[Libre-soc-dev] LD/ST Elwidth Overrides

Jacob Lifshay programmerjake at gmail.com
Wed Sep 1 18:22:48 BST 2021

On Wed, Sep 1, 2021, 07:52 lkcl <luke.leighton at gmail.com> wrote:

> * operation width ld=64 lw=32 lh=16 lb=8
> * src elwidth override applies to memory, dflt/32/16/8
> * dest elwidth override applies to the register
>    receiving the data being read.

I realized that it would be more useful to let the src elwidth override
apply to the index register for lbzx (and all ld/st indexed instructions)
instead of using the src elwidth to change the memory access size, which is

Note that how I'm proposing is exactly how gather/scatter works on x86 and
Arm and probably waay more...it's also useful for doing webassembly
load/stores in one instruction, rather than 3 (explained in irclog link).



More information about the Libre-soc-dev mailing list