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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/102943] [12 Regression] Jump threader
 compile-time hog with 521.wrf_r
Date: Thu, 10 Mar 2022 14:23:10 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102943

--- Comment #43 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Andrew Macleod from comment #42)
> (In reply to Richard Biener from comment #37)
> > I'm looking at range_def_chain::m_def_chain, it's use is well obfuscate=
d by
> > inheritance but comments suggest that we have one such structure either=
 for
> > each edge in the CFG or for each basic-block.  In particular this
>=20
> There is one structure per ssa-name globally.
[...]=20
> so its just O(ssa-name) already.

so you mean O(num-ssa-names^2) since if it exists for each SSA name then
we have m_def_chain (of length num-ssa-names) for each SSA name?  That's
what I originally feared, but I failed to find the array(?) that stores
the range_def_chains.=