On Mon, 2014-12-15 at 12:18 -0800, Josh Stone wrote: > On Fedora 21, this appears to be slightly faster, although pretty close > to noise levels. Mark, can you see if this helps the performance slip > on your el7 system?
It is slightly faster ~0.5 secs on ~55 secs. > /* Unrolling 0 like uleb128 didn't prove to benefit optimization. */ > - for (unsigned int i = 0; i < len_leb128 (acc) && *addrp < end; ++i) > + const size_t max = __libdw_max_len_leb128 (*addrp, end); > + for (size_t i = 0; i < max; ++i) > get_sleb128_step (acc, *addrp, i); > /* Other implementations set VALUE to INT_MAX in this > case. So we better do this as well. */ Unrolling this does seem to give an addition ~0.2 seconds win. So both are mostly in the noise, but they do seem to help a little. But not as much as upgrading GCC :) Cheers, Mark
