Richard O'Keefe wrote:
On 29 Oct 2008, at 8:31 am, Andrew Coppin wrote:
Hi guys.
This isn't specifically to do with Haskell, but... does anybody have
any idea roughly how fast various CPU operations are?
For example, is integer arithmetic faster or slower than
floating-point? Is addition
OK, well thanks for the info.
I'm not really interested in getting down to instruction-level scheduling. I
just want to know, at a high level, will implementing my algorithm in integer
arithmetic rather than floating-point make a measurable difference to overall
program speed.
Actually,
On 30 Oct 2008, at 9:22 am, Andrew Coppin wrote:
I'm not really interested in getting down to instruction-level
scheduling. I just want to know, at a high level, will implementing
my algorithm in integer arithmetic rather than floating-point make a
measurable difference to overall program
Hi guys.
This isn't specifically to do with Haskell, but... does anybody have any
idea roughly how fast various CPU operations are?
For example, is integer arithmetic faster or slower than floating-point?
Is addition faster or slower than multiplication? How much slower are
the
On Tue, Oct 28, 2008 at 12:31 PM, Andrew Coppin
[EMAIL PROTECTED] wrote:
This isn't specifically to do with Haskell, but... does anybody have any
idea roughly how fast various CPU operations are?
Yes: it's architecture dependent. I imagine you'll need to make your
questions at least somewhat
J. Garrett Morris wrote:
On Tue, Oct 28, 2008 at 12:31 PM, Andrew Coppin
[EMAIL PROTECTED] wrote:
This isn't specifically to do with Haskell, but... does anybody have any
idea roughly how fast various CPU operations are?
Yes: it's architecture dependent. I imagine you'll need to make
On Tue, 28 Oct 2008, Andrew Coppin wrote:
Hi guys.
This isn't specifically to do with Haskell, but... does anybody have any idea
roughly how fast various CPU operations are?
Unfortunately, the knowledge I acquired for Z80 and MC68000 is no longer
of that importance today.
It's still
Well, if you want to get down to that level:
http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/25112.PDF
page 273
http://www.intel.com/design/processor/manuals/248966.pdf
Appendix C
Thomas
On Tue, Oct 28, 2008 at 7:35 PM, Andrew Coppin
[EMAIL PROTECTED]wrote:
J. Garrett
On Tue, Oct 28, 2008 at 08:55:59PM +0100, Henning Thielemann wrote:
For example, is integer arithmetic faster or slower than
floating-point?
In principle integer arithmetic is simpler and faster. But your
processor may do it in the same time.
Indeed. Usually there are more integer
On 29 Oct 2008, at 8:31 am, Andrew Coppin wrote:
Hi guys.
This isn't specifically to do with Haskell, but... does anybody have
any idea roughly how fast various CPU operations are?
For example, is integer arithmetic faster or slower than floating-
point? Is addition faster or slower than
Richard O'Keefe wrote:
Rough guesses:
integer adds, subtracts, and compares are fast,
integer multiplies and divides are much slower,
slow enough that compilers go to some trouble to
do something else when multiplying or dividing
by a constant.
Typically, these days (for both int and
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