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#include "config.h"
#include "cpu_caps.h"
#ifdef HAVE_INTRIN_H
#include <intrin.h>
#endif
#ifdef HAVE_CPUID_H
#include <cpuid.h>
#endif
#include <cctype>
#include <string>
#include "alfstream.h"
#include "logging.h"
int CPUCapFlags{0};
namespace {
#if defined(HAVE_GCC_GET_CPUID) \
&& (defined(__i386__) || defined(__x86_64__) || defined(_M_IX86) || defined(_M_X64))
using reg_type = unsigned int;
inline void get_cpuid(unsigned int f, reg_type *regs)
{ __get_cpuid(f, ®s[0], ®s[1], ®s[2], ®s[3]); }
#define CAN_GET_CPUID
#elif defined(HAVE_CPUID_INTRINSIC) \
&& (defined(__i386__) || defined(__x86_64__) || defined(_M_IX86) || defined(_M_X64))
using reg_type = int;
inline void get_cpuid(unsigned int f, reg_type *regs)
{ (__cpuid)(regs, f); }
#define CAN_GET_CPUID
#endif
} // namespace
void FillCPUCaps(int capfilter)
{
int caps{0};
/* FIXME: We really should get this for all available CPUs in case different
* CPUs have different caps (is that possible on one machine?).
*/
#ifdef CAN_GET_CPUID
union {
reg_type regs[4];
char str[sizeof(reg_type[4])];
} cpuinf[3]{};
get_cpuid(0, cpuinf[0].regs);
if(cpuinf[0].regs[0] == 0)
ERR("Failed to get CPUID\n");
else
{
const reg_type maxfunc{cpuinf[0].regs[0]};
get_cpuid(0x80000000, cpuinf[0].regs);
const reg_type maxextfunc{cpuinf[0].regs[0]};
TRACE("Detected max CPUID function: 0x%x (ext. 0x%x)\n", maxfunc, maxextfunc);
TRACE("Vendor ID: \"%.4s%.4s%.4s\"\n", cpuinf[0].str+4, cpuinf[0].str+12, cpuinf[0].str+8);
if(maxextfunc >= 0x80000004)
{
get_cpuid(0x80000002, cpuinf[0].regs);
get_cpuid(0x80000003, cpuinf[1].regs);
get_cpuid(0x80000004, cpuinf[2].regs);
TRACE("Name: \"%.16s%.16s%.16s\"\n", cpuinf[0].str, cpuinf[1].str, cpuinf[2].str);
}
if(maxfunc >= 1)
{
get_cpuid(1, cpuinf[0].regs);
if((cpuinf[0].regs[3]&(1<<25)))
caps |= CPU_CAP_SSE;
if((caps&CPU_CAP_SSE) && (cpuinf[0].regs[3]&(1<<26)))
caps |= CPU_CAP_SSE2;
if((caps&CPU_CAP_SSE2) && (cpuinf[0].regs[2]&(1<<0)))
caps |= CPU_CAP_SSE3;
if((caps&CPU_CAP_SSE3) && (cpuinf[0].regs[2]&(1<<19)))
caps |= CPU_CAP_SSE4_1;
}
}
#else
/* Assume support for whatever's supported if we can't check for it */
#if defined(HAVE_SSE4_1)
#warning "Assuming SSE 4.1 run-time support!"
caps |= CPU_CAP_SSE | CPU_CAP_SSE2 | CPU_CAP_SSE3 | CPU_CAP_SSE4_1;
#elif defined(HAVE_SSE3)
#warning "Assuming SSE 3 run-time support!"
caps |= CPU_CAP_SSE | CPU_CAP_SSE2 | CPU_CAP_SSE3;
#elif defined(HAVE_SSE2)
#warning "Assuming SSE 2 run-time support!"
caps |= CPU_CAP_SSE | CPU_CAP_SSE2;
#elif defined(HAVE_SSE)
#warning "Assuming SSE run-time support!"
caps |= CPU_CAP_SSE;
#endif
#endif
#ifdef HAVE_NEON
#ifdef __ARM_NEON
caps |= CPU_CAP_NEON;
#else
al::ifstream file{"/proc/cpuinfo"};
if(!file.is_open())
ERR("Failed to open /proc/cpuinfo, cannot check for NEON support\n");
else
{
std::string features;
auto getline = [](std::istream &f, std::string &output) -> bool
{
while(f.good() && f.peek() == '\n')
f.ignore();
return std::getline(f, output) && !output.empty();
};
while(getline(file, features))
{
if(features.compare(0, 10, "Features\t:", 10) == 0)
break;
}
file.close();
size_t extpos{9};
while((extpos=features.find("neon", extpos+1)) != std::string::npos)
{
if(std::isspace(features[extpos-1])
&& (extpos+4 == features.length() || std::isspace(features[extpos+4])))
{
caps |= CPU_CAP_NEON;
break;
}
}
if(!(caps&CPU_CAP_NEON))
{
extpos = 9;
while((extpos=features.find("asimd", extpos+1)) != std::string::npos)
{
if(std::isspace(features[extpos-1])
&& (extpos+5 == features.length() || std::isspace(features[extpos+5])))
{
caps |= CPU_CAP_NEON;
break;
}
}
}
}
#endif
#endif
TRACE("Extensions:%s%s%s%s%s%s\n",
((capfilter&CPU_CAP_SSE) ? ((caps&CPU_CAP_SSE) ? " +SSE" : " -SSE") : ""),
((capfilter&CPU_CAP_SSE2) ? ((caps&CPU_CAP_SSE2) ? " +SSE2" : " -SSE2") : ""),
((capfilter&CPU_CAP_SSE3) ? ((caps&CPU_CAP_SSE3) ? " +SSE3" : " -SSE3") : ""),
((capfilter&CPU_CAP_SSE4_1) ? ((caps&CPU_CAP_SSE4_1) ? " +SSE4.1" : " -SSE4.1") : ""),
((capfilter&CPU_CAP_NEON) ? ((caps&CPU_CAP_NEON) ? " +NEON" : " -NEON") : ""),
((!capfilter) ? " -none-" : "")
);
CPUCapFlags = caps & capfilter;
}
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