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-skip-if "" { i?86-*-* } { "-m64" } { "" } } */
   6 /* { dg-options "-march=pentium3 -msse -ffast-math -O2" } */
   7
   8 #include "i386-cpuid.h"
   9 extern void abort (void);
  10 extern void exit (int);
  11
  12 float one = 1.f;
  13
  14 void bar (float f)
  15 {
  16   if (__builtin_memcmp (&one, &f, sizeof (float)))
  17     abort ();
  18 }
  19
  20 float foo (void)
  21 {
  22   return 1.f;
  23 }
  24
  25 typedef struct
  26 {
  27   float t;
  28 } T;
  29
  30 void bail_if_no_sse (void)
  31 {
  32   unsigned int edx;
  33   /* See if capabilities include SSE (25th bit; 26 for SSE2).  */
  34   edx = i386_cpuid();
  35   if (!(edx & bit_SSE))
  36     exit (0);
  37 }
  38
  39 int main (void)
  40 {
  41   int i;
  42   T x[1];
  43
  44   bail_if_no_sse ();
  45   for (i = 0; i < 1; i++)
  46     {
  47       x[i].t = foo ();
  48       x[i].t = 0.f > x[i].t ? 0.f : x[i].t;
  49       bar (x[i].t);
  50     }
  51
  52   exit (0);
  53 }