In a Google+ comment to my recent article about inlining in XE6, Leif Uneus posted results from Scimark.
It appears that XE6 is about 30% slower than previous versions at least from XE5 to XE for 32bits floating point.
Note that Scimark does not make use of inlining, but does make heavy use of floating-point computations, loops and arrays.
Edit: issue discussed here was reported in QC 124652 (now marked as resolved)
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First noticed by dewresearch, Delphi XE6 introduced a new optimization for inlined functions that return a floating-point value.
Here is an exploration of what was improved… and what was not improved.
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Inspired by a recent question by Bruce McGee in the Delphi non-tech forum, here are a couple of mini-polls.
Who purchase the Delphi you use?
Do you use Delphi for work, hobby or both?
Here are a few findings on Multi-Read Exclusive-Write Synchronizer from a recent upgrade of DWScript‘s GlobalVar functions.
I ran some comparisons between a plain Critical Section, Delphi’s TMultiReadExclusiveWriteSynchronizer and Windows Slim Reader/Writer Lock, of which an implementation was added to the dwsXPlatform unit.
Delphi offers two ways of enumerating files in a directory and its sub-directories, the first is the classic (and buggy) FindFirst/FindNext, the second is IOUtils TDirectory.GetFiles and not very efficient.
Here is why and how I implemented DWScript‘s dwsXPlatform.CollectFiles, and a tip about getting a small system-wide boost as a bonus.
Or in other words, before getting to the gory details, DWScript now works when compiled with {$HIGHCHARUNICODE ON} on a machine with Cyrillic code-page 1251.
DWScript was converted years ago to Unicode, and been working just fine.
But there was a leftover bug from that crossing of the Styx.
A new version 1.8.1 is available from the SamplingProfiler page.
This minor updates fixes the displayed source code for samples gathered on a generic method (“Show Source Location” option) and other minor fixes.
After looking at String concatenation and String Building in Delphi, and as a conclusion, it’s time to have a brief look at what happens in multi-threaded settings, such as in a server pushing JSON, XML or some other text data.
As a followup to the String Concatenation article, let’s take a look at a less trivial case: what if instead of concatenating a couple strings, you want to concatenate a few hundred?
Sounds like a task at which TStringBuilder should excel, but one should never assume, and always measure.
You may all know about String concatenation in Delphi, but do you know about the implicit String variables the compiler may create for you?
Along with the implicit variables come implicit exception frames, and a whole lot of hidden stack juggling, which can quickly become hidden complexity bottlenecks.