| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- G N A T . A L T I V E C . C O N V E R S I O N S -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 2005-2009, 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- -- |
| -- ware Foundation; either version 3, or (at your option) any later ver- -- |
| -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- |
| -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- |
| -- or FITNESS FOR A PARTICULAR PURPOSE. -- |
| -- -- |
| -- As a special exception under Section 7 of GPL version 3, you are granted -- |
| -- additional permissions described in the GCC Runtime Library Exception, -- |
| -- version 3.1, as published by the Free Software Foundation. -- |
| -- -- |
| -- You should have received a copy of the GNU General Public License and -- |
| -- a copy of the GCC Runtime Library Exception along with this program; -- |
| -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- |
| -- <http://www.gnu.org/licenses/>. -- |
| -- -- |
| -- GNAT was originally developed by the GNAT team at New York University. -- |
| -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| with Ada.Unchecked_Conversion; |
| |
| with System; use System; |
| |
| package body GNAT.Altivec.Conversions is |
| |
| -- All the vector/view conversions operate similarly: 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 UNC_To_Vector (S); |
| else |
| declare |
| M : Varray; |
| begin |
| Mirror (UNC_To_Varray (S), Into => M); |
| return UNC_To_Vector (M); |
| end; |
| end if; |
| end To_Vector; |
| |
| function To_View (S : VSC) return VSC_View is |
| use SC_Conversions; |
| begin |
| if Default_Bit_Order = High_Order_First then |
| return UNC_To_View (S); |
| else |
| declare |
| M : Varray; |
| begin |
| Mirror (UNC_To_Varray (S), Into => M); |
| return UNC_To_View (M); |
| end; |
| end if; |
| end To_View; |
| |
| -- |
| |
| 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 UNC_To_Vector (S); |
| else |
| declare |
| M : Varray; |
| begin |
| Mirror (UNC_To_Varray (S), Into => M); |
| return UNC_To_Vector (M); |
| end; |
| end if; |
| end To_Vector; |
| |
| function To_View (S : VUC) return VUC_View is |
| use UC_Conversions; |
| begin |
| if Default_Bit_Order = High_Order_First then |
| return UNC_To_View (S); |
| else |
| declare |
| M : Varray; |
| begin |
| Mirror (UNC_To_Varray (S), Into => M); |
| return UNC_To_View (M); |
| end; |
| end if; |
| end To_View; |
| |
| -- |
| |
| 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 UNC_To_Vector (S); |
| else |
| declare |
| M : Varray; |
| begin |
| Mirror (UNC_To_Varray (S), Into => M); |
| return UNC_To_Vector (M); |
| end; |
| end if; |
| end To_Vector; |
| |
| function To_View (S : VBC) return VBC_View is |
| use BC_Conversions; |
| begin |
| if Default_Bit_Order = High_Order_First then |
| return UNC_To_View (S); |
| else |
| declare |
| M : Varray; |
| begin |
| Mirror (UNC_To_Varray (S), Into => M); |
| return UNC_To_View (M); |
| end; |
| end if; |
| end To_View; |
| |
| ---------------------- |
| -- 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 UNC_To_Vector (S); |
| else |
| declare |
| M : Varray; |
| begin |
| Mirror (UNC_To_Varray (S), Into => M); |
| return UNC_To_Vector (M); |
| end; |
| end if; |
| end To_Vector; |
| |
| function To_View (S : VSS) return VSS_View is |
| use SS_Conversions; |
| begin |
| if Default_Bit_Order = High_Order_First then |
| return UNC_To_View (S); |
| else |
| declare |
| M : Varray; |
| begin |
| Mirror (UNC_To_Varray (S), Into => M); |
| return UNC_To_View (M); |
| end; |
| end if; |
| end To_View; |
| |
| -- |
| |
| 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 UNC_To_Vector (S); |
| else |
| declare |
| M : Varray; |
| begin |
| Mirror (UNC_To_Varray (S), Into => M); |
| return UNC_To_Vector (M); |
| end; |
| end if; |
| end To_Vector; |
| |
| function To_View (S : VUS) return VUS_View is |
| use US_Conversions; |
| begin |
| if Default_Bit_Order = High_Order_First then |
| return UNC_To_View (S); |
| else |
| declare |
| M : Varray; |
| begin |
| Mirror (UNC_To_Varray (S), Into => M); |
| return UNC_To_View (M); |
| end; |
| end if; |
| end To_View; |
| |
| -- |
| |
| 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 UNC_To_Vector (S); |
| else |
| declare |
| M : Varray; |
| begin |
| Mirror (UNC_To_Varray (S), Into => M); |
| return UNC_To_Vector (M); |
| end; |
| end if; |
| end To_Vector; |
| |
| function To_View (S : VBS) return VBS_View is |
| use BS_Conversions; |
| begin |
| if Default_Bit_Order = High_Order_First then |
| return UNC_To_View (S); |
| else |
| declare |
| M : Varray; |
| begin |
| Mirror (UNC_To_Varray (S), Into => M); |
| return UNC_To_View (M); |
| end; |
| end if; |
| end To_View; |
| |
| -------------------- |
| -- 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 UNC_To_Vector (S); |
| else |
| declare |
| M : Varray; |
| begin |
| Mirror (UNC_To_Varray (S), Into => M); |
| return UNC_To_Vector (M); |
| end; |
| end if; |
| end To_Vector; |
| |
| function To_View (S : VSI) return VSI_View is |
| use SI_Conversions; |
| begin |
| if Default_Bit_Order = High_Order_First then |
| return UNC_To_View (S); |
| else |
| declare |
| M : Varray; |
| begin |
| Mirror (UNC_To_Varray (S), Into => M); |
| return UNC_To_View (M); |
| end; |
| end if; |
| end To_View; |
| |
| -- |
| |
| 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 UNC_To_Vector (S); |
| else |
| declare |
| M : Varray; |
| begin |
| Mirror (UNC_To_Varray (S), Into => M); |
| return UNC_To_Vector (M); |
| end; |
| end if; |
| end To_Vector; |
| |
| function To_View (S : VUI) return VUI_View is |
| use UI_Conversions; |
| begin |
| if Default_Bit_Order = High_Order_First then |
| return UNC_To_View (S); |
| else |
| declare |
| M : Varray; |
| begin |
| Mirror (UNC_To_Varray (S), Into => M); |
| return UNC_To_View (M); |
| end; |
| end if; |
| end To_View; |
| |
| -- |
| |
| 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 UNC_To_Vector (S); |
| else |
| declare |
| M : Varray; |
| begin |
| Mirror (UNC_To_Varray (S), Into => M); |
| return UNC_To_Vector (M); |
| end; |
| end if; |
| 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 UNC_To_View (S); |
| else |
| declare |
| M : Varray; |
| begin |
| Mirror (UNC_To_Varray (S), Into => M); |
| return UNC_To_View (M); |
| end; |
| end if; |
| end To_View; |
| |
| ---------------------- |
| -- 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 UNC_To_Vector (S); |
| else |
| declare |
| M : Varray; |
| begin |
| Mirror (UNC_To_Varray (S), Into => M); |
| return UNC_To_Vector (M); |
| end; |
| end if; |
| end To_Vector; |
| |
| function To_View (S : VF) return VF_View is |
| use F_Conversions; |
| begin |
| if Default_Bit_Order = High_Order_First then |
| return UNC_To_View (S); |
| else |
| declare |
| M : Varray; |
| begin |
| Mirror (UNC_To_Varray (S), Into => M); |
| return UNC_To_View (M); |
| end; |
| end if; |
| end To_View; |
| |
| ---------------------- |
| -- 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 UNC_To_Vector (S); |
| else |
| declare |
| M : Varray; |
| begin |
| Mirror (UNC_To_Varray (S), Into => M); |
| return UNC_To_Vector (M); |
| end; |
| end if; |
| end To_Vector; |
| |
| function To_View (S : VP) return VP_View is |
| use P_Conversions; |
| begin |
| if Default_Bit_Order = High_Order_First then |
| return UNC_To_View (S); |
| else |
| declare |
| M : Varray; |
| begin |
| Mirror (UNC_To_Varray (S), Into => M); |
| return UNC_To_View (M); |
| end; |
| end if; |
| end To_View; |
| |
| end GNAT.Altivec.Conversions; |
