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| optimizing compilers for low power design idatarm@gmail.com (2014-06-15) |
| Re: optimizing compilers for low power design kaz@kylheku.com (Kaz Kylheku) (2014-06-15) |
| Re: optimizing compilers for low power design ivan@ootbcomp.com (Ivan Godard) (2014-06-15) |
| Re: optimizing compilers for low power design Pidgeot18@verizon.com.invalid (2014-06-15) |
| Re: optimizing compilers for low power design derek@_NOSPAM_knosof.co.uk (Derek M. Jones) (2014-06-16) |
| Re: optimizing compilers for low power design walter@bytecraft.com (Walter Banks) (2014-06-16) |
| Re: optimizing compilers for low power design gneuner2@comcast.net (George Neuner) (2014-06-18) |
| Re: optimizing compilers for low power design andrewchamberss@gmail.com (2014-06-20) |
| Re: optimizing compilers for low power design gah@ugcs.caltech.edu (glen herrmannsfeldt) (2014-06-20) |
| Re: optimizing compilers for low power design ivan@ootbcomp.com (Ivan Godard) (2014-06-20) |
| Re: optimizing compilers for low power design genew@telus.net (Gene Wirchenko) (2014-06-20) |
| [1 later articles] |
| From: | "Derek M. Jones" <derek@_NOSPAM_knosof.co.uk> |
| Newsgroups: | comp.compilers |
| Date: | Mon, 16 Jun 2014 12:11:32 +0100 |
| Organization: | virginmedia.com |
| References: | 14-06-003 14-06-004 |
| Keywords: | optimize, architecture, comment |
| Posted-Date: | 16 Jun 2014 11:55:42 EDT |
Kaz,
> Furthermore, even if power cost is real, and you choose instructions according
> to power cost, it's not going to work because instructions have to be primarily
> chosen according to the computation that needs to be done.
There has been some interesting work on making power minimization
a constraint during instruction scheduling.
A surprising percentage of power is consumed when a signal changes from
0 to 1 or from 1 to 0. So the idea is to arrange instruction order to
minimise the number of transitions at each bit position in an
instruction sequence.
[CMOS only uses power when it switches, so I'd think approximately all
of the power would be consumed when a signal changes. The idea of
Gray coded instruction streams is weirdly appealing. -John]
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