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[smlnj] View of /sml/trunk/src/compiler/CodeGen/ppc/ppcPseudoInstr.sml
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View of /sml/trunk/src/compiler/CodeGen/ppc/ppcPseudoInstr.sml

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Revision 411 - (download) (annotate)
Fri Sep 3 00:25:03 1999 UTC (21 years ago) by monnier
Original Path: sml/branches/SMLNJ/src/compiler/CodeGen/ppc/ppcPseudoInstr.sml
File size: 961 byte(s)
version 110.19
functor PPCPseudoInstr
  (structure Instr : PPCINSTR
     where Region = CPSRegions) : PPC_PSEUDO_INSTR = 
struct
  structure I = Instr
  structure C = Instr.C

  val stack = CPSRegions.stack
  val cvti2dTmpOff = 16			(* runtime system dependent *)
  val cvti2dConstOff = 8		(*            ''             *)
  val sp = C.stackptrR

  (* Cute little trick -- go figure *)
  fun cvti2d{reg, fd} = let
    val tmpR = C.newReg()
    val tmpF = C.newFreg()
  in
    [I.ARITHI{oper=I.XORIS, rt=tmpR, ra=reg, im=I.ImmedOp 32768},
     I.ST{st=I.STW, rs=tmpR, ra=sp, d=I.ImmedOp(cvti2dTmpOff+4), mem=stack},
     I.ARITHI{oper=I.ADDIS, rt=tmpR, ra=0, im=I.ImmedOp(0x4330)},
     I.ST{st=I.STW, rs=tmpR, ra=sp, d=I.ImmedOp(cvti2dTmpOff), mem=stack},
     I.LF{ld=I.LFD, ft=fd, ra=sp, d=I.ImmedOp(cvti2dTmpOff), mem=stack},
     I.LF{ld=I.LFD, ft=tmpF, ra=sp, d=I.ImmedOp(cvti2dConstOff), mem=stack},
     I.FARITH{oper=I.FSUB, ft=fd, fa=fd, fb=tmpF, Rc=false}]
  end
end

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