[fpc-devel] Optimizations

[Florian Klaempfl]

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