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Diffstat (limited to 'mu_instructions')
| -rw-r--r-- | mu_instructions | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/mu_instructions b/mu_instructions index f9866aca..e0df3496 100644 --- a/mu_instructions +++ b/mu_instructions @@ -1,10 +1,17 @@ ## Mu's instructions and their table-driven translation -Mu is a statement-oriented language. Blocks consist of flat lists of instructions. -The following chart shows all the instruction forms supported by Mu, along -with the instruction they're translated to. Variables of the form 'var/reg' -live in a register, and other variables are assumed to live on the stack at -some 'stack-offset' from ebp. +See http://akkartik.name/akkartik-convivial-20200315.pdf for the complete +story. In brief: Mu is a statement-oriented language. Blocks consist of flat +lists of instructions. Instructions can have inputs after the operation, and +outputs to the left of a '<-'. Inputs and outputs must be variables. They can't +include nested expressions. Variables can be literals ('n'), or live in a +register ('var/reg') or in memory ('var') at some 'stack-offset' from the 'ebp' +register. Outputs must be registers. To modify a variable in memory, pass it in +by reference as an input. (Inputs are more precisely called 'inouts'.) +Conversely, registers that are just read from must not be passed as inputs. + +The following chart shows all the instruction forms supported by Mu, along with +the SubX instruction they're translated to. var/eax <- increment => "40/increment-eax" var/ecx <- increment => "41/increment-ecx" |