Re: SMS parameters

[Mostafa Hagog <MUSTAFA at il dot ibm dot com>]

Nathan Sidwell  wrote on 26/11/2004 13:02:23:

> The following sms parameters exist.
>
> max-sms-loop-number
> sms-max-ii-factor
> sms-dfa-history
> sms-loop-average-count-threshold
>
> None of these are documented in invoke.texi.

I have attached a patch for this.

>
> The first one is odd, as its help string says,
>    "Maximum number of loops to perform swing modulo scheduling on \
>      (mainly for debugging)"
> and its implementation is via a static counter that counts bbs in a
*program*
>
>    static int passes = 0;
>    ...
>    FOR_EACH_BB (bb)
>       ...
>       /* For debugging.  */
>       if ((passes++ > MAX_SMS_LOOP_NUMBER) && (MAX_SMS_LOOP_NUMBER !=
-1))
>
> it doesn't look like a particularly sensible thing to expose.

You are correct, this is used for debugging usually by gcc developers,
I use it intensively in debugging and tuning SMS.  How can we hide this
parameter from the GCC users and keep it for the developers?
In the meanwhile I didn't add documentation for this parameter to
invoke.texi

> If it must be exposed, it should probably be called
'sms-max-loop-number'.
> Notice the fence-post error there, we'll actually schedule 1 more
> than MAX_SMS_LOOP_NUMBER.

Agree.

Mostafa.

(See attached file: sms_params_doc.patch)

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