• Clemens Backes's avatar
    Revert "[codegen] Remove redundant xorpd instructions" · 36f159b3
    Clemens Backes authored
    This reverts commit c4cf2ea4.
    
    Reason for revert: Seems to cause more regressions than improvement. Let's see what the perf bots say about the revert.
    
    Original change's description:
    > [codegen] Remove redundant xorpd instructions
    > 
    > It seems like they were originally added in https://crrev.com/23654026
    > (Sep 2013) to break dependences in the OOO pipeline. This code pattern
    > was then later copied for other instructions too
    > (https://crrev.com/1424333002).
    > The reason for the xorpd is not mentioned in the code though, and I
    > found no other compiler doing this. So maybe it's obsolete by now, and
    > only increases code size.
    > 
    > Let's remove them and see if we get any performance regressions.
    > 
    > R=​ahaas@chromium.org
    > CC=​yangguo@chromium.org
    > 
    > Change-Id: I0e6d65afa67f0ee286e5b0ba95c91092c5261c8f
    > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1926427
    > Reviewed-by: Yang Guo <yangguo@chromium.org>
    > Reviewed-by: Andreas Haas <ahaas@chromium.org>
    > Commit-Queue: Clemens Backes <clemensb@chromium.org>
    > Cr-Commit-Position: refs/heads/master@{#65077}
    
    TBR=yangguo@chromium.org,ahaas@chromium.org,clemensb@chromium.org
    
    Bug: chromium:1027876, chromium:1027449
    Change-Id: I533729722e294dbe567222b1c4084df6b864d2ff
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1958053Reviewed-by: 's avatarClemens Backes <clemensb@chromium.org>
    Reviewed-by: 's avatarYang Guo <yangguo@chromium.org>
    Commit-Queue: Clemens Backes <clemensb@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#65388}
    36f159b3
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