On Thursday 02 of June 2011 22:36:53 Florian Klämpfl wrote:
Am 01.06.2011 22:07, schrieb Michalis Kamburelis:
Hi,
In my tests, FPC 2.4.4 has much slower CompareMem than FPC 2.4.2, at
least for some cases:
I've commited an improved version in r17642
Is this merged in 2.4.5 ?
zeljko
Am 03.06.2011 03:06, schrieb Michalis Kamburelis:
Florian Klämpfl wrote:
Am 01.06.2011 22:07, schrieb Michalis Kamburelis:
Hi,
In my tests, FPC 2.4.4 has much slower CompareMem than FPC 2.4.2, at
least for some cases:
I've commited an improved version in r17642
That's great :) I just
Florian Klämpfl wrote:
I improved CompareDWord as well, for your application it should be even
better.
Ha, I hesitated earlier to mention that CompareWord and CompareDWord are
~4 times slower than equivalent (on the same number of bytes)
CompareMem/CompareByte calls :) Cool, times with
On 01.06.2011 22:07, Michalis Kamburelis wrote:
Any thoughts? Maybe something can be improved?
1. Why CompareMem got slower in FPC 2.4.4? Maybe something can be fixed?
Let's see...
CompareMem in 2.4.2:
=== source begin ===
function CompareMem(P1, P2: Pointer; Length: cardinal): Boolean;
02.06.2011 19:49, Sven Barth пишет:
Maybe it's better if you or someone else would try to improve the performance
of the i386 assembler
code that makes up the Compare(Byte/Word/DWord) functions (it's located in
rtl/i386/i386.inc btw).
I tend to agree. The string instructions used there (rep
Hello FPC,
Wednesday, June 1, 2011, 10:07:18 PM, you wrote:
MK In my tests, FPC 2.4.4 has much slower CompareMem than FPC 2.4.2, at
MK least for some cases:
The difference is that CompareMem takes the same time to check a
memory block if the elements are equal or different, while the pascal
Am 02.06.2011 18:45, schrieb José Mejuto:
Hello FPC,
PlainCompare CompareByteXCompareByte
---
Equal arrays 1000 elements 16250 ms 625 ms 656 ms
Diff. arrays 1000 elements
Hello FPC,
Wednesday, June 1, 2011, 10:07:18 PM, you wrote:
MK In my tests, FPC 2.4.4 has much slower CompareMem than FPC 2.4.2, at
MK least for some cases:
Please take care with my last email, it has a bug that result in wrong
speed tests, anyway after fixing the bug, the magic number for
Hello FPC,
Thursday, June 2, 2011, 7:03:10 PM, you wrote:
FK Am 02.06.2011 18:45, schrieb José Mejuto:
Hello FPC,
PlainCompare CompareByteXCompareByte
---
Equal arrays 1000 elements 16250
Hello FPC,
Thursday, June 2, 2011, 7:03:10 PM, you wrote:
PlainCompare CompareByteXCompareByte
---
Equal arrays 1000 elements 16250 ms 625 ms 656 ms
Diff. arrays 1000 elements
Am 01.06.2011 22:07, schrieb Michalis Kamburelis:
Hi,
In my tests, FPC 2.4.4 has much slower CompareMem than FPC 2.4.2, at
least for some cases:
I've commited an improved version in r17642
___
fpc-devel maillist - fpc-devel@lists.freepascal.org
Florian Klämpfl wrote:
Am 01.06.2011 22:07, schrieb Michalis Kamburelis:
Hi,
In my tests, FPC 2.4.4 has much slower CompareMem than FPC 2.4.2, at
least for some cases:
I've commited an improved version in r17642
That's great :) I just tested with fpc from SVN (rev 17644), and can
confirm
Hi,
In my tests, FPC 2.4.4 has much slower CompareMem than FPC 2.4.2, at
least for some cases:
# with fpc 2.4.4
$ time ./compare_mem_test 1
real0m7.795s
user0m7.764s
sys 0m0.008s
# with fpc 2.4.2
$ time ./compare_mem_test 1
real0m1.218s
user0m1.216s
sys
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