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| -rw-r--r-- | doc/il.txt | 60 |
1 files changed, 52 insertions, 8 deletions
diff --git a/doc/il.txt b/doc/il.txt index a80ee22..5efe099 100644 --- a/doc/il.txt +++ b/doc/il.txt @@ -23,16 +23,12 @@ * <@ Blocks > * <@ Instructions > * <@ Jumps > - 6. Integer Instructions - * Arithmetic + 6. <@ Regular Instructions > + * <@ Arithmetic > * Memory * Comparisons - 7. Floating Point Instructions - * Arithmetic - * Memory - * Comparisons - 8. Special Instructions - * Conversions and Extensions + 7. Special Instructions + * Conversions * Casts * Phi @@ -464,3 +460,51 @@ the following list. returned must have the type given in the function prototype. If the function prototype does not specify a return type, no return value can be used. + +- 6. Regular Instructions +------------------------- + +Instructions are the smallest piece of code in the IL, they +form the body of <@ Blocks >. + +The types of instructions is described below using a short +type string. A type string specifies all the valid return +types an instruction can have, its arity, and the type of +its arguments in function of its return type. + +Type strings begin with acceptable return types, then +follows, in parentheses, the possible types for the arguments. +If the n-th return type of the type string is used for an +instruction, the arguments must use the n-th type listed for +them in the type string. When an instruction does not have a +return type, the type string only contains the types of the +arguments. + +The following abbreviations are used. + + * `T` stands for `wlsd` + * `I` stands for `wl` + * `F` stands for `sd` + * `m` stands for the type of pointers on the target, on + x64 it is the same as `l` + +For example, consider the type string `wl(F)`, it mentions +that the instruction has only one argument and that if the +return type used is long, the argument must be of type double. + + +~ Arithmetic +~~~~~~~~~~~~ + + * `add sub div mul` -- `T(T,T)` + + The base arithmetic instructions are available for all + types, integers and floating points. When the division + is used with word or long return type, the arguments are + treated as signed. The other instructions are sign + agnositc. + + * `udiv` -- `I(I,I)` + + An unsigned division, to use on integer types only when + the integers represented are unsigned. |