62 lines
2.0 KiB
OCaml
62 lines
2.0 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. All rights reserved. This file is distributed *)
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(* under the terms of the Q Public License version 1.0. *)
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(* *)
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(***********************************************************************)
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(* Instruction scheduling for the Power PC *)
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open Arch
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open Mach
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class scheduler = object
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inherit Schedgen.scheduler_generic
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(* Latencies (in cycles). Based roughly on the "common model". *)
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method oper_latency = function
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Ireload -> 2
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| Iload(_, _) -> 2
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| Iconst_float _ -> 2 (* turned into a load *)
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| Iconst_symbol _ -> 1
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| Iintop(Imul | Imulh) -> 9
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| Iintop_imm(Imul, _) -> 5
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| Iintop(Idiv | Imod) -> 36
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| Iaddf | Isubf -> 4
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| Imulf -> 5
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| Idivf -> 33
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| Ispecific(Imultaddf | Imultsubf) -> 5
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| _ -> 1
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method reload_retaddr_latency = 12
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(* If we can have that many cycles between the reloadretaddr and the
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return, we can expect that the blr branch will be completely folded. *)
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(* Issue cycles. Rough approximations. *)
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method oper_issue_cycles = function
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Iconst_float _ | Iconst_symbol _ -> 2
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| Iload(_, Ibased(_, _)) -> 2
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| Istore(_, Ibased(_, _), _) -> 2
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| Ialloc _ -> 4
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| Iintop(Imod) -> 40 (* assuming full stall *)
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| Iintop(Icomp _) -> 4
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| Iintop_imm(Icomp _, _) -> 4
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| Ifloatofint -> 9
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| Iintoffloat -> 4
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| _ -> 1
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method reload_retaddr_issue_cycles = 3
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(* load then stalling mtlr *)
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end
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let fundecl f = (new scheduler)#schedule_fundecl f
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