[Bug target/95740] Failure to avoid using the stack when interpreting a float as an integer when it is modified afterwards

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95740

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2020-06-18
           Keywords|                            |ra

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
;; return _1;

(insn 6 5 7 (parallel [
            (set (reg:SI 86)
                (plus:SI (subreg:SI (reg/v:SF 85 [ p ]) 0)
                    (const_int 1 [0x1])))
            (clobber (reg:CC 17 flags))
        ]) "t.c":5:5 -1
     (nil))

(insn 7 6 8 (set (reg:SI 84 [ <retval> ])
        (reg:SI 86)) "t.c":6:12 -1
     (nil))


Initial RTL couldn't be better...  but then LRA chooses to spill rather
than try a direct xmm->grp move.  -mtune=intel didn't help here (for
generic we IIRC avoid such moves)