glibc/stdlib/tst-strtod-round-skeleton.c

/* Test for correct rounding of results of strtod and related
   functions.
   Copyright (C) 2012-2016 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

/* Defining _LIBC_TEST ensures long double math functions are
   declared in the headers.  */
#define _LIBC_TEST 1
#include <fenv.h>
#include <float.h>
#include <math.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math-tests.h>

#include "tst-strtod.h"

/* Non-standard macros expected to be externally defined:

   L_(str): Pastes the appropriate modifier to a string literal str.

   FNPFX: Expands to the correct prefix for the strtod equivalent
          of type CHAR. (e.g str or wcs).

   CHAR: Expands to the string type being tested (e.g wchar_t or char).

   STRM: Expands to a string literal suitable for printing CHAR* via
         printf (e.g "%s" or "%ls"). */

#define _CONCAT(a, b) a ## b
#define CONCAT(a, b) _CONCAT (a, b)

#define STRTO(x) CONCAT (CONCAT (FNPFX, to), x)

#if LDBL_MANT_DIG == 106 && LDBL_MAX_EXP == 1024
/* This is a stupid hack for IBM long double.  This test ignores
   inexact values for long double due to the limitations of the
   format.  This ensures rounding tests are ignored.  */
# undef ROUNDING_TESTS_long_double
# define ROUNDING_TESTS_long_double(x) 0
#endif

/* Generator to create an FTYPE member variabled named FSUF
   used to populate struct member variables.  */
#define FTYPE_MEMBER(FSUF, FTYPE, FTOSTR, FTOSTRM, LSUF, CSUF)  \
       FTYPE FSUF;

/* Likewise, but each member is of type bool.  */
#define BOOL_MEMBER(FSUF, FTYPE, FTOSTR, FTOSTRM, LSUF, CSUF)  \
       bool FSUF;

#define STRUCT_FOREACH_FLOAT_FTYPE GEN_TEST_STRTOD_FOREACH (FTYPE_MEMBER)
#define STRUCT_FOREACH_FLOAT_BOOL GEN_TEST_STRTOD_FOREACH (BOOL_MEMBER)

/* Define the long double choose (CHOOSE_ld) macro
   to select the appropriate generated long double
   value from the generated test data.  */
#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
/* This is for the long double == double format.  */
# define CHOOSE_ld(f,d,...) d
#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384 && LDBL_MIN_EXP == -16381
/* This is for the Intel extended float format.  */
# define CHOOSE_ld(f,d,ld64i,...) ld64i
#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384 && LDBL_MIN_EXP == -16382
/* This is for the Motorola extended float format.  */
# define CHOOSE_ld(f,d,ld64i,ld64m,...) ld64m
#elif LDBL_MANT_DIG == 106 && LDBL_MAX_EXP == 1024
/* This is for the IBM extended double format.  */
# define CHOOSE_ld(f,d,ld64i,ld64m,ld106,...) ld106
#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
/* This is for the IEEE binary128 format.  */
# define CHOOSE_ld(f,d,ld64i,ld64m,ld106,ld113,...) ld113
#else
# error "unknown long double format"
#endif

/* Add type specific choosing macros below.  */
#define CHOOSE_f(f,...) f
#define CHOOSE_d(f,d,...) d
/* long double is special, and handled above.  */

/* Selector for expected result field of a given type.  */
#define _ENTRY(FSUF, FTYPE, FTOSTR, FTOSTRM, LSUF, CSUF, ...)  \
  CONCAT (CHOOSE_ ## FSUF (__VA_ARGS__), LSUF),
#define ENTRY(...) \
  GEN_TEST_STRTOD_FOREACH (_ENTRY, __VA_ARGS__)

/* Selector for boolean exact tag of expected results.  */
#define _XNTRY(FSUF, FTYPE, FTOSTR, FTOSTRM, LSUF, CSUF, ...)  \
  CHOOSE_ ## FSUF (__VA_ARGS__),
#define XNTRY(...) \
  GEN_TEST_STRTOD_FOREACH (_XNTRY, __VA_ARGS__)

/* This is hacky way around the seemingly unavoidable macro
   expansion of the INFINITY or HUGE_VAL like macros in the
   above.  It is assumed the compiler will implicitly convert
   the infinity correctly.  */
#define INF INFINITY + 0.0

/* This macro is used in conjunction with the output from the
   gen-tst-strtod-round utility to select the appropriately
   rounded long double value for a given format.  */
#define TEST(s,						\
	     fx, fd, fn, fz, fu,			\
	     dx, dd, dn, dz, du,			\
	     ld64ix, ld64id, ld64in, ld64iz, ld64iu,	\
	     ld64mx, ld64md, ld64mn, ld64mz, ld64mu,	\
	     ld106x, ld106d, ld106n, ld106z, ld106u,	\
	     ld113x, ld113d, ld113n, ld113z, ld113u)	\
  {							\
    L_ (s),						\
    { XNTRY (fx, dx, ld64ix, ld64mx, ld106x, ld113x) },	\
    {							\
    { ENTRY (fn, dn, ld64in, ld64mn, ld106n, ld113n) },	\
    { ENTRY (fd, dd, ld64id, ld64md, ld106d, ld113d) },	\
    { ENTRY (fz, dz, ld64iz, ld64mz, ld106z, ld113z) },	\
    { ENTRY (fu, du, ld64iu, ld64mu, ld106u, ld113u) }	\
    }							\
  }

struct test_exactness
  {
  STRUCT_FOREACH_FLOAT_BOOL
  };

struct test_results
  {
  STRUCT_FOREACH_FLOAT_FTYPE
  };

struct test {
  const CHAR *s;
  struct test_exactness exact;
  struct test_results r[4];
};

/* Include the generated test data.  */
#include "tst-strtod-round-data.h"

#define STRX(x) #x
#define STR(x) STRX (x)
#define FNPFXS STR (FNPFX)

#define GEN_ONE_TEST(FSUF, FTYPE, FTOSTR, FTOSTRM, LSUF, CSUF)	\
{								\
  FTYPE f = STRTO (FSUF) (s, NULL);				\
  if (f != expected->FSUF					\
      || (copysign ## CSUF) (1.0 ## LSUF, f)			\
	 != (copysign ## CSUF) (1.0 ## LSUF, expected->FSUF))	\
    {								\
      CHAR efstr[FSTRLENMAX];					\
      CHAR fstr[FSTRLENMAX];					\
      FTOSTR (efstr, FSTRLENMAX, L_("%") L_(FTOSTRM) L_("a"),   \
	      expected->FSUF);    				\
      FTOSTR (fstr, FSTRLENMAX, L_("%") L_(FTOSTRM) L_("a"), f);\
      printf (FNPFXS "to" #FSUF  " (" STRM ") returned " STRM   \
	      " not " STRM " (%s)\n",				\
	      s, fstr, efstr, mode_name);			\
      if (ROUNDING_TESTS (FTYPE, rnd_mode) || exact->FSUF)	\
	result = 1;						\
      else							\
	printf ("ignoring this inexact result\n");		\
    }								\
}

static int
test_in_one_mode (const CHAR *s, const struct test_results *expected,
		  const struct test_exactness *exact, const char *mode_name,
		  int rnd_mode)
{
  int result = 0;
  GEN_TEST_STRTOD_FOREACH (GEN_ONE_TEST)
  return result;
}

static const struct fetestmodes
  {
  const char *mode_name;
  int rnd_mode;
  int rnd_i; /* Corresponding index into r array of struct test.  */
  } modes[] = {
    { "default rounding mode", FE_TONEAREST, 0 },
#ifdef FE_DOWNWARD
    { "FE_DOWNWARD", FE_DOWNWARD, 1 },
#endif
#ifdef FE_TOWARDZERO
    { "FE_TOWARDZERO", FE_TOWARDZERO, 2 },
#endif
#ifdef FE_UPWARD
    { "FE_UPWARD", FE_UPWARD, 3 },
#endif
    {}
};

static int
do_test (void)
{
  int save_round_mode __attribute__ ((unused)) = fegetround ();
  int result = 0;
  for (size_t i = 0; i < sizeof (tests) / sizeof (tests[0]); i++)
    {
      result |= test_in_one_mode (tests[i].s, &tests[i].r[modes[0].rnd_i],
				  &tests[i].exact, modes[0].mode_name,
				  modes[0].rnd_mode);
      for (const struct fetestmodes *m = &modes[1]; m->mode_name != NULL; m++)
	{
	  if (!fesetround (m->rnd_mode))
	    {
	      result |= test_in_one_mode (tests[i].s, &tests[i].r[m->rnd_i],
					  &tests[i].exact, m->mode_name,
					  m->rnd_mode);
	      fesetround (save_round_mode);
	    }
	}
    }
  return result;
}

#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"