digitalmars.D - What CPU does DMD optimize for?
- Def <Def_member pathlink.com> Feb 19 2006
- "Walter Bright" <newshound digitalmars.com> Feb 19 2006
- pmoore <pmoore_member pathlink.com> Feb 20 2006
- "Lionello Lunesu" <lio remove.lunesu.com> Feb 20 2006
- "Walter Bright" <newshound digitalmars.com> Feb 20 2006
- Alexander Panek <alexander.panek brainsware.org> Feb 20 2006
- Def <Def_member pathlink.com> Feb 21 2006
- Trevor Parscal <Trevor_member pathlink.com> Feb 21 2006
- "Walter Bright" <newshound digitalmars.com> Feb 21 2006
- pmoore <pmoore_member pathlink.com> Feb 21 2006
- "Walter Bright" <newshound digitalmars.com> Feb 23 2006
- Def <Def_member pathlink.com> Feb 22 2006
- =?ISO-8859-1?Q?Anders_F_Bj=F6rklund?= <afb algonet.se> Feb 22 2006
- Niko Korhonen <niktheblak hotmail.com> Feb 23 2006
Hello, I assume that DMD generates code for 386 and higher. Is this correct? If so, what processor will DMD optimize the code for if the -O option is invoked?
Feb 19 2006
"Def" <Def_member pathlink.com> wrote in message news:dtau3r$7i5$1 digitaldaemon.com...Hello, I assume that DMD generates code for 386 and higher. Is this correct? If so, what processor will DMD optimize the code for if the -O option is invoked?
Pentium 6
Feb 19 2006
Hi, I was wondering the same thing. I assume you mean Pentium Pro. Am I right in thinking that this is the case for optimized and unoptimized code generation and that DMC does not emit SSE instructions? In article <dtbb0k$ju7$1 digitaldaemon.com>, Walter Bright says..."Def" <Def_member pathlink.com> wrote in message news:dtau3r$7i5$1 digitaldaemon.com...Hello, I assume that DMD generates code for 386 and higher. Is this correct? If so, what processor will DMD optimize the code for if the -O option is invoked?
Pentium 6
Feb 20 2006
"Lionello Lunesu" <lio remove.lunesu.com> Hi, I really wouldn't know, but don't count on it.. SSE instructions are useful is some very specific cases. I was surprised when I saw that Microsoft's VC8 compiler emits SSE instructions, but found out that the program (3D visualisation using OpenGL) ran slower with that feature turned on. SSE, as MMX and the other SSE's, is really meant to be written using inline assembly, when the programmer knows where to do batch operations on big arrays. L. "pmoore" <pmoore_member pathlink.com> wrote in message news:dtccf9$1lh4$1 digitaldaemon.com...Hi, I was wondering the same thing. I assume you mean Pentium Pro. Am I right in thinking that this is the case for optimized and unoptimized code generation and that DMC does not emit SSE instructions? In article <dtbb0k$ju7$1 digitaldaemon.com>, Walter Bright says..."Def" <Def_member pathlink.com> wrote in message news:dtau3r$7i5$1 digitaldaemon.com...Hello, I assume that DMD generates code for 386 and higher. Is this correct? If so, what processor will DMD optimize the code for if the -O option is invoked?
Pentium 6
Feb 20 2006
"pmoore" <pmoore_member pathlink.com> wrote in message news:dtccf9$1lh4$1 digitaldaemon.com...I was wondering the same thing. I assume you mean Pentium Pro. Am I right in thinking that this is the case for optimized and unoptimized code generation and that DMC does not emit SSE instructions?
That's right.
Feb 20 2006
Walter Bright wrote:"Def" <Def_member pathlink.com> wrote in message news:dtau3r$7i5$1 digitaldaemon.com...Hello, I assume that DMD generates code for 386 and higher. Is this correct? If so, what processor will DMD optimize the code for if the -O option is invoked?
Pentium 6
I wonder if that was a joke, or not...if it was, it's funny. <g> If not, what the hell is a Pentium 6? I guess a 686..? Regards, Alex
Feb 20 2006
Thanks heaps for your answer so far, but still...: In article <dtbb0k$ju7$1 digitaldaemon.com>, Walter Bright says..."Def" <Def_member pathlink.com> wrote in message news:dtau3r$7i5$1 digitaldaemon.com...Hello, I assume that DMD generates code for 386 and higher. Is this correct?
This question remains unanswered. I assume 386 and higher, but is it correct? It is important to mark my apps to the end user as "needs 386 or higher" or whatever.If so, what processor will DMD optimize the code for if the -O option is invoked?
Pentium 6
This is an unusual term, for me at least. If, for example, we refer to http://en.wikipedia.org/wiki/Pentium_1 then which processor is the one you mean exactly? Def
Feb 21 2006
In article <dtf8t0$1uh4$1 digitaldaemon.com>, Def says...Thanks heaps for your answer so far, but still...: In article <dtbb0k$ju7$1 digitaldaemon.com>, Walter Bright says..."Def" <Def_member pathlink.com> wrote in message news:dtau3r$7i5$1 digitaldaemon.com...Hello, I assume that DMD generates code for 386 and higher. Is this correct?
This question remains unanswered. I assume 386 and higher, but is it correct? It is important to mark my apps to the end user as "needs 386 or higher" or whatever.If so, what processor will DMD optimize the code for if the -O option is invoked?
Pentium 6
This is an unusual term, for me at least. If, for example, we refer to http://en.wikipedia.org/wiki/Pentium_1 then which processor is the one you mean exactly? Def
Although I have no clue which CPU DMD optimizes for - it makes me think - would it be possible (sorry, don't mean to just invent features for walter to build here) to have some predefined versions that corespond to the cpu flags should there ever be any added? AKA - if -OPentium4 is ever an option, than "version = Pentium4" or however walter would prefer to format it - that way our code could take the compilation perameters and do something usefull with it as well - like when using inline ASM to optimize for a CPU... Anyhoo - just a thought. Thanks, Trevor Parscal
Feb 21 2006
"Def" <Def_member pathlink.com> wrote in message news:dtf8t0$1uh4$1 digitaldaemon.com...This question remains unanswered. I assume 386 and higher, but is it correct? It is important to mark my apps to the end user as "needs 386 or higher" or whatever.
Yes, it's 386 or higher.If so, what processor will DMD optimize the code for if the -O option is invoked?
Pentium 6
This is an unusual term, for me at least. If, for example, we refer to http://en.wikipedia.org/wiki/Pentium_1 then which processor is the one you mean exactly?
Pentium Pro.
Feb 21 2006
Walter, Does DMC actually emit any Pentium Pro instructions eg. CMOV, FCMOV? If not I would class it as 486 or higher as it definitely _does_ require a FPU. In article <dtfpdh$2gih$2 digitaldaemon.com>, Walter Bright says..."Def" <Def_member pathlink.com> wrote in message news:dtf8t0$1uh4$1 digitaldaemon.com...This question remains unanswered. I assume 386 and higher, but is it correct? It is important to mark my apps to the end user as "needs 386 or higher" or whatever.
Yes, it's 386 or higher.If so, what processor will DMD optimize the code for if the -O option is invoked?
Pentium 6
This is an unusual term, for me at least. If, for example, we refer to http://en.wikipedia.org/wiki/Pentium_1 then which processor is the one you mean exactly?
Pentium Pro.
Feb 21 2006
"pmoore" <pmoore_member pathlink.com> wrote in message news:dtft1s$2kee$1 digitaldaemon.com...Walter, Does DMC actually emit any Pentium Pro instructions eg. CMOV, FCMOV?
No.If not I would class it as 486 or higher as it definitely _does_ require a FPU.
An FPU is not required, as Win32 will emulate the FPU on a 386 if there isn't one. This *could* be a problem on the DOS32 system, but DMC will generate calls to its own emulator for that. Also, the 386 did have a 387 FPU available for it.
Feb 23 2006
Walter, thanks for clarifying this. - Def In article <dtfpdh$2gih$2 digitaldaemon.com>, Walter Bright says..."Def" <Def_member pathlink.com> wrote in message news:dtf8t0$1uh4$1 digitaldaemon.com...This question remains unanswered. I assume 386 and higher, but is it correct? It is important to mark my apps to the end user as "needs 386 or higher" or whatever.
Yes, it's 386 or higher.If so, what processor will DMD optimize the code for if the -O option is invoked?
Pentium 6
This is an unusual term, for me at least. If, for example, we refer to http://en.wikipedia.org/wiki/Pentium_1 then which processor is the one you mean exactly?
Pentium Pro.
Feb 22 2006
Walter Bright wrote:This question remains unanswered. I assume 386 and higher, but is it correct? It is important to mark my apps to the end user as "needs 386 or higher" or whatever.
Yes, it's 386 or higher.If so, what processor will DMD optimize the code for if the -O option is invoked?
Pentium 6
This is an unusual term, for me at least. If, for example, we refer to http://en.wikipedia.org/wiki/Pentium_1 then which processor is the one you mean exactly?
Pentium Pro.
In case anyone wonders, the equivalent flags for GDC are: Old style: -march=i386 -mcpu=i686 New style: -march=i386 -mtune=pentium4 (as used by RPM, which builds as .i386.rpm by default even though usually a Pentium or better is required in practice) Where: i586 == pentium i686 == pentiumpro http://gcc.gnu.org/onlinedocs/gcc-4.0.2/gcc/i386-and-x86_002d64-Options.html --anders
Feb 22 2006
Walter Bright wrote:Hello, I assume that DMD generates code for 386 and higher. Is this correct? If so, what processor will DMD optimize the code for if the -O option is invoked?
Pentium 6
Wow! And we're currently at Pentium 4! Talk about bleeding edge! I just had to say it <g> -- Niko Korhonen SW Developer
Feb 23 2006