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Diffstat (limited to 'x86/CombineOp.v')
-rw-r--r-- | x86/CombineOp.v | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/x86/CombineOp.v b/x86/CombineOp.v new file mode 100644 index 00000000..34c1c9cc --- /dev/null +++ b/x86/CombineOp.v @@ -0,0 +1,150 @@ +(* *********************************************************************) +(* *) +(* The Compcert verified compiler *) +(* *) +(* Xavier Leroy, INRIA Paris *) +(* *) +(* Copyright Institut National de Recherche en Informatique et en *) +(* Automatique. All rights reserved. This file is distributed *) +(* under the terms of the INRIA Non-Commercial License Agreement. *) +(* *) +(* *********************************************************************) + +(** Recognition of combined operations, addressing modes and conditions + during the [CSE] phase. *) + +Require Import Coqlib. +Require Import AST Integers. +Require Import Op CSEdomain. + +Definition valnum := positive. + +Section COMBINE. + +Variable get: valnum -> option rhs. + +Function combine_compimm_ne_0 (x: valnum) : option(condition * list valnum) := + match get x with + | Some(Op (Ocmp c) ys) => Some (c, ys) + | Some(Op (Oandimm n) ys) => Some (Cmasknotzero n, ys) + | _ => None + end. + +Function combine_compimm_eq_0 (x: valnum) : option(condition * list valnum) := + match get x with + | Some(Op (Ocmp c) ys) => Some (negate_condition c, ys) + | Some(Op (Oandimm n) ys) => Some (Cmaskzero n, ys) + | _ => None + end. + +Function combine_compimm_eq_1 (x: valnum) : option(condition * list valnum) := + match get x with + | Some(Op (Ocmp c) ys) => Some (c, ys) + | _ => None + end. + +Function combine_compimm_ne_1 (x: valnum) : option(condition * list valnum) := + match get x with + | Some(Op (Ocmp c) ys) => Some (negate_condition c, ys) + | _ => None + end. + +Function combine_cond (cond: condition) (args: list valnum) : option(condition * list valnum) := + match cond, args with + | Ccompimm Cne n, x::nil => + if Int.eq_dec n Int.zero then combine_compimm_ne_0 x + else if Int.eq_dec n Int.one then combine_compimm_ne_1 x + else None + | Ccompimm Ceq n, x::nil => + if Int.eq_dec n Int.zero then combine_compimm_eq_0 x + else if Int.eq_dec n Int.one then combine_compimm_eq_1 x + else None + | Ccompuimm Cne n, x::nil => + if Int.eq_dec n Int.zero then combine_compimm_ne_0 x + else if Int.eq_dec n Int.one then combine_compimm_ne_1 x + else None + | Ccompuimm Ceq n, x::nil => + if Int.eq_dec n Int.zero then combine_compimm_eq_0 x + else if Int.eq_dec n Int.one then combine_compimm_eq_1 x + else None + | _, _ => None + end. + +Function combine_addr_32 (addr: addressing) (args: list valnum) : option(addressing * list valnum) := + match addr, args with + | Aindexed n, x::nil => + match get x with + | Some(Op (Olea a) ys) => + match offset_addressing a n with Some a' => Some (a', ys) | None => None end + | _ => None + end + | _, _ => None + end. + +Function combine_addr_64 (addr: addressing) (args: list valnum) : option(addressing * list valnum) := + match addr, args with + | Aindexed n, x::nil => + match get x with + | Some(Op (Oleal a) ys) => + match offset_addressing a n with Some a' => Some (a', ys) | None => None end + | _ => None + end + | _, _ => None + end. + +Definition combine_addr (addr: addressing) (args: list valnum) : option(addressing * list valnum) := + if Archi.ptr64 then combine_addr_64 addr args else combine_addr_32 addr args. + +Function combine_op (op: operation) (args: list valnum) : option(operation * list valnum) := + match op, args with + | Olea addr, _ => + match combine_addr_32 addr args with + | Some(addr', args') => Some(Olea addr', args') + | None => None + end + | Oleal addr, _ => + match combine_addr_64 addr args with + | Some(addr', args') => Some(Oleal addr', args') + | None => None + end + | Oandimm n, x :: nil => + match get x with + | Some(Op (Oandimm m) ys) => Some(Oandimm (Int.and m n), ys) + | _ => None + end + | Oorimm n, x :: nil => + match get x with + | Some(Op (Oorimm m) ys) => Some(Oorimm (Int.or m n), ys) + | _ => None + end + | Oxorimm n, x :: nil => + match get x with + | Some(Op (Oxorimm m) ys) => Some(Oxorimm (Int.xor m n), ys) + | _ => None + end + | Oandlimm n, x :: nil => + match get x with + | Some(Op (Oandlimm m) ys) => Some(Oandlimm (Int64.and m n), ys) + | _ => None + end + | Oorlimm n, x :: nil => + match get x with + | Some(Op (Oorlimm m) ys) => Some(Oorlimm (Int64.or m n), ys) + | _ => None + end + | Oxorlimm n, x :: nil => + match get x with + | Some(Op (Oxorlimm m) ys) => Some(Oxorlimm (Int64.xor m n), ys) + | _ => None + end + | Ocmp cond, _ => + match combine_cond cond args with + | Some(cond', args') => Some(Ocmp cond', args') + | None => None + end + | _, _ => None + end. + +End COMBINE. + + |