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Mention that memory is organised as 256-bit words

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Alex Beregszaszi 2016-10-13 19:00:57 +01:00
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docs/introduction-to-smart-contracts.rst
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@ -350,10 +350,10 @@ from its own.
The second memory area is called **memory**, of which a contract obtains The second memory area is called **memory**, of which a contract obtains
a freshly cleared instance for each message call. Memory is linear and can be a freshly cleared instance for each message call. Memory is linear and can be
addressed at byte level, but reads are limited to a width of 256 bits, while writes addressed at byte level, but reads are limited to a width of 256 bits, while writes
can be either 8 bits or 256 bits wide. Memory is expanded by accessing (either can be either 8 bits or 256 bits wide. Memory is expanded by a word (256-bit), when
reading or writing) a previously untouched memory offset. At the time of expansion, accessing (either reading or writing) a previously untouched memory word (ie. any offset
the cost in gas must be paid. Memory is more costly the larger it grows (it scales within a word). At the time of expansion, the cost in gas must be paid. Memory is more
quadratically). costly the larger it grows (it scales quadratically).
The EVM is not a register machine but a stack machine, so all The EVM is not a register machine but a stack machine, so all
computations are performed on an area called the **stack**. It has a maximum size of computations are performed on an area called the **stack**. It has a maximum size of