gnu/dist/gcc4/gcc/testsuite/gcc.target/i386/builtin-apply-mmx.c

   1 /* __builtin_apply_args () and __builtin_return () built-in functions does
   2    not function properly when -mmmx is used in compile flags.
   3    __builtin_apply_args () saves all registers that pass arguments to a
   4    function, including %mm0-%mm3, to a memory block, and __builtin_return ()
   5    restores %mm0, from a return memory block, as it can be used as a
   6    function return register.  Unfortunatelly, when MMX registers are touched,
   7    i387 FPU switches to MMX mode, and no FP operation is possible until emms
   8    instruction is issued.  */
   9
  10 /* This test case is adapted from gcc.dg/builtin-apply4.c.  */
  11
  12 /* { dg-do run { xfail "*-*-*" } } */
  13 /* { dg-options "-O2 -mmmx" } */
  14 /* { dg-require-effective-target ilp32 } */
  15
  16 #include "../../gcc.dg/i386-cpuid.h"
  17
  18 extern void abort (void);
  19
  20 double
  21 foo (double arg)
  22 {
  23   if (arg != 116.0)
  24     abort ();
  25
  26   return arg + 1.0;
  27 }
  28
  29 inline double
  30 bar (double arg)
  31 {
  32   foo (arg);
  33   __builtin_return (__builtin_apply ((void (*)()) foo,
  34                                      __builtin_apply_args (), 16));
  35 }
  36
  37 int
  38 main (int argc, char **argv)
  39 {
  40   unsigned long cpu_facilities;
  41
  42   cpu_facilities = i386_cpuid ();
  43
  44   if (!(cpu_facilities & bit_MMX))
  45     /* If host has no MMX support, pass.  */
  46     return 0;
  47
  48   if (bar (116.0) != 117.0)
  49     abort ();
  50
  51   return 0;
  52 }