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Hi Thanks for the info, it led to the source of the error I was having. I was using llvm-gcc binaries (built with mingw I guess) to compile a .c file that is my language runtime, llvm-link'ing that with my frontend's .ll, and using an vcpp-built lli to run the resulting bytecode. This caused the special case in X86RegisterInfo::emitPrologue for "main" to try to align the stack

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Hello, Scott. > Checking the assembly from llc, the first alloca call is to allocate > local vars in _main. Is this just the state of the code at 2.0 when > built with vs.net, or is there something that I've managed to > mis-build locally? _alloca is used to probe the stack, if you asks for locals of size more that 4k. This is pretty ugly, but the names of this functions differs