sorear changed the topic of #riscv to: RISC-V instruction set architecture | https://riscv.org | Logs: https://libera.irclog.whitequark.org/riscv
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<enthusi> Hi, anyone familiar with this? Ubuntu 21 on RISCV Unmatched and for some time now I get this during upgrades:
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<enthusi> Setting up linux-firmware (1.201.3) ...
<enthusi> ...
<enthusi> update-initramfs: Generating /boot/initrd.img-5.13.0-1006-generic
<enthusi> W: Possible missing firmware /lib/firmware/amdgpu/vangogh_gpu_info.bi
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<enthusi> this is VERY slow ...
<enthusi> (I guess the 'generating' part is slow but the warnings worry me)
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<drmpeg> And put it in /lib/firmware/amdgpu
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<enthusi> drmpeg: thanks
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<Teufelchen1> Hi! At a lecture about Matlab, the tutor hinted the existance of MAC(Multiply-Accumulate) instruction. That sparked my curiosity: Does the riscv spec have those as well? I found that the riscv-v spec features "Vector Single-Width Integer Multiply-Add Instructions"; Is that a MAC which statisfies `a = a+b*c`? I'm unsure about that.
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<gordonDrogon> Teufelchen, I've no idea - still newb. to the RV instructions, etc. but this was done on the i860 back in 1990 and (AIUI) adopted into the Pentium MMX instructions - the issue on the i860 was keeping the FP pipeline full, so it executed 2 x 32-bit instructions in parallel, on in the integer unit to fetch the data and the other to do the mul+add in the FP unit...
<Sofia> Teufelchen: If you're using floating points, yes. f[n]m{add,sub} exist.
<Sofia> At least no MAC for rvi, rvv maybe.. checking..
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<Sofia> Neat, it appears that rvv does indeed have this for integers. Section 11.13.
<Sofia> Note the "accumulate" part here implies a read on the destimation register. So rd = "rs3"
<Sofia> or vs3[i] in this case
<Teufelchen> cool! Thanks for confirming.
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<Sofia> ^,^
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<gordonDrogon> It's a small step, but: 000000B0 : 00E78023 : STORE SB FFFF0000 @x15 FFFF0000 + 00000000 := x14, 00000048 -> PUTCHAR: 00000048, H
<gordonDrogon> my little emulator is good enough to run a compiled C program to print Hello, world!
<gordonDrogon> now to take out all the debugging and watch it crash...
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<gordonDrogon> Hello, world
<gordonDrogon> Time taken: 0.274 No. instructions: 344
<gordonDrogon> that's ~1255 instructions per second, so a 1.2Khz clock .. I can live with that for now!
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