }
 
-        (self.slot0.tick, self.slot0.sqrtPriceX96) = (state.tick, state.sqrtPriceX96);
+        self.slot0 = slot0Start.setTick(state.tick).setSqrtPriceX96(state.sqrtPriceX96);
 
         // update liquidity if it changed
         if (cache.liquidityStart != state.liquidity) self.liquidity = state.liquidity;
@@ -499,7 +492,7 @@ library Pool {
     {
         TickInfo storage lower = self.ticks[tickLower];
         TickInfo storage upper = self.ticks[tickUpper];
-        int24 tickCurrent = self.slot0.tick;
+        int24 tickCurrent = self.slot0.tick();
 
         unchecked {
             if (tickCurrent < tickLower) {
@@ -548,7 +541,7 @@ library Pool {
 
         if (liquidityGrossBefore == 0) {
             // by convention, we assume that all growth before a tick was initialized happened _below_ the tick
-            if (tick <= self.slot0.tick) {
+            if (tick <= self.slot0.tick()) {
                 info.feeGrowthOutside0X128 = self.feeGrowthGlobal0X128;
                 info.feeGrowthOutside1X128 = self.feeGrowthGlobal1X128;
             }
@@ -587,7 +580,7 @@ library Pool {
     }
 
     function isNotInitialized(State storage self) internal view returns (bool) {
-        return self.slot0.sqrtPriceX96 == 0;
+        return self.slot0.sqrtPriceX96() == 0;
     }
 
     /// @notice Clears tick data