21–30 of 32 posts
Earlier quoted context omitted.
B extension was ratified in 2021, near the end. It is considerably newer than every extension this emulator implements, and thus reasonable it'd have these and not B.
Hopefully B becomes ubiquitous in the next generation of SoC's, or RISC-V is going to look bad in any benchmarks that happen to have a popcnt in the hot path.
edit: Zbs.
Earlier quoted context omitted.
Hopefully B becomes ubiquitous in the next generation of SoC's, or RISC-V is going to look bad in any benchmarks that happen to have a popcnt in the hot path.
At least Zba, Zbb and Zbs are in RVA22 iirc. edit: Zbs.
That's good to see. (Boy, it's really hard to find info about RISC-V profiles on Google. It just seems to ignore all the letters and numbers.)
Earlier quoted context omitted.
B extension was ratified in 2021, near the end. It is considerably newer than every extension this emulator implements, and thus reasonable it'd have these and not B.
Hopefully B becomes ubiquitous in the next generation of SoC's, or RISC-V is going to look bad in any benchmarks that happen to have a popcnt in the hot path.
Earlier quoted context omitted.
Hopefully B becomes ubiquitous in the next generation of SoC's, or RISC-V is going to look bad in any benchmarks that happen to have a popcnt in the hot path.
At least Zba, Zbb and Zbs are in RVA22 iirc. edit: Zbs.
Earlier quoted context omitted.
B extension was ratified in 2021, near the end. It is considerably newer than every extension this emulator implements, and thus reasonable it'd have these and not B.
Hopefully B becomes ubiquitous in the next generation of SoC's, or RISC-V is going to look bad in any benchmarks that happen to have a popcnt in the hot path.
Hopefully together with V.
Earlier quoted context omitted.
The soon to be released VisionFive 2 board seems like a good match https://www.starfivetech.com/en/site/boards
That's significantly more overkill than the D1.
I could not confirm if the k210 has a usb controller (not the UARTUSB dongle).
Earlier quoted context omitted.
Hopefully B becomes ubiquitous in the next generation of SoC's, or RISC-V is going to look bad in any benchmarks that happen to have a popcnt in the hot path.
I worry a bit that B is too ambitious with many instructions that no one is using yet which are difficult to prove their value as a result, while regular RISC-V is essentially hobbled compared to ordinary cpus due to the absence of popcnt/clz.
Even the newer revisions of cores that have been available for a while (like SiFive U74) have been updated with B support.
As such, I believe it to be a non-issue. Hardware simply takes time.
>which are difficult to prove their value as a result,
As with any RISC-V extensions, each instruction had to meet many criteria to be allowed in there.
Rationale accompany the instructions in the documentation.
Earlier quoted context omitted.
That's significantly more overkill than the D1.
The D1 based miniboards seem to be the currently only alternative for what I would like to do. Only the mango pi board I guess, or any others? I could not confirm if the k210 has a usb controller (not the UART USB dongle).
Lichee RV (with a breakout dock board) is the one I have.
https://bellard.org/tinyemu/readme.txt : > 4.1) 128 bit support > The RISC-V specification does not define all the instruction encodings for the 128 bit integer and floating point operations. The missing ones were interpolated from the 32 and 64 ones. > Unfortunately there is no RISC-V 128 bit toolchain nor OS now (volunteers for the Linux port ?), so rv128test.bin may be the first 128 bit code for RISC-V !
Although with my pedant hat on: that's extrapolation, not interpolation. That's because 128 is outside of the existing range.