[libre-riscv-dev] [Bug 216] LOAD STORE buffer needed

[bugzilla-daemon@libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=216

--- Comment #21 from Luke Kenneth Casson Leighton <lkcl@lkcl.net> ---
(In reply to Jacob Lifshay from comment #19)
> (In reply to Luke Kenneth Casson Leighton from comment #18)

> > ok so those 1 MB texture buffers you mentioned before are accessed multiple
> > times in near-succession?
> 
> Yes. Though several different textures can be accessed in an interleaved
> fashion.

ok that's fine.

so what will happen, because the addr match is on the last 4k (11 bits),
anything that has on the same 4k LSBs even though the MSBs do not match, gets
delayed a couple of cycles and, after the false positive clears through the
memory system, the "not-actually-conflicting" LDST's turn will come next.

Mitch's analysis showed that in practice this is such a rare occurrence that
the penalty is not worth being concerned about.

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