mirror of
https://git.code.sf.net/p/libpng/code.git
synced 2025-07-10 18:04:09 +02:00
e4a31f024b
In the previous commit 9e538750d99c8f1accf7e93878e4fde47c069908 we removed the obsolete assembler implementation `filter_neon.S`. In this commit we add a stand-in for the original file, restoring the original source tree structure, for the benefit of continuing hassle-free libpng source upgrades in the 1.6.x line.
62 lines
2.1 KiB
ArmAsm
62 lines
2.1 KiB
ArmAsm
|
|
/* filter_neon.S - placeholder file
|
|
*
|
|
* Copyright (c) 2024 Cosmin Truta
|
|
*
|
|
* This code is released under the libpng license.
|
|
* For conditions of distribution and use, see the disclaimer
|
|
* and license in png.h
|
|
*/
|
|
|
|
/* IMPORTANT NOTE:
|
|
*
|
|
* Historically, the hand-coded assembler implementation of Neon optimizations
|
|
* in this module had not been in sync with the intrinsics-based implementation
|
|
* in filter_neon_intrinsics.c and palette_neon_intrinsics.c, at least since
|
|
* the introduction of riffled palette optimizations. Moreover, the assembler
|
|
* code used to work on 32-bit ARM only, and it caused problems, even if empty,
|
|
* on 64-bit ARM.
|
|
*
|
|
* All references to this module from our internal build scripts and projects
|
|
* have been removed.
|
|
*
|
|
* For the external projects that might still expect this module to be present,
|
|
* we leave this stub in place, for the remaining lifetime of libpng-1.6.x.
|
|
* Everything should continue to function normally, as long as there are no
|
|
* deliberate attempts to use the old hand-made assembler code. A build error
|
|
* will be raised otherwise.
|
|
*/
|
|
|
|
/* This is required to get the symbol renames, which are #defines, and the
|
|
* definitions (or not) of PNG_ARM_NEON_OPT and PNG_ARM_NEON_IMPLEMENTATION.
|
|
*/
|
|
#define PNG_VERSION_INFO_ONLY
|
|
#include "../pngpriv.h"
|
|
|
|
#ifdef PNG_READ_SUPPORTED
|
|
#if PNG_ARM_NEON_IMPLEMENTATION == 2 /* hand-coded assembler */
|
|
#if PNG_ARM_NEON_OPT > 0
|
|
|
|
#if defined(__clang__)
|
|
#define GNUC_VERSION 0 /* not gcc, although it might pretend to be */
|
|
#elif defined(__GNUC__)
|
|
#define GNUC_MAJOR (__GNUC__ + 0)
|
|
#define GNUC_MINOR (__GNUC_MINOR__ + 0)
|
|
#define GNUC_PATCHLEVEL (__GNUC_PATCHLEVEL__ + 0)
|
|
#define GNUC_VERSION (GNUC_MAJOR * 10000 + GNUC_MINOR * 100 + GNUC_PATCHLEVEL)
|
|
#else
|
|
#define GNUC_VERSION 0 /* not gcc */
|
|
#endif
|
|
|
|
#if (GNUC_VERSION > 0) && (GNUC_VERSION < 40300)
|
|
#error "PNG_ARM_NEON is not supported with gcc versions earlier than 4.3.0"
|
|
#elif GNUC_VERSION == 40504
|
|
#error "PNG_ARM_NEON is not supported with gcc version 4.5.4"
|
|
#else
|
|
#error "Please use 'arm/*_neon_intrinsics.c' for PNG_ARM_NEON support"
|
|
#endif
|
|
|
|
#endif /* PNG_ARM_NEON_OPT > 0 */
|
|
#endif /* PNG_ARM_NEON_IMPLEMENTATION == 2 */
|
|
#endif /* READ */
|