[Patch] MIPS: mips16e machine patterns - zeb/zeh seb/seh

[Richard Sandiford]

David Ung <davidu@mips.com> writes:
> Looks like we've agreed to leave in the -mips16e option then.
> here is a revised patch.  I've added a few lines in the manual and now
> use GENERATE_MIPS16E instead, since TARGET_MIPS16E is already generated
> by mips.opt.

I'm a bit confused here.  I thought the two options under discussion were:

  (a) -mips16e as a separate flag.  You get MIPS16e instructions
      if and only if you use -mips16e.

  (b) -mips16 is always used to enable MIPS16(e) instructions.
      The -march setting decides whether MIPS16e is available.

(a) was what your first patch did and (b) was what I mentioned in
the review (purely for discussion purposes ;).

Like you say, the balance of opinion was that having a separate
flag was better than (b), but you now seem to have gone for a
hybrid in which -mips16 sometimes selects MIPS16 and sometimes
selects MIPS16e.  Why did you do that rather than stick with
your original?

Richard