Real World Technologies - Forums - Thread: Risc-V getting real?

By: Doug S (foo.delete@this.bar.bar), November 6, 2019 12:47 pm

anon.1 (abc.delete@this.def.com) on November 6, 2019 11:19 am wrote:
> The whole point of RISC was to make
> decode simple. Now they want to add complexity in decode because, well, the ISA is oversimplified.

The RISC concept was created 40 years ago. Things have changed, designers have a transistor budget orders of magnitude larger today so what was appropriate for a decoder in 1980 shouldn't be a limitation on what is appropriate for a decoder in 2020.

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Topic	Posted By	Date
Risc-V getting real?	Anon	2019/10/31 03:10 PM
Risc-V getting real?	Gabriele Svelto	2019/11/01 03:28 AM
Risc-V getting real?	anon	2019/11/02 01:46 AM
Risc-V getting real?	lockederboss	2019/11/02 01:49 AM
Risc-V getting real?	Gabriele Svelto	2019/11/03 02:20 AM
Risc-V getting real?	Michael S	2019/11/03 03:03 AM
Risc-V getting real?	Gabriele Svelto	2019/11/03 04:45 AM
Risc-V getting real?	anon	2019/11/03 08:29 PM
Risc-V getting real?	Gabriele Svelto	2019/11/04 06:39 AM
Risc-V getting real?	dmcq	2019/11/04 06:41 AM
Documentation Quality	Konrad Schwarz	2019/11/04 05:43 AM
Documentation Quality	Gabriele Svelto	2019/11/04 06:31 AM
Documentation Quality	Anon	2019/11/04 12:28 PM
Trivium: Andy Glew works for SiFive	Paul A. Clayton	2019/11/01 10:51 AM
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RISC-V - incompetitive instruction set compared to ARMv8	Ronald Maas	2019/11/02 10:04 AM
RISC-V - incompetitive instruction set compared to ARMv8	Michael S	2019/11/02 03:18 PM
RISC-V - incompetitive instruction set compared to ARMv8	Adrian	2019/11/02 10:33 AM
RISC-V - incompetitive instruction set compared to ARMv8	anon	2019/11/02 10:49 AM
RISC-V - incompetitive instruction set compared to ARMv8	Wilco	2019/11/02 12:20 PM
RISC-V - incompetitive instruction set compared to ARMv8	anon	2019/11/02 01:57 PM
RISC-V - incompetitive instruction set compared to ARMv8	Ronald Maas	2019/11/03 08:58 AM
RISC-V - incompetitive instruction set compared to ARMv8	anon	2019/11/03 10:06 AM
RISC-V - incompetitive instruction set compared to ARMv8	Gabriele Svelto	2019/11/04 06:43 AM
RISC-V - incompetitive instruction set compared to ARMv8	anon	2019/11/04 07:03 AM
RISC-V - incompetitive instruction set compared to ARMv8	Gabriele Svelto	2019/11/04 07:13 AM
RISC-V - incompetitive instruction set compared to ARMv8	Michael S	2019/11/04 09:58 AM
RISC-V - incompetitive instruction set compared to ARMv8	David Hess	2019/11/04 09:57 AM
RISC-V - incompetitive instruction set compared to ARMv8	rwessel	2019/11/04 10:25 AM
RISC-V - incompetitive instruction set compared to ARMv8	David Hess	2019/11/04 10:48 AM
RISC-V - incompetitive instruction set compared to ARMv8	Wilco	2019/11/03 12:09 PM
RISC-V - incompetitive instruction set compared to ARMv8	Ronald Maas	2019/11/03 10:44 PM
RISC-V - incompetitive instruction set compared to ARMv8	Wilco	2019/11/04 04:01 PM
RISC-V - incompetitive instruction set compared to ARMv8	Gabriele Svelto	2019/11/04 04:14 PM
RISC-V - incompetitive instruction set compared to ARMv8	R	2019/11/04 11:35 PM
RISC-V - incompetitive instruction set compared to ARMv8	sylt	2019/11/03 01:35 PM
RISC-V - incompetitive instruction set compared to ARMv8	l	2019/11/03 08:26 PM
The RISC-V bitmanip ISA extension has conditional moves	Gabriele Svelto	2019/11/03 02:25 AM
The RISC-V bitmanip ISA extension has conditional moves	Wilco	2019/11/03 06:38 AM
The RISC-V bitmanip ISA extension has conditional moves	Linus Torvalds	2019/11/03 10:03 AM
The RISC-V bitmanip ISA extension has conditional moves	Gabriele Svelto	2019/11/04 06:29 AM
The RISC-V bitmanip ISA extension has conditional moves	none	2019/11/04 06:38 AM
The RISC-V bitmanip ISA extension has conditional moves	Gabriele Svelto	2019/11/04 06:45 AM
The RISC-V bitmanip ISA extension has conditional moves	none	2019/11/04 06:55 AM
The RISC-V bitmanip ISA extension has conditional moves	Gabriele Svelto	2019/11/04 07:17 AM
The RISC-V bitmanip ISA extension has conditional moves	none	2019/11/04 09:36 AM
I'm glad you're not that blind :) (NT)	none	2019/11/04 09:36 AM
The RISC-V bitmanip ISA extension has conditional moves	Gabriele Svelto	2019/11/04 10:23 AM
The RISC-V bitmanip ISA extension has conditional moves	Maynard Handley	2019/11/04 06:16 PM
The RISC-V bitmanip ISA extension has conditional moves	Gabriele Svelto	2019/11/04 11:42 PM
The RISC-V bitmanip ISA extension has conditional moves	Adrian	2019/11/05 06:25 AM
The RISC-V bitmanip ISA extension has conditional moves	Ronald Maas	2019/11/05 06:04 PM
The RISC-V bitmanip ISA extension has conditional moves	Gabriele Svelto	2019/11/06 02:21 AM
The RISC-V bitmanip ISA extension has conditional moves	dmcq	2019/11/06 03:31 AM
The RISC-V bitmanip ISA extension has conditional moves	Konrad Schwarz	2019/11/06 07:03 AM
The RISC-V bitmanip ISA extension has conditional moves	none	2019/11/06 07:57 AM
The RISC-V bitmanip ISA extension has conditional moves	Gabriele Svelto	2019/11/06 08:55 AM
The RISC-V bitmanip ISA extension has conditional moves	anon	2019/11/04 07:24 AM
The RISC-V bitmanip ISA extension has conditional moves	Gabriele Svelto	2019/11/04 04:07 PM
The RISC-V bitmanip ISA extension has conditional moves	anon	2019/11/04 05:02 PM
The RISC-V bitmanip ISA extension has conditional moves	Gabriele Svelto	2019/11/04 11:39 PM
The RISC-V bitmanip ISA extension has conditional moves	none	2019/11/05 12:45 AM
RISC-V - incompetitive instruction set compared to ARMv8	Ronald Maas	2019/11/05 05:41 PM
RISC-V - incompetitive instruction set compared to ARMv8	anonymou5	2019/11/06 12:24 AM
The RISC-V bitmanip ISA extension has conditional moves	Ronald Maas	2019/11/06 12:41 AM
The RISC-V bitmanip ISA extension has conditional moves	none	2019/11/06 01:12 AM
The RISC-V bitmanip ISA extension has conditional moves	Gabriele Svelto	2019/11/06 02:22 AM
The RISC-V bitmanip ISA extension has conditional moves	Adrian	2019/11/06 02:44 AM
The RISC-V bitmanip ISA extension has conditional moves	Adrian	2019/11/06 02:50 AM
The RISC-V bitmanip ISA extension has conditional moves	none	2019/11/06 03:08 AM
The RISC-V bitmanip ISA extension has conditional moves	Adrian	2019/11/06 07:24 AM
The RISC-V bitmanip ISA extension has conditional moves	dmcq	2019/11/06 05:53 AM
The RISC-V bitmanip ISA extension has conditional moves	noko	2019/11/06 11:07 AM
The RISC-V bitmanip ISA extension has conditional moves	Ronald Maas	2019/11/07 09:35 AM
The RISC-V bitmanip ISA extension has conditional moves	j	2019/11/05 01:43 AM
The RISC-V bitmanip ISA extension has conditional moves	dmcq	2019/11/04 05:39 PM
The RISC-V bitmanip ISA extension has conditional moves	Maynard Handley	2019/11/04 06:25 PM
The RISC-V bitmanip ISA extension has conditional moves	Anon	2019/11/04 08:31 AM
RISC-V - incompetitive instruction set compared to ARMv8	Ronal	2019/11/04 08:59 AM
RISC-V - incompetitive instruction set compared to ARMv8	dmcq	2019/11/02 03:00 PM
RISC-V - incompetitive instruction set compared to ARMv8	lockederboss	2019/11/03 09:37 AM
RISC-V - incompetitive instruction set compared to ARMv8	j	2019/11/03 03:29 PM
RISC-V - incompetitive instruction set compared to ARMv8	anon	2019/11/03 10:00 PM
RISC-V - incompetitive instruction set compared to ARMv8	j	2019/11/04 12:30 AM
RISC-V - incompetitive instruction set compared to ARMv8	Michael S	2019/11/04 02:45 AM
RISC-V - incompetitive instruction set compared to ARMv8	none	2019/11/04 03:59 AM
RISC-V - incompetitive instruction set compared to ARMv8	anon	2019/11/04 05:22 AM
RISC-V - incompetitive instruction set compared to ARMv8	Adrian	2019/11/04 06:10 AM
RISC-V - incompetitive instruction set compared to ARMv8	Michael S	2019/11/04 11:03 AM
RISC-V - incompetitive instruction set compared to ARMv8	Linus Torvalds	2019/11/04 11:27 AM
RISC-V - incompetitive instruction set compared to ARMv8	David Hess	2019/11/04 12:07 PM
RISC-V - incompetitive instruction set compared to ARMv8	Michael S	2019/11/04 01:22 PM
RISC-V - incompetitive instruction set compared to ARMv8	Linus Torvalds	2019/11/04 03:08 PM
Flags Register	David Hess	2019/11/04 11:05 AM
Flags Register	Wilco	2019/11/04 02:49 PM
Flags Register	Maynard Handley	2019/11/04 07:17 PM
Flags Register	David Hess	2019/11/05 04:35 PM
Flags Register	Wilco	2019/11/05 05:54 PM
Flags Register	Megol	2019/11/06 06:11 AM
Flags Register	Maynard Handley	2019/11/07 02:42 PM
RISC-V - instruction fusion	Anon	2019/11/06 06:40 PM
RISC-V - incompetitive instruction set compared to ARMv8	David Hess	2019/11/04 10:38 AM
RISC-V - incompetitive instruction set compared to ARMv8	Michael S	2019/11/04 10:59 AM
RISC-V - incompetitive instruction set compared to ARMv8	David Hess	2019/11/04 11:11 AM
RISC-V - incompetitive instruction set compared to ARMv8	Michael S	2019/11/04 11:17 AM
RISC-V - incompetitive instruction set compared to ARMv8	David Hess	2019/11/04 11:54 AM
RISC-V - incompetitive instruction set compared to ARMv8	anon.1	2019/11/05 07:17 AM
RISC-V - incompetitive instruction set compared to ARMv8	Linus Torvalds	2019/11/05 12:39 PM
RISC-V - incompetitive instruction set compared to ARMv8	anon.1	2019/11/06 12:19 PM
RISC-V - incompetitive instruction set compared to ARMv8	Doug S	2019/11/06 12:47 PM
RISC-V - incompetitive instruction set compared to ARMv8	David Hess	2019/11/06 07:36 PM
RISC-V - incompetitive instruction set compared to ARMv8	Maynard Handley	2019/11/06 08:32 PM
RISC-V - incompetitive instruction set compared to ARMv8	j	2019/11/07 04:33 AM
RISC-V - incompetitive instruction set compared to ARMv8	TREZA	2019/11/07 01:31 PM
RISC-V - incompetitive instruction set compared to ARMv8	David Hess	2019/11/08 08:15 PM
RISC-V - incompetitive instruction set compared to ARMv8	Maynard Handley	2019/11/08 09:40 PM
RISC-V - incompetitive instruction set compared to ARMv8	none	2019/11/09 02:02 AM
RISC-V - incompetitive instruction set compared to ARMv8	anon.1	2019/11/06 10:36 PM
The RISC-V bitmanip ISA extension has conditional moves	Ronald Maas	2019/11/07 12:53 AM
Both are excellent ISAs ?	Michael S	2019/11/07 01:58 AM
The RISC-V bitmanip ISA extension has conditional moves	dmcq	2019/11/07 05:33 AM
The RISC-V bitmanip ISA extension has conditional moves	Ronald Maas	2019/11/07 08:31 AM
The RISC-V bitmanip ISA extension has conditional moves	Adrian	2019/11/07 09:38 AM
The RISC-V bitmanip ISA extension has conditional moves	Gabriele Svelto	2019/11/08 02:32 AM
The RISC-V bitmanip ISA extension has conditional moves	anon.1	2019/11/07 06:39 PM
The RISC-V bitmanip ISA extension has conditional moves	Brett	2019/11/07 07:50 PM
The RISC-V bitmanip ISA extension has conditional moves	anon.1	2019/11/07 10:47 PM
The RISC-V bitmanip ISA extension has conditional moves	Brett	2019/11/08 03:00 PM
The RISC-V bitmanip ISA extension has conditional moves	Maynard Handley	2019/11/08 06:00 PM
The RISC-V bitmanip ISA extension has conditional moves	David Hess	2019/11/08 08:28 PM
The RISC-V bitmanip ISA extension has conditional moves	anon.1	2019/11/08 09:14 PM
RISC-V - incompetitive instruction set compared to ARMv8	G. Boniface	2019/11/07 06:59 AM
Op fusion and superscalar execution do NOT share same hardware	Heikki Kultala	2019/11/07 08:39 AM
Op fusion and superscalar execution do NOT share same hardware	Ronald Maas	2019/11/07 09:29 AM
Op fusion and superscalar execution do NOT share same hardware	anon	2019/11/07 09:37 AM
Op fusion and superscalar execution do NOT share same hardware	Wilco	2019/11/07 12:41 PM
Op fusion and superscalar execution do NOT share same hardware	Foo_	2019/11/07 12:42 PM
Op fusion and superscalar execution do NOT share same hardware	anon.1	2019/11/07 11:00 PM
RISC-V - incompetitive instruction set compared to ARMv8	wumpus	2019/11/06 05:19 PM
RISC-V - conditional branches are problematic too	Wilco	2019/11/04 02:31 PM
reg-reg branches	Michael S	2019/11/06 02:37 AM
reg-reg branches	Wilco	2019/11/07 05:55 PM
RISC-V - incompetitive instruction set compared to ARMv8	Montaray Jack	2019/11/08 02:38 AM
RISC-V - incompetitive instruction set compared to ARMv8	Gabriele Svelto	2019/11/08 07:03 AM
Risc-V getting real?	Konrad Schwarz	2019/11/20 08:12 AM

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Body:	No Text Doug S (foo.delete@this.bar.bar) on November 6, 2019 12:47 pm wrote: > anon.1 (abc.delete@this.def.com) on November 6, 2019 11:19 am wrote: > > The whole point of RISC was to make > > decode simple. Now they want to add complexity in decode because, well, the ISA is oversimplified. > > > The RISC concept was created 40 years ago. Things have changed, designers have a transistor > budget orders of magnitude larger today so what was appropriate for a decoder in 1980 > shouldn't be a limitation on what is appropriate for a decoder in 2020.
How do you spell avocado?

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