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The negative-tick edge case comes from compressing a tick before mapping it into a bitmap. The Uniswap v4 SDK guide applies Math.floor(tick / tickSpacing), then subtracts one more for a negative tick that is not divisible by the spacing. That second adjustment is redundant in JavaScript: Math.floor already rounds toward negative infinity. The cited issue concerns helper and periphery logic; the available evidence does not establish a core swap exploit or say whether a later Quoter release changed the behavior.
What tick compression does
Uniswap ticks mark boundaries in price space. Each tick represents a 0.01% price change, and crossing an active tick can change which liquidity is active. Uniswap’s concentrated-liquidity documentation describes this relationship.
Tick spacing restricts which tick indices can be initialized. For spacing 3, the core source shows the sequence ..., -6, -3, 0, 3, 6, .... A bitmap represents 256 initializable tick positions in each word. To find a position, code compresses a tick by the pool’s spacing, then derives the bitmap word and bit from that compressed index. The v4 TickBitmap library and the v4 SDK guide describe this indexing context.
Why the extra adjustment misbehaves
The SDK guide displays this helper:
function tickToWord(tick: number): number {
let compressed = Math.floor(tick / tickSpacing)
if (tick < 0 && tick % tickSpacing !== 0) {
compressed -= 1
}
return compressed >> 8
}The problem is that the conditional applies a second downward step after Math.floor has already rounded down. For example, with tick -1 and spacing 10, the quotient is -0.1; Math.floor(-0.1) is -1, and the extra decrement changes it to -2. This is an arithmetic illustration of the displayed expression, not a test result.
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Negative values make rounding rules important. Integer division in some languages truncates toward zero, while floor rounds toward negative infinity. A correction intended for truncating division can be appropriate in one implementation and wrong when applied after a floor operation. Here, the principle is to avoid applying another floor adjustment after Math.floor. Do not treat the abbreviated replacement printed in the audit excerpt as verified corrected code: it returns tick >> 8 rather than using a compressed index, which conflicts with the indexing process described around it.
What the draft periphery review establishes
A draft Spearbit periphery review discusses a related negative-tick issue. Its example changes PoolTicksCounter from direct signed division and modulo calculations for tickBefore and tickAfter to compress(key.tickSpacing).position(). The excerpt also notes a related v3-periphery issue and points to the SDK documentation. The draft review records Uniswap’s response that it would not fix the Quoter-related issue in that revision because, as the response put it, “For various reasons we are now going to be re-architecting our Quoter contract.”
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That response is historical and appears in a draft review. It does not establish whether a later Quoter release corrected the issue. Nor does the excerpt prove that every negative tick fails, that users’ funds are at risk, or that core swap execution is exploitable.
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In the current v4 core source, swap traversal calls nextInitializedTickWithinOneWord with the current tick and tick spacing. The Pool library provides that implementation context. TickMath defines supported ticks from -887272 to 887272 and minimum tick spacing of 1.
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Those core details explain where tick and bitmap calculations fit in the system; they do not, on their own, connect the reported helper behavior to a failure in core swaps. The evidence here is about SDK documentation and periphery/helper code, so claims about deployed contracts or current remediation require separate, dated evidence.
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