317 lines
9.9 KiB
C
317 lines
9.9 KiB
C
/* Test for correct rounding of results of strtod and related
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functions.
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Copyright (C) 2012-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* Defining _LIBC_TEST ensures long double math functions are
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declared in the headers. */
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#define _LIBC_TEST 1
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#define __STDC_WANT_IEC_60559_TYPES_EXT__
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#include <fenv.h>
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#include <float.h>
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#include <math.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math-tests.h>
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#include "tst-strtod.h"
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/* Non-standard macros expected to be externally defined:
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L_(str): Pastes the appropriate modifier to a string literal str.
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FNPFX: Expands to the correct prefix for the strtod equivalent
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of type CHAR. (e.g str or wcs).
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CHAR: Expands to the string type being tested (e.g wchar_t or char).
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STRM: Expands to a string literal suitable for printing CHAR* via
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printf (e.g "%s" or "%ls"). */
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#define _CONCAT(a, b) a ## b
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#define CONCAT(a, b) _CONCAT (a, b)
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#define STRTO(x) CONCAT (CONCAT (FNPFX, to), x)
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#if LDBL_MANT_DIG == 106 && LDBL_MAX_EXP == 1024
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/* This is a stupid hack for IBM long double. This test ignores
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inexact values for long double due to the limitations of the
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format. This ensures rounding tests are ignored. */
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# undef ROUNDING_TESTS_long_double
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# define ROUNDING_TESTS_long_double(x) 0
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#endif
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/* Generator to create an FTYPE member variabled named FSUF
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used to populate struct member variables. */
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#define FTYPE_MEMBER(FSUF, FTYPE, FTOSTR, LSUF, CSUF) \
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FTYPE FSUF;
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/* Likewise, but each member is of type bool. */
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#define BOOL_MEMBER(FSUF, FTYPE, FTOSTR, LSUF, CSUF) \
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bool FSUF;
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#define STRUCT_FOREACH_FLOAT_FTYPE GEN_TEST_STRTOD_FOREACH (FTYPE_MEMBER)
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#define STRUCT_FOREACH_FLOAT_BOOL GEN_TEST_STRTOD_FOREACH (BOOL_MEMBER)
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/* Define the long double choose (CHOOSE_ld) macro
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to select the appropriate generated long double
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value from the generated test data. */
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#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
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/* This is for the long double == double format. */
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# define CHOOSE_ld(f,d,...) d
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#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384 && LDBL_MIN_EXP == -16381
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/* This is for the Intel extended float format. */
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# define CHOOSE_ld(f,d,ld64i,...) ld64i
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#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384 && LDBL_MIN_EXP == -16382
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/* This is for the Motorola extended float format. */
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# define CHOOSE_ld(f,d,ld64i,ld64m,...) ld64m
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#elif LDBL_MANT_DIG == 106 && LDBL_MAX_EXP == 1024
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/* This is for the IBM extended double format. */
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# define CHOOSE_ld(f,d,ld64i,ld64m,ld106,...) ld106
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#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
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/* This is for the IEEE binary128 format. */
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# define CHOOSE_ld(f,d,ld64i,ld64m,ld106,ld113,...) ld113
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#else
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# error "unknown long double format"
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#endif
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/* Add type specific choosing macros below. */
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#define CHOOSE_f(f,...) f
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#define CHOOSE_f32(f,...) f
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#define CHOOSE_d(f,d,...) d
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#define CHOOSE_f64(f,d,...) d
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#define CHOOSE_f32x(f,d,...) d
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#define CHOOSE_f128(f,d,ld64i,ld64m,ld106,ld113,...) ld113
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/* long double is special, and handled above. _Float16 would require
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updates to the generator to generate appropriate expectations, and
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updates to the test inputs to cover difficult rounding cases for
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_Float16. */
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#if __HAVE_FLOAT64X
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# if FLT64X_MANT_DIG == 113 && FLT64X_MAX_EXP == 16384
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# define CHOOSE_f64x(f,d,ld64i,ld64m,ld106,ld113,...) ld113
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# elif (FLT64X_MANT_DIG == 64 \
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&& FLT64X_MAX_EXP == 16384 \
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&& FLT64X_MIN_EXP == -16381)
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# define CHOOSE_f64x(f,d,ld64i,...) ld64i
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# else
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# error "unknown _Float64x format"
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# endif
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#endif
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/* Selector for expected result field of a given type. */
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#define _ENTRY(FSUF, FTYPE, FTOSTR, LSUF, CSUF, ...) \
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CONCAT (CHOOSE_ ## FSUF (__VA_ARGS__), LSUF),
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#define ENTRY(...) \
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GEN_TEST_STRTOD_FOREACH (_ENTRY, __VA_ARGS__)
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/* Selector for boolean exact tag of expected results and that for
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overflow. */
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#define _XNTRY(FSUF, FTYPE, FTOSTR, LSUF, CSUF, ...) \
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CHOOSE_ ## FSUF (__VA_ARGS__),
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#define XNTRY(...) \
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GEN_TEST_STRTOD_FOREACH (_XNTRY, __VA_ARGS__)
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/* This is hacky way around the seemingly unavoidable macro
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expansion of the INFINITY or HUGE_VAL like macros in the
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above. It is assumed the compiler will implicitly convert
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the infinity correctly. */
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#define INF INFINITY + 0.0
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/* This macro is used in conjunction with the output from the
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gen-tst-strtod-round utility to select the appropriately
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rounded long double value for a given format. */
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#define TEST(s, \
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fx, fd, fdo, fn, fno, fz, fzo, fu, fuo, \
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dx, dd, ddo, dn, dno, dz, dzo, du, duo, \
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ld64ix, ld64id, ld64ido, ld64in, ld64ino, \
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ld64iz, ld64izo, ld64iu, ld64iuo, \
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ld64mx, ld64md, ld64mdo, ld64mn, ld64mno, \
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ld64mz, ld64mzo, ld64mu, ld64muo, \
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ld106x, ld106d, ld106do, ld106n, ld106no, \
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ld106z, ld106zo, ld106u, ld106uo, \
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ld113x, ld113d, ld113do, ld113n, ld113no, \
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ld113z, ld113zo, ld113u, ld113uo) \
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{ \
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L_ (s), \
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{ XNTRY (fx, dx, ld64ix, ld64mx, ld106x, ld113x) }, \
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{ \
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{ ENTRY (fn, dn, ld64in, ld64mn, ld106n, ld113n) }, \
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{ ENTRY (fd, dd, ld64id, ld64md, ld106d, ld113d) }, \
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{ ENTRY (fz, dz, ld64iz, ld64mz, ld106z, ld113z) }, \
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{ ENTRY (fu, du, ld64iu, ld64mu, ld106u, ld113u) } \
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}, \
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{ \
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{ XNTRY (fno, dno, ld64ino, ld64mno, ld106no, ld113no) }, \
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{ XNTRY (fdo, ddo, ld64ido, ld64mdo, ld106do, ld113do) }, \
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{ XNTRY (fzo, dzo, ld64izo, ld64mzo, ld106zo, ld113zo) }, \
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{ XNTRY (fuo, duo, ld64iuo, ld64muo, ld106uo, ld113uo) } \
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} \
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}
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struct test_exactness
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{
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STRUCT_FOREACH_FLOAT_BOOL
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};
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struct test_results
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{
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STRUCT_FOREACH_FLOAT_FTYPE
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};
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struct test_overflow
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{
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STRUCT_FOREACH_FLOAT_BOOL
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};
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struct test {
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const CHAR *s;
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struct test_exactness exact;
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struct test_results r[4];
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struct test_overflow o[4];
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};
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/* Include the generated test data. */
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#include "tst-strtod-round-data.h"
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#define STRX(x) #x
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#define STR(x) STRX (x)
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#define FNPFXS STR (FNPFX)
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#ifndef FE_INEXACT
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# define FE_INEXACT 0
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#endif
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#ifndef FE_OVERFLOW
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# define FE_OVERFLOW 0
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#endif
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#define GEN_ONE_TEST(FSUF, FTYPE, FTOSTR, LSUF, CSUF) \
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{ \
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feclearexcept (FE_ALL_EXCEPT); \
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FTYPE f = STRTO (FSUF) (s, NULL); \
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if (f != expected->FSUF \
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|| (copysign ## CSUF) (1.0 ## LSUF, f) \
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!= (copysign ## CSUF) (1.0 ## LSUF, expected->FSUF)) \
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{ \
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char efstr[FSTRLENMAX]; \
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char fstr[FSTRLENMAX]; \
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FTOSTR (efstr, FSTRLENMAX, "%a", expected->FSUF); \
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FTOSTR (fstr, FSTRLENMAX, "%a", f); \
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printf (FNPFXS "to" #FSUF " (" STRM ") returned %s not " \
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"%s (%s)\n", s, fstr, efstr, mode_name); \
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if (ROUNDING_TESTS (FTYPE, rnd_mode) || exact->FSUF) \
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result = 1; \
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else \
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printf ("ignoring this inexact result\n"); \
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} \
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else \
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{ \
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if (FE_INEXACT != 0) \
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{ \
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bool inexact_raised = fetestexcept (FE_INEXACT) != 0; \
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if (inexact_raised != !exact->FSUF) \
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{ \
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printf (FNPFXS "to" #FSUF \
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" (" STRM ") inexact %d " \
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"not %d\n", s, inexact_raised, \
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!exact->FSUF); \
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if (EXCEPTION_TESTS (FTYPE)) \
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result = 1; \
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else \
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printf ("ignoring this exception error\n"); \
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} \
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} \
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if (FE_OVERFLOW != 0) \
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{ \
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bool overflow_raised \
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= fetestexcept (FE_OVERFLOW) != 0; \
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if (overflow_raised != overflow->FSUF) \
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{ \
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printf (FNPFXS "to" #FSUF \
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" (" STRM ") overflow %d " \
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"not %d\n", s, overflow_raised, \
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overflow->FSUF); \
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if (EXCEPTION_TESTS (FTYPE)) \
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result = 1; \
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else \
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printf ("ignoring this exception error\n"); \
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} \
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} \
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} \
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}
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static int
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test_in_one_mode (const CHAR *s, const struct test_results *expected,
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const struct test_exactness *exact,
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const struct test_overflow *overflow,
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const char *mode_name, int rnd_mode)
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{
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int result = 0;
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GEN_TEST_STRTOD_FOREACH (GEN_ONE_TEST)
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return result;
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}
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static const struct fetestmodes
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{
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const char *mode_name;
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int rnd_mode;
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int rnd_i; /* Corresponding index into r array of struct test. */
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} modes[] = {
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{ "default rounding mode", FE_TONEAREST, 0 },
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#ifdef FE_DOWNWARD
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{ "FE_DOWNWARD", FE_DOWNWARD, 1 },
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#endif
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#ifdef FE_TOWARDZERO
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{ "FE_TOWARDZERO", FE_TOWARDZERO, 2 },
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#endif
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#ifdef FE_UPWARD
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{ "FE_UPWARD", FE_UPWARD, 3 },
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#endif
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{}
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};
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static int
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do_test (void)
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{
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int save_round_mode __attribute__ ((unused)) = fegetround ();
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int result = 0;
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for (size_t i = 0; i < sizeof (tests) / sizeof (tests[0]); i++)
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{
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result |= test_in_one_mode (tests[i].s, &tests[i].r[modes[0].rnd_i],
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&tests[i].exact, &tests[i].o[modes[0].rnd_i],
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modes[0].mode_name, modes[0].rnd_mode);
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for (const struct fetestmodes *m = &modes[1]; m->mode_name != NULL; m++)
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{
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if (!fesetround (m->rnd_mode))
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{
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result |= test_in_one_mode (tests[i].s, &tests[i].r[m->rnd_i],
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&tests[i].exact,
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&tests[i].o[m->rnd_i], m->mode_name,
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m->rnd_mode);
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fesetround (save_round_mode);
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}
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}
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}
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return result;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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