[llvm-dev] preserve registers across function call

Marcello Maggioni via llvm-dev
Thu, 27 Aug 2015 00:58:43 -0000

Is the preserved mask passed down to your Call instruction in LowerCall ?

Marcello
> On 26 Aug 2015, at 17:52, Xiaochu Liu via llvm-dev <llvm-dev at
lists.llvm.org> wrote:
>
> Dear there,
>
> I was wondering how to preserve registers (caller saved) across calls. I
implemented getCalleeSavedRegs and getCallPreservedMask. But the
non-callee-saved registers are still not saved by caller. I want to spill these
registers in use on stack right before the call. From my understanding, the
register allocator in llvm will do the spill and restoring automatically? Is
there anything I was supposed to do to make it happen?
>
> Thanks,
> Xiaochu
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