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Re: Cleanups for the m68k backend
- From: Hans-Peter Nilsson <hp at bitrange dot com>
- To: Richard Henderson <rth at redhat dot com>
- Cc: bernie at develer dot com, <gcc at gcc dot gnu dot org>
- Date: Tue, 8 Jul 2003 10:15:30 -0400 (EDT)
- Subject: Re: Cleanups for the m68k backend
On Mon, 7 Jul 2003, Richard Henderson wrote:
> Even better would be to update the m68k port to emit prologues
> as rtl instead of as text. Yes, I know scheduling is more or
> less pointless on these machines, but we'd like to eventually
> *elimitate* prologue-as-text for maintainence, validation, and
> other assorted reasons.
Changing prologue from text to rtl causes unnecessary .eh_frame
growth; unnecessary at least in absence of
-fasynchronous-exceptions. There really needs to be support for
collapsed .eh_frame dwarf2 prologue info for exceptions, i.e.
not forcibly filled with dw2_advance_loc4:s (sp?). With the
dwarf2out_* interface, you could at least control the label
positions. I see m68k would be affected; it emits register save
information in chunks corresponding to multiple instructions,
with one label per chunk.
brgds, H-P