gcc/testsuite/gcc.dg/20020523-1.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-skip-if "" { i?86-*-* } { "-m64" } { "" } } */
   6 /* { dg-options "-march=pentium3 -msse -ffast-math -O2" } */
   7
   8 extern void abort (void);
   9 extern void exit (int);
  10
  11 float one = 1.f;
  12
  13 void bar (float f)
  14 {
  15   if (__builtin_memcmp (&one, &f, sizeof (float)))
  16     abort ();
  17 }
  18
  19 float foo (void)
  20 {
  21   return 1.f;
  22 }
  23
  24 typedef struct
  25 {
  26   float t;
  27 } T;
  28
  29 void bail_if_no_sse (void)
  30 {
  31   int fl1, fl2;
  32
  33   /* See if we can use cpuid.  */
  34   __asm__ ("pushfl; pushfl; popl %0; movl %0,%1; xorl %2,%0;"
  35            "pushl %0; popfl; pushfl; popl %0; popfl"
  36            : "=&r" (fl1), "=&r" (fl2)
  37            : "i" (0x00200000));
  38   if (((fl1 ^ fl2) & 0x00200000) == 0)
  39     exit (0);
  40
  41   /* See if cpuid gives capabilities.  */
  42   __asm__ ("cpuid" : "=a" (fl1) : "0" (0) : "ebx", "ecx", "edx", "cc");
  43   if (fl1 == 0)
  44     exit (0);
  45
  46   /* See if capabilities include SSE (25th bit; 26 for SSE2).  */
  47   __asm__ ("cpuid" : "=a" (fl1), "=d" (fl2) : "0" (1) : "ebx", "ecx", "cc");
  48   if ((fl2 & (1 << 25)) == 0)
  49     exit (0);
  50 }
  51
  52 int main (void)
  53 {
  54   int i;
  55   T x[1];
  56
  57   bail_if_no_sse ();
  58   for (i = 0; i < 1; i++)
  59     {
  60       x[i].t = foo ();
  61       x[i].t = 0.f > x[i].t ? 0.f : x[i].t;
  62       bar (x[i].t);
  63     }
  64
  65   exit (0);
  66 }