[fpc-devel] Optimizations

[Den]

Excellent work Florian! Makes me want to work on those parts of the 
compiler.. Though my current interests are in other parts of it.
But very nice. :)

On 14-01-25 04:55 PM, Florian Klämpfl wrote:
> Am 25.01.2014 23:00, schrieb Sven Barth:
>> On 25.01.2014 17:09, Florian Klaempfl wrote:
>>> Am 24.01.2014 09:32, schrieb Sven Barth:
>>>> Am 24.01.2014 02:03, schrieb Martin Frb:
>>>>> There is a bigger example, where exactly that was done, because FPCs
>>>>> optimization was not sufficient enough for what the author wanted.
>>>>> http://bugs.freepascal.org/view.php?id=10275
>>>> In that context... @Florian: how is your SSA support coming along? :)
>>> Still WIP :) But a lot of my commits from the last weeks are spin-offs
>>> of the SSA work.
>>>
>>> Together with all other improvements this results in significant better
>>> code:
>>>
>>> fpc -l -O3 sha256.pp -S2
>>> Free Pascal Compiler version 2.6.2 [2013/02/12] for i386
>>> Copyright (c) 1993-2012 by Florian Klaempfl and others
>>> Target OS: Win32 for i386
>>> Compiling sha256.pp
>>> Linking sha256.exe
>>> 74 lines compiled, 0.1 sec , 26016 bytes code, 2220 bytes data
>>>
>>> fptime sha256
>>> Expected: 3994057095, got 3994057095
>>> 483.000 ms
>>>
>>>
>>> pp -n @c:\fpc\bin\fpc.cfg -l -O4 sha256.pp -S2
>>> Free Pascal Compiler version 2.7.1 [2014/01/25] for i386
>>> Copyright (c) 1993-2013 by Florian Klaempfl and others
>>>
>>> fptime sha256
>>> Expected: 3994057095, got 3994057095
>>> 367.000 ms
>> Nice :D
>> Still looking forward to more improvements regarding SSA ^^
> Most could be probably gained in this example by moving variables into
> xmm registers if only certain kind of operations are carried out on them.
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