The Wiert Corner – irregular stream of stuff

Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘Twitter’ Category

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More on Delphi x64 by twitter kylix_rd (Allen Bauer)

Posted by jpluimers on 2010/11/09

As a continuation of the previous assembly, the new twitter kylix_rd messages on Delphi x64 (and some reactions by Danny Thorpe):

To save people from browsing Twitter history:

kylix_rd:

Interesting x64 fun fact: RIP relative addressing. Some instructions that use a 32bit offset, are interpreted as [RIP+offs].
7 nov

@danny_thorpe Add x64 and it happens even more.
7 nov

Because of the way the Intel instructions are encoded, it is possible to encode the same effective instruction in different ways.
7 nov

You know what would have made the x64 “REX” prefix moniker even better? They could have called it T-REX.
7 nov

As much as people like to deride the aging x86 architecture, I gotta admit that AMD did a fine job of stretching it into 64bit land.
7 nov

@davidheff Undetermined. There are plenty of reasons to deliver them separately. Either way will have no impact on the results.
2 Nov

Be ready for 64 bit: In Delphi XE, this “Component.Tag := NativeInt(Self);” will just recompile in 64 bit.
2 Nov

@davidheff Oh don’t worry… there will be plenty who will find that “limiting”, if only in concept and not in the real world :-)
2 Nov

x64 Fun Fact: JMP opcodes/offsets are identical to 32bit. Can only xfer control to an address +/- 2GB away. Thus the PE image size limit.
2 Nov

danny_thorpe:

@kylix_rd I remember digging through the x64 specs. Fun times til mgmt shut it down. Still have my Amd x64 laptop circa 2003 or so.
8 nov

@kylix_rd You just noticed? :P
8 nov

davidheff:

@kylix_rd is it still on course to be a cross-compiler as announced by Nick – single 32 bit compiler that can create 32 and 64 bit images
from Stavanger, Rogaland
2 Nov Favorite Retweet Reply

@kylix_rd Actually, I wonder whether the compiler wouldn’t give out first at such a monstrous demand
from Stavanger, Rogaland
2 Nov

@kylix_rd Think most of us should be able to avoid creating 2GB images!!!!
from Stavanger, Rogaland
2 Nov

–jeroen

via Allen Bauer (kylix_rd) on Twitter
Danny Thorpe (danny_thorpe) on Twitter
David Heffernan (davidheff) on Twitter

Posted in Delphi, Development, kylix_rd, SocialMedia, Software Development, Twitter | 5 Comments »

More Delphi x64 bits – Allen Bauer (kylix_rd) on Twitter

Posted by jpluimers on 2010/11/01

To save people from browsing Twitter history:

danny_thorpe:

@davidheff @kylix_rd x64 has SSE2 for FP ops. 8 directly addressable 64bit XMM FP registers. 8087 FP ops emulated in microcode, deprecated

28 Oct

@kylix_rd You mean critical mass isn’t church service on Christmas and Easter?

27 Oct

@kylix_rd Bah. What do they know about floating point? :P MSVC turns off all the FP hardware (exceptions) by default already!

27 Oct

@kylix_rd Yes, we did. The reason was Extendeds don’t exist at all in CLR. x64 FP ops only supporting 64 bit floats is justification

27 Oct

@kylix_rd Ok, so your cause/effect statement was incomplete. :P Shame to see extendeds go. How to count all atoms in the universe now?

27 Oct

@kylix_rd That doesn’t follow. You could still pass extendeds on the stack (not using the x87 register stack)

27 Oct

kylix_rd:

@davidheff Yes. Alignment is critical. Even the stack must remain properly aligned. Its all part of the ABI.

27 Oct

@davidheff SSE instructions and the xmm0:xmm15 registers.

27 Oct

@danny_thorpe That and the fact that MS strongly discourages the use of the FP coproc on 64 bit Windows.

27 Oct

@danny_thorpe Extendeds don’t align well, FP ops would dumb them down, sub-optimal codegen, are other reasons to drop them.

27 Oct

http://goo.gl/D0Kv. “The x87 register stack is unused. … must be considered volatile across function calls” So, Extended = Double.

27 Oct

As speculated, the Tag property will become a NativeInt.

27 Oct

@malcolmgroves @seanbdurkin And if we change the underlying implementation, don’t complain… mkay?

27 Oct

The elephants in the room. Max 64bit PE image size 4GB. Extended = Double (since xmm0-xmm4 are for FP param passing).

27 Oct

Number of calling conventions in x64 – 1. pascal, register, cdecl, stdcall… gone, treated as nop.

26 Oct

Wow… just a few tweets about D64 and I get flooded with new followers. Welcome to all my new followers from the last 24 hours.

26 Oct

Most common 64bit data models, LP64 and LLP64. Windows = LLP64, Linux, OSX = LP64. D64/Windows = LLP64.

26 Oct

64bit gotcha: SizeOf(THandle/HWND/HMODULE/Hxxxx) = SizeOf(Pointer) = 8. This isn’t valid: Value := Integer(Handle).

26 Oct

Type sizes for 64: SizeOf(Integer)=4, SizeOf(NativeInt)=SizeOf(Pointer)=8,

26 Oct

If you must… Value := Integer(TList[x]) -> Value := NativeInt(TList[x]). Even better, TList.

26 Oct

via Allen Bauer (kylix_rd) on Twitter
Danny Thorpe (danny_thorpe) on Twitter

Posted in 8087, Algorithms, Delphi, Development, Floating point handling, kylix_rd, SocialMedia, Software Development, Twitter | Leave a Comment »

WordPress: New Twitter “Tweet Button” for your readers

Posted by jpluimers on 2010/08/27

Now your readers can have an easy way to tweet about your blog postings too: New Twitter “Tweet Button”.

From the post by Andy P (wordpress team):

New Twitter “Tweet Button”

…

…
When one of your readers hits the Tweet Button, they will be shown a popup that includes a shortened link to your post. Readers can add in a quick message, and then hit “Tweet” to send the post to their Twitter feed as a tweet — all without leaving your blog.
…
To enable the button on your blog please visit the “Appearance > Extras” menu and select the “Show a Twitter Tweet Button on my posts” option.

Edit: 20100901:

The WordPress team has moved the Twitter Tweet button into Settings > Sharing. In addition to that, they added sharing mechanisms for FaceBook, Press This, Reddit, Digg, StumbleUpon, Email and Print.
In addition to those, you can define your own sharing methods.
You can read more about this move here.

–jeroen

via:  New Twitter “Tweet Button” — Blog — WordPress.com.

Posted in Power User, SocialMedia, Twitter, WordPress | 2 Comments »

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