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/* IFUNC resolver with CPU_FEATURE_ACTIVE.
Copyright (C) 2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library 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 2.1 of the License, or (at your option) any later version.
The GNU C Library 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 the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <sys/platform/x86.h>
enum isa
{
none,
sse2,
sse4_2,
avx,
avx2,
avx512f
};
enum isa
__attribute__ ((__optimize__ ("-fno-stack-protector")))
get_isa (void)
{
if (CPU_FEATURE_ACTIVE (AVX512F))
return avx512f;
if (CPU_FEATURE_ACTIVE (AVX2))
return avx2;
if (CPU_FEATURE_ACTIVE (AVX))
return avx;
if (CPU_FEATURE_ACTIVE (SSE4_2))
return sse4_2;
if (CPU_FEATURE_ACTIVE (SSE2))
return sse2;
return none;
}
static int
isa_sse2 (void)
{
return sse2;
}
static int
isa_sse4_2 (void)
{
return sse4_2;
}
static int
isa_avx (void)
{
return avx;
}
static int
isa_avx2 (void)
{
return avx2;
}
static int
isa_avx512f (void)
{
return avx512f;
}
static int
isa_none (void)
{
return none;
}
int foo (void) __attribute__ ((ifunc ("foo_ifunc")));
void *
__attribute__ ((__optimize__ ("-fno-stack-protector")))
foo_ifunc (void)
{
switch (get_isa ())
{
case avx512f:
return isa_avx512f;
case avx2:
return isa_avx2;
case avx:
return isa_avx;
case sse4_2:
return isa_sse4_2;
case sse2:
return isa_sse2;
default:
break;
}
return isa_none;
}
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