* Re: aix4.1 alias problem
@ 1997-11-06 1:06 Christian Iseli
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From: Christian Iseli @ 1997-11-06 1:06 UTC (permalink / raw)
To: law, mengel; +Cc: egcs
> Well, it's the same basic problem as Christian ran into, except
> that the scheduler has moved things around in such a way that
> the copy out of the arg register appears after the function begin
> note.
>
> ...
>
> The other possibility is to set reg_seen for all the registers
> which might hold values at function entry. This might be overly
> pessimistic and defeat the entire purpose of tracking argument
> values for alias purposes. But should be 100% safe.
How about trying to do some clever walking through the reg_base_value
table, detecting cycles after the first loop iteration, and avoiding
to cycle during subsequent iterations of the loop?
Christian
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