• Ng Zhi An's avatar
    [wasm-simd][liftoff] Push/pop SIMD registers · b76d561e
    Ng Zhi An authored
    On most architectures, FP registers overlap with SIMD registers. A FP
    register holding a double can later be used to hold a 128-bit SIMD
    value. So, when pushing or popping used registers, we need to push the
    full width of the SIMD register.
    
    In ia32 and x64, we change the
    instruction from movsd to movdqu, and increment the offset by
    kSimd128Size.
    
    For arm64, we change the size of register when building
    the CPURegList.
    
    For arm, no change is needed, due to the way FP registers are paired up
    to form a single SIMD register (rather than overlap).
    
    Note for ports: PushRegisters and PopRegisters needs to be modified
    similarly for mips/mips64. ppc and s390 does not implement these
    methods, no change needed.
    
    Bug: v8:9909
    Change-Id: If29f1b30d7eface305a0d07a4bc551c151a77a01
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1994383
    Commit-Queue: Zhi An Ng <zhin@chromium.org>
    Reviewed-by: 's avatarClemens Backes <clemensb@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#65710}
    b76d561e
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