gcc/testsuite/gcc.dg/20020523-2.c

   1 /* PR target/6753
   2    This testcase was miscompiled because sse_mov?fcc_const0*
   3    patterns were missing earlyclobber.  */
   4 /* { dg-do run { target i386-*-* } } */
   5 /* { dg-options "-march=pentium3 -msse -ffast-math -O2" } */
   6
   7 extern void abort (void);
   8 extern void exit (int);
   9
  10 float one = 1.f;
  11
  12 void bar (float f)
  13 {
  14   if (__builtin_memcmp (&one, &f, sizeof (float)))
  15     abort ();
  16 }
  17
  18 float foo (void)
  19 {
  20   return 1.f;
  21 }
  22
  23 typedef struct
  24 {
  25   float t;
  26 } T;
  27
  28 void bail_if_no_sse (void)
  29 {
  30   int fl1, fl2;
  31
  32   /* See if we can use cpuid.  */
  33   __asm__ ("pushfl; pushfl; popl %0; movl %0,%1; xorl %2,%0;"
  34            "pushl %0; popfl; pushfl; popl %0; popfl"
  35            : "=&r" (fl1), "=&r" (fl2)
  36            : "i" (0x00200000));
  37   if (((fl1 ^ fl2) & 0x00200000) == 0)
  38     exit (0);
  39
  40   /* See if cpuid gives capabilities.  */
  41   __asm__ ("cpuid" : "=a" (fl1) : "0" (0) : "ebx", "ecx", "edx", "cc");
  42   if (fl1 == 0)
  43     exit (0);
  44
  45   /* See if capabilities include SSE (25th bit; 26 for SSE2).  */
  46   __asm__ ("cpuid" : "=a" (fl1), "=d" (fl2) : "0" (1) : "ebx", "ecx", "cc");
  47   if ((fl2 & (1 << 25)) == 0)
  48     exit (0);
  49 }
  50
  51 int main (void)
  52 {
  53   int i;
  54   T x[1];
  55
  56   bail_if_no_sse ();
  57   for (i = 0; i < 1; i++)
  58     {
  59       x[i].t = foo ();
  60       x[i].t = 0.f > x[i].t ? 0.f : x[i].t;
  61       bar (x[i].t);
  62     }
  63
  64   exit (0);
  65 }