[PR54551] global dead debug pseudo tracking in fast-dce

[Alexandre Oliva]

On Sep 25, 2012, Jakub Jelinek <jakub@redhat.com> wrote:

> On Sun, Sep 23, 2012 at 07:59:37AM -0300, Alexandre Oliva wrote:
>> This patch introduces a global mode of dead_debug tracking for use in
>> fast DCE.  If a debug use reaches the top of a basic block before
>> finding its death point, the pending and subsequent uses of the pseudo
>> in debug insns will all be substituted with the same debug temp, and
>> death points will get the value bound to the debug temp.

> Thanks for working on this.  The patch generally looks good, just some minor
> nits below.

Here's the revised version with all the nits fixed.

Regstrapped on x86_64-linux-gnu and i686-linux-gnu.  I'm checking it
in momentarily.

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Alexandre Oliva, freedom fighter    http://FSFLA.org/~lxoliva/
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