On Wed, Apr 8, 2015 at 11:42 AM, Chandler Carruth <[email protected]> wrote:
> Before we go here, I think we should seriously ask whether we want to undo > that restriction on shift left. > > I can see arguments both for and against it. > > Does GCC already do this optimization? I've not found any evidence that GCC optimizes on the assumption that the LHS of a signed left shift is not negative.
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