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-rw-r--r--doc/posix-functions/ilogbl.texi4
1 files changed, 4 insertions, 0 deletions
diff --git a/doc/posix-functions/ilogbl.texi b/doc/posix-functions/ilogbl.texi
index a038376f88..dab44c8367 100644
--- a/doc/posix-functions/ilogbl.texi
+++ b/doc/posix-functions/ilogbl.texi
@@ -16,6 +16,10 @@ This function returns a wrong result for a zero argument on some platforms:
@c https://cygwin.com/ml/cygwin/2019-12/msg00074.html
Cygwin 2.9.
@item
+This function returns a wrong result for a NaN argument on some platforms:
+@c https://cygwin.com/pipermail/cygwin/2023-April/253511.html
+Cygwin 3.4.6.
+@item
This function returns a wrong result for denormalized arguments on some platforms:
AIX 7.1 64-bit, Haiku 2017.
@end itemize