1 files changed, 3 insertions, 0 deletions
diff --git a/sysdeps/ieee754/dbl-64/wordsize-64/s_frexp.c b/sysdeps/ieee754/dbl-64/wordsize-64/s_frexp.c
index 42068f8187..4b075b7200 100644
--- a/sysdeps/ieee754/dbl-64/wordsize-64/s_frexp.c
+++ b/sysdeps/ieee754/dbl-64/wordsize-64/s_frexp.c
@@ -55,6 +55,9 @@ __frexp (double x, int *eptr)
       ix = (ix & INT64_C (0x800fffffffffffff)) | INT64_C (0x3fe0000000000000);
       INSERT_WORDS64 (x, ix);
     }
+  else
+    /* Quiet signaling NaNs.  */
+    x += x;
 
   *eptr = e;
   return x;