Re: [PATCH] Add plugin bbvgen: basic block icounts for topblocks + simpoints

[Alex Bennée]

Greg McGary <gkm@rivosinc.com> writes:

> Tally icounts for basic blocks. The data is useful for producing
> human-readable topblocks reports, and for creating simpoints to guide
> accurate & efficient machine simulation runs.
>
> QEMU's The Tiny Code Generator creates TCG blocks in a way that is
> expedient for JIT translation but does not conform to the model of CFG
> basic blocks. TCG greedily translates straight-line code until it must
> end the block for one of four reasons: (1) page boundary, or (2)
> maximum TCG block length, or (3) CSR-hacking insn, or (4) jump/branch
> insn. A single TCG block can span multiple CFG blocks when there are
> internal branch targets. Multiple TCG blocks can constitute a single
> CFG block when the component TCG blocks terminate at page boundary,
> max block length, or CSR-hacking insn.
>
> The bbvgen plugin normalizes TCG blocks into CFG blocks.

Are there any tools that consume this data?

<snip>

-- 
Alex Bennée
Virtualisation Tech Lead @ Linaro