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Add more great ideas to the VM spec

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Signed-off-by: Alek Ratzloff <alekratz@gmail.com>
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Alek Ratzloff
2020-01-27 18:42:15 -05:00
parent b16974c7c4
commit a5388c8b86
1 changed files with 5 additions and 1 deletions
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@@ -41,6 +41,11 @@ CPU flags are addressed by bit index, going from right to left.
* Overwriting a register without its value being used * Overwriting a register without its value being used
* Mixing arithmetic with bit twiddling on the same target * Mixing arithmetic with bit twiddling on the same target
## Register ideas
* NULL - a register that will always be zero for reading and will not change after writing.
* Other possible names: Z, NIL
# Instructions # Instructions
## Arithmetic ## Arithmetic
@@ -48,7 +53,6 @@ CPU flags are addressed by bit index, going from right to left.
Arithmetic instructions store their result in the first register specified. Overflow is handled by Arithmetic instructions store their result in the first register specified. Overflow is handled by
wrapping around to 0. wrapping around to 0.
* Add * Add
* **Params**: REG1, REG2 * **Params**: REG1, REG2
* `REG1 = REG1 + REG2` * `REG1 = REG1 + REG2`