• David Chase's avatar
    cmd/compile: added some intrinsics to SSA back end · 8eec2bbf
    David Chase authored
    One intrinsic was needed to help get the very best
    performance out of a future GC; as long as that one was
    being added, I also added Bswap since that is sometimes
    a handy thing to have.  I had intended to fill out the
    bit-scan intrinsic family, but the mismatch between the
    "scan forward" instruction and "count leading zeroes"
    was large enough to cause me to leave it out -- it poses
    a dilemma that I'd rather dodge right now.
    
    These intrinsics are not exposed for general use.
    That's a separate issue requiring an API proposal change
    ( https://github.com/golang/proposal )
    
    All intrinsics are tested, both that they are substituted
    on the appropriate architecture, and that they produce the
    expected result.
    
    Change-Id: I5848037cfd97de4f75bdc33bdd89bba00af4a8ee
    Reviewed-on: https://go-review.googlesource.com/20564Reviewed-by: 's avatarKeith Randall <khr@golang.org>
    Run-TryBot: David Chase <drchase@google.com>
    TryBot-Result: Gobot Gobot <gobot@golang.org>
    8eec2bbf
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