[Libre-soc-bugs] [Bug 1231] glibc needs dcbt

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=1231

Jacob Lifshay <programmerjake at gmail.com> changed:

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--- Comment #4 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #3)
> commit 1e80810cfac7e2786aa5b81a92f4831dc1031ec0 (HEAD -> 1228-elf-dynamic,
> origin/1228-elf-dynamic)
> Author: Luke Kenneth Casson Leighton <lkcl at lkcl.net>
> Date:   Sun Dec 3 11:32:28 2023 +0000
> 
>     bug 1231: all dc* instructions to be treated as nop
>     
>     https://bugs.libre-soc.org/show_bug.cgi?id=1231#c1

it needs to be just dcbt and dcbtst, since some dc* instructions do have an
effect even in the simulator:

dcbz -- zero block -- basically a really fast way to write zeros to memory.

our half-baked pseudocode for dcbz:
https://git.libre-soc.org/?p=openpower-isa.git;a=blob;f=openpower/isa/sprset.mdwn;hb=1d45949e369d92c0cbd41b2c247a5bae9c37e11b#l310

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