I hare retested the current HEAD - bc13fb41. It has the same regressions as 89a8201b. I published the diff for bc13fb41 as separate reports: http://common-lisp.net/project/cl-test-grid/ecl/2/ecl-diff-lisp-to-c.html http://common-lisp.net/project/cl-test-grid/ecl/2/ecl-diff-bytecode.html Best regards, - Anton