cerc-io/solidity
16
0
Fork 0
mirror of https://github.com/ethereum/solidity synced 2023-10-03 13:03:40 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Use temporary variable for sum example

Browse Source
This commit is contained in:
Alex Beregszaszi 2017-08-10 17:47:35 +01:00
parent 34503d98d7
commit 9358001ba4
1 changed files with 10 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
docs/assembly.rst
View File

@ -104,19 +104,21 @@ you really know what you are doing.
let len := mload(_data)
// Skip over the length field.
_data := add(_data, 0x20)
//
// Keep temporary variable so it can be incremented in place.
//
// NOTE: incrementing _data would result in an unusable
// _data variable after this assembly block
let data := add(_data, 0x20)
// Iterate until the bound is not met.
for
{ let end := add(_data, len) }
lt(_data, end)
{ _data := add(_data, 0x20) }
{ let end := add(data, len) }
lt(data, end)
{ data := add(data, 0x20) }
{
o_sum := add(o_sum, mload(_data))
o_sum := add(o_sum, mload(data))
}
// NOTE: after this point it is not safe to use _data in Solidity code
// because its offsets are in an invalid position
}
}
}