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Document difficulty vs. prevrandao

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Alex Beregszaszi 2022-11-11 12:15:35 +01:00 committed by Kamil Śliwak
parent eb8af2caec
commit c353eb0af5
2 changed files with 9 additions and 2 deletions
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2
docs/using-the-compiler.rst
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@ -173,7 +173,7 @@ at each version. Backward compatibility is not guaranteed between each version.
- ``london`` (**default**)
- The block's base fee (`EIP-3198 <https://eips.ethereum.org/EIPS/eip-3198>`_ and `EIP-1559 <https://eips.ethereum.org/EIPS/eip-1559>`_) can be accessed via the global ``block.basefee`` or ``basefee()`` in inline assembly.
- ``paris``
- No changes.
- No changes, however the semantics of the ``difficulty`` value have changed (see `EIP-4399 <https://eips.ethereum.org/EIPS/eip-4399>`_).
.. index:: ! standard JSON, ! --standard-json
.. _compiler-api:

9
docs/yul.rst
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@ -933,7 +933,7 @@ the ``dup`` and ``swap`` instructions as well as ``jump`` instructions, labels a
+-------------------------+-----+---+-----------------------------------------------------------------+
| number() | | F | current block number |
+-------------------------+-----+---+-----------------------------------------------------------------+
| difficulty() | | F | difficulty of the current block |
| difficulty() | | F | difficulty of the current block (see note below) |
+-------------------------+-----+---+-----------------------------------------------------------------+
| gaslimit() | | F | block gas limit of the current block |
+-------------------------+-----+---+-----------------------------------------------------------------+
@ -948,6 +948,13 @@ the ``dup`` and ``swap`` instructions as well as ``jump`` instructions, labels a
You need to use the ``returndatasize`` opcode to check which part of this memory area contains the return data.
The remaining bytes will retain their values as of before the call.
.. note::
With the Paris network upgrade the semantics of ``difficulty`` have been changed.
It returns the value of ``prevrandao``, which is a 256-bit value, whereas the highest recorded
difficulty value within Ethash was ~54 bits.
This change is described in `EIP-4399 <https://eips.ethereum.org/EIPS/eip-4399>`_.
Please note that irrelevant to which EVM version is selected in the compiler, the semantics of
instructions depend on the final chain of deployment.
In some internal dialects, there are additional functions: