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| -rw-r--r-- | docs/assembly.rst | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/docs/assembly.rst b/docs/assembly.rst index 2f5b8812..bdb708a9 100644 --- a/docs/assembly.rst +++ b/docs/assembly.rst @@ -96,6 +96,31 @@ you really know what you are doing. } } } + + // Same as above, but accomplish the entire code within inline assembly. + function sumPureAsm(uint[] _data) returns (uint o_sum) { + assembly { + // Load the length (first 32 bytes) + let len := mload(_data) + + // Skip over the length field. + // + // 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) } + { + o_sum := add(o_sum, mload(data)) + } + } + } } |