gcc/ada/exp_fixd.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                             E X P _ F I X D                              --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --                                                                          --
  10 --        Copyright (C) 1992,1993,1994 Free Software Foundation, Inc.       --
  11 --                                                                          --
  12 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  13 -- terms of the  GNU General Public License as published  by the Free Soft- --
  14 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  15 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  16 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  17 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  20 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  21 -- MA 02111-1307, USA.                                                      --
  22 --                                                                          --
  23 -- GNAT was originally developed  by the GNAT team at  New York University. --
  24 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  25 --                                                                          --
  26 ------------------------------------------------------------------------------
  27
  28 --  Expand routines for fixed-point convert, divide and multiply operations
  29
  30 with Types; use Types;
  31
  32 package Exp_Fixd is
  33
  34    --  General note on universal fixed. In the routines below, a fixed-point
  35    --  type is always a specific fixed-point type or universal real, never
  36    --  universal fixed. Universal fixed only appears as the result type of a
  37    --  division or multplication and in all such cases, the parent node, which
  38    --  must be either a conversion node or a 'Round attribute reference node,
  39    --  has the specific type information. In both cases, the parent node is
  40    --  removed from the tree, and the appropriate routine in this package is
  41    --  called with a multiply or divide node with all types (and also possibly
  42    --  the Rounded_Result flag) set.
  43
  44    ----------------------------
  45    -- Fixed-Point Conversion --
  46    ----------------------------
  47
  48    procedure Expand_Convert_Fixed_To_Fixed (N : Node_Id);
  49    --  This routine expands the conversion of one fixed-point type to another,
  50    --  N is the N_Op_Conversion node with the result and expression types (and
  51    --  possibly the Rounded_Result flag) set.
  52
  53    procedure Expand_Convert_Fixed_To_Float (N : Node_Id);
  54    --  This routine expands the conversion from a fixed-point type to a
  55    --  floating-point type. N is an N_Type_Conversion node with the result
  56    --  and expression types set.
  57
  58    procedure Expand_Convert_Fixed_To_Integer (N : Node_Id);
  59    --  This routine expands the conversion from a fixed-point type to an
  60    --  integer type. N is an N_Type_Conversion node with the result and
  61    --  operand types set.
  62
  63    procedure Expand_Convert_Float_To_Fixed (N : Node_Id);
  64    --  This routine expands the conversion from a floating-point type to
  65    --  a fixed-point type. N is an N_Type_Conversion node with the result
  66    --  and operand types (and possibly the Rounded_Result flag) set.
  67
  68    procedure Expand_Convert_Integer_To_Fixed (N : Node_Id);
  69    --  This routine expands the conversion from an integer type to a
  70    --  fixed-point type. N is an N_Type_Conversion node with the result
  71    --  and operand types (and possibly the Rounded_Result flag) set.
  72
  73    --------------------------
  74    -- Fixed-Point Division --
  75    --------------------------
  76
  77    procedure Expand_Decimal_Divide_Call (N : Node_Id);
  78    --  This routine expands a call to the procedure Decimal.Divide. The
  79    --  argument N is the N_Function_Call node.
  80
  81    procedure Expand_Divide_Fixed_By_Fixed_Giving_Fixed (N : Node_Id);
  82    --  This routine expands the division between fixed-point types, with
  83    --  a fixed-point type result. N is an N_Op_Divide node with operand
  84    --  and result types (and possibly the Rounded_Result flag) set. Either
  85    --  (but not both) of the operands may be universal real.
  86
  87    procedure Expand_Divide_Fixed_By_Fixed_Giving_Float (N : Node_Id);
  88    --  This routine expands the division between two fixed-point types with
  89    --  a floating-point result. N is an N_Op_Divide node with the result
  90    --  and operand types set. Either (but not both) of the operands may be
  91    --  universal real.
  92
  93    procedure Expand_Divide_Fixed_By_Fixed_Giving_Integer (N : Node_Id);
  94    --  This routine expands the division between two fixed-point types with
  95    --  an integer type result. N is an N_Op_Divide node with the result and
  96    --  operand types set. Either (but not both) of the operands may be
  97    --  universal real.
  98
  99    procedure Expand_Divide_Fixed_By_Integer_Giving_Fixed (N : Node_Id);
 100    --  This routine expands the division between a fixed-point type and
 101    --  standard integer type. The result type is the same fixed-point type
 102    --  as the operand type. N is an N_Op_Divide node with the result and
 103    --  left operand types being the fixed-point type, and the right operand
 104    --  type being standard integer (and possibly Rounded_Result set).
 105
 106    --------------------------------
 107    -- Fixed-Point Multiplication --
 108    --------------------------------
 109
 110    procedure Expand_Multiply_Fixed_By_Fixed_Giving_Fixed (N : Node_Id);
 111    --  This routine expands the multiplication between fixed-point types
 112    --  with a fixed-point type result. N is an N_Op_Multiply node with the
 113    --  result and operand types set. Either (but not both) of the operands
 114    --  may be universal real.
 115
 116    procedure Expand_Multiply_Fixed_By_Fixed_Giving_Float (N : Node_Id);
 117    --  This routine expands the multiplication between two fixed-point types
 118    --  with a floating-point result. N is an N_Op_Multiply node with the
 119    --  result and operand types set. Either (but not both) of the operands
 120    --  may be universal real.
 121
 122    procedure Expand_Multiply_Fixed_By_Fixed_Giving_Integer (N : Node_Id);
 123    --  This routine expands the multiplication between two fixed-point types
 124    --  with an integer result. N is an N_Op_Multiply node with the result
 125    --  and operand types set. Either (but not both) of the operands may be
 126    --  be universal real.
 127
 128    procedure Expand_Multiply_Fixed_By_Integer_Giving_Fixed (N : Node_Id);
 129    --  This routine expands the multiplication between a fixed-point type and
 130    --  a standard integer type. The result type is the same fixed-point type
 131    --  as the fixed operand type. N is an N_Op_Multiply node whose result type
 132    --  and left operand types are the fixed-point type, and whose right operand
 133    --  type is always standard integer.
 134
 135    procedure Expand_Multiply_Integer_By_Fixed_Giving_Fixed (N : Node_Id);
 136    --  This routine expands the multiplication between standard integer and a
 137    --  fixed-point type. The result type is the same fixed-point type as the
 138    --  the fixed operand type. N is an N_Op_Multiply node whose result type
 139    --  and right operand types are the fixed-point type, and whose left operand
 140    --  type is always standard integer.
 141
 142 end Exp_Fixd;