Re: How do you emit RTL for a jump to a mem/symbol instead of an asm label?

[Jeff Law <law at redhat dot com>]

On 08/20/2016 06:01 AM, Daniel Santos wrote:
> I have been unable to figure out how to (correctly) generate RTL (in
> expand the pro/epilogue pass) to jump to a stub defined in libgcc for
> the out-of-lined epilogue. If I write it as a function call, but then
> set the insn's jump field to true it emits the correct jump asm, but
> then it thinks it's a sibling call epilogue and it screws up other
> things (just read up on the sibling call optimization earlier).
>
> Basically, it should replace the function's ret with a jmp to the
> outlined epilogue that will do the ret. Any pointers greatly appreciated!
When I did this on the mn102, I created a "prologue" and "epilogue" insn 
that did not expose the details.  Look at how unspecs are used.

Then use emit_insn (gen_prologue (...)) and emit_jump_insn 
(gen_epilogue)) or something along those lines.

jeff