gcc/testsuite/gcc.dg/i386-cpuid.h

   1 /* Helper file for i386 platform.  Runtime check for MMX/SSE/SSE2 support.
   2    Used by 20020523-2.c and i386-sse-6.c, and possibly others.  */
   3 /* Plagarized from 20020523-2.c.  */
   4
   5 /* %ecx */
   6 #define bit_SSE3 (1 << 0)
   7 #define bit_SSSE3 (1 << 9)
   8
   9 /* %edx */
  10 #define bit_CMOV (1 << 15)
  11 #define bit_MMX (1 << 23)
  12 #define bit_SSE (1 << 25)
  13 #define bit_SSE2 (1 << 26)
  14
  15 #ifndef NOINLINE
  16 #define NOINLINE __attribute__ ((noinline))
  17 #endif
  18
  19 static inline unsigned int
  20 i386_get_cpuid (unsigned int *ecx, unsigned int *edx)
  21 {
  22   int fl1;
  23
  24 #ifndef __x86_64__
  25   int fl2;
  26
  27   /* See if we can use cpuid.  On AMD64 we always can.  */
  28   __asm__ ("pushfl; pushfl; popl %0; movl %0,%1; xorl %2,%0;"
  29            "pushl %0; popfl; pushfl; popl %0; popfl"
  30            : "=&r" (fl1), "=&r" (fl2)
  31            : "i" (0x00200000));
  32   if (((fl1 ^ fl2) & 0x00200000) == 0)
  33     return (0);
  34 #endif
  35
  36   /* Host supports cpuid.  See if cpuid gives capabilities, try
  37      CPUID(0).  Preserve %ebx and %ecx; cpuid insn clobbers these, we
  38      don't need their CPUID values here, and %ebx may be the PIC
  39      register.  */
  40 #ifdef __x86_64__
  41   __asm__ ("pushq %%rcx; pushq %%rbx; cpuid; popq %%rbx; popq %%rcx"
  42            : "=a" (fl1) : "0" (0) : "rdx", "cc");
  43 #else
  44   __asm__ ("pushl %%ecx; pushl %%ebx; cpuid; popl %%ebx; popl %%ecx"
  45            : "=a" (fl1) : "0" (0) : "edx", "cc");
  46 #endif
  47   if (fl1 == 0)
  48     return (0);
  49
  50   /* Invoke CPUID(1), return %ecx and %edx; caller can examine bits to
  51      determine what's supported.  */
  52 #ifdef __x86_64__
  53   __asm__ ("pushq %%rbx; cpuid; popq %%rbx"
  54            : "=c" (*ecx), "=d" (*edx), "=a" (fl1) : "2" (1) : "cc");
  55 #else
  56   __asm__ ("pushl %%ebx; cpuid; popl %%ebx"
  57            : "=c" (*ecx), "=d" (*edx), "=a" (fl1) : "2" (1) : "cc");
  58 #endif
  59
  60   return 1;
  61 }
  62
  63 unsigned int i386_cpuid_ecx (void) NOINLINE;
  64 unsigned int i386_cpuid_edx (void) NOINLINE;
  65
  66 unsigned int NOINLINE
  67 i386_cpuid_ecx (void)
  68 {
  69   unsigned int ecx, edx;
  70   if (i386_get_cpuid (&ecx, &edx))
  71     return ecx;
  72   else
  73     return 0;
  74 }
  75
  76 unsigned int NOINLINE
  77 i386_cpuid_edx (void)
  78 {
  79   unsigned int ecx, edx;
  80   if (i386_get_cpuid (&ecx, &edx))
  81     return edx;
  82   else
  83     return 0;
  84 }
  85
  86 static inline unsigned int
  87 i386_cpuid (void)
  88 {
  89   return i386_cpuid_edx ();
  90 }