JIT compilers for math

I am looking for a JIT compiler or a small compiler library that can be embedded in my program. I indent to use it to compile dynamically generated code that perform complex number arithmetics. The generated code are very simple in structure: no loops, no conditionals, but they can be quite long (a few MB when compiled by GCC). The performance of the resulting machine code is important, while I don't really care about the speed of compilation itself. Which JIT compiler is best for my purpose? Thanks! Detailed requirements - Support double precision complex number arithmetics - Support basic optimization - Support many CPUs (x86 and x86-64 at least) - Make use of SSE on supported CPUs - Support stack or a large set of registers for local variables - ANSI-C or C++ interface - Cross platform (mainly Linux, Unix)