[PATCH 0/7] Set/get accessor speedups

[David Sterba <dsterba@suse.com>]

Followup to [1] bringing refactoring that allows compiler to do more
optimizations and stack usage reduction. As the set/get helpers are
heavily used in many functions this improves performance. I will provide
some numbers later as I've done mostly functional tests. During the
development I've identified a few more possible optimizations to improve
performance, but this series is OK as is.

Overall effects of this series:

Stack:

  btrfs_set_16                                          -72 (88 -> 16)
  btrfs_get_32                                          -56 (80 -> 24)
  btrfs_set_8                                           -72 (88 -> 16)
  btrfs_set_64                                          -64 (88 -> 24)
  btrfs_get_8                                           -72 (80 -> 8)
  btrfs_get_16                                          -64 (80 -> 16)
  btrfs_set_32                                          -64 (88 -> 24)
  btrfs_get_64                                          -56 (80 -> 24)

  NEW (48):
	  report_setget_bounds                           48
  LOST/NEW DELTA:      +48
  PRE/POST DELTA:     -472

Code:

     text    data     bss     dec     hex filename
  1456601  115665   16088 1588354  183c82 pre/btrfs.ko
  1454229  115665   16088 1585982  18333e post/btrfs.ko

  DELTA: -2372

[1] https://lore.kernel.org/linux-btrfs/cover.1751032655.git.dsterba@suse.com/

David Sterba (7):
  btrfs: accessors: simplify folio bounds checks
  btrfs: accessors: use type sizeof constants directly
  btrfs: accessors: inline eb bounds check and factor out the error
    report
  btrfs: accessors: compile-time fast path for u8
  btrfs: accessors: compile-time fast path for u16
  btrfs: accessors: set target address at initialization
  btrfs: accessors: factor out split memcpy with two sources

 fs/btrfs/accessors.c | 84 +++++++++++++++++++++++++++-----------------
 1 file changed, 51 insertions(+), 33 deletions(-)

-- 
2.49.0