Timothy C Prince wrote: > I suppose it helps a little, because broken binutils I have seen had older versions than that. Somewhere along the line, if you said what environment you were using, I missed it. It looks like others have figured out you were using mingw32, with which I have relatively little experience. I haven't looked to see whether mingw binutils is generally built with only 4-byte alignment support, as cygwin used to be. Not only did that break SSE, it made doubles slow. I don't think binutils is of any relevance in this case because the problem revolves around the alignment of the stack created by a call to CreateThread at runtime, and has nothing to do with the alignment of text/data/bss sections set by the linker in the binary. The only reason it isn't a problem in the main thread is because the MinGW startup takes care of setting the alignment before calling main. Brian
