Why uint32(block.timestamp % 2**32) ?

[Nick Mudge]

The update function in UniswapV2Pair.sol has this line of code:

uint32 blockTimestamp = uint32(block.timestamp % 2**32);

In case of uint32 overflow the following return the same value:

uint32 blockTimestamp = uint32(block.timestamp % 2**32);
uint32 blockTimestamp = uint32(block.timestamp);

So why do this block.timestamp % 2**32 ?

It looks like the code is requiring the gas cost of doing a modulus operation for no reason.

Or is it done to show that overflow is okay?

[Moody Salem]

You already reported this #96

[Nick Mudge]

Oh, sorry, I didn't realize that.

[Sufiyan]

can you explain us ??

[Sufiyan]

can somebody explain why the value is not changing, even after block.timestamp % 2**32 ?? i know it is use for overflow but how ?

[Pradeepvarma_22]

can somebody explain why the value is not changing, even after block.timestamp % 2**32 ?? i know it is use for overflow but how ?

This may help
https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2020-September/018172.html

[Sufiyan]

can somebody explain why the value is not changing, even after block.timestamp % 2**32 ?? i know it is use for overflow but how ?

This may help

https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2020-September/018172.html

Thanks i got it