diff options
Diffstat (limited to 'tests/test-frexpl.c')
| -rw-r--r-- | tests/test-frexpl.c | 183 |
1 files changed, 164 insertions, 19 deletions
diff --git a/tests/test-frexpl.c b/tests/test-frexpl.c index fc2a4de..8d9d41d 100644 --- a/tests/test-frexpl.c +++ b/tests/test-frexpl.c @@ -1,5 +1,5 @@ /* Test of splitting a 'long double' into fraction and mantissa. - Copyright (C) 2007-2015 Free Software Foundation, Inc. + Copyright (C) 2007-2010 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -27,8 +27,6 @@ SIGNATURE_CHECK (frexpl, long double, (long double, int *)); #include "fpucw.h" #include "isnanl-nolibm.h" -#include "minus-zero.h" -#include "infinity.h" #include "nan.h" #include "macros.h" @@ -37,18 +35,6 @@ SIGNATURE_CHECK (frexpl, long double, (long double, int *)); #undef exp #define exp exponent -#undef INFINITY -#undef NAN - -#define DOUBLE long double -#define VOLATILE -#define ISNAN isnanl -#define INFINITY Infinityl () -#define NAN NaNl () -#define L_(literal) literal##L -#define MINUS_ZERO minus_zerol -#define MAX_EXP LDBL_MAX_EXP -#define MIN_EXP LDBL_MIN_EXP /* On MIPS IRIX machines, LDBL_MIN_EXP is -1021, but the smallest reliable exponent for 'long double' is -964. Similarly, on PowerPC machines, LDBL_MIN_EXP is -1021, but the smallest reliable exponent for 'long double' @@ -61,18 +47,177 @@ SIGNATURE_CHECK (frexpl, long double, (long double, int *)); #else # define MIN_NORMAL_EXP LDBL_MIN_EXP #endif -#define FREXP frexpl -#define RANDOM randoml -#include "test-frexp.h" + +/* On HP-UX 10.20, negating 0.0L does not yield -0.0L. + So we use minus_zero instead. + IRIX cc can't put -0.0L into .data, but can compute at runtime. + Note that the expression -LDBL_MIN * LDBL_MIN does not work on other + platforms, such as when cross-compiling to PowerPC on MacOS X 10.5. */ +#if defined __hpux || defined __sgi +static long double +compute_minus_zero (void) +{ + return -LDBL_MIN * LDBL_MIN; +} +# define minus_zero compute_minus_zero () +#else +long double minus_zero = -0.0L; +#endif + +static long double +my_ldexp (long double x, int d) +{ + for (; d > 0; d--) + x *= 2.0L; + for (; d < 0; d++) + x *= 0.5L; + return x; +} int main () { + int i; + long double x; DECL_LONG_DOUBLE_ROUNDING BEGIN_LONG_DOUBLE_ROUNDING (); - test_function (); + { /* NaN. */ + int exp = -9999; + long double mantissa; + x = NaNl (); + mantissa = frexpl (x, &exp); + ASSERT (isnanl (mantissa)); + } + + { /* Positive infinity. */ + int exp = -9999; + long double mantissa; + x = 1.0L / 0.0L; + mantissa = frexpl (x, &exp); + ASSERT (mantissa == x); + } + + { /* Negative infinity. */ + int exp = -9999; + long double mantissa; + x = -1.0L / 0.0L; + mantissa = frexpl (x, &exp); + ASSERT (mantissa == x); + } + + { /* Positive zero. */ + int exp = -9999; + long double mantissa; + x = 0.0L; + mantissa = frexpl (x, &exp); + ASSERT (exp == 0); + ASSERT (mantissa == x); + ASSERT (!signbit (mantissa)); + } + + { /* Negative zero. */ + int exp = -9999; + long double mantissa; + x = minus_zero; + mantissa = frexpl (x, &exp); + ASSERT (exp == 0); + ASSERT (mantissa == x); + ASSERT (signbit (mantissa)); + } + + for (i = 1, x = 1.0L; i <= LDBL_MAX_EXP; i++, x *= 2.0L) + { + int exp = -9999; + long double mantissa = frexpl (x, &exp); + ASSERT (exp == i); + ASSERT (mantissa == 0.5L); + } + for (i = 1, x = 1.0L; i >= MIN_NORMAL_EXP; i--, x *= 0.5L) + { + int exp = -9999; + long double mantissa = frexpl (x, &exp); + ASSERT (exp == i); + ASSERT (mantissa == 0.5L); + } + for (; i >= LDBL_MIN_EXP - 100 && x > 0.0L; i--, x *= 0.5L) + { + int exp = -9999; + long double mantissa = frexpl (x, &exp); + ASSERT (exp == i); + ASSERT (mantissa == 0.5L); + } + + for (i = 1, x = -1.0L; i <= LDBL_MAX_EXP; i++, x *= 2.0L) + { + int exp = -9999; + long double mantissa = frexpl (x, &exp); + ASSERT (exp == i); + ASSERT (mantissa == -0.5L); + } + for (i = 1, x = -1.0L; i >= MIN_NORMAL_EXP; i--, x *= 0.5L) + { + int exp = -9999; + long double mantissa = frexpl (x, &exp); + ASSERT (exp == i); + ASSERT (mantissa == -0.5L); + } + for (; i >= LDBL_MIN_EXP - 100 && x < 0.0L; i--, x *= 0.5L) + { + int exp = -9999; + long double mantissa = frexpl (x, &exp); + ASSERT (exp == i); + ASSERT (mantissa == -0.5L); + } + + for (i = 1, x = 1.01L; i <= LDBL_MAX_EXP; i++, x *= 2.0L) + { + int exp = -9999; + long double mantissa = frexpl (x, &exp); + ASSERT (exp == i); + ASSERT (mantissa == 0.505L); + } + for (i = 1, x = 1.01L; i >= MIN_NORMAL_EXP; i--, x *= 0.5L) + { + int exp = -9999; + long double mantissa = frexpl (x, &exp); + ASSERT (exp == i); + ASSERT (mantissa == 0.505L); + } + for (; i >= LDBL_MIN_EXP - 100 && x > 0.0L; i--, x *= 0.5L) + { + int exp = -9999; + long double mantissa = frexpl (x, &exp); + ASSERT (exp == i); + ASSERT (mantissa >= 0.5L); + ASSERT (mantissa < 1.0L); + ASSERT (mantissa == my_ldexp (x, - exp)); + } + + for (i = 1, x = 1.73205L; i <= LDBL_MAX_EXP; i++, x *= 2.0L) + { + int exp = -9999; + long double mantissa = frexpl (x, &exp); + ASSERT (exp == i); + ASSERT (mantissa == 0.866025L); + } + for (i = 1, x = 1.73205L; i >= MIN_NORMAL_EXP; i--, x *= 0.5L) + { + int exp = -9999; + long double mantissa = frexpl (x, &exp); + ASSERT (exp == i); + ASSERT (mantissa == 0.866025L); + } + for (; i >= LDBL_MIN_EXP - 100 && x > 0.0L; i--, x *= 0.5L) + { + int exp = -9999; + long double mantissa = frexpl (x, &exp); + ASSERT (exp == i || exp == i + 1); + ASSERT (mantissa >= 0.5L); + ASSERT (mantissa < 1.0L); + ASSERT (mantissa == my_ldexp (x, - exp)); + } return 0; } |