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* 6158 - standardize opcode namesKartik Agaram2020-03-211-4/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | At the lowest level, SubX without syntax sugar uses names without prepositions. For example, 01 and 03 are both called 'add', irrespective of source and destination operand. Horizontal space is at a premium, and we rely on the comments at the end of each line to fully describe what is happening. Above that, however, we standardize on a slightly different naming convention across: a) SubX with syntax sugar, b) Mu, and c) the SubX code that the Mu compiler emits. Conventions, in brief: - by default, the source is on the left and destination on the right. e.g. add %eax, 1/r32/ecx ("add eax to ecx") - prepositions reverse the direction. e.g. add-to %eax, 1/r32/ecx ("add ecx to eax") subtract-from %eax, 1/r32/ecx ("subtract ecx from eax") - by default, comparisons are left to right while 'compare<-' reverses. Before, I was sometimes swapping args to make the operation more obvious, but that would complicate the code-generation of the Mu compiler, and it's nice to be able to read the output of the compiler just like hand-written code. One place where SubX differs from Mu: copy opcodes are called '<-' and '->'. Hopefully that fits with the spirit of Mu rather than the letter of the 'copy' and 'copy-to' instructions.
* 6157Kartik Agaram2020-03-211-247/+41
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* 6083Kartik Agaram2020-03-061-4/+4
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* 5924Kartik Agaram2020-01-271-30/+30
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* 5897 - rename comparison instructionsKartik Agaram2020-01-161-7/+7
| | | | | | | Signed and unsigned don't quite capture the essence of what the different combinations of x86 flags are doing for SubX. The crucial distinction is that one set of comparison operators is for integers and the second is for addresses.
* 5888Kartik Agaram2020-01-141-228/+222
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* 5887 - reorganize libraryKartik Agaram2020-01-141-0/+605
Layers 0-89 are used in self-hosting SubX. Layers 90-99 are not needed for self-hosting SubX, and therefore could use transitional levels of syntax sugar. Layers 100 and up use all SubX syntax sugar.