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Date: Wed, 13 Aug 2003 04:54:00 -0000
From: Richard Henderson <rth@redhat.com>
To: Andrew Cagney <ac131313@redhat.com>
Cc: Michal Ludvig <mludvig@suse.cz>, Daniel Jacobowitz <drow@mvista.com>,
   gdb <gdb@sources.redhat.com>
Subject: Re: [testsuite & dwarf2] How to handle store.exp failure on AMD64?
Message-ID: <20030813045405.GB11912@redhat.com>
References: <3F3212B7.8060003@suse.cz> <20030807135035.GA28000@nevyn.them.org> <3F326928.3020502@redhat.com> <20030807150201.GA29511@nevyn.them.org> <3F3275EC.3000702@redhat.com> <3F32C75D.2010007@suse.cz> <3F39B678.70409@redhat.com>
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On Tue, Aug 12, 2003 at 11:54:32PM -0400, Andrew Cagney wrote:
> I would have expected the CIE.INITIAL_INSTRUCTIONS to specify the 
> default state of all DWARF2 registers, and not just a select few.

Folks already complain unwind info is too large.

As I said, GCC's unwinder assumes DW_CFA_same_value unless otherwise
stated.  Since scratch registers aren't live across the call, it
doesn't matter that we don't mark registers DW_CFA_undefined; any
(accurate) debug information you'll find at the call site in the 
caller simply won't say that values are live in those registers.
Anything else would be a bug.

So assuming DW_CFA_same_value produces the most compact representation.


r~