Re: [PATCH][RFC] Param to options conversion (demo).

[Martin Liška <mliska at suse dot cz>]

On 10/31/19 2:01 PM, Martin Liška wrote:
> Hi.
> 
> Based on the discussion with Honza and Richard I'm sending a proposal
> for conversion of param machinery into the existing option machinery.
> Our motivation for the change is to provide per function param values,
> similarly what 'Optimization' keyword does for options.
> 
> Right now, we support the following format:
> gcc --param=lto-partitions=4 /tmp/main.c -c
> 
> And so that I decided to name newly the params like:
> 
> -param=ipa-sra-ptr-growth-factor=
> Common Joined UInteger Var(param_ipa_sra_ptr_growth_factor) Init(2) Param Optimization
> Maximum allowed growth of number and total size of new parameters
> that ipa-sra replaces a pointer to an aggregate with.
> 
> And I learnt decoder to parse '--param' 'name=value' as '--param=name=value'. Doing that
> the transformation works. Help provides reasonable output as well:
> 
> $ ./xgcc -B. --param predictable-branch-outcome=5  /tmp/main.c -c -Q --help=param
> The --param option recognizes the following as parameters:
>   --param=ipa-sra-ptr-growth-factor= 	2
>   --param=predictable-branch-outcome=<0,50> 	5
> 
> Thoughts?
> Thanks,
> Martin
> 
> ---
>  gcc/common.opt        | 18 +++++++++++-------
>  gcc/ipa-sra.c         |  3 +--
>  gcc/opt-functions.awk |  3 ++-
>  gcc/opts-common.c     |  9 +++++++++
>  gcc/opts.c            | 36 ------------------------------------
>  gcc/params.def        | 10 ----------
>  gcc/predict.c         |  4 ++--
>  7 files changed, 25 insertions(+), 58 deletions(-)
> 
> 

I forgot to add gcc-patches to To.

Martin