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Archive for the ‘kylix_rd’ Category

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 »

Signs of Delphi x64: Allen Bauer (kylix_rd) on Twitter

Posted by jpluimers on 2010/10/26

Probably a few others will blog about these tweets too.
I have bolded the most important pieces:

kylix_rd Allen Bauer

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

6 hours ago

kylix_rd Allen Bauer

Another Milestone: fixed my first legitimate 64bit RTL bug. if TryOpenForInput(t) then s/b if not TryOpenForInput(t) then

10 hours ago

kylix_rd Allen Bauer

Milestone: 64bit compiler now merged into the main dev branch! All devs are now locked and loaded!

13 hours ago

–jeroen

via Allen Bauer (kylix_rd) on Twitter.

Posted in Delphi, Development, kylix_rd, Software Development | Leave a Comment »

 
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