[tests/tsub1sp.c] Added a test by merging r12997 from the trunk, and

modified the comment to say that the bug is only in the trunk.

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/branches/4.0@12999 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 21 insertions, 0 deletions

diff --git a/tests/tsub1sp.c b/tests/tsub1sp.c
index ff3c1506b..f9f50da15 100644
--- a/tests/tsub1sp.c
+++ b/tests/tsub1sp.c
@@ -370,6 +370,26 @@ bug20180217 (mpfr_prec_t pmax)
     }
 }
 
+/* bug in revision 12985 (trunk only) with tlog and
+   GMP_CHECK_RANDOMIZE=1534111552615050 */
+static void
+bug20180813 (void)
+{
+  mpfr_t a, b, c;
+
+  mpfr_init2 (a, 194);
+  mpfr_init2 (b, 194);
+  mpfr_init2 (c, 194);
+  mpfr_set_str_binary (b, "0.10000111101000100000010000100010110111011100110100000101100111000010101000110110010101011101101011110110001000111001000010110010111010010100011011010100001010001110000101000010101110100110001000E7");
+  mpfr_set_str_binary (c, "0.10000000000000000100001111010001000000100001000101101110111001101000001011001110000101010001101100101010111011010111101100010001110010000101100101110100101000110110101000010100011100001010000101E24");
+  mpfr_sub (a, b, c, MPFR_RNDN);
+  mpfr_set_str_binary (b, "-0.11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111E23");
+  MPFR_ASSERTN(mpfr_equal_p (a, b));
+  mpfr_clear (a);
+  mpfr_clear (b);
+  mpfr_clear (c);
+}
+
 int
 main (void)
 {
@@ -377,6 +397,7 @@ main (void)
 
   tests_start_mpfr ();
 
+  bug20180813 ();
   bug20180217 (1024);
   coverage ();
   compare_sub_sub1sp ();