[Bug rtl-optimization/97170] Wrong optimization in fwprop pass

[rjiejie at me dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97170

--- Comment #2 from jojo <rjiejie at me dot com> ---
(In reply to Andrew Pinski from comment #1)
> target_fcvt is wrong.
> try:
> (define_insn "target_fcvt"
>   [(set (match_operand:SI 0 "register_operand" "=r")
>         (unspec:SI [(match_operand:SF 1 "register_operand" "f")
>                     (reg:SI FCVTMODE_REGNUM)]
>         UNSPEC_FCVT))]
>   ""
>   "fcvt\t%0,%1"
> )
> 
> instead.  Basically the set is not dependent on the reg (FCVTMODE_REGNUM)
> only the instruction itself which is what ever.

It works, Thanks so much :)