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Improve poseidon call #1413

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chriseth opened this issue Jun 3, 2024 · 0 comments
Open

Improve poseidon call #1413

chriseth opened this issue Jun 3, 2024 · 0 comments

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@chriseth
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chriseth commented Jun 3, 2024

In the poseidon syscall, we use

x2 <== wrap(x2 - 4);
mstore x2, ...;
x2 <== wrap(x2 - 4);
mstore x2, ...

But we could actually use

mstore x2 - 4, ...;
mstore x2 - 8, ...;

if we at the start of the routine ensure that x2 is large enough.
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