Re: Vector registers assumed to be caller or callee-saved?

What you want is not the macro but this function: https://hackage.haskell.org/package/ghc-8.6.5/docs/src/X86.Regs.html#callClo... whose results depend on the System ABI. Cheers, Andreas

Hi all,

I'm wondering what GHC assumes about vector registers XMMi, YMMi, and ZMMi used by the STG machine: are those assumed to be caller or callee-saved? Only for the x86-64 architecture there exist macro definitions like CALLER_SAVES_XMM1 in includes/stg/MachRegs.h. However, I cannot find any other place where those macros are used. AFAIK most C ABIs assume that vector registers are call clobbered. Is this also the case for GHC?

Many thanks in advance, Stefan