[fpc-devel] Patch to speed up Uppercase/Lowercase functions

[L505]

http://dennishomepage.gugs-cats.dk/LowerCaseChallenge.htm

LowerCaseShaPas2_c
This one here is in Pascal, using GOTO and LABEL which consistently work fast on
both -Og and -OG
But no one wants to maintain a GOTO and a LABEL..

[LowerCaseShaPas2_c] was slightly slower than [lowercase 6 ] (second fastest)
in -OG  mode
[LowerCaseShaPas2_c] was slightly faster than [lowercase 9] (still second
fastest)  in -Og  mode .. so it's more consistent across compiler options it
seemed

So maybe [lowercase 6 ] result should be submitted to fastcode to be tested?

Also, if no one wants to use the assembly functions and GOTO/LABEL functions in
the RTL due to code bloat/maintenance, we could always offer an optional unit
where people could call the fast functions only if they needed them badly.
Just like how fastcode does, external from the VCL.

----- Original Message -----
From: "Martin Schreiber" <fpmse at bluewin.ch>
To: "FPC developers' list" <fpc-devel at lists.freepascal.org>
Sent: Saturday, June 11, 2005 9:29 PM
Subject: Re: [fpc-devel] Patch to speed up Uppercase/Lowercase functions


On Sunday 12 June 2005 00.23, Jonas Maebe wrote:
> Try also with register variables on (-O???r), it will probably more
> closely match Kylix' results then in case of the loop versions.

Kylix:
lowercase execution time: 336887
lowercase 1 execution time: 380923
lowercase 2 execution time: 375411
lowercase 3 execution time: 369814
lowercase 4 execution time: 320665
lowercase 5 execution time: 300580
lowercase 6 execution time: 219047
lowercase 7 execution time: 356606
lowercase 8 execution time: 249913
lowercase 9 execution time: 252431

-OG1r
lowercase   execution time: 465596
lowercase 1 execution time: 378780
lowercase 2 execution time: 389711
lowercase 3 execution time: 375878
lowercase 4 execution time: 225029
lowercase 5 execution time: 228708
lowercase 6 execution time: 158026
lowercase 7 execution time: 264930
lowercase 8 execution time: 182939
lowercase 9 execution time: 165446

-OG2r
lowercase   execution time: 471705
lowercase 1 execution time: 378160
lowercase 2 execution time: 388112
lowercase 3 execution time: 395773
lowercase 4 execution time: 227191
lowercase 5 execution time: 227925
lowercase 6 execution time: 156750
lowercase 7 execution time: 258313
lowercase 8 execution time: 181842
lowercase 9 execution time: 165069

-Og1r
lowercase   execution time: 464843
lowercase 1 execution time: 486571
lowercase 2 execution time: 463269
lowercase 3 execution time: 472342
lowercase 4 execution time: 247544
lowercase 5 execution time: 399030
lowercase 6 execution time: 646651
lowercase 7 execution time: 263588
lowercase 8 execution time: 636059
lowercase 9 execution time: 170660

-Og2r
lowercase   execution time: 470038
lowercase 1 execution time: 487086
lowercase 2 execution time: 459035
lowercase 3 execution time: 476304
lowercase 4 execution time: 243678
lowercase 5 execution time: 399953
lowercase 6 execution time: 646284
lowercase 7 execution time: 265147
lowercase 8 execution time: 632796
lowercase 9 execution time: 169471

Martin

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