87 lines
3.2 KiB
OCaml
87 lines
3.2 KiB
OCaml
(**************************************************************************)
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(* *)
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(* OCaml *)
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(* *)
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(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
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(* *)
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(* Copyright 1996 Institut National de Recherche en Informatique et *)
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(* en Automatique. *)
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(* *)
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(* All rights reserved. This file is distributed under the terms of *)
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(* the GNU Lesser General Public License version 2.1, with the *)
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(* special exception on linking described in the file LICENSE. *)
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(* *)
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(**************************************************************************)
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open Cmm
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open Arch
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open Reg
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open Mach
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(* Reloading for the Intel x86 *)
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let stackp r =
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match r.loc with
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Stack _ -> true
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| _ -> false
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class reload = object (self)
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inherit Reloadgen.reload_generic as super
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method! makereg r =
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match r.typ with
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Float -> r
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| _ -> super#makereg r
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(* By overriding makereg, we make sure that pseudoregs of type float
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will never be reloaded. Hence there is no need to make special cases for
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floating-point operations. *)
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method! reload_operation op arg res =
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match op with
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Iintop(Iadd|Isub|Iand|Ior|Ixor|Icomp _|Icheckbound) ->
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(* One of the two arguments can reside in the stack *)
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if stackp arg.(0) && stackp arg.(1)
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then ([|arg.(0); self#makereg arg.(1)|], res)
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else (arg, res)
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| Iintop(Imul) ->
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(* First argument (and destination) must be in register,
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second arg can reside in stack *)
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if stackp arg.(0)
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then let r = self#makereg arg.(0) in ([|r; arg.(1)|], [|r|])
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else (arg, res)
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| Iintop_imm(Iadd, _) when arg.(0).loc <> res.(0).loc ->
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(* This add will be turned into a lea; args and results must be
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in registers *)
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super#reload_operation op arg res
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| Iintop_imm(Imul, _) ->
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(* First argument and destination must be in register *)
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if stackp arg.(0)
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then let r = self#makereg arg.(0) in ([|r|], [|r|])
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else (arg, res)
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| Iintop(Imulh | Ilsl | Ilsr | Iasr) | Iintop_imm(_, _)
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| Ifloatofint | Iintoffloat | Ispecific(Ipush) ->
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(* The argument(s) can be either in register or on stack *)
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(* Note: Imulh: arg(0 and res(0) already forced in regs
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Ilsl, Ilsr, Iasr: arg(1) already forced in regs *)
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(arg, res)
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| _ -> (* Other operations: all args and results in registers *)
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super#reload_operation op arg res
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method! reload_test tst arg =
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match tst with
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Iinttest _ ->
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(* One of the two arguments can reside on stack *)
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if stackp arg.(0) && stackp arg.(1)
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then [| self#makereg arg.(0); arg.(1) |]
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else arg
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| _ ->
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(* The argument(s) can be either in register or on stack *)
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arg
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end
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let fundecl f =
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(new reload)#fundecl f
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