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

[Martin Liška]

On 10/31/19 2:16 PM, Martin Liška wrote:
> 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
> 

+ the patch.

Martin
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