11706 vs ([lno] Canonical iv creation)

[Paolo Carlini]

Hi again,

finally, I have been able to actually test the the new pass on the code
we care about. The current assembler, is simply *astonishing*.
E.g.:

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

Paolo.