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

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Sun Apr 19 10:57:00 BST 2020


--- Comment #21 from Luke Kenneth Casson Leighton <lkcl at 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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