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From: "vmakarov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/97532] [11 Regression] Error: insn does not satisfy its
 constraints, internal compiler error: in extract_constrain_insn, at
 recog.c:2196
Date: Thu, 22 Oct 2020 18:48:26 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97532

--- Comment #4 from Vladimir Makarov <vmakarov at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #3)
> The IRA dump says:
>   a2(r189,l0) costs: AREG:2000,2000 DREG:2000,2000 CREG:26000,-1000
> BREG:2000,2000 SIREG:2000,2000 DIREG:2000,2000 AD_REGS:2000,2000
> CLOBBERED_REGS
> :2000,2000 Q_REGS:2000,2000 TLS_GOTBASE_REGS:2000,2000
> GENERAL_REGS:2000,2000 SSE_FIRST_REG:12000,12000 NO_REX_SSE_REGS:12000,12=
000
> SSE_REGS:12000,
> 12000 ALL_SSE_REGS:12000,12000 MMX_REGS:26000,26000 INT_SSE_REGS:26000,26=
000
> ALL_REGS:424000,424000 MEM:12000,12000
> so the INT_SSE_REGS cost of 26000 seems might higher than GENERAL_REGS co=
st.

It does not matter what class IRA gives the address reg. LRA should fix this
anyway.  For usual memory the correct address reg class is checked by
legitimate_address_p hook.

I guess in this case it is a special memory and its constraint does not che=
ck
address reg class at all.  I believe the bug should be fixed on
machine-dependent side of GCC (in constraints and predicates).=