• Clemens Hammacher's avatar
    Allow constexpr RegList construction from Registers · fd306a06
    Clemens Hammacher authored
    Before, the standard way to create a RegList was either:
    RegList list = (1 << 0) | (1 << 1) | ...
    or
    RegList list = rax.bit() | rdx.bit() | ...
    
    The first way allows to make the RegList constexpr, but needs comments
    to document which registers you are referring to, and it has no checks
    that all bits you set on the RegList actually belong to valid registers.
    The second one uses the symbolic names, hence is much more readable and
    makes it harder to construct invalid RegLists. It's not constexpr
    though, since the {bit()} method on the register types is not constexpr.
    
    This CL adds a constexpr accessor to get the code and bit of a
    constexpr Register, and adds a helper method to create a constexpr
    RegList like this:
    constexpr RegList list = Register::ListOf<rax, rdx, rdi>();
    
    This new method is used in a number of places to test its
    applicability. Other uses of the old pattern remain and can be cleaned
    up later.
    
    R=tebbi@chromium.org
    
    Change-Id: Ie7b1d6342dc5f316dcfedd0363b3540ad5e7f413
    Reviewed-on: https://chromium-review.googlesource.com/728026
    Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
    Reviewed-by: 's avatarTobias Tebbi <tebbi@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#48887}
    fd306a06
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