instrset.h File Reference

#include <stdlib.h>

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Classes
class	Const_int_t< n >
class	Const_uint_t< n >
class	Static_error_check< bool >
class	Static_error_check< false >

Macros
#define	INSTRSET_H   116
#define	INSTRSET   0
#define	const_int(n)   (Const_int_t <n>())
#define	const_uint(n)   (Const_uint_t<n>())

Typedefs
typedef signed char	int8_t
typedef unsigned char	uint8_t
typedef signed short int	int16_t
typedef unsigned short int	uint16_t
typedef signed int	int32_t
typedef unsigned int	uint32_t
typedef long long	int64_t
typedef unsigned long long	uint64_t
typedef int32_t	intptr_t

Functions
int	instrset_detect (void)
bool	hasFMA3 (void)
bool	hasFMA4 (void)
bool	hasXOP (void)

Macro Definition Documentation

#define const_int

(

n

)

(Const_int_t <n>())

Definition at line 191 of file instrset.h.

#define const_uint

(

n

)

(Const_uint_t<n>())

Definition at line 192 of file instrset.h.

#define INSTRSET   0

Definition at line 52 of file instrset.h.

#define INSTRSET_H   116

Definition at line 21 of file instrset.h.

Typedef Documentation

typedef signed short int int16_t

Definition at line 139 of file instrset.h.

typedef signed int int32_t

Definition at line 141 of file instrset.h.

typedef long long int64_t

Definition at line 143 of file instrset.h.

typedef signed char int8_t

Definition at line 137 of file instrset.h.

typedef int32_t intptr_t

Definition at line 148 of file instrset.h.

typedef unsigned short int uint16_t

Definition at line 140 of file instrset.h.

typedef unsigned int uint32_t

Definition at line 142 of file instrset.h.

typedef unsigned long long uint64_t

Definition at line 144 of file instrset.h.

typedef unsigned char uint8_t

Definition at line 138 of file instrset.h.

Function Documentation

bool hasFMA3

(

void

)

Definition at line 133 of file instrset_detect.cpp.

                   {
    if (instrset_detect() < 7) return false;               // must have AVX
    int abcd[4];                                           // cpuid results
    cpuid(abcd, 1);                                        // call cpuid function 1
    return ((abcd[2] & (1 << 12)) != 0);                   // ecx bit 12 indicates FMA3
}

bool hasFMA4

(

void

)

Definition at line 141 of file instrset_detect.cpp.

                   {
    if (instrset_detect() < 7) return false;               // must have AVX
    int abcd[4];                                           // cpuid results
    cpuid(abcd, 0x80000001);                               // call cpuid function 0x80000001
    return ((abcd[2] & (1 << 16)) != 0);                   // ecx bit 16 indicates FMA4
}

bool hasXOP

(

void

)

Definition at line 149 of file instrset_detect.cpp.

                  {
    if (instrset_detect() < 7) return false;               // must have AVX
    int abcd[4];                                           // cpuid results
    cpuid(abcd, 0x80000001);                               // call cpuid function 0x80000001
    return ((abcd[2] & (1 << 11)) != 0);                   // ecx bit 11 indicates XOP
}

int instrset_detect

(

void

)

Definition at line 91 of file instrset_detect.cpp.

                          {

    static int iset = -1;                                  // remember value for next call
    if (iset >= 0) {
        return iset;                                       // called before
    }
    iset = 0;                                              // default value
    int abcd[4] = {0,0,0,0};                               // cpuid results
    cpuid(abcd, 0);                                        // call cpuid function 0
    if (abcd[0] == 0) return iset;                         // no further cpuid function supported
    cpuid(abcd, 1);                                        // call cpuid function 1 for feature flags
    if ((abcd[3] & (1 <<  0)) == 0) return iset;           // no floating point
    if ((abcd[3] & (1 << 23)) == 0) return iset;           // no MMX
    if ((abcd[3] & (1 << 15)) == 0) return iset;           // no conditional move
    if ((abcd[3] & (1 << 24)) == 0) return iset;           // no FXSAVE
    if ((abcd[3] & (1 << 25)) == 0) return iset;           // no SSE
    iset = 1;                                              // 1: SSE supported
    if ((abcd[3] & (1 << 26)) == 0) return iset;           // no SSE2
    iset = 2;                                              // 2: SSE2 supported
    if ((abcd[2] & (1 <<  0)) == 0) return iset;           // no SSE3
    iset = 3;                                              // 3: SSE3 supported
    if ((abcd[2] & (1 <<  9)) == 0) return iset;           // no SSSE3
    iset = 4;                                              // 4: SSSE3 supported
    if ((abcd[2] & (1 << 19)) == 0) return iset;           // no SSE4.1
    iset = 5;                                              // 5: SSE4.1 supported
    if ((abcd[2] & (1 << 23)) == 0) return iset;           // no POPCNT
    if ((abcd[2] & (1 << 20)) == 0) return iset;           // no SSE4.2
    iset = 6;                                              // 6: SSE4.2 supported
    if ((abcd[2] & (1 << 27)) == 0) return iset;           // no OSXSAVE
    if ((xgetbv(0) & 6) != 6)       return iset;           // AVX not enabled in O.S.
    if ((abcd[2] & (1 << 28)) == 0) return iset;           // no AVX
    iset = 7;                                              // 7: AVX supported
    cpuid(abcd, 7);                                        // call cpuid leaf 7 for feature flags
    if ((abcd[1] & (1 <<  5)) == 0) return iset;           // no AVX2
    iset = 8;                                              // 8: AVX2 supported
    cpuid(abcd, 0xD);                                      // call cpuid leaf 0xD for feature flags
    if ((abcd[0] & 0x60) != 0x60)   return iset;           // no AVX512
    iset = 9;                                              // 8: AVX512F supported
    return iset;
}