std::pow implementation

[Richard Guenther]

On Wed, 30 Jul 2003, Joe Buck wrote:

> However, that doesn't get around the fact that we have an -O3 switch,
> enabling a mode where the compiler has to make decisions to inline
> additional functions.
>
> In such cases, the compiler cannot ignore the effect of constant arguments
> causing much of the code in a called function to disappear when the called
> function is inlined.

We may be able to do this now with unit-at-a-time and callgraph by
duplicating the trees for function calls with constant arguments and
binding the constant arguments and doing the tree-optimizations on these
bodies before deciding inlining (and we may even just emit this new
function out of line if not inlined).

Richard.