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
