[PATCH] Teach builtin clz, ctz, and popcount to be const

[Justin Bogner]

Joerg Sonnenberg wrote:
> On Tue, Jun 11, 2013 at 12:18:55AM -0600, Justin Bogner wrote:
>> The clz, ctz, and popcount builtins are trivial to add constant folded
>> implementations of, and gcc accepts them in const contexts.
> 
> Can you test the constant folding with
> char foo[f(x) == val ? 1 : -1];
> 
> or so?

Do you mean something like this?

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