[Bug middle-end/68291] [6 regression] ICE in emit_move_insn, at expr.c:3540

[aoliva at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68291

--- Comment #7 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Eric, apologies for the slow response, I'm in the middle of an all-week trip
with little Internet access.

I think the best course of action is to adjust gimple_can_coalesce_p so that it
returns false for RESULT_DECLs for which promote_ssa_mode returns BLKmode, and
then adjust the block you quoted to assign a group rtx to the result decl, like
the original code (still present a few lines below) used to do when
hard_function_value returned a non-REG.  I don't think we can allow coalescing
in this case, because IIRC expanders can't deal with these parallels in
general.

I can look into this next week, when I'll be back home, if you prefer.  Just
let me know.