Where is it documented?
Are there differences with the linux ABI?

Particularly I am interested in stack alignment requirement. For example i386 Solaris, Linux and MacOS have 16 bit stack alignment for procedure calls. This is reflected in LLVM sources:

  if (isTargetDarwin() || isTargetLinux() || isTargetSolaris() || Is64Bit)
    stackAlignment = 16;


But FreeBSD is excluded there. Is this a bug in LLVM which magically doesn't cause crashes or this is correct and FreeBSD doesn't have 16 bit alignment?

Yuri
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