Re: Add unwind information to mips epilogues

[Bernd Schmidt <bernds at codesourcery dot com>]

Here's a new version, which adds support for mips16 and tries to avoid
the window with the frame pointer restore.

Testing mips16 is problematic, all the execute tests fail before and
after - I interpret one of your earlier mails to say that this is
expected. There are no new compilation failures with this patch, but
incorrect earlier versions triggered a few, indicating that the testing
is at least somewhat useful.

I get the following output for restore insns:

        move    $sp,$17
        restore 8,$16,$17
$LCFI2 = .
        .cfi_remember_state
        .cfi_restore 16
        .cfi_restore 17
        .cfi_def_cfa 29, 0

which I think is correct.

Question for Richard H.: What is this actually good for, other than
presenting consistent information to dwarf2cfi? Do we actually expect
code to unwind through the middle of an epilogue?


Bernd

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