[Bug c/33220] New: impossible constraint in ‘asm’

[yakov at emc dot com]

cc -O2 -dr -msoft-float -c f_powf.c
f_powf.c: In function ‘_f_powf’:
f_powf.c:49: error: impossible constraint in ‘asm’

typedef unsigned int __uint32_t;
typedef signed int __int32_t;
typedef union
{
  double value;
  struct
  {
    __uint32_t lsw;
    __uint32_t msw;
  } parts;
} ieee_double_shape_type;
typedef union
{
  float value;
  __uint32_t word;
} ieee_float_shape_type;

extern float powf (float, float);

__inline__ static int
check_finite(double x)

{
  __int32_t hx;
  do { ieee_double_shape_type gh_u; gh_u.value = (x); (hx) = gh_u.parts.msw; }
while (0);
  return (int)((__uint32_t)((hx&0x7fffffff)-0x7ff00000)>>31);
}

__inline__
static
int
check_finitef(float x)

{
  __int32_t ix;
  do { ieee_float_shape_type gf_u; gf_u.value = (x); (ix) = gf_u.word; } while
(0);
  return (int)((__uint32_t)((ix&0x7fffffff)-0x7f800000)>>31);
}

float _f_powf (float x, float y)
{

  if (x > 0.0 && check_finitef(y))
    {
      float result;

      asm ("flds 8(%%ebp); fyl2x; fld %%st; frndint; fsub %%st,%%st(1);" "fxch;
fchs; f2xm1; fld1; faddp; fxch; fld1; fscale; fstp %%st(1);" "fmulp" : "=t"
(result) : "0" (y));

      return result;
    }
  else
    return powf (x,y);
}


-- 
           Summary: impossible constraint in ‘asm’
           Product: gcc
           Version: 4.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: yakov at emc dot com
 GCC build triplet: gcc (GCC) 4.1.2 20061115 (prerelease) (SUSE Linux)
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: x86


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33220