https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70873
--- Comment #15 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to H.J. Lu from comment #14)
> We need to disable
>
> define_split
> [(set (match_operand 0 "any_fp_register_operand")
> (float_extend (match_operand 1 "memory_operand")))]
> "reload_completed
> && (GET_MODE (operands[0]) == TFmode
> || GET_MODE (operands[0]) == XFmode
> || GET_MODE (operands[0]) == DFmode)"
> [(set (match_dup 0) (match_dup 2))]
> {
>
> for SF->DF.
Why? This splitter will eventually result in a move of 0.0 to a SSE register.
