-- --
-- B o d y --
-- --
--- Copyright (C) 2005, Free Software Foundation, Inc. --
+-- Copyright (C) 2005-2006, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
with System; use System;
-with GNAT.Altivec.Low_Level_Interface; use GNAT.Altivec.Low_Level_Interface;
-with GNAT.Altivec.Low_Level_Vectors; use GNAT.Altivec.Low_Level_Vectors;
-
package body GNAT.Altivec.Conversions is
- function To_Varray_unsigned_char is
- new Ada.Unchecked_Conversion (Varray_signed_char,
- Varray_unsigned_char);
-
- function To_Varray_unsigned_char is
- new Ada.Unchecked_Conversion (Varray_bool_char,
- Varray_unsigned_char);
-
- function To_Varray_unsigned_short is
- new Ada.Unchecked_Conversion (Varray_signed_short,
- Varray_unsigned_short);
-
- function To_Varray_unsigned_short is
- new Ada.Unchecked_Conversion (Varray_bool_short,
- Varray_unsigned_short);
-
- function To_Varray_unsigned_short is
- new Ada.Unchecked_Conversion (Varray_pixel,
- Varray_unsigned_short);
-
- function To_Varray_unsigned_int is
- new Ada.Unchecked_Conversion (Varray_signed_int,
- Varray_unsigned_int);
-
- function To_Varray_unsigned_int is
- new Ada.Unchecked_Conversion (Varray_bool_int,
- Varray_unsigned_int);
-
- function To_Varray_unsigned_int is
- new Ada.Unchecked_Conversion (Varray_float,
- Varray_unsigned_int);
-
- function To_Varray_signed_char is
- new Ada.Unchecked_Conversion (Varray_unsigned_char,
- Varray_signed_char);
-
- function To_Varray_bool_char is
- new Ada.Unchecked_Conversion (Varray_unsigned_char,
- Varray_bool_char);
-
- function To_Varray_signed_short is
- new Ada.Unchecked_Conversion (Varray_unsigned_short,
- Varray_signed_short);
-
- function To_Varray_bool_short is
- new Ada.Unchecked_Conversion (Varray_unsigned_short,
- Varray_bool_short);
-
- function To_Varray_pixel is
- new Ada.Unchecked_Conversion (Varray_unsigned_short,
- Varray_pixel);
-
- function To_Varray_signed_int is
- new Ada.Unchecked_Conversion (Varray_unsigned_int,
- Varray_signed_int);
-
- function To_Varray_bool_int is
- new Ada.Unchecked_Conversion (Varray_unsigned_int,
- Varray_bool_int);
-
- function To_Varray_float is
- new Ada.Unchecked_Conversion (Varray_unsigned_int,
- Varray_float);
-
- function To_VUC is new Ada.Unchecked_Conversion (VUC_View, VUC);
- function To_VSC is new Ada.Unchecked_Conversion (VSC_View, VSC);
- function To_VBC is new Ada.Unchecked_Conversion (VBC_View, VBC);
- function To_VUS is new Ada.Unchecked_Conversion (VUS_View, VUS);
- function To_VSS is new Ada.Unchecked_Conversion (VSS_View, VSS);
- function To_VBS is new Ada.Unchecked_Conversion (VBS_View, VBS);
- function To_VUI is new Ada.Unchecked_Conversion (VUI_View, VUI);
- function To_VSI is new Ada.Unchecked_Conversion (VSI_View, VSI);
- function To_VBI is new Ada.Unchecked_Conversion (VBI_View, VBI);
- function To_VF is new Ada.Unchecked_Conversion (VF_View, VF);
- function To_VP is new Ada.Unchecked_Conversion (VP_View, VP);
-
- function To_VUC_View is new Ada.Unchecked_Conversion (VUC, VUC_View);
- function To_VSC_View is new Ada.Unchecked_Conversion (VSC, VSC_View);
- function To_VBC_View is new Ada.Unchecked_Conversion (VBC, VBC_View);
- function To_VUS_View is new Ada.Unchecked_Conversion (VUS, VUS_View);
- function To_VSS_View is new Ada.Unchecked_Conversion (VSS, VSS_View);
- function To_VBS_View is new Ada.Unchecked_Conversion (VBS, VBS_View);
- function To_VUI_View is new Ada.Unchecked_Conversion (VUI, VUI_View);
- function To_VSI_View is new Ada.Unchecked_Conversion (VSI, VSI_View);
- function To_VBI_View is new Ada.Unchecked_Conversion (VBI, VBI_View);
- function To_VF_View is new Ada.Unchecked_Conversion (VF, VF_View);
- function To_VP_View is new Ada.Unchecked_Conversion (VP, VP_View);
-
- pragma Warnings (Off, Default_Bit_Order);
-
- ---------------
- -- To_Vector --
- ---------------
+ -- All the vector/view conversions operate similarily: bare unchecked
+ -- conversion on big endian targets, and elements permutation on little
+ -- endian targets. We call "Mirroring" the elements permutation process.
+
+ -- We would like to provide a generic version of the conversion routines
+ -- and just have a set of "renaming as body" declarations to satisfy the
+ -- public interface. This unfortunately prevents inlining, which we must
+ -- preserve at least for the hard binding.
+
+ -- We instead provide a generic version of facilities needed by all the
+ -- conversion routines and use them repeatedly.
+
+ generic
+ type Vitem_Type is private;
+
+ type Varray_Index_Type is range <>;
+ type Varray_Type is array (Varray_Index_Type) of Vitem_Type;
+
+ type Vector_Type is private;
+ type View_Type is private;
+
+ package Generic_Conversions is
+
+ subtype Varray is Varray_Type;
+ -- This provides an easy common way to refer to the type parameter
+ -- in contexts where a specific instance of this package is "use"d.
+
+ procedure Mirror (A : Varray_Type; Into : out Varray_Type);
+ pragma Inline (Mirror);
+ -- Mirror the elements of A into INTO, not touching the per-element
+ -- internal ordering.
+
+ -- A procedure with an out parameter is a bit heavier to use than a
+ -- function but reduces the amount of temporary creations around the
+ -- call. Instances are typically not front-end inlined. They can still
+ -- be back-end inlined on request with the proper command-line option.
+
+ -- Below are Unchecked Conversion routines for various purposes,
+ -- relying on internal knowledge about the bits layout in the different
+ -- types (all 128 value bits blocks).
+
+ -- View<->Vector straight bitwise conversions on BE targets.
+
+ function UNC_To_Vector is
+ new Ada.Unchecked_Conversion (View_Type, Vector_Type);
+
+ function UNC_To_View is
+ new Ada.Unchecked_Conversion (Vector_Type, View_Type);
+
+ -- Varray->Vector/View for returning mirrored results on LE targets.
+
+ function UNC_To_Vector is
+ new Ada.Unchecked_Conversion (Varray_Type, Vector_Type);
+
+ function UNC_To_View is
+ new Ada.Unchecked_Conversion (Varray_Type, View_Type);
+
+ -- Vector/View->Varray for to-be-permuted source on LE targets.
+
+ function UNC_To_Varray is
+ new Ada.Unchecked_Conversion (Vector_Type, Varray_Type);
+
+ function UNC_To_Varray is
+ new Ada.Unchecked_Conversion (View_Type, Varray_Type);
+
+ end Generic_Conversions;
+
+ package body Generic_Conversions is
+
+ procedure Mirror (A : Varray_Type; Into : out Varray_Type) is
+ begin
+ for J in A'Range loop
+ Into (J) := A (A'Last - J + A'First);
+ end loop;
+ end Mirror;
+
+ end Generic_Conversions;
+
+ -- Now we declare the instances and implement the interface function
+ -- bodies simply calling the instantiated routines.
+
+ ---------------------
+ -- Char components --
+ ---------------------
+
+ package SC_Conversions is new Generic_Conversions
+ (signed_char, Vchar_Range, Varray_signed_char, VSC, VSC_View);
function To_Vector (S : VSC_View) return VSC is
+ use SC_Conversions;
begin
if Default_Bit_Order = High_Order_First then
- return To_VSC (S);
+ return UNC_To_Vector (S);
else
declare
- Result : LL_VUC;
- VS : constant VUC_View :=
- (Values => To_Varray_unsigned_char (S.Values));
+ M : Varray;
begin
- Result := To_Vector (VS);
- return To_LL_VSC (Result);
+ Mirror (UNC_To_Varray (S), Into => M);
+ return UNC_To_Vector (M);
end;
end if;
end To_Vector;
- function To_Vector (S : VBC_View) return VBC is
+ function To_View (S : VSC) return VSC_View is
+ use SC_Conversions;
begin
if Default_Bit_Order = High_Order_First then
- return To_VBC (S);
+ return UNC_To_View (S);
else
declare
- Result : LL_VUC;
- VS : constant VUC_View :=
- (Values => To_Varray_unsigned_char (S.Values));
+ M : Varray;
begin
- Result := To_Vector (VS);
- return To_LL_VBC (Result);
+ Mirror (UNC_To_Varray (S), Into => M);
+ return UNC_To_View (M);
end;
end if;
- end To_Vector;
+ end To_View;
- function To_Vector (S : VSS_View) return VSS is
+ --
+
+ package UC_Conversions is new Generic_Conversions
+ (unsigned_char, Vchar_Range, Varray_unsigned_char, VUC, VUC_View);
+
+ function To_Vector (S : VUC_View) return VUC is
+ use UC_Conversions;
begin
if Default_Bit_Order = High_Order_First then
- return To_VSS (S);
+ return UNC_To_Vector (S);
else
declare
- Result : LL_VUS;
- VS : constant VUS_View :=
- (Values => To_Varray_unsigned_short (S.Values));
+ M : Varray;
begin
- Result := To_Vector (VS);
- return VSS (To_LL_VSS (Result));
+ Mirror (UNC_To_Varray (S), Into => M);
+ return UNC_To_Vector (M);
end;
end if;
end To_Vector;
- function To_Vector (S : VBS_View) return VBS is
+ function To_View (S : VUC) return VUC_View is
+ use UC_Conversions;
begin
if Default_Bit_Order = High_Order_First then
- return To_VBS (S);
+ return UNC_To_View (S);
else
declare
- Result : LL_VUS;
- VS : constant VUS_View :=
- (Values => To_Varray_unsigned_short (S.Values));
+ M : Varray;
begin
- Result := To_Vector (VS);
- return To_LL_VBS (Result);
+ Mirror (UNC_To_Varray (S), Into => M);
+ return UNC_To_View (M);
end;
end if;
- end To_Vector;
+ end To_View;
- function To_Vector (S : VP_View) return VP is
+ --
+
+ package BC_Conversions is new Generic_Conversions
+ (bool_char, Vchar_Range, Varray_bool_char, VBC, VBC_View);
+
+ function To_Vector (S : VBC_View) return VBC is
+ use BC_Conversions;
begin
if Default_Bit_Order = High_Order_First then
- return To_VP (S);
+ return UNC_To_Vector (S);
else
declare
- Result : LL_VUS;
- VS : constant VUS_View :=
- (Values => To_Varray_unsigned_short (S.Values));
+ M : Varray;
begin
- Result := To_Vector (VS);
- return To_LL_VP (Result);
+ Mirror (UNC_To_Varray (S), Into => M);
+ return UNC_To_Vector (M);
end;
end if;
end To_Vector;
- function To_Vector (S : VSI_View) return VSI is
+ function To_View (S : VBC) return VBC_View is
+ use BC_Conversions;
begin
if Default_Bit_Order = High_Order_First then
- return To_VSI (S);
+ return UNC_To_View (S);
else
declare
- Result : LL_VUI;
- VS : constant VUI_View :=
- (Values => To_Varray_unsigned_int (S.Values));
+ M : Varray;
begin
- Result := To_Vector (VS);
- return To_LL_VSI (Result);
+ Mirror (UNC_To_Varray (S), Into => M);
+ return UNC_To_View (M);
end;
end if;
- end To_Vector;
+ end To_View;
- function To_Vector (S : VBI_View) return VBI is
+ ----------------------
+ -- Short components --
+ ----------------------
+
+ package SS_Conversions is new Generic_Conversions
+ (signed_short, Vshort_Range, Varray_signed_short, VSS, VSS_View);
+
+ function To_Vector (S : VSS_View) return VSS is
+ use SS_Conversions;
begin
if Default_Bit_Order = High_Order_First then
- return To_VBI (S);
+ return UNC_To_Vector (S);
else
declare
- Result : LL_VUI;
- VS : constant VUI_View :=
- (Values => To_Varray_unsigned_int (S.Values));
+ M : Varray;
begin
- Result := To_Vector (VS);
- return To_LL_VBI (Result);
+ Mirror (UNC_To_Varray (S), Into => M);
+ return UNC_To_Vector (M);
end;
end if;
end To_Vector;
- function To_Vector (S : VF_View) return VF is
+ function To_View (S : VSS) return VSS_View is
+ use SS_Conversions;
begin
if Default_Bit_Order = High_Order_First then
- return To_VF (S);
+ return UNC_To_View (S);
else
declare
- Result : LL_VUI;
- VS : constant VUI_View :=
- (Values => To_Varray_unsigned_int (S.Values));
+ M : Varray;
begin
- Result := To_Vector (VS);
- return To_LL_VF (Result);
+ Mirror (UNC_To_Varray (S), Into => M);
+ return UNC_To_View (M);
end;
end if;
- end To_Vector;
+ end To_View;
- function To_Vector (S : VUC_View) return VUC is
+ --
+
+ package US_Conversions is new Generic_Conversions
+ (unsigned_short, Vshort_Range, Varray_unsigned_short, VUS, VUS_View);
+
+ function To_Vector (S : VUS_View) return VUS is
+ use US_Conversions;
begin
if Default_Bit_Order = High_Order_First then
- return To_VUC (S);
+ return UNC_To_Vector (S);
else
declare
- Result : VUC_View;
+ M : Varray;
begin
- for J in Vchar_Range'Range loop
- Result.Values (J) :=
- S.Values (Vchar_Range'Last - J + Vchar_Range'First);
- end loop;
- return To_VUC (Result);
+ Mirror (UNC_To_Varray (S), Into => M);
+ return UNC_To_Vector (M);
end;
end if;
end To_Vector;
- function To_Vector (S : VUS_View) return VUS is
+ function To_View (S : VUS) return VUS_View is
+ use US_Conversions;
begin
if Default_Bit_Order = High_Order_First then
- return To_VUS (S);
+ return UNC_To_View (S);
else
declare
- Result : VUS_View;
+ M : Varray;
begin
- for J in Vshort_Range'Range loop
- Result.Values (J) :=
- S.Values (Vshort_Range'Last - J + Vshort_Range'First);
- end loop;
- return To_VUS (Result);
+ Mirror (UNC_To_Varray (S), Into => M);
+ return UNC_To_View (M);
end;
end if;
- end To_Vector;
+ end To_View;
- function To_Vector (S : VUI_View) return VUI is
+ --
+
+ package BS_Conversions is new Generic_Conversions
+ (bool_short, Vshort_Range, Varray_bool_short, VBS, VBS_View);
+
+ function To_Vector (S : VBS_View) return VBS is
+ use BS_Conversions;
begin
if Default_Bit_Order = High_Order_First then
- return To_VUI (S);
+ return UNC_To_Vector (S);
else
declare
- Result : VUI_View;
+ M : Varray;
begin
- for J in Vint_Range'Range loop
- Result.Values (J) :=
- S.Values (Vint_Range'Last - J + Vint_Range'First);
- end loop;
- return To_VUI (Result);
+ Mirror (UNC_To_Varray (S), Into => M);
+ return UNC_To_Vector (M);
end;
end if;
end To_Vector;
- --------------
- -- To_View --
- --------------
-
- function To_View (S : VSC) return VSC_View is
+ function To_View (S : VBS) return VBS_View is
+ use BS_Conversions;
begin
if Default_Bit_Order = High_Order_First then
- return To_VSC_View (S);
+ return UNC_To_View (S);
else
declare
- Result : VUC_View;
+ M : Varray;
begin
- Result := To_View (To_LL_VUC (S));
- return (Values => To_Varray_signed_char (Result.Values));
+ Mirror (UNC_To_Varray (S), Into => M);
+ return UNC_To_View (M);
end;
end if;
end To_View;
- function To_View (S : VBC) return VBC_View is
+ --------------------
+ -- Int components --
+ --------------------
+
+ package SI_Conversions is new Generic_Conversions
+ (signed_int, Vint_Range, Varray_signed_int, VSI, VSI_View);
+
+ function To_Vector (S : VSI_View) return VSI is
+ use SI_Conversions;
begin
if Default_Bit_Order = High_Order_First then
- return To_VBC_View (S);
+ return UNC_To_Vector (S);
else
declare
- Result : VUC_View;
+ M : Varray;
begin
- Result := To_View (To_LL_VUC (S));
- return (Values => To_Varray_bool_char (Result.Values));
+ Mirror (UNC_To_Varray (S), Into => M);
+ return UNC_To_Vector (M);
end;
end if;
- end To_View;
+ end To_Vector;
- function To_View (S : VSS) return VSS_View is
+ function To_View (S : VSI) return VSI_View is
+ use SI_Conversions;
begin
if Default_Bit_Order = High_Order_First then
- return To_VSS_View (S);
+ return UNC_To_View (S);
else
declare
- Result : VUS_View;
+ M : Varray;
begin
- Result := To_View (To_LL_VUS (S));
- return (Values => To_Varray_signed_short (Result.Values));
+ Mirror (UNC_To_Varray (S), Into => M);
+ return UNC_To_View (M);
end;
end if;
end To_View;
- function To_View (S : VBS) return VBS_View is
+ --
+
+ package UI_Conversions is new Generic_Conversions
+ (unsigned_int, Vint_Range, Varray_unsigned_int, VUI, VUI_View);
+
+ function To_Vector (S : VUI_View) return VUI is
+ use UI_Conversions;
begin
if Default_Bit_Order = High_Order_First then
- return To_VBS_View (S);
+ return UNC_To_Vector (S);
else
declare
- Result : VUS_View;
+ M : Varray;
begin
- Result := To_View (To_LL_VUS (S));
- return (Values => To_Varray_bool_short (Result.Values));
+ Mirror (UNC_To_Varray (S), Into => M);
+ return UNC_To_Vector (M);
end;
end if;
- end To_View;
+ end To_Vector;
- function To_View (S : VP) return VP_View is
+ function To_View (S : VUI) return VUI_View is
+ use UI_Conversions;
begin
if Default_Bit_Order = High_Order_First then
- return To_VP_View (S);
+ return UNC_To_View (S);
else
declare
- Result : VUS_View;
+ M : Varray;
begin
- Result := To_View (To_LL_VUS (S));
- return (Values => To_Varray_pixel (Result.Values));
+ Mirror (UNC_To_Varray (S), Into => M);
+ return UNC_To_View (M);
end;
end if;
end To_View;
- function To_View (S : VSI) return VSI_View is
+ --
+
+ package BI_Conversions is new Generic_Conversions
+ (bool_int, Vint_Range, Varray_bool_int, VBI, VBI_View);
+
+ function To_Vector (S : VBI_View) return VBI is
+ use BI_Conversions;
begin
if Default_Bit_Order = High_Order_First then
- return To_VSI_View (S);
+ return UNC_To_Vector (S);
else
declare
- Result : VUI_View;
+ M : Varray;
begin
- Result := To_View (To_LL_VUI (S));
- return (Values => To_Varray_signed_int (Result.Values));
+ Mirror (UNC_To_Varray (S), Into => M);
+ return UNC_To_Vector (M);
end;
end if;
- end To_View;
+ end To_Vector;
function To_View (S : VBI) return VBI_View is
+ use BI_Conversions;
begin
if Default_Bit_Order = High_Order_First then
- return To_VBI_View (S);
+ return UNC_To_View (S);
else
declare
- Result : VUI_View;
+ M : Varray;
begin
- Result := To_View (To_LL_VUI (S));
- return (Values => To_Varray_bool_int (Result.Values));
+ Mirror (UNC_To_Varray (S), Into => M);
+ return UNC_To_View (M);
end;
end if;
end To_View;
- function To_View (S : VF) return VF_View is
+ ----------------------
+ -- Float components --
+ ----------------------
+
+ package F_Conversions is new Generic_Conversions
+ (C_float, Vfloat_Range, Varray_float, VF, VF_View);
+
+ function To_Vector (S : VF_View) return VF is
+ use F_Conversions;
begin
if Default_Bit_Order = High_Order_First then
- return To_VF_View (S);
+ return UNC_To_Vector (S);
else
declare
- Result : VUI_View;
+ M : Varray;
begin
- Result := To_View (To_LL_VUI (S));
- return (Values => To_Varray_float (Result.Values));
+ Mirror (UNC_To_Varray (S), Into => M);
+ return UNC_To_Vector (M);
end;
end if;
- end To_View;
+ end To_Vector;
- function To_View (S : VUC) return VUC_View is
+ function To_View (S : VF) return VF_View is
+ use F_Conversions;
begin
if Default_Bit_Order = High_Order_First then
- return To_VUC_View (S);
+ return UNC_To_View (S);
else
declare
- VS : constant VUC_View := To_VUC_View (S);
- Result : VUC_View;
+ M : Varray;
begin
- for J in Vchar_Range'Range loop
- Result.Values (J) :=
- VS.Values (Vchar_Range'Last - J + Vchar_Range'First);
- end loop;
- return Result;
+ Mirror (UNC_To_Varray (S), Into => M);
+ return UNC_To_View (M);
end;
end if;
end To_View;
- function To_View (S : VUS) return VUS_View is
+ ----------------------
+ -- Pixel components --
+ ----------------------
+
+ package P_Conversions is new Generic_Conversions
+ (pixel, Vpixel_Range, Varray_pixel, VP, VP_View);
+
+ function To_Vector (S : VP_View) return VP is
+ use P_Conversions;
begin
if Default_Bit_Order = High_Order_First then
- return To_VUS_View (S);
+ return UNC_To_Vector (S);
else
declare
- VS : constant VUS_View := To_VUS_View (S);
- Result : VUS_View;
+ M : Varray;
begin
- for J in Vshort_Range'Range loop
- Result.Values (J) :=
- VS.Values (Vshort_Range'Last - J + Vshort_Range'First);
- end loop;
- return Result;
+ Mirror (UNC_To_Varray (S), Into => M);
+ return UNC_To_Vector (M);
end;
end if;
- end To_View;
+ end To_Vector;
- function To_View (S : VUI) return VUI_View is
+ function To_View (S : VP) return VP_View is
+ use P_Conversions;
begin
if Default_Bit_Order = High_Order_First then
- return To_VUI_View (S);
+ return UNC_To_View (S);
else
declare
- VS : constant VUI_View := To_VUI_View (S);
- Result : VUI_View;
+ M : Varray;
begin
- for J in Vint_Range'Range loop
- Result.Values (J) :=
- VS.Values (Vint_Range'Last - J + Vint_Range'First);
- end loop;
- return Result;
+ Mirror (UNC_To_Varray (S), Into => M);
+ return UNC_To_View (M);
end;
end if;
end To_View;