1. 09 Jul, 2020 1 commit
    • Clemens Backes's avatar
      [liftoff] Handle unordered register pairs · b429b8f9
      Clemens Backes authored
      For 64-bit binary operations, Liftoff on arm made the assumption that
      register pairs are always ordered, i.e. the register code for the low
      word is lower than the register code for the high word.
      Ensuring this was only implemented in {GetUnusedRegister} in
      https://crrev.com/c/2168875. Other cases were missing though, e.g.
      return values, but also different places were we
      construct register pairs internally.
      
      Thus, this CL removes this constraint again and instead handles
      unordered register pairs in 64-bit binary operations on arm.
      
      R=thibaudm@chromium.org
      
      Bug: chromium:1101304
      Change-Id: I4cd9fb1577f82ab06d34c9dde6533cf04a2cade7
      Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2287870Reviewed-by: 's avatarThibaud Michaud <thibaudm@chromium.org>
      Commit-Queue: Clemens Backes <clemensb@chromium.org>
      Cr-Commit-Position: refs/heads/master@{#68752}
      b429b8f9