Add a separate instruction for storing/loading data from stack

[HyperWinX]

Due to the restrictions of the instruction encoding method, HyperCPU ISA allows max 256 offset. Using a separate register for extracting variables is really expensive, because you'll need at most two instructions to load something from the stack.

I propose two new instructions called LODSB - LOad Data from Stack, relative to xBp, and STDSB - STore Data to Stack, relative to xBp. Syntax of the instructions as follows:

lodsb <r/rm>, <sint>;
stdsb <r/rm>, <sint>;

LODSB - First operand specifies the destination to load data, second operand - offset from XBP register, without inverting the sign, so if you pass 4 - address will be xbp + 4.
STDSB - First operand specifies the source register (...yeah), second operand - offset from XBP register without inverting the sign.

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[aceinetx]

We should probably have the same instruction, but it does a store instead of load. So 2 instructions that do load/store from/to the stack

Overall a pretty good concept.

[HyperWinX]

We should probably have the same instruction, but it does a store instead of load. So 2 instructions that do load/store from/to the stack

Overall a pretty good concept.

Indeed, I missed that. Gonna update the issue.