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Free memory pointer #169

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merged 3 commits into from
Oct 10, 2023
Merged

Free memory pointer #169

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9e179f7
Add free memory pointer function
fkrause98 Oct 10, 2023
a7aede6
Update precompiles/Modexp.yul
fkrause98 Oct 10, 2023
5173fff
Update precompiles/Modexp.yul
fkrause98 Oct 10, 2023
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9 changes: 9 additions & 0 deletions precompiles/Modexp.yul
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Expand Up @@ -3,6 +3,7 @@ object "ModExp" {
object "ModExp_deployed" {
code {


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// CONSTANTS
function LIMB_SIZE_IN_BYTES() -> limbSize {
limbSize := 0x20
Expand All @@ -13,6 +14,14 @@ object "ModExp" {
}
// HELPER FUNCTIONS

/// @notice Returns an address for a free memory region,
/// which will be startPtr...(startPtr+(howManyAdresses*32))
/// @param howManyAdresses The number of addresses needed.
function freeMemoryPointer(howManyAdresses) -> startPtr {
startPtr := mload(0x0)
mstore(0x0, add(startPtr, mul(howManyAdresses, 32)))
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}

/// @notice Stores a one in big unsigned integer form in memory.
/// @param nLimbs The number of limbs needed to represent the operand.
/// @param toAddress The pointer to the MSB of the destination.
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