[PATCH] Add zero-overhead looping for xtensa backend

Sterling Augustine augustine.sterling@gmail.com
Mon Jan 13 17:24:00 GMT 2014

On Thu, Jan 9, 2014 at 7:48 PM, Yangfei (Felix) <felix.yang@huawei.com> wrote:
> And here is the xtensa configuration tested (include/xtensa-config.h):
> #define XCHAL_HAVE_BE           0
> #define XCHAL_HAVE_LOOPS                1

Hi Felix,

I like this patch, and expect I will approve it. However, I would like
you to do two more things before I do:

1. Ensure it doesn't generate zcl's when:


2. Ensure it doesn't produce loops bodies that contain ret, retw,
ret.n or retw.n as the last instruction. It might be easier to just
disallow them in loop bodies entirely though.


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