dnl This file contains local autoconf functions.

dnl x87 floating point internal precision control checks
dnl See: http://wiki.php.net/rfc/rounding
AC_DEFUN([ZEND_CHECK_FLOAT_PRECISION],[
  AC_MSG_CHECKING([for usable _FPU_SETCW])
  AC_LINK_IFELSE([AC_LANG_PROGRAM([[
    #include <fpu_control.h>
  ]],[[
    fpu_control_t fpu_oldcw, fpu_cw;
    volatile double result;
    double a = 2877.0;
    volatile double b = 1000000.0;

    _FPU_GETCW(fpu_oldcw);
    fpu_cw = (fpu_oldcw & ~_FPU_EXTENDED & ~_FPU_SINGLE) | _FPU_DOUBLE;
    _FPU_SETCW(fpu_cw);
    result = a / b;
    _FPU_SETCW(fpu_oldcw);
  ]])],[ac_cfp_have__fpu_setcw=yes],[ac_cfp_have__fpu_setcw=no])
  if test "$ac_cfp_have__fpu_setcw" = "yes" ; then
    AC_DEFINE(HAVE__FPU_SETCW, 1, [whether _FPU_SETCW is present and usable])
    AC_MSG_RESULT(yes)
  else
    AC_MSG_RESULT(no)
  fi

  AC_MSG_CHECKING([for usable fpsetprec])
  AC_LINK_IFELSE([AC_LANG_PROGRAM([[
    #include <machine/ieeefp.h>
  ]],[[
    fp_prec_t fpu_oldprec;
    volatile double result;
    double a = 2877.0;
    volatile double b = 1000000.0;

    fpu_oldprec = fpgetprec();
    fpsetprec(FP_PD);
    result = a / b;
    fpsetprec(fpu_oldprec);
  ]])], [ac_cfp_have_fpsetprec=yes], [ac_cfp_have_fpsetprec=no])
  if test "$ac_cfp_have_fpsetprec" = "yes" ; then
    AC_DEFINE(HAVE_FPSETPREC, 1, [whether fpsetprec is present and usable])
    AC_MSG_RESULT(yes)
  else
    AC_MSG_RESULT(no)
  fi

  AC_MSG_CHECKING([for usable _controlfp])
  AC_LINK_IFELSE([AC_LANG_PROGRAM([[
    #include <float.h>
  ]],[[
    unsigned int fpu_oldcw;
    volatile double result;
    double a = 2877.0;
    volatile double b = 1000000.0;

    fpu_oldcw = _controlfp(0, 0);
    _controlfp(_PC_53, _MCW_PC);
    result = a / b;
    _controlfp(fpu_oldcw, _MCW_PC);
  ]])], [ac_cfp_have__controlfp=yes], [ac_cfp_have__controlfp=no])
  if test "$ac_cfp_have__controlfp" = "yes" ; then
    AC_DEFINE(HAVE__CONTROLFP, 1, [whether _controlfp is present usable])
    AC_MSG_RESULT(yes)
  else
    AC_MSG_RESULT(no)
  fi

  AC_MSG_CHECKING([for usable _controlfp_s])
  AC_LINK_IFELSE([AC_LANG_PROGRAM([[
   #include <float.h>
  ]],[[
    unsigned int fpu_oldcw, fpu_cw;
    volatile double result;
    double a = 2877.0;
    volatile double b = 1000000.0;

    _controlfp_s(&fpu_cw, 0, 0);
    fpu_oldcw = fpu_cw;
    _controlfp_s(&fpu_cw, _PC_53, _MCW_PC);
    result = a / b;
    _controlfp_s(&fpu_cw, fpu_oldcw, _MCW_PC);
  ]])], [ac_cfp_have__controlfp_s=yes], [ac_cfp_have__controlfp_s=no])
  if test "$ac_cfp_have__controlfp_s" = "yes" ; then
    AC_DEFINE(HAVE__CONTROLFP_S, 1, [whether _controlfp_s is present and usable])
    AC_MSG_RESULT(yes)
  else
    AC_MSG_RESULT(no)
  fi

  AC_MSG_CHECKING([whether FPU control word can be manipulated by inline assembler])
  AC_LINK_IFELSE([AC_LANG_PROGRAM([[
    /* nothing */
  ]],[[
    unsigned int oldcw, cw;
    volatile double result;
    double a = 2877.0;
    volatile double b = 1000000.0;

    __asm__ __volatile__ ("fnstcw %0" : "=m" (*&oldcw));
    cw = (oldcw & ~0x0 & ~0x300) | 0x200;
    __asm__ __volatile__ ("fldcw %0" : : "m" (*&cw));

    result = a / b;

    __asm__ __volatile__ ("fldcw %0" : : "m" (*&oldcw));
  ]])], [ac_cfp_have_fpu_inline_asm_x86=yes], [ac_cfp_have_fpu_inline_asm_x86=no])
  if test "$ac_cfp_have_fpu_inline_asm_x86" = "yes" ; then
    AC_DEFINE(HAVE_FPU_INLINE_ASM_X86, 1, [whether FPU control word can be manipulated by inline assembler])
    AC_MSG_RESULT(yes)
  else
    AC_MSG_RESULT(no)
  fi
])