On 07/25/16 08:46, Richard Biener wrote:
There is also the question about optimization - we go great lengths to ensure
that for example loop store motion applies to counter updates so we get
old_ctr = values[42];
for (;;)
...
values[42] = old_ctr + # iterations
using atomics there might show that we have no facility to optimize atomics
at all (given their usual semantics is to include some kind of barrier).
Hm, that suggests something along the lines of __builtin_gcov_add() and an
associated optimization ...
nathan
