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/* helper functions for Highway
*
* 29/07/21 kleisauke
* - from vector.c
*/
/*
This file is part of VIPS.
VIPS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <glib/gi18n-lib.h>
#include <stdlib.h>
#include <math.h>
#include <vips/vips.h>
#include <vips/vector.h>
#include <vips/debug.h>
#include <vips/internal.h>
/* If we are building with -fcf-protection (run-time checking of
* indirect jumps) then Orc won't work. Make sure it's off.
*
* https://gcc.gnu.org/onlinedocs/gcc/\
* Instrumentation-Options.html#index-fcf-protection
* https://gitlab.freedesktop.org/gstreamer/orc/issues/17
*
* orc 0.4.30 and later work with cf-protection.
*/
#ifdef __CET__
#ifndef HAVE_ORC_CF_PROTECTION
#undef HAVE_ORC
#endif
#endif
#ifdef HAVE_HWY
#include <hwy/highway.h>
#elif defined(HAVE_ORC)
#include <orc/orc.h>
#endif /*HAVE_HWY*/
/* Cleared by the command-line `--vips-novector` switch and the
* `VIPS_NOVECTOR` env var.
*/
gboolean vips__vector_enabled = TRUE;
void
vips__vector_init(void)
{
#ifdef HAVE_ORC
orc_init();
#endif /*HAVE_ORC*/
/* Check whether any features are being disabled by the environment.
*/
const char *env;
if ((env = g_getenv("VIPS_VECTOR")))
return vips_vector_disable_targets(
g_ascii_strtoll(env, NULL, 0));
/* Look for the deprecated IM_NOVECTOR environment variable as well.
*/
if (g_getenv("VIPS_NOVECTOR")
#if ENABLE_DEPRECATED
|| g_getenv("IM_NOVECTOR")
#endif
)
vips__vector_enabled = FALSE;
}
gboolean
vips_vector_isenabled(void)
{
#ifdef HAVE_HWY
return vips__vector_enabled && vips_vector_get_supported_targets() != 0;
#elif defined(HAVE_ORC)
return vips__vector_enabled;
#else
return FALSE;
#endif
}
void
vips_vector_set_enabled(gboolean enabled)
{
vips__vector_enabled = enabled;
}
/**
* vips_vector_get_builtin_targets:
*
* Gets a bitfield of builtin targets that libvips was built with.
*
* Returns: a bitfield of builtin targets.
*/
gint64
vips_vector_get_builtin_targets(void)
{
#ifdef HAVE_HWY
return HWY_TARGETS;
#else
return 0;
#endif
}
/**
* vips_vector_get_supported_targets:
*
* Gets a bitfield of enabled targets that are supported on this CPU. The
* targets returned may change after calling vips_vector_disable_targets().
*
* Returns: a bitfield of supported CPU targets.
*/
gint64
vips_vector_get_supported_targets(void)
{
#ifdef HAVE_HWY
return hwy::SupportedTargets() & ~(HWY_EMU128 | HWY_SCALAR);
#elif defined(HAVE_ORC)
return orc_target_get_default_flags(orc_target_get_default());
#else
return 0;
#endif
}
/**
* vips_vector_target_name:
* @target: A specific target to describe.
*
* Generates a human-readable ASCII string descriptor for a specific target.
*
* Returns: a string describing the target.
*/
const char *
vips_vector_target_name(gint64 target)
{
#ifdef HAVE_HWY
return hwy::TargetName(target);
#elif defined(HAVE_ORC)
return orc_target_get_flag_name(orc_target_get_default(),
log2(target));
#else
return NULL;
#endif
}
/**
* vips_vector_disable_targets:
* @disabled_targets: A bitfield of targets to disable at runtime.
*
* Takes a bitfield of targets to disable on the runtime platform.
* Handy for testing and benchmarking purposes.
*
* This can also be set using the `VIPS_VECTOR` environment variable.
*/
void
vips_vector_disable_targets(gint64 disabled_targets)
{
#ifdef HAVE_HWY
hwy::SetSupportedTargetsForTest(
vips_vector_get_supported_targets() & ~disabled_targets);
#endif
}
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