[tests/tget_set_d64.c] Improved a comment.

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@13536 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 5 insertions, 4 deletions

diff --git a/tests/tget_set_d64.c b/tests/tget_set_d64.c
index 7e23d7eef..d343ca0dd 100644
--- a/tests/tget_set_d64.c
+++ b/tests/tget_set_d64.c
@@ -485,10 +485,11 @@ noncanonical (void)
   /* The code below assumes BID. */
 #ifndef DPD_FORMAT
   /* The volatile below avoids _Decimal64 constant propagation, which is
-     buggy in various GCC versions (failure with gcc (Debian 20190719-1)
-     10.0.0 20190718 (experimental) [trunk revision 273586], but not
-     with previous GCC versions, though the are also buggy).
-     https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91226
+     buggy for non-canonical encoding in various GCC versions: failure
+     with gcc (Debian 20190719-1) 10.0.0 20190718 (experimental)
+     [trunk revision 273586]; the MPFR test was not failing with previous
+     GCC versions, but GCC versions 5 to 9 are also affected on the simple
+     testcase at: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91226
   */
   volatile _Decimal64 d = 9999999999999999.0dd;
   union mpfr_ieee_double_extract x;