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(* a register containing nat numbers *)
register [|0:256|] dummy_reg
(* and one containing a byte *)
register (bit[8]) dummy_reg2
(* a function to read from memory; wmem serves no purpose currently,
memory-writing functions are figured out syntactically. *)
val extern nat -> nat effect { wmem , rmem } MEM
val extern nat -> nat effect { wmem , rmem } MEM_GPU
val extern forall Nat 'n . ( nat, [|'n|] ) -> (bit['n * 8]) effect { wmem , rmem } MEM_SIZE
val extern nat -> (bit[8]) effect { wmem , rmem } MEM_WORD
function nat (deinfix * ) ( (nat) x, (nat) y ) = 42
function nat main _ = {
(* left-hand side function call = memory write *)
MEM(0) := 0;
(* memory read, thanks to effect { rmem} above *)
ignore(MEM(0));
(* register write, idem *)
dummy_reg := 1;
(* register read, thanks to register declaration *)
ignore(dummy_reg);
MEM_WORD(0) := 0b10101010;
(MEM_WORD(0))[3..4] := 0b10;
(* XXX this one is broken - I don't what it should do,
or even if we should accept it, but the current result
is to eat up one bit, ending up with a 7-bit word. *)
(MEM_WORD(0))[4..3] := 0b10;
ignore(MEM_WORD(0));
(* infix call *)
ignore(7 * 9);
(* Some more checks *)
MEM(1) := 2;
ignore(MEM(1));
MEM_GPU(0) := 3;
ignore(MEM_GPU(0));
MEM_SIZE(0,1) := 0b11110000;
ignore(MEM_SIZE(0,1));
MEM_SIZE(0,2) := 0b1111000010100000;
ignore(MEM_SIZE(0,2));
(* extern calls *)
dummy_reg := 3 + 39;
dummy_reg := (deinfix +)(5, 37);
(* casts and external calls *)
dummy_reg := 0b01 + 0b01;
dummy_reg2 := 0b00000001;
dummy_reg2 := dummy_reg2 + dummy_reg2; (* cast to nat for add call *)
dummy_reg2; (* cast again and return 4 *)
}
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