[Bug target/84844] [8 Regression] ICE in extract_constrain_insn_cached, at recog.c:2217 (error: insn does not satisfy its constraints)

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84844

--- Comment #4 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Jakub Jelinek from comment #3)
> Or shall I got for ?*v instead, or ???*v, or !???*v ?

Or we can revert PR78090 fix and use preferred_for_speed attribute again. This
will allow the compiler to emit reg->xmm for cold parts.

BTW: we shouldn't just grep assembly dumps for unoptimal insns, as was done and
reported in PR78090. There is no harm to emit reg->xmm form of the insn in the
cold parts.

Based on this, I prefer the revert of PR78090 patch, perhaps with a run of
462.libquantum to assess the performance impact.