[cfe-dev] compilation time 3.5 vs 3.6

[mobi phil]

Hi,

I compared compilation time with clang version 3.5 that ships with latest
ubuntu and the one I built (with --enable-optimized   --enable-shared). The
results are:

3.5 from ubuntu: 2,60s user 0,14s system 99% cpu *2,766* total
3.6 (a33591f612fa56e7c83fe348e7ca6c32778aacb0): 3,92s user 0,14s system 99%
cpu *4,078* total

Did run the same compilation few times with the same compiler to avoid some
cold caches.

This means almost 50%. Any reason for this? Any other build hints for more
aggressive optimizations?

rgrds,
mobi phil
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