• Archibald (4/4) Jun 24 2014 Hello,
• Justin Whear (2/6) Jun 24 2014 D's inline assembler is described here: http://dlang.org/iasm.html
• Rene Zwanenburg (3/11) Jun 24 2014 There's also an intrinsic in core.bitop:
• Archibald (6/19) Jun 24 2014 Thanks for the answers.
• Justin Whear (3/8) Jun 24 2014 DMD 2.065 seems to support it. What compiler are you using and what
• Justin Whear (2/2) Jun 24 2014 Also, see:
• Archibald (5/7) Jun 24 2014 "its not documented on the inline assembler page."

"Archibald" <archiblad fake-mail.org> writes:

Hello,
I need to use the "popcnt" processor instruction in a performance 
critical section.
Is there a way to do this in D?

Justin Whear <justin economicmodeling.com> writes:

On Tue, 24 Jun 2014 16:34:42 +0000, Archibald wrote:

 Hello,
 I need to use the "popcnt" processor instruction in a performance
 critical section.
 Is there a way to do this in D?

D's inline assembler is described here: http://dlang.org/iasm.html

"Rene Zwanenburg" <renezwanenburg gmail.com> writes:

On Tuesday, 24 June 2014 at 17:05:24 UTC, Justin Whear wrote:
 On Tue, 24 Jun 2014 16:34:42 +0000, Archibald wrote:

 Hello,
 I need to use the "popcnt" processor instruction in a 
 performance
 critical section.
 Is there a way to do this in D?

 D's inline assembler is described here: 
 http://dlang.org/iasm.html

There's also an intrinsic in core.bitop:
http://dlang.org/library/core/bitop/popcnt.html

"Archibald" <archibald fake-mail.org> writes:

On Tuesday, 24 June 2014 at 17:27:09 UTC, Rene Zwanenburg wrote:
 On Tuesday, 24 June 2014 at 17:05:24 UTC, Justin Whear wrote:
 On Tue, 24 Jun 2014 16:34:42 +0000, Archibald wrote:

 Hello,
 I need to use the "popcnt" processor instruction in a 
 performance
 critical section.
 Is there a way to do this in D?

 D's inline assembler is described here: 
 http://dlang.org/iasm.html

 There's also an intrinsic in core.bitop:
 http://dlang.org/library/core/bitop/popcnt.html


Thanks for the answers.
Unfortunately it seems like popcnt isn't supported by D's inline
assembler.
What if I import it as an external C function, will I get optimal
performance?

Justin Whear <justin economicmodeling.com> writes:

On Tue, 24 Jun 2014 19:44:52 +0000, Archibald wrote:

 Thanks for the answers.
 Unfortunately it seems like popcnt isn't supported by D's inline
 assembler.
 What if I import it as an external C function, will I get optimal
 performance?

DMD 2.065 seems to support it.  What compiler are you using and what 
errors are you getting?

Justin Whear <justin economicmodeling.com> writes:

Also, see: 
http://forum.dlang.org/thread/alirjgygnwpifkijxtjo forum.dlang.org

"Archibald" <archibald fake-mail.org> writes:

On Tuesday, 24 June 2014 at 19:56:29 UTC, Justin Whear wrote:
 Also, see:
 http://forum.dlang.org/thread/alirjgygnwpifkijxtjo forum.dlang.org

"its not documented on the inline assembler page."
That's why I thought it wasn't supported, it's not in the list of 
supported opcodes.
Thanks for the help!