root <mdub(a)julian.uwo.ca&gt; writes: Which compiler are you using? If you are using Gcc 2.7* you will need to add -fno-strength-reduce (if your compiler is really old), or -fno-caller-saves if your compiler is Gcc-2.7.2 or later. Both these problems are known to be fixed in GCC 2.8/EGCS. If you are using GCC 2.8 or EGCS, for safety you should probably add the flags: `-fno-risc -fno-peep-spills'. Both of those optimizations have been known to cause problems at times. Depending on the version, you should also specify `-fno-exceptions'. I'm using Pentium GCC (based on egcs-1.01) with cflags: -mpentium -march=pentium -fno-peep-spills -O6 -fno-risc -fno-exceptions and it works fine for me.