diff --git a/mps/code/lii3eg.gmk b/mps/code/lii3eg.gmk
index 49a02390988..2a42bac661e 100644
--- a/mps/code/lii3eg.gmk
+++ b/mps/code/lii3eg.gmk
@@ -13,7 +13,7 @@ THREADLIB = -lpthread
 PFMDEFS = -D_REENTRANT
 
 MPMPF = ${THREADSRC} vmli.c \
-        protli.c protlii3.c proti3.c prmci3li.c sslii3.c span.c
+        protli.c protlii3.c proti3.c prmci3li.c ssixi3.c span.c
 SWPF = than.c vmli.c protsw.c prmcan.c ssan.c
 
 LIBS = -lm ${THREADLIB}
diff --git a/mps/code/lii4gc.gmk b/mps/code/lii4gc.gmk
index d428eec61c5..74845348759 100644
--- a/mps/code/lii4gc.gmk
+++ b/mps/code/lii4gc.gmk
@@ -11,7 +11,7 @@ THREADLIB = -lpthread
 PFMDEFS = -D_REENTRANT
 
 MPMPF = ${THREADSRC} vmli.c \
-        protli.c protlii3.c proti3.c prmci3li.c sslii3.c span.c
+        protli.c protlii3.c proti3.c prmci3li.c ssixi3.c span.c
 SWPF = than.c vmli.c protsw.c prmcan.c ssan.c
 
 LIBS = -lm ${THREADLIB}
diff --git a/mps/code/sslii3.c b/mps/code/sslii3.c
deleted file mode 100644
index 565872c1ab6..00000000000
--- a/mps/code/sslii3.c
+++ /dev/null
@@ -1,101 +0,0 @@
-/* sslii3.c: LINUX/INTEL STACK SCANNING
- *
- * $Id$
- * Copyright (c) 2001 Ravenbrook Limited.  See end of file for license.
- *
- *  This scans the stack and fixes the registers which may contain
- *  roots.  See <design/thread-manager/>
- *
- *  The registers edi, esi, ebx are the registers defined to be preserved
- *  across function calls and therefore may contain roots.
- *  These are pushed on the stack for scanning.
- *
- * SOURCES
- *
- * .source.callees.saves: Set of callee-saved registers taken from
- * CALL_USED_REGISTERS in <gcc-sources>/config/i386/i386.h.
- *
- * ASSUMPTIONS
- *
- * .assume.align: The stack pointer is assumed to be aligned on a word
- * boundary.
- *
- * .assume.asm.stack: The compiler must not do wacky things with the
- * stack pointer around a call since we need to ensure that the
- * callee-save regs are visible during TraceScanArea.
- *
- * .assume.asm.order: The volatile modifier should prevent movement
- * of code, which might break .assume.asm.stack.
- *
- */
-
-
-#include "mpm.h"
-
-SRCID(sslii3, "$Id$");
-
-
-/* .assume.asm.order */
-#define ASMV(x) __asm__ volatile (x)
-
-
-Res StackScan(ScanState ss, Addr *stackBot)
-{
-  Addr *stackTop;
-  Res res;
-
-  /* .assume.asm.stack */
-  ASMV("push %ebx");    /* These registers are callee-saved */
-  ASMV("push %esi");    /* and so may contain roots.  They are pushed */
-  ASMV("push %edi");    /* for scanning.  See .source.callees.saves. */
-  ASMV("mov %%esp, %0" : "=r" (stackTop) :);    /* stackTop = esp */
-
-  AVER(AddrIsAligned((Addr)stackTop, sizeof(Addr)));  /* .assume.align */
-  res = TraceScanArea(ss, stackTop, stackBot);
-
-  ASMV("add $12, %esp");  /* pop 3 regs to restore the stack pointer */
-
-  return res;
-}
-
-
-/* C. COPYRIGHT AND LICENSE
- *
- * Copyright (C) 2001-2002 Ravenbrook Limited <http://www.ravenbrook.com/>.
- * All rights reserved.  This is an open source license.  Contact
- * Ravenbrook for commercial licensing options.
- * 
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- * 
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 
- * 3. Redistributions in any form must be accompanied by information on how
- * to obtain complete source code for this software and any accompanying
- * software that uses this software.  The source code must either be
- * included in the distribution or be available for no more than the cost
- * of distribution plus a nominal fee, and must be freely redistributable
- * under reasonable conditions.  For an executable file, complete source
- * code means the source code for all modules it contains. It does not
- * include source code for modules or files that typically accompany the
- * major components of the operating system on which the executable file
- * runs.
- * 
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
- * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
- * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
- * PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT HOLDERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
- * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */