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Update Instruction Set

zxq5
2025-06-16 16:07:00 +01:00
parent 7e8af97aa7
commit 46ce37539b
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Instruction-Set.md
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@@ -8,9 +8,7 @@ Also note that immediate (constant/literal) arguments are 16-bits long in I (imm
| Type | Description |
| -- | -- |
| R | Used when an instruction takes one or more register arguments, but no immediates. This type is also used by shift and rotation operations, as it contains a 5 bit shift amount field. |
| I | Used when an instruction takes at most two register arguments as well as a halfword immediate argument. This is typically used by immediate arithmetic operations e.g. addi, as well as loads and stores (where a base register and immediate offset are passed).
Also used by branching instructions. The operand is a signed offset from the current value of PCX. |
| I | Used when an instruction takes at most two register arguments as well as a halfword immediate argument. This is typically used by immediate arithmetic operations e.g. addi, as well as loads and stores (where a base register and immediate offset are passed). Also used by branching instructions. The operand is a signed offset from the current value of PCX. |
| J | Used by jumps excluding jr, which uses a register as its argument.
Jumps are absolute addresses, but there is a 256MB region around PCX since the argument is 26 bits.