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get64bitargumentgprs
2017 Apr 27
4
-msave-args backend support for x86_64
...erstanding is if a function returns a struct, the caller
is responsible for allocating space for the struct and passes a
pointer to the callee via RDI, which takes a register away from
arguments.
is that true? what's the best way to detect that in
X86FrameLowering::emitPrologue()?
2. i copied get64BitArgumentGPRs from X86ISelLowering.cpp.
i need this so i know which registers to push onto the stack and
in which order.
should i move it to X86RegisterInfo.cpp? could someone give me a
pointer on following the FIXME, ie, how could i get that stuff from
tblgen?
if anyone has some tips for me, it would be gre...