diff options
Diffstat (limited to 'x86/ConstpropOp.vp')
| -rw-r--r-- | x86/ConstpropOp.vp | 26 |
1 files changed, 16 insertions, 10 deletions
diff --git a/x86/ConstpropOp.vp b/x86/ConstpropOp.vp index f0000a85..be0cc09a 100644 --- a/x86/ConstpropOp.vp +++ b/x86/ConstpropOp.vp @@ -248,18 +248,24 @@ Definition make_xorimm (n: int) (r: reg) := else (Oxorimm n, r :: nil). Definition make_divimm n (r1 r2: reg) := - match Int.is_power2 n with - | Some l => if Int.ltu l (Int.repr 31) - then (Oshrximm l, r1 :: nil) - else (Odiv, r1 :: r2 :: nil) - | None => (Odiv, r1 :: r2 :: nil) - end. + if Int.eq n Int.one then + (Omove, r1 :: nil) + else + match Int.is_power2 n with + | Some l => if Int.ltu l (Int.repr 31) + then (Oshrximm l, r1 :: nil) + else (Odiv, r1 :: r2 :: nil) + | None => (Odiv, r1 :: r2 :: nil) + end. Definition make_divuimm n (r1 r2: reg) := - match Int.is_power2 n with - | Some l => (Oshruimm l, r1 :: nil) - | None => (Odivu, r1 :: r2 :: nil) - end. + if Int.eq n Int.one then + (Omove, r1 :: nil) + else + match Int.is_power2 n with + | Some l => (Oshruimm l, r1 :: nil) + | None => (Odivu, r1 :: r2 :: nil) + end. Definition make_moduimm n (r1 r2: reg) := match Int.is_power2 n with |