tree-vect.h

来自「用于进行gcc测试」· C头文件 代码 · 共 42 行

/* Check if system supports SIMD */
#include <signal.h>

extern void abort (void);
extern void exit (int);

void
sig_ill_handler (int sig)
{
  exit(0);
}

void 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__)
  /* SSE2 instruction: movsd %xmm0,%xmm0 */
  asm volatile (".byte 0xf2,0x0f,0x10,0xc0");
#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);
  }
#endif
  signal (SIGILL, SIG_DFL);
}