• 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
liftoff-assembler.h 60.7 KB