[Bug target/105271] ICE in extract_insn, at recog.cc:2791 (error: unrecognizable insn)

[linkw at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105271

Kewen Lin <linkw at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |linkw at gcc dot gnu.org
             Target|powerpc-e300c3-linux-gnu    |powerpc*-linux-gnu
   Last reconfirmed|                            |2022-04-14
     Ever confirmed|0                           |1
                 CC|                            |linkw at gcc dot gnu.org

--- Comment #1 from Kewen Lin <linkw at gcc dot gnu.org> ---
It can be reproduce even without cross build, and it's related to commit
r12-7925.

Unlike the other vector integer mode, V2DImode on vec_neg
(__builtin_altivec_neg_v2di) is special, it requires the pattern negv2di and
it's further expanded into vzero and subv2di, the latter has the condition
guard "VECTOR_UNIT_P8_VECTOR_P (V2DImode)", so it's wrong to move it out from
P8 vector stanza.  The fix can be to move it back to be under power8-vector
stanza.