[Bug target/96470] [10/11 regression] gnat.dg/opt39.adb is not scalarized

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96470

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P2

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Via

  /* If the user didn't set PARAM_SRA_MAX_SCALARIZATION_SIZE_<...>,
     fall back to a target default.  */
  unsigned HOST_WIDE_INT max_scalarization_size
    = get_move_ratio (optimize_speed_p) * UNITS_PER_WORD;

and rs6000 not altering MOVE_RATIO from its default

/* If a memory-to-memory move would take MOVE_RATIO or more simple
   move-instruction sequences, we will do a cpymem or libcall instead.  */

#ifndef MOVE_RATIO
#if defined (HAVE_cpymemqi) || defined (HAVE_cpymemhi) || defined
(HAVE_cpymemsi) || defined (HAVE_cpymemdi) || defined (HAVE_cpymemti)
#define MOVE_RATIO(speed) 2
#else
/* If we are optimizing for space (-Os), cut down the default move ratio.  */
#define MOVE_RATIO(speed) ((speed) ? 15 : 3)
#endif
#endif

and rs6000 having cpymem.