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From: "vmakarov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/64688] [5 Regression] internal compiler error: Max. number of generated reload insns per insn is achieved (90)
Date: Wed, 21 Jan 2015 20:52:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64688

--- Comment #3 from Vladimir Makarov <vmakarov at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #2)
> This is while reloading
> (define_insn "vec_set<mode>_0"
>   [(set (match_operand:VI4F_128 0 "nonimmediate_operand"
>           "=Yr,*v,v,v ,x,x,v,Yr ,*x ,x  ,m ,m   ,m")
>         (vec_merge:VI4F_128
>           (vec_duplicate:VI4F_128
>             (match_operand:<ssescalarmode> 2 "general_operand"
>           " Yr,*v,m,*r,m,x,v,*rm,*rm,*rm,!x,!*re,!*fF"))
>           (match_operand:VI4F_128 1 "vector_move_operand"
>           " C , C,C,C ,C,0,v,0  ,0  ,x  ,0 ,0   ,0")
>           (const_int 1)))]
> instruction I think.

The problem is related to

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64477

The solution proposed there solves this problem too.  Changing '*r' to 'r"
resulting in constraint

" Yr,*v,m,r,m,x,v,*rm,*rm,*rm,!x,!*re,!*fF"

will solve the PR.  So the change will solve 2 PRs (this one and 64477).

I believe it is up to x86 maintainers to do this change.