A 1980's-inspired RISC-V assembler quick reference card

Dylan McNamee

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Jun 30, 2022, 9:43:30 PM6/30/22

to RISC-V Developer Board Community

When I was first learning assembly one of my favorite type of learning resources were the tri-fold assembly reference cards, as produced for the PDP-10, Motorola 68K, and other CPUs of the era. I decided to create one for the RISC-V, attached. I used it to convert the Rust inline assembly example from x86 to RISC-V:

(compile with "rustc rv-asm.rs")

use std::arch::asm;

fn main() {

// Multiply x by 6 using shifts and adds
let mut x: u64 = 4;
unsafe {
asm!(
"addi {tmp}, {x}, 0",
"slli {tmp}, {tmp}, 1",
"slli {x}, {x}, 2",
"add {x}, {tmp}, {x}",
x = inout(reg) x,
tmp = out(reg) _,
);
}
assert_eq!(x, 4 * 6);
}

A PDF of the reference card is attached.

best,

dylan

RISC-V quick ref card.pdf

Jeff Scheel

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Jul 5, 2022, 10:29:15 AM7/5/22

to Dylan McNamee, RISC-V Developer Board Community

I'm sure I date myself by loving this, but I do! Thanks, Dylan!!!

-Jeff

--

Jeff Scheel (he/him/his)

Linux Foundation, RISC-V Technical Program Manager

Akira Tsukamoto

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Jul 6, 2022, 10:55:04 AM7/6/22

to Jeff Scheel, Dylan McNamee, RISC-V Developer Board Community

I also had one of the card for my z80.
I still keep it :)

Best,
Akira

On 7/5/2022 11:29 PM, Jeff Scheel wrote:
> I'm sure I date myself by loving this, but I do! Thanks, Dylan!!!
> -Jeff
>
> --
> Jeff Scheel (he/him/his)
> Linux Foundation, RISC-V Technical Program Manager
>
>
> On Thu, Jun 30, 2022 at 9:43 PM Dylan McNamee <dylan....@gmail.com <mailto:dylan....@gmail.com>> wrote:
>
> When I was first learning assembly one of my favorite type of learning resources were the tri-fold assembly reference cards, as produced for the PDP-10, Motorola 68K, and other CPUs of the era. I decided to create one for the RISC-V, attached. I used it to convert the Rust inline assembly example from x86 to RISC-V:

> (compile with "rustc rv-asm.rs <http://rv-asm.rs>")
> *use std::arch::asm;

>
> fn main() {
>
> // Multiply x by 6 using shifts and adds
> let mut x: u64 = 4;
> unsafe {
> asm!(
> "addi {tmp}, {x}, 0",
> "slli {tmp}, {tmp}, 1",
> "slli {x}, {x}, 2",
> "add {x}, {tmp}, {x}",
> x = inout(reg) x,
> tmp = out(reg) _,
> );
> }
> assert_eq!(x, 4 * 6);

> }*

>
> A PDF of the reference card is attached.
>
> best,
> dylan
>

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