⚡️ Optimize LibSort _flipSign (#1431)

Vectorized · web-flow · commit 701406e8126c · 2025-06-10T17:50:06.000+02:00
diff --git a/src/utils/LibSort.sol b/src/utils/LibSort.sol
@@ -750,10 +750,10 @@ library LibSort {
     function _flipSign(int256[] memory a) private pure {
         /// @solidity memory-safe-assembly
         assembly {
-            let w := shl(255, 1)
-            for { let end := add(a, shl(5, mload(a))) } iszero(eq(a, end)) {} {
-                a := add(a, 0x20)
-                mstore(a, add(mload(a), w))
+            let q := shl(255, 1)
+            for { let i := add(a, shl(5, mload(a))) } iszero(eq(a, i)) {} {
+                mstore(i, add(mload(i), q))
+                i := sub(i, 0x20)
             }
         }
     }

Original file line number	Diff line number	Diff line change
`@@ -750,10 +750,10 @@ library LibSort {`
`750`	`750`	`function _flipSign(int256[] memory a) private pure {`
`751`	`751`	`/// @solidity memory-safe-assembly`
`752`	`752`	`assembly {`
`753`		`- let w := shl(255, 1)`
`754`		`- for { let end := add(a, shl(5, mload(a))) } iszero(eq(a, end)) {} {`
`755`		`- a := add(a, 0x20)`
`756`		`- mstore(a, add(mload(a), w))`
	`753`	`+ let q := shl(255, 1)`
	`754`	`+ for { let i := add(a, shl(5, mload(a))) } iszero(eq(a, i)) {} {`
	`755`	`+ mstore(i, add(mload(i), q))`
	`756`	`+ i := sub(i, 0x20)`
`757`	`757`	`}`
`758`	`758`	`}`
`759`	`759`	`}`