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/**
* @file cpu_feature.c
* @brief CPU feature detection (CPU ID)
* @author Patrick Roth - roth@stettbacher.ch
* @copyright Stettbacher Signal Processing AG
*
* @remarks
*
* <PRE>
* This 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.
*
* This 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
* </PRE>
*
*/
#if __x86_64__
#include <stdio.h>
#include <cpuid.h>
#include <stdint.h>
#include "cpu_feature.h"
// level 1
static int cpu_feature_sse;
static int cpu_feature_sse2;
static int cpu_feature_sse3;
static int cpu_feature_ssse3;
static int cpu_feature_fma;
static int cpu_feature_avx;
// level 7
static int cpu_feature_avx2;
/**
* Check whether given CPU feature is available or not.
*
* @param type CPU feature type to check
* @return not 0 if available, 0 if not
*/
int cpu_feature_support(enum cpu_feature_t type) {
/*
* Any CPU feature is disabled on 32 bit machine.
*/
switch(type) {
case CPU_FEATURE_SSE: return cpu_feature_sse;
case CPU_FEATURE_SSE2: return cpu_feature_sse2;
case CPU_FEATURE_SSE3: return cpu_feature_sse3;
case CPU_FEATURE_SSSE3: return cpu_feature_ssse3;
case CPU_FEATURE_FMA: return cpu_feature_fma;
case CPU_FEATURE_AVX: return cpu_feature_avx;
case CPU_FEATURE_AVX2: return cpu_feature_avx2;
}
return 0;
}
/**
* Initialize CPU features detection like MMX, SSE, SSE2, AVX etc.
* This function read and handles the CPU IDs.
*
* @return 0 on success otherwise -1
*/
int cpu_feature_init(void) {
unsigned int cpuid_basic, /*cpuid_highest, */sig;
unsigned int eax, ebx, ecx, edx;
cpuid_basic = __get_cpuid_max(0, &sig);
if(cpuid_basic == 0) {
printf("%s: Basic CPUID is not supported\n", __func__);
return -1;
}
// cpuid_highest = __get_cpuid_max(0x8000000, NULL);
if(cpuid_basic >= 1) {
__cpuid_count(1, 0, eax, ebx, ecx, edx);
cpu_feature_sse = (edx & bit_SSE) != 0 ? 1:0;
cpu_feature_sse2 = (edx & bit_SSE2) != 0 ? 1:0;
cpu_feature_sse3 = (ecx & bit_SSE3) != 0 ? 1:0;
cpu_feature_ssse3 = (ecx & bit_SSSE3) != 0 ? 1:0;
cpu_feature_fma = (ecx & bit_FMA) != 0 ? 1:0;
cpu_feature_avx = (ecx & bit_AVX) != 0 ? 1:0;
}
if(cpuid_basic >= 7) {
__cpuid_count(7, 0, eax, ebx, ecx, edx);
cpu_feature_avx2 = (ebx & bit_AVX2) != 0 ? 1:0;
}
// printf("%s: SSE %s\n", __func__, cpu_feature_sse != 0 ? "yes":"no");
// printf("%s: SSE2 %s\n", __func__, cpu_feature_sse2 != 0 ? "yes":"no");
// printf("%s: SSE3 %s\n", __func__, cpu_feature_sse3 != 0 ? "yes":"no");
// printf("%s: SSSE3 %s\n", __func__, cpu_feature_ssse3 != 0 ? "yes":"no");
// printf("%s: FMA %s\n", __func__, cpu_feature_fma != 0 ? "yes":"no");
// printf("%s: AVX %s\n", __func__, cpu_feature_avx != 0 ? "yes":"no");
// printf("%s: AVX2 %s\n", __func__, cpu_feature_avx2 != 0 ? "yes":"no");
return 0;
}
#endif // __x86_64__
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