/* $OpenBSD: next_test.c,v 1.2 2021/12/13 18:04:28 deraadt Exp $ */ /*- * Copyright (c) 2005 David Schultz * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include "macros.h" /* * Test the correctness of nextafter{,f,l} and nexttoward{,f,l}. */ #include #include #include #include #include #ifdef __i386__ #include #endif #include "test-utils.h" #define test(exp, ans, ex) do { \ double __ans = (ans); \ feclearexcept(ALL_STD_EXCEPT); \ _testl(#exp, __LINE__, (exp), __ans, (ex)); \ } while (0) #define testf(exp, ans, ex) do { \ float __ans = (ans); \ feclearexcept(ALL_STD_EXCEPT); \ _testl(#exp, __LINE__, (exp), __ans, (ex)); \ } while (0) #define testl(exp, ans, ex) do { \ long double __ans = (ans); \ feclearexcept(ALL_STD_EXCEPT); \ _testl(#exp, __LINE__, (exp), __ans, (ex)); \ } while (0) #define testboth(arg1, arg2, ans, ex, prec) do { \ test##prec(nextafter##prec((arg1), (arg2)), (ans), (ex)); \ test##prec(nexttoward##prec((arg1), (arg2)), (ans), (ex)); \ } while (0) #define testall(arg1, arg2, ans, ex) do { \ testboth((arg1), (arg2), (ans), (ex), ); \ testboth((arg1), (arg2), (ans), (ex), f); \ testboth((arg1), (arg2), (ans), (ex), l); \ } while (0) static void _testl(const char *, int, long double, long double, int); static double idd(double); static float idf(float); static const int ex_under = FE_UNDERFLOW | FE_INEXACT; /* shorthand */ static const int ex_over = FE_OVERFLOW | FE_INEXACT; static const long double ldbl_eps = LDBL_EPSILON; ATF_TC_WITHOUT_HEAD(zeros); ATF_TC_BODY(zeros, tc) { long double ldbl_small; #ifndef __OpenBSD__ #ifdef __i386__ fpsetprec(FP_PE); #endif #endif /* * We can't use a compile-time constant here because gcc on * FreeBSD/i386 assumes long doubles are truncated to the * double format. */ ldbl_small = ldexpl(1.0, LDBL_MIN_EXP - LDBL_MANT_DIG); /* * Special cases involving zeroes. */ #define ztest(prec) \ test##prec(copysign##prec(1.0, nextafter##prec(0.0, -0.0)), -1.0, 0); \ test##prec(copysign##prec(1.0, nextafter##prec(-0.0, 0.0)), 1.0, 0); \ test##prec(copysign##prec(1.0, nexttoward##prec(0.0, -0.0)), -1.0, 0);\ test##prec(copysign##prec(1.0, nexttoward##prec(-0.0, 0.0)), 1.0, 0) ztest(); ztest(f); ztest(l); #undef ztest #define stest(next, eps, prec) \ test##prec(next(-0.0, 42.0), eps, ex_under); \ test##prec(next(0.0, -42.0), -eps, ex_under); \ test##prec(next(0.0, INFINITY), eps, ex_under); \ test##prec(next(-0.0, -INFINITY), -eps, ex_under) stest(nextafter, 0x1p-1074, ); stest(nextafterf, 0x1p-149f, f); stest(nextafterl, ldbl_small, l); stest(nexttoward, 0x1p-1074, ); stest(nexttowardf, 0x1p-149f, f); stest(nexttowardl, ldbl_small, l); #undef stest } ATF_TC_WITHOUT_HEAD(eq_and_nan); ATF_TC_BODY(eq_and_nan, tc) { /* * `x == y' and NaN tests */ testall(42.0, 42.0, 42.0, 0); testall(-42.0, -42.0, -42.0, 0); testall(INFINITY, INFINITY, INFINITY, 0); testall(-INFINITY, -INFINITY, -INFINITY, 0); testall(NAN, 42.0, NAN, 0); testall(42.0, NAN, NAN, 0); testall(NAN, NAN, NAN, 0); } ATF_TC_WITHOUT_HEAD(ordinary); ATF_TC_BODY(ordinary, tc) { /* * Tests where x is an ordinary normalized number */ testboth(1.0, 2.0, 1.0 + DBL_EPSILON, 0, ); testboth(1.0, -INFINITY, 1.0 - DBL_EPSILON / 2, 0, ); testboth(1.0, 2.0, 1.0 + FLT_EPSILON, 0, f); testboth(1.0, -INFINITY, 1.0 - FLT_EPSILON / 2, 0, f); testboth(1.0, 2.0, 1.0 + ldbl_eps, 0, l); testboth(1.0, -INFINITY, 1.0 - ldbl_eps / 2, 0, l); testboth(-1.0, 2.0, -1.0 + DBL_EPSILON / 2, 0, ); testboth(-1.0, -INFINITY, -1.0 - DBL_EPSILON, 0, ); testboth(-1.0, 2.0, -1.0 + FLT_EPSILON / 2, 0, f); testboth(-1.0, -INFINITY, -1.0 - FLT_EPSILON, 0, f); testboth(-1.0, 2.0, -1.0 + ldbl_eps / 2, 0, l); testboth(-1.0, -INFINITY, -1.0 - ldbl_eps, 0, l); /* Cases where nextafter(...) != nexttoward(...) */ test(nexttoward(1.0, 1.0 + ldbl_eps), 1.0 + DBL_EPSILON, 0); testf(nexttowardf(1.0, 1.0 + ldbl_eps), 1.0 + FLT_EPSILON, 0); testl(nexttowardl(1.0, 1.0 + ldbl_eps), 1.0 + ldbl_eps, 0); } ATF_TC_WITHOUT_HEAD(boundaries); ATF_TC_BODY(boundaries, tc) { /* * Tests at word boundaries, normalization boundaries, etc. */ testboth(0x1.87654ffffffffp+0, INFINITY, 0x1.87655p+0, 0, ); testboth(0x1.87655p+0, -INFINITY, 0x1.87654ffffffffp+0, 0, ); testboth(0x1.fffffffffffffp+0, INFINITY, 0x1p1, 0, ); testboth(0x1p1, -INFINITY, 0x1.fffffffffffffp+0, 0, ); testboth(0x0.fffffffffffffp-1022, INFINITY, 0x1p-1022, 0, ); testboth(0x1p-1022, -INFINITY, 0x0.fffffffffffffp-1022, ex_under, ); testboth(0x1.fffffep0f, INFINITY, 0x1p1, 0, f); testboth(0x1p1, -INFINITY, 0x1.fffffep0f, 0, f); testboth(0x0.fffffep-126f, INFINITY, 0x1p-126f, 0, f); testboth(0x1p-126f, -INFINITY, 0x0.fffffep-126f, ex_under, f); #if LDBL_MANT_DIG == 53 testboth(0x1.87654ffffffffp+0L, INFINITY, 0x1.87655p+0L, 0, l); testboth(0x1.87655p+0L, -INFINITY, 0x1.87654ffffffffp+0L, 0, l); testboth(0x1.fffffffffffffp+0L, INFINITY, 0x1p1L, 0, l); testboth(0x1p1L, -INFINITY, 0x1.fffffffffffffp+0L, 0, l); testboth(0x0.fffffffffffffp-1022L, INFINITY, 0x1p-1022L, 0, l); testboth(0x1p-1022L, -INFINITY, 0x0.fffffffffffffp-1022L, ex_under, l); #elif LDBL_MANT_DIG == 64 && !defined(__i386) testboth(0x1.87654321fffffffep+0L, INFINITY, 0x1.87654322p+0L, 0, l); testboth(0x1.87654322p+0L, -INFINITY, 0x1.87654321fffffffep+0L, 0, l); testboth(0x1.fffffffffffffffep0L, INFINITY, 0x1p1L, 0, l); testboth(0x1p1L, -INFINITY, 0x1.fffffffffffffffep0L, 0, l); testboth(0x0.fffffffffffffffep-16382L, INFINITY, 0x1p-16382L, 0, l); testboth(0x1p-16382L, -INFINITY, 0x0.fffffffffffffffep-16382L, ex_under, l); #elif LDBL_MANT_DIG == 113 testboth(0x1.876543210987ffffffffffffffffp+0L, INFINITY, 0x1.876543210988p+0, 0, l); testboth(0x1.876543210988p+0L, -INFINITY, 0x1.876543210987ffffffffffffffffp+0L, 0, l); testboth(0x1.ffffffffffffffffffffffffffffp0L, INFINITY, 0x1p1L, 0, l); testboth(0x1p1L, -INFINITY, 0x1.ffffffffffffffffffffffffffffp0L, 0, l); testboth(0x0.ffffffffffffffffffffffffffffp-16382L, INFINITY, 0x1p-16382L, 0, l); testboth(0x1p-16382L, -INFINITY, 0x0.ffffffffffffffffffffffffffffp-16382L, ex_under, l); #endif } ATF_TC_WITHOUT_HEAD(overflow); ATF_TC_BODY(overflow, tc) { long double ldbl_max; /* * We can't use a compile-time constant here because gcc on * FreeBSD/i386 assumes long doubles are truncated to the * double format. */ ldbl_max = ldexpl(1.0 - ldbl_eps / 2, LDBL_MAX_EXP); /* * Overflow tests */ test(idd(nextafter(DBL_MAX, INFINITY)), INFINITY, ex_over); test(idd(nextafter(INFINITY, 0.0)), DBL_MAX, 0); test(idd(nexttoward(DBL_MAX, DBL_MAX * 2.0L)), INFINITY, ex_over); #if LDBL_MANT_DIG > 53 test(idd(nexttoward(INFINITY, DBL_MAX * 2.0L)), DBL_MAX, 0); #endif testf(idf(nextafterf(FLT_MAX, INFINITY)), INFINITY, ex_over); testf(idf(nextafterf(INFINITY, 0.0)), FLT_MAX, 0); testf(idf(nexttowardf(FLT_MAX, FLT_MAX * 2.0)), INFINITY, ex_over); testf(idf(nexttowardf(INFINITY, FLT_MAX * 2.0)), FLT_MAX, 0); testboth(ldbl_max, INFINITY, INFINITY, ex_over, l); testboth(INFINITY, 0.0, ldbl_max, 0, l); } static void _testl(const char *exp, int line, long double actual, long double expected, int except) { int actual_except; actual_except = fetestexcept(ALL_STD_EXCEPT); if (!fpequal_cs(actual, expected, true)) { atf_tc_fail_check(__FILE__, line, "%s returned %La, expecting %La\n", exp, actual, expected); } if (actual_except != except) { atf_tc_fail_check(__FILE__, line, "%s raised 0x%x, expecting 0x%x\n", exp, actual_except, except); } } /* * The idd() and idf() routines ensure that doubles and floats are * converted to their respective types instead of stored in the FPU * with extra precision. */ static double idd(double x) { return (x); } static float idf(float x) { return (x); } ATF_TP_ADD_TCS(tp) { ATF_TP_ADD_TC(tp, zeros); ATF_TP_ADD_TC(tp, ordinary); ATF_TP_ADD_TC(tp, eq_and_nan); ATF_TP_ADD_TC(tp, boundaries); ATF_TP_ADD_TC(tp, overflow); return (atf_no_error()); }