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diff --git a/libguile/ChangeLog b/libguile/ChangeLog
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@@ -1,3 +1,12 @@
+2004-10-20  Marius Vollmer  <mvo@zagadka.de>
+
+       * sort.c (quicksort): Copy pivot out of the array while
+       constructing the partitions; it could get overwritten otherwise.
+       Because of the ultimate insertion sort, this bug did not cause
+       quicksort to fail, it just put all the burdon on the insertion
+       sort and was thus very slow.  Thanks to Rolan Orre for reporting
+       the slowness!
+       
 2004-10-19  Marius Vollmer  <marius.vollmer@uni-dortmund.de>
 
        * numbers.c (scm_i_range_error): New.