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Require Export QhasmCommon QhasmUtil State.
Require Export ZArith Sumbool.
Require Export Bedrock.Word.
Import State.
Import Util.
Definition evalTest {n} (o: TestOp) (a b: word n): bool :=
let c := (N.compare (wordToN a) (wordToN b)) in
let eqBit := match c with | Eq => true | _ => false end in
let ltBit := match c with | Lt => true | _ => false end in
let gtBit := match c with | Gt => true | _ => false end in
match o with
| TEq => eqBit
| TLt => ltBit
| TLe => orb (eqBit) (ltBit)
| TGt => gtBit
| TGe => orb (eqBit) (gtBit)
end.
Definition evalCond (c: Conditional) (state: State): option bool :=
match c with
| CTrue => Some true
| CZero n r =>
omap (getReg r state) (fun v =>
if (Nat.eq_dec O (wordToNat v))
then Some true
else Some false)
| CReg n o a b =>
omap (getReg a state) (fun va =>
omap (getReg b state) (fun vb =>
Some (evalTest o va vb)))
| CConst n o a c =>
omap (getReg a state) (fun va =>
Some (evalTest o va (constValueW c)))
end.
Definition evalIntOp {b} (io: IntOp) (x y: word b): (word b) * option bool :=
match io with
| Add =>
let v := (wordToN x + wordToN y)%N in
let c := (N.compare v (Npow2 b)) in
match c as c' return c' = c -> _ with
| Lt => fun _ => (NToWord b v, Some false)
| _ => fun _ => (NToWord b v, Some true)
end eq_refl
| Sub => (wminus x y, None)
| Xor => (wxor x y, None)
| And => (wand x y, None)
| Or => (wor x y, None)
end.
Definition evalCarryOp {b} (io: CarryOp) (x y: word b) (c: bool): (word b) * bool :=
match io with
| AddWidthCarry =>
let v := (wordToN x + wordToN y + (if c then 1%N else 0%N))%N in
let c := (N.compare v (Npow2 b)) in
match c as c' return c' = c -> _ with
| Lt => fun _ => (NToWord b v, false)
| _ => fun _ => (NToWord b v, true)
end eq_refl
end.
Definition evalDualOp {b} (duo: DualOp) (x y: word b) :=
match duo with
| Mult =>
let v := (wordToN x * wordToN y)%N in
let wres := NToWord (b + b) v in
(split1 b b wres, split2 b b wres)
end.
Definition evalRotOp {b} (ro: RotOp) (x: word b) (n: nat) :=
match ro with
| Shl => NToWord b (N.shiftl_nat (wordToN x) n)
| Shr => NToWord b (N.shiftr_nat (wordToN x) n)
end.
Definition evalOperation (o: Operation) (state: State): option State :=
match o with
| IOpConst _ o r c =>
omap (getReg r state) (fun v =>
let (v', co) := (evalIntOp o v (constValueW c)) in
Some (setCarryOpt co (setReg r v' state)))
| IOpReg _ o a b =>
omap (getReg a state) (fun va =>
omap (getReg b state) (fun vb =>
let (v', co) := (evalIntOp o va vb) in
Some (setCarryOpt co (setReg a v' state))))
| IOpMem _ _ o r m i =>
omap (getReg r state) (fun va =>
omap (getMem m i state) (fun vb =>
let (v', co) := (evalIntOp o va vb) in
Some (setCarryOpt co (setReg r v' state))))
| DOp _ o a b (Some x) =>
omap (getReg a state) (fun va =>
omap (getReg b state) (fun vb =>
let (low, high) := (evalDualOp o va vb) in
Some (setReg x high (setReg a low state))))
| DOp _ o a b None =>
omap (getReg a state) (fun va =>
omap (getReg b state) (fun vb =>
let (low, high) := (evalDualOp o va vb) in
Some (setReg a low state)))
| ROp _ o r i =>
omap (getReg r state) (fun v =>
let v' := (evalRotOp o v i) in
Some (setReg r v' state))
| COp _ o a b =>
omap (getReg a state) (fun va =>
omap (getReg b state) (fun vb =>
match (getCarry state) with
| None => None
| Some c0 =>
let (v', c') := (evalCarryOp o va vb c0) in
Some (setCarry c' (setReg a v' state))
end))
end.
Definition evalAssignment (a: Assignment) (state: State): option State :=
match a with
| ARegMem _ _ r m i =>
omap (getMem m i state) (fun v => Some (setReg r v state))
| AMemReg _ _ m i r =>
omap (getReg r state) (fun v => Some (setMem m i v state))
| AStackReg _ a b =>
omap (getReg b state) (fun v => Some (setStack a v state))
| ARegStack _ a b =>
omap (getStack b state) (fun v => Some (setReg a v state))
| ARegReg _ a b =>
omap (getReg b state) (fun v => Some (setReg a v state))
| AConstInt _ r c =>
Some (setReg r (constValueW c) state)
end.
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