• Kanghua Yu's avatar
    [x64] Use XOR instruction to zero register in SpeculationPoison · a4b615eb
    Kanghua Yu authored
    kind = BYTECODE_HANDLER
    name = Wide
    compiler = turbofan
    Body (size = 64)
    Instructions (size = 56)
                      -- Prologue: generate speculation poison --
    0x3f54d38b5c0     0  488d1df9ffffff REX.W leaq rbx,[rip+0xfffffff9]
    0x3f54d38b5c7     7  49c7c100000000 REX.W movq r9,0x0
    
    =>
    ...
    Body (size = 60)
    Instructions (size = 52)
                      -- Prologue: generate speculation poison --
    0x3f54d38b5c0     0  488d1df9ffffff REX.W leaq rbx,[rip+0xfffffff9]
    0x3f54d38b5c7     7  4533c9         xorl r9,r9
    
    Change-Id: I2e3926a01423a979fd77cfc0c0081f049bb01eb8
    Reviewed-on: https://chromium-review.googlesource.com/940778Reviewed-by: 's avatarRoss McIlroy <rmcilroy@chromium.org>
    Commit-Queue: Kanghua Yu <kanghua.yu@intel.com>
    Cr-Commit-Position: refs/heads/master@{#51641}
    a4b615eb
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