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 #include "i386-cpuid.h"
   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   unsigned int edx;
  32   /* See if capabilities include SSE (25th bit; 26 for SSE2).  */
  33   edx = i386_cpuid();
  34   if (!(edx & bit_SSE))
  35     exit (0);
  36 }
  37
  38 int main (void)
  39 {
  40   int i;
  41   T x[1];
  42
  43   bail_if_no_sse ();
  44   for (i = 0; i < 1; i++)
  45     {
  46       x[i].t = foo ();
  47       x[i].t = 0.f > x[i].t ? 0.f : x[i].t;
  48       bar (x[i].t);
  49     }
  50
  51   exit (0);
  52 }