Viewing file:  tree-vect.h (2.38 KB) -rw-r--r--
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/* Check if system supports SIMD */
#include <signal.h>
#if defined(__i386__) || defined(__x86_64__)
# include "cpuid.h"
#endif
#ifdef __cplusplus
extern "C" {
#endif
extern void abort (void);
extern void exit (int);
#ifdef __cplusplus
}
#endif
static void
sig_ill_handler (int sig)
{
exit(0);
}
static void __attribute__((noinline))
check_vect (void)
{
signal(SIGILL, sig_ill_handler);
#if defined(__PAIRED__)
/* 750CL paired-single instruction, 'ps_mul %v0,%v0,%v0'. */
asm volatile (".long 0x10000032");
#elif defined(__ppc__) || defined(__ppc64__) || defined(__powerpc__) || defined(powerpc)
/* Altivec instruction, 'vor %v0,%v0,%v0'. */
asm volatile (".long 0x10000484");
#elif defined(__i386__) || defined(__x86_64__)
{
unsigned int a, b, c, d,
want_level, want_b = 0, want_c = 0, want_d = 0;
/* Determine what instruction set we've been compiled for, and detect
that we're running with it. This allows us to at least do a compile
check for, e.g. SSE4.1 when the machine only supports SSE2. */
# if defined(__AVX2__)
want_level = 7, want_b = bit_AVX2;
# elif defined(__AVX__)
want_level = 1, want_c = bit_AVX;
# elif defined(__SSE4_2__)
want_level = 1, want_c = bit_SSE4_2;
# elif defined(__SSE4_1__)
want_level = 1, want_c = bit_SSE4_1;
# elif defined(__SSSE3__)
want_level = 1, want_c = bit_SSSE3;
# else
want_level = 1, want_d = bit_SSE2;
# endif
if (!__get_cpuid_count (want_level, 0, &a, &b, &c, &d)
|| ((b & want_b) | (c & want_c) | (d & want_d)) == 0)
exit (0);
}
#elif defined(__sparc__)
asm volatile (".word\t0x81b007c0");
#elif defined(__arm__)
{
/* On some processors without NEON support, this instruction may
be a no-op, on others it may trap, so check that it executes
correctly. */
long long a = 0, b = 1;
asm ("vorr %P0, %P1, %P2"
: "=w" (a)
: "0" (a), "w" (b));
if (a != 1)
exit (0);
}
#elif defined(__mips_msa)
asm volatile ("or.v $w0,$w0,$w0");
#endif
signal (SIGILL, SIG_DFL);
}
#if defined (__ARM_FEATURE_SVE)
# if __ARM_FEATURE_SVE_BITS == 0
# define VECTOR_BITS 1024
# else
# define VECTOR_BITS __ARM_FEATURE_SVE_BITS
# endif
#else
# define VECTOR_BITS 128
#endif
/* Which most of our tests are going to #define for internal use, and
which might be exposed by system headers related to signal.h on some
targets, notably VxWorks. */
#undef OFFSET
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