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From: "jcmvbkbc at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/98470] ICE: "error: insn does not satisfy its
 constraints" with hard FP on xtensa
Date: Tue, 05 Jan 2021 08:13:14 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98470

--- Comment #3 from jcmvbkbc at gcc dot gnu.org ---
(In reply to rsandifo@gcc.gnu.org from comment #2)
> What code should GCC generate if it wants to move the given
> MEM into an FP register?  The two main options are:
>=20
> (1) reload the literal address into a temporary register.
>     This can be done by using "define_memory_constraint"
>     instead of "define_constraint" to define "U".

I've tried that, it doesn't change anything for me. I've also tried doing t=
his
change to the "T" constraint and to both of them. Nothing.

> (2) load into a general-purpose register and then move the
>     general-purpose register to an FP register.  This can
>     be done using the TARGET_SECONDARY_RELOAD hook.

There's already TARGET_SECONDARY_RELOAD hook for xtensa which seems to do
exactly this. But it's not called from the reload and later passes for lite=
ral
loads into FPU registers.=