From 76ea1108be6f8b4ba9dc0118a13f685bcb62bc2b Mon Sep 17 00:00:00 2001 From: xleroy Date: Sat, 14 Sep 2013 16:24:30 +0000 Subject: Floats.v, Nan.v: hard-wire the general shape of binop_pl, so that no axioms are necessary, only two parameters (default_pl and choose_binop_pl). SelectDiv: optimize FP division by a power of 2. ConstpropOp: optimize 2.0 * x and x * 2.0 into x + x. git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@2326 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e --- ia32/SelectOp.vp | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) (limited to 'ia32/SelectOp.vp') diff --git a/ia32/SelectOp.vp b/ia32/SelectOp.vp index 209147e..1471405 100644 --- a/ia32/SelectOp.vp +++ b/ia32/SelectOp.vp @@ -334,7 +334,18 @@ Definition absf (e: expr) := Eop Oabsf (e ::: Enil). Definition addf (e1 e2: expr) := Eop Oaddf (e1 ::: e2 ::: Enil). Definition subf (e1 e2: expr) := Eop Osubf (e1 ::: e2 ::: Enil). Definition mulf (e1 e2: expr) := Eop Omulf (e1 ::: e2 ::: Enil). -Definition divf (e1 e2: expr) := Eop Odivf (e1 ::: e2 ::: Enil). + +Definition divfimm (e: expr) (n: float) := + match Float.exact_inverse n with + | Some n' => Eop Omulf (e ::: Eop (Ofloatconst n') Enil ::: Enil) + | None => Eop Odivf (e ::: Eop (Ofloatconst n) Enil ::: Enil) + end. + +Nondetfunction divf (e1: expr) (e2: expr) := + match e2 with + | Eop (Ofloatconst n2) Enil => divfimm e1 n2 + | _ => Eop Odivf (e1 ::: e2 ::: Enil) + end. (** ** Comparisons *) -- cgit v1.2.3