Remove dead code in base64.c

neon vectorization for base64

A similar algorithm is used to vectorize on x86_64, with a good description in
https://arxiv.org/abs/1704.00605 . On AArch64 the implementation differs in t

neon vectorization for base64

A similar algorithm is used to vectorize on x86_64, with a good description in
https://arxiv.org/abs/1704.00605 . On AArch64 the implementation differs in that
instead of using multiplies to shift bits around, it uses the vld3+vst4 and
vld4+vst3 combinations to load and store interleaved data. This patch is based
on the NEON implementation of Wojciech Mula:
https://github.com/WojciechMula/base64simd/blob/master/encode/encode.neon.cpp
https://github.com/WojciechMula/base64simd/blob/master/encode/lookup.neon.cpp
and
https://github.com/WojciechMula/base64simd/blob/master/encode/encode.neon.cpp
https://github.com/WojciechMula/base64simd/blob/master/encode/encode.neon.cpp
adapted to php/ext/standard/base64.c and vectorized with factor 16 instead of 8.

On a Graviton A1 instance and on the synthetic benchmarks in
https://github.com/lemire/fastbase64 I see 175% speedup on base64 encoding and
60% speedup on base64 decode compared to the scalar implementation.

The patch passes `make test` regression testing on aarch64-linux.

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Mark ifunc resolver functions as unused

It looks like clang doesn't see that these are used through
__attribute__((ifunc)) and generates a warning.

Make ABI of SIMD optimized functions independent of compiler flags

Always export these as normal functions and only use function pointers
internally if necessary.

Remove local variables

This patch removes the so called local variables defined per
file basis for certain editors to properly show tab width, and
similar settings. These are mainly

Remove local variables

This patch removes the so called local variables defined per
file basis for certain editors to properly show tab width, and
similar settings. These are mainly used by Vim and Emacs editors
yet with recent changes the once working definitions don't work
anymore in Vim without custom plugins or additional configuration.
Neither are these settings synced across the PHP code base.

A simpler and better approach is EditorConfig and fixing code
using some code style fixing tools in the future instead.

This patch also removes the so called modelines for Vim. Modelines
allow Vim editor specifically to set some editor configuration such as
syntax highlighting, indentation style and tab width to be set in the
first line or the last 5 lines per file basis. Since the php test
files have syntax highlighting already set in most editors properly and
EditorConfig takes care of the indentation settings, this patch removes
these as well for the Vim 6.0 and newer versions.

With the removal of local variables for certain editors such as
Emacs and Vim, the footer is also probably not needed anymore when
creating extensions using ext_skel.php script.

Additionally, Vim modelines for setting php syntax and some editor
settings has been removed from some *.phpt files. All these are
mostly not relevant for phpt files neither work properly in the
middle of the file.

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Remove yearly range from copyright notice

Add additional no_sanitize_address attributes

To fix bug #77447 in release mode as well.

Remove unnecessary base64_encode() return value check

php_base64_encode() never returns NULL, so base64_encode() will never return
false.

Fix typos in code comments

Remove unused Git attributes ident

The $Id$ keywords were used in Subversion where they can be substituted
with filename, last revision number change, last changed date, and last
use

Remove unused Git attributes ident

The $Id$ keywords were used in Subversion where they can be substituted
with filename, last revision number change, last changed date, and last
user who changed it.

In Git this functionality is different and can be done with Git attribute
ident. These need to be defined manually for each file in the
.gitattributes file and are afterwards replaced with 40-character
hexadecimal blob object name which is based only on the particular file
contents.

This patch simplifies handling of $Id$ keywords by removing them since
they are not used anymore.

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Avoid useless checks, using zend_string_efree(), in cases where the string is known to be a temporary allocated zend_string.

Combines common codes

Attempt to fix build again

seems if a cpu supports avx2 but not ssse3, the build will fail. but how
could that possible... :<

Attempt to fix build reported fails in containers

Fix possible int overflow on vars used in loop with size_t counter

Update author info

Optimized base64_encode/decode with SIMD instructions

year++

year++

year++

Provide zend_string wrappers for php_base64_(en|de)code

Also pull existing php_base64_decode() proxy out to an inline.
Bump PHP_API_VERSION for ABI change.

Update copyright headers to 2017

Update copyright headers to 2017

Update copyright headers to 2017

Use new param API in standard