diff options
| -rw-r--r-- | ChangeLog | 11 | ||||
| -rw-r--r-- | NEWS | 2 | ||||
| -rw-r--r-- | manual/arith.texi | 8 | ||||
| -rwxr-xr-x | manual/libm-err-tab.pl | 2 | ||||
| -rw-r--r-- | math/libm-test.inc | 28 | ||||
| -rw-r--r-- | math/math.h | 7 |
6 files changed, 55 insertions, 3 deletions
@@ -1,3 +1,14 @@ +2016-09-23 Joseph Myers <joseph@codesourcery.com> + + * math/math.h [__GLIBC_USE (IEC_60559_BFP_EXT)] (iszero): New + macro. + * math/libm-test.inc (iszero_test_data): New array. + (iszero_test): New function. + (main): Call iszero_test. + * manual/arith.texi (Floating Point Classes): Document iszero. + * manual/libm-err-tab.pl: Update comment on interfaces without + ulps tabulated. + 2016-09-23 Zack Weinberg <zackw@panix.com> * scripts/check-installed-headers.sh: New script. @@ -51,7 +51,7 @@ Version 2.25 * New <math.h> features are added from TS 18661-1:2014: - - Classification macros: issubnormal. + - Classification macros: issubnormal, iszero. * The <sys/quota.h> header now includes the <linux/quota.h> header. Support for the Linux quota interface which predates kernel version 2.4.22 has diff --git a/manual/arith.texi b/manual/arith.texi index bfa236a..58f3578 100644 --- a/manual/arith.texi +++ b/manual/arith.texi @@ -414,6 +414,14 @@ This macro returns a nonzero value if @var{x} is subnormal. It is from TS 18661-1:2014. @end deftypefn +@comment math.h +@comment ISO +@deftypefn {Macro} int iszero (@emph{float-type} @var{x}) +@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}} +This macro returns a nonzero value if @var{x} is zero. It is from TS +18661-1:2014. +@end deftypefn + Another set of floating-point classification functions was provided by BSD. @Theglibc{} also supports these functions; however, we recommend that you use the ISO C99 macros in new code. Those are standard diff --git a/manual/libm-err-tab.pl b/manual/libm-err-tab.pl index adeadb8..2386772 100755 --- a/manual/libm-err-tab.pl +++ b/manual/libm-err-tab.pl @@ -78,7 +78,7 @@ use vars qw (%results @all_floats %suffices @all_functions); "scalbn", "sin", "sincos", "sinh", "sqrt", "tan", "tanh", "tgamma", "trunc", "y0", "y1", "yn" ); # fpclassify, isnormal, isfinite, isinf, isnan, issignaling, -# issubnormal, signbit, isgreater, isgreaterequal, isless, +# issubnormal, iszero, signbit, isgreater, isgreaterequal, isless, # islessequal, islessgreater, isunordered are not tabulated. if ($#ARGV == 0) { diff --git a/math/libm-test.inc b/math/libm-test.inc index 385ec5c..872bafd 100644 --- a/math/libm-test.inc +++ b/math/libm-test.inc @@ -46,7 +46,7 @@ cbrt, ceil, copysign, cos, cosh, drem, erf, erfc, exp, exp10, exp2, expm1, fabs, fdim, finite, floor, fma, fmax, fmin, fmod, fpclassify, frexp, gamma, hypot, - ilogb, isfinite, isinf, isnan, isnormal, issignaling, issubnormal, + ilogb, isfinite, isinf, isnan, isnormal, issignaling, issubnormal, iszero, isless, islessequal, isgreater, isgreaterequal, islessgreater, isunordered, j0, j1, jn, ldexp, lgamma, log, log10, log1p, log2, logb, @@ -8671,6 +8671,31 @@ isunordered_test (void) ALL_RM_TEST (isunordered, 1, isunordered_test_data, RUN_TEST_LOOP_ff_i_tg, END); } +static const struct test_f_i_data iszero_test_data[] = + { + TEST_f_b (iszero, 0, 1, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), + TEST_f_b (iszero, minus_zero, 1, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), + TEST_f_b (iszero, 10, 0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), + TEST_f_b (iszero, min_subnorm_value, 0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), + TEST_f_b (iszero, -min_subnorm_value, 0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), + TEST_f_b (iszero, min_value, 0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), + TEST_f_b (iszero, -min_value, 0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), + TEST_f_b (iszero, max_value, 0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), + TEST_f_b (iszero, -max_value, 0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), + TEST_f_b (iszero, plus_infty, 0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), + TEST_f_b (iszero, minus_infty, 0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), + TEST_f_b (iszero, qnan_value, 0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), + TEST_f_b (iszero, -qnan_value, 0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), + TEST_f_b (iszero, snan_value, 0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), + TEST_f_b (iszero, -snan_value, 0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), + }; + +static void +iszero_test (void) +{ + ALL_RM_TEST (iszero, 1, iszero_test_data, RUN_TEST_LOOP_f_b_tg, END); +} + static const struct test_f_f_data j0_test_data[] = { /* j0 is the Bessel function of the first kind of order 0 */ @@ -12694,6 +12719,7 @@ main (int argc, char **argv) isnormal_test (); issignaling_test (); issubnormal_test (); + iszero_test (); signbit_test (); /* Trigonometric functions: */ diff --git a/math/math.h b/math/math.h index 064cc56..0a09959 100644 --- a/math/math.h +++ b/math/math.h @@ -331,6 +331,13 @@ enum /* Return nonzero value if X is subnormal. */ # define issubnormal(x) (fpclassify (x) == FP_SUBNORMAL) + +/* Return nonzero value if X is zero. */ +# ifdef __SUPPORT_SNAN__ +# define iszero(x) (fpclassify (x) == FP_ZERO) +# else +# define iszero(x) ((x) == 0) +# endif #endif /* Use IEC_60559_BFP_EXT. */ #ifdef __USE_MISC |