How does D cope with aliasing
I'm currently using a lot of pointers to perform heavy computation Has D the equivalent for C's restrict ? More generally, how does D cope with the aliasing of pointers ? I think it's crucial for the code optimizer.
Re: How does D cope with aliasing
On Sat, Sep 5, 2009 at 3:49 AM, #poncealil...@gmail.com wrote: I'm currently using a lot of pointers to perform heavy computation Has D the equivalent for C's restrict ? More generally, how does D cope with the aliasing of pointers ? I think it's crucial for the code optimizer. It doesn't.
Trying to get DMD bundled with libs
I noticed you can get DMD bundled with various libraries. I found you had to login to another web site, but the registery page has 3 must fill in textbox's that are crazy.
A writefln issue or a Thread issue?
Given below code:
module testWin32Process;
import win32.windows;//get
from:http://www.dsource.org/projects/bindings/wiki/WindowsApi
import std.string;
import std.conv;
import std.stdio;
import core.stdc.stdlib;
string startupProcess()
{
STARTUPINFO si;
si.cb=si.sizeof;
PROCESS_INFORMATION pi;
char* szCommandLine=cast(char*)toStringz(cmd/*notepad
testWin32Process.d*/);
si.dwFlags=STARTF_USESHOWWINDOW;
si.wShowWindow=true;
int bRet=CreateProcess(
null,
szCommandLine,
null,
null,
false,
CREATE_NEW_CONSOLE,
null,
null,
si,
pi);
if(bRet)
{
CloseHandle(pi.hThread);
return std.string.format(New process ID:%d\n
Host process ID:%d\n,
pi.dwProcessId,
pi.dwThreadId);
}
else
{
return Do not know what happend.;//just want to check
}
}
int main(string[] args)
{
writefln(%s\n,toStringz(startupProcess)); // prints blank!!!
MessageBox(null,toStringz(startupProcess),toStringz(result?),0);//prints
contents as expected!!
system(pause);
return 0;
}
As commented,were I use writefln(...),it prints blank;were I use MessageBox,it
prints well as expected:
New Process ID:2216
Host Process ID:2456
Could anybody here figure me out what the problem is?Thanks in advance.
Regards,
Sam
Re: A writefln issue or a Thread issue?
Fyi: 1.with DMD2032 under windows xp; 2.Tried printf,write,writeln,writef,writefln but all the same result:blank DOS console under current exe path; 3.In c/c++ it opens total 2 DOS windows which works properly: the main one and the one created by CREATE_NEW_CONSOLE ;but in D it opens total 3 DOS consoles,the main one and 2 blank consoles which were created by CREATE_NEW_CONSOLE,both under current exe path.
Re: Trying to get DMD bundled with libs
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Joel Christensen wrote: I noticed you can get DMD bundled with various libraries. I found you had to login to another web site, but the registery page has 3 must fill in textbox's that are crazy. Where's that? AFAIK nobody has permission to distribute DMD other than Walter. - -- My enormous talent is exceeded only by my outrageous laziness. http://www.ssTk.co.uk -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.7 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iD8DBQFKokMqT9LetA9XoXwRAovPAJ9Z66+VmFBr5rfOPPD0N2I3Sl2BIgCdFryR /a05uGyeyprp/bYWOn60HiU= =Thos -END PGP SIGNATURE-
Re: A writefln issue or a Thread issue?
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Sam Hu wrote: Fyi: 1.with DMD2032 under windows xp; 2.Tried printf,write,writeln,writef,writefln but all the same result:blank DOS console under current exe path; 3.In c/c++ it opens total 2 DOS windows which works properly: the main one and the one created by CREATE_NEW_CONSOLE ;but in D it opens total 3 DOS consoles,the main one and 2 blank consoles which were created by CREATE_NEW_CONSOLE,both under current exe path. writefln(%s\n,toStringz(startupProcess)); // prints blank!!! the toStringz in the writefln is wrong. You've already returned a string from startupProcess. The toStringz returns a char* which writefln is printing as a pointer, so you are seeing something like '974f40' being printed instead of the message you where expecting. - -- My enormous talent is exceeded only by my outrageous laziness. http://www.ssTk.co.uk -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.7 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iD8DBQFKokgaT9LetA9XoXwRArHUAJ4yTRoDqyrPlcCk5cdCZ7Yw2+iTSACg0u9w 3tpmYa8ftFEVErLMInIkb1k= =RgrL -END PGP SIGNATURE-
Re: How does D cope with aliasing
#ponce: I'm currently using a lot of pointers to perform heavy computation Has D the equivalent for C's restrict ? More generally, how does D cope with the aliasing of pointers ? I think it's crucial for the code optimizer. DMD probably just doesn't perform such optimizations. LLVM that's under LDC is probably able to perform such optimizations, but in the language there is no way to give such semantics to the compiler. My suggestion for you is to ask for such feature in the main D newsgroup, and/or in bugzilla. In the meantime you can also ask such feature to LDC developers, they may just add a small LDC-specific pragma that gives such semantics to the LLVM (in future, when D will add such annotation LDC developers will just change the syntax of this feature). (I'll ask to LDC developers to see what they think). Bye, bearophile
Re: Trying to get DMD bundled with libs
On Sat, Sep 5, 2009 at 6:53 AM, div0d...@users.sourceforge.net wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Joel Christensen wrote: I noticed you can get DMD bundled with various libraries. I found you had to login to another web site, but the registery page has 3 must fill in textbox's that are crazy. Where's that? AFAIK nobody has permission to distribute DMD other than Walter. Some others are allowed to distribute DMD (the Tango team, I think the EasyD thing), but I've never heard of a site requiring you to fill out info to get it.
Re: How does D cope with aliasing
#ponce wrote: I'm currently using a lot of pointers to perform heavy computation Has D the equivalent for C's restrict ? More generally, how does D cope with the aliasing of pointers ? I think it's crucial for the code optimizer. My recollection of reading the spec is that a D compiler is allowed to optimise by assuming no pointer aliasing. But I can't remember at the moment where I read this. But in the absence of this, you can use contracts to guard against at least the simplest forms of aliasing. Stewart.
Re: Trying to get DMD bundled with libs
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Jarrett Billingsley wrote: On Sat, Sep 5, 2009 at 6:53 AM, div0d...@users.sourceforge.net wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Joel Christensen wrote: I noticed you can get DMD bundled with various libraries. I found you had to login to another web site, but the registery page has 3 must fill in textbox's that are crazy. Where's that? AFAIK nobody has permission to distribute DMD other than Walter. Some others are allowed to distribute DMD (the Tango team, I think the EasyD thing), but I've never heard of a site requiring you to fill out info to get it. Sounds like it's time to sharpen the pitch forks! - -- My enormous talent is exceeded only by my outrageous laziness. http://www.ssTk.co.uk -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.7 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iD8DBQFKows2T9LetA9XoXwRAo5FAJ9asn8ovwg/E8KpfAWkjbQPswnPKQCgl74j nF9/sPrk/jvcC7XA4wa3sNI= =jCAv -END PGP SIGNATURE-
