• Michael Stanton's avatar
    Revert "[turbofan] Masking/poisoning in codegen (optimized code, mips & mips64)" · 11831378
    Michael Stanton authored
    This reverts commit 46a3c772.
    
    Reason for revert: This is actually not quite ready. What we need is a speculation free poisoning, and if we do another branch, then I think that won't happen.
    
    Original change's description:
    > [turbofan] Masking/poisoning in codegen (optimized code, mips & mips64)
    > 
    > This introduces masking of loads with speculation bit during code generation.
    > At the moment, this is done only under the
    > --branch-load-poisoning flag, and this CL enlarges the set of supported
    > platforms from {x64, arm, arm64} to {x64, arm, arm64, mips, mips64}.
    > 
    > Overview of changes:
    > - new register configuration configuration with one register reserved for
    >   the speculation poison/mask (kSpeculationPoisonRegister).
    > - in codegen, we introduce an update to the poison register at the starts
    >   of all successors of branches (and deopts) that are marked as safety
    >   branches (deopts).
    > - in memory optimizer, we lower all field and element loads to PoisonedLoads.
    > - poisoned loads are then masked in codegen with the poison register.
    >   * only integer loads are masked at the moment.
    > 
    > Bug: chromium:798964
    > Change-Id: I211395b8305ed0ad9288d6da48fa159fa970c827
    > Reviewed-on: https://chromium-review.googlesource.com/951382
    > Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
    > Reviewed-by: Ivica Bogosavljevic <ivica.bogosavljevic@mips.com>
    > Commit-Queue: Ivica Bogosavljevic <ivica.bogosavljevic@mips.com>
    > Cr-Commit-Position: refs/heads/master@{#52042}
    
    TBR=mvstanton@chromium.org,mstarzinger@chromium.org,ivica.bogosavljevic@mips.com
    
    Change-Id: Ief4d9ef56d918172f0b545d321a64b1ab5b46915
    No-Presubmit: true
    No-Tree-Checks: true
    No-Try: true
    Bug: chromium:798964
    Reviewed-on: https://chromium-review.googlesource.com/969041Reviewed-by: 's avatarMichael Stanton <mvstanton@chromium.org>
    Commit-Queue: Michael Stanton <mvstanton@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#52045}
    11831378
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