Hi, On Tue, 22 Sep 2015, David Malcolm wrote:
> The drawback is that it could bloat the ad-hoc table. Can the ad-hoc > table ever get smaller, or does it only ever get inserted into? It only ever grows. > An idea I had is that we could stash short ranges directly into the 32 > bits of location_t, by offsetting the per-column-bits somewhat. It's certainly worth an experiment: let's say you restrict yourself to tokens less than 8 characters, you need an additional 3 bits (using one value, e.g. zero, as the escape value). That leaves 20 bits for the line numbers (for the normal 8 bit columns), which might be enough for most single-file compilations. For LTO compilation this often won't be enough. > My plan is to investigate the impact these patches have on the time and > memory consumption of the compiler, When you do so, make sure you're also measuring an LTO compilation with debug info of something big (firefox). I know that we already had issues with the size of the linemap data in the past for these cases (probably when we added columns). Ciao, Michael.
