module CallConv:sig..end
The following calling convention values may be accessed with
    Llvm.function_call_conv and Llvm.set_function_call_conv. Calling
    conventions are open-ended.
val c : intc is the C calling convention.
val fast : intfast is the calling convention to allow LLVM
                              maximum optimization opportunities. Use only with
                              internal linkage.
val cold : intcold is the calling convention for
                              callee-save.
val x86_stdcall : intx86_stdcall is the familiar stdcall calling
                              convention from C.
val x86_fastcall : intx86_fastcall is the familiar fastcall calling
                              convention from C.