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/*
* Copyright (c) 2016 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef included_clib_cpu_h
#define included_clib_cpu_h
#include <vppinfra/format.h>
/*
* multiarchitecture support. Adding new entry will produce
* new graph node function variant optimized for specific cpu
* microarchitecture.
* Order is important for runtime selection, as 1st match wins...
*/
#if __x86_64__ && CLIB_DEBUG == 0
#define foreach_march_variant(macro, x) \
macro(avx2, x, "arch=core-avx2")
#else
#define foreach_march_variant(macro, x)
#endif
#if __GNUC__ > 4 && !__clang__
#define CLIB_CPU_OPTIMIZED __attribute__ ((optimize ("tree-vectorize")))
#else
#define CLIB_CPU_OPTIMIZED
#endif
#define CLIB_MULTIARCH_ARCH_CHECK(arch, fn, tgt) \
if (clib_cpu_supports_ ## arch()) \
return & fn ## _ ##arch;
#define CLIB_MULTIARCH_SELECT_FN(fn,...) \
__VA_ARGS__ void * fn ## _multiarch_select(void) \
{ \
foreach_march_variant(CLIB_MULTIARCH_ARCH_CHECK, fn) \
return & fn; \
}
#ifdef CLIB_MULTIARCH_VARIANT
#define __CLIB_MULTIARCH_FN(a,b) a##_##b
#define _CLIB_MULTIARCH_FN(a,b) __CLIB_MULTIARCH_FN(a,b)
#define CLIB_MULTIARCH_FN(fn) _CLIB_MULTIARCH_FN(fn,CLIB_MULTIARCH_VARIANT)
#else
#define CLIB_MULTIARCH_FN(fn) fn
#endif
#define foreach_x86_64_flags \
_ (sse3, 1, ecx, 0) \
_ (ssse3, 1, ecx, 9) \
_ (sse41, 1, ecx, 19) \
_ (sse42, 1, ecx, 20) \
_ (avx, 1, ecx, 28) \
_ (avx2, 7, ebx, 5) \
_ (avx512f, 7, ebx, 16) \
_ (aes, 1, ecx, 25) \
_ (sha, 7, ebx, 29) \
_ (invariant_tsc, 0x80000007, edx, 8)
#if defined(__x86_64__)
#include "cpuid.h"
static inline int
clib_get_cpuid (const u32 lev, u32 * eax, u32 * ebx, u32 * ecx, u32 * edx)
{
if ((u32) __get_cpuid_max (0x80000000 & lev, 0) < lev)
return 0;
if (lev == 7)
__cpuid_count (lev, 0, *eax, *ebx, *ecx, *edx);
else
__cpuid (lev, *eax, *ebx, *ecx, *edx);
return 1;
}
#define _(flag, func, reg, bit) \
static inline int \
clib_cpu_supports_ ## flag() \
{ \
u32 __attribute__((unused)) eax, ebx = 0, ecx = 0, edx = 0; \
clib_get_cpuid (func, &eax, &ebx, &ecx, &edx); \
\
return ((reg & (1 << bit)) != 0); \
}
foreach_x86_64_flags
#undef _
#else
#define _(flag, func, reg, bit) \
static inline int clib_cpu_supports_ ## flag() { return 0; }
foreach_x86_64_flags
#undef _
#endif
#endif
format_function_t format_cpu_uarch;
format_function_t format_cpu_model_name;
format_function_t format_cpu_flags;
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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