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 --        Copyright (C) 1992,1993,1994 Free Software Foundation, Inc.       --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- GNAT was originally developed  by the GNAT team at  New York University. --
  23 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  24 --                                                                          --
  25 ------------------------------------------------------------------------------
  26
  27 --  Expand routines for fixed-point convert, divide and multiply operations
  28
  29 with Types; use Types;
  30
  31 package Exp_Fixd is
  32
  33    --  General note on universal fixed. In the routines below, a fixed-point
  34    --  type is always a specific fixed-point type or universal real, never
  35    --  universal fixed. Universal fixed only appears as the result type of a
  36    --  division or multplication and in all such cases, the parent node, which
  37    --  must be either a conversion node or a 'Round attribute reference node,
  38    --  has the specific type information. In both cases, the parent node is
  39    --  removed from the tree, and the appropriate routine in this package is
  40    --  called with a multiply or divide node with all types (and also possibly
  41    --  the Rounded_Result flag) set.
  42
  43    ----------------------------
  44    -- Fixed-Point Conversion --
  45    ----------------------------
  46
  47    procedure Expand_Convert_Fixed_To_Fixed (N : Node_Id);
  48    --  This routine expands the conversion of one fixed-point type to another,
  49    --  N is the N_Op_Conversion node with the result and expression types (and
  50    --  possibly the Rounded_Result flag) set.
  51
  52    procedure Expand_Convert_Fixed_To_Float (N : Node_Id);
  53    --  This routine expands the conversion from a fixed-point type to a
  54    --  floating-point type. N is an N_Type_Conversion node with the result
  55    --  and expression types set.
  56
  57    procedure Expand_Convert_Fixed_To_Integer (N : Node_Id);
  58    --  This routine expands the conversion from a fixed-point type to an
  59    --  integer type. N is an N_Type_Conversion node with the result and
  60    --  operand types set.
  61
  62    procedure Expand_Convert_Float_To_Fixed (N : Node_Id);
  63    --  This routine expands the conversion from a floating-point type to
  64    --  a fixed-point type. N is an N_Type_Conversion node with the result
  65    --  and operand types (and possibly the Rounded_Result flag) set.
  66
  67    procedure Expand_Convert_Integer_To_Fixed (N : Node_Id);
  68    --  This routine expands the conversion from an integer type to a
  69    --  fixed-point type. N is an N_Type_Conversion node with the result
  70    --  and operand types (and possibly the Rounded_Result flag) set.
  71
  72    --------------------------
  73    -- Fixed-Point Division --
  74    --------------------------
  75
  76    procedure Expand_Decimal_Divide_Call (N : Node_Id);
  77    --  This routine expands a call to the procedure Decimal.Divide. The
  78    --  argument N is the N_Function_Call node.
  79
  80    procedure Expand_Divide_Fixed_By_Fixed_Giving_Fixed (N : Node_Id);
  81    --  This routine expands the division between fixed-point types, with
  82    --  a fixed-point type result. N is an N_Op_Divide node with operand
  83    --  and result types (and possibly the Rounded_Result flag) set. Either
  84    --  (but not both) of the operands may be universal real.
  85
  86    procedure Expand_Divide_Fixed_By_Fixed_Giving_Float (N : Node_Id);
  87    --  This routine expands the division between two fixed-point types with
  88    --  a floating-point result. N is an N_Op_Divide node with the result
  89    --  and operand types set. Either (but not both) of the operands may be
  90    --  universal real.
  91
  92    procedure Expand_Divide_Fixed_By_Fixed_Giving_Integer (N : Node_Id);
  93    --  This routine expands the division between two fixed-point types with
  94    --  an integer type result. N is an N_Op_Divide node with the result and
  95    --  operand types set. Either (but not both) of the operands may be
  96    --  universal real.
  97
  98    procedure Expand_Divide_Fixed_By_Integer_Giving_Fixed (N : Node_Id);
  99    --  This routine expands the division between a fixed-point type and
 100    --  standard integer type. The result type is the same fixed-point type
 101    --  as the operand type. N is an N_Op_Divide node with the result and
 102    --  left operand types being the fixed-point type, and the right operand
 103    --  type being standard integer (and possibly Rounded_Result set).
 104
 105    --------------------------------
 106    -- Fixed-Point Multiplication --
 107    --------------------------------
 108
 109    procedure Expand_Multiply_Fixed_By_Fixed_Giving_Fixed (N : Node_Id);
 110    --  This routine expands the multiplication between fixed-point types
 111    --  with a fixed-point type result. N is an N_Op_Multiply node with the
 112    --  result and operand types set. Either (but not both) of the operands
 113    --  may be universal real.
 114
 115    procedure Expand_Multiply_Fixed_By_Fixed_Giving_Float (N : Node_Id);
 116    --  This routine expands the multiplication between two fixed-point types
 117    --  with a floating-point result. N is an N_Op_Multiply node with the
 118    --  result and operand types set. Either (but not both) of the operands
 119    --  may be universal real.
 120
 121    procedure Expand_Multiply_Fixed_By_Fixed_Giving_Integer (N : Node_Id);
 122    --  This routine expands the multiplication between two fixed-point types
 123    --  with an integer result. N is an N_Op_Multiply node with the result
 124    --  and operand types set. Either (but not both) of the operands may be
 125    --  be universal real.
 126
 127    procedure Expand_Multiply_Fixed_By_Integer_Giving_Fixed (N : Node_Id);
 128    --  This routine expands the multiplication between a fixed-point type and
 129    --  a standard integer type. The result type is the same fixed-point type
 130    --  as the fixed operand type. N is an N_Op_Multiply node whose result type
 131    --  and left operand types are the fixed-point type, and whose right operand
 132    --  type is always standard integer.
 133
 134    procedure Expand_Multiply_Integer_By_Fixed_Giving_Fixed (N : Node_Id);
 135    --  This routine expands the multiplication between standard integer and a
 136    --  fixed-point type. The result type is the same fixed-point type as the
 137    --  the fixed operand type. N is an N_Op_Multiply node whose result type
 138    --  and right operand types are the fixed-point type, and whose left operand
 139    --  type is always standard integer.
 140
 141 end Exp_Fixd;