11706 vs ([lno] Canonical iv creation)

[B. Kosnik]

>double f(double a)
>{
>  return std::pow(a, 4);
>}
>
>On x86, -O2 -fomit-frame-pointer -ftree-loop-optimize -fscalar-evolutions
>-funroll-loops:
>
>00000000 <f(double)>:
>   0:   dd 44 24 04             fldl   0x4(%esp)
>   4:   d8 c8                   fmul   %st(0),%st
>   6:   d8 c8                   fmul   %st(0),%st
>   8:   c3                      ret

This is really great news y'all. Thanks for this.

Between this, -funit-at-a-time,  and the tree-ssa bits to fold
std::complex, I'd say things are really looking up for highly optimized,
freely compiled C++ code.

Has anybody looked at what these tricks do to codegen for std::iterator
or std::string::iterator?

-benjamin