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| author | Bruno Haible <bruno@clisp.org> | 2021-01-06 11:06:55 +0100 |
|---|---|---|
| committer | Bruno Haible <bruno@clisp.org> | 2021-01-06 11:12:03 +0100 |
| commit | fde3f75ddc3ba2cbfa23cde1d64c5b363e2fb2d0 (patch) | |
| tree | 6e5f303a57b6a8335eebba040c3576e593af8b24 /m4/ilogbl.m4 | |
| parent | 1ac1751add634045d353c5ff1eb8f435737bc1ea (diff) | |
| download | gnulib-fde3f75ddc3ba2cbfa23cde1d64c5b363e2fb2d0.tar.gz | |
ilogbl: Fix test failures on AIX 7.1 in 64-bit mode.
* m4/ilogbl.m4 (gl_FUNC_ILOGBL_WORKS): Test also some denormalized
argument.
* doc/posix-functions/ilogbl.texi: Mention the AIX bug.
Diffstat (limited to 'm4/ilogbl.m4')
| -rw-r--r-- | m4/ilogbl.m4 | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/m4/ilogbl.m4 b/m4/ilogbl.m4 index 3575736d7c..77830c18eb 100644 --- a/m4/ilogbl.m4 +++ b/m4/ilogbl.m4 @@ -1,4 +1,4 @@ -# ilogbl.m4 serial 4 +# ilogbl.m4 serial 5 dnl Copyright (C) 2010-2021 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, @@ -71,7 +71,8 @@ AC_DEFUN([gl_FUNC_ILOGBL], ]) dnl Test whether ilogbl() works. -dnl On Cygwin 2.9, ilogb(0.0L) is wrong. +dnl On Cygwin 2.9, ilogbl(0.0L) is wrong. +dnl On AIX 7.1 in 64-bit mode, ilogbl(2^(LDBL_MIN_EXP-1)) is wrong. dnl On Haiku 2017, it returns i-2 instead of i-1 for values between dnl ca. 2^-16444 and ca. 2^-16382. AC_DEFUN([gl_FUNC_ILOGBL_WORKS], @@ -115,13 +116,22 @@ int main (int argc, char *argv[]) if (my_ilogbl (x) != FP_ILOGB0) result |= 1; } + /* This test fails on AIX 7.1 in 64-bit mode. */ + { + int i; + x = 0.5L; + for (i = LDBL_MIN_EXP - 1; i < 0; i++) + x = x * 0.5L; + if (x > 0.0L && my_ilogbl (x) != LDBL_MIN_EXP - 2) + result |= 2; + } /* This test fails on Haiku 2017. */ { int i; for (i = 1, x = (long double)1.0; i >= LDBL_MIN_EXP-100 && x > (long double)0.0; i--, x *= (long double)0.5) if (my_ilogbl (x) != i - 1) { - result |= 2; + result |= 4; break; } } @@ -131,7 +141,8 @@ int main (int argc, char *argv[]) [gl_cv_func_ilogbl_works=yes], [gl_cv_func_ilogbl_works=no], [case "$host_os" in - haiku*) gl_cv_func_ilogbl_works="guessing no" ;; + aix* | haiku*) + gl_cv_func_ilogbl_works="guessing no" ;; # Guess yes on native Windows. mingw*) gl_cv_func_ilogbl_works="guessing yes" ;; *) gl_cv_func_ilogbl_works="guessing yes" ;; |