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Code generator fixups

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- fixed a crash in Instruction::print
- new example program
- added a design note about the number of x86 instruction per VM instruction
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tevador
2019-06-23 23:10:29 +02:00
parent 77f809e8db
commit e6ba0a1b7d
4 changed files with 956 additions and 953 deletions
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doc/design.md
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@@ -133,6 +133,10 @@ This section describes the design of the RandomX virtual machine (VM).
RandomX uses a fixed-length instruction encoding with 8 bytes per instruction. This allows a 32-bit immediate value to be included in the instruction word. The interpretation of the instruction word bits was chosen so that any 8-byte word is a valid instruction. This allows for very efficient random program generation (see chapter 1.1.1).
#### 2.1.1 Instruction complexity
The VM is a complex instruction set machine that allows both register and memory addressed operands. However, each RandomX instructions translates to only 1-7 x86 instructions (1.8 on average). It is important to keep the instruction complexity relatively low to minimize the efficiency advantage of specialized hardware with a tailored instruction set.
### 2.2 Program
The program executed by the VM has the form of a loop consisting of 256 random instructions.