On Tue, Mar 6, 2012 at 3:37 PM, Daniel Dunbar <[email protected]> wrote:
> Hi Richard, > > I've been looking into compile time performance, and I'm worried about > this code. > > It looks like it is doing a lot of work for non-C++ code, and I see a > pretty big compile time speedup (2%, which is pretty big for one > thing) from disabling this code. > r152181 should make things a little better here, and r152193 should help a lot (I'm seeing nearly a 3% speedup from that change for clang -Wno-conversion -O0 combine.c -c -o /dev/null). We still have some time wasted evaluating AST nodes for disabled diagnostics, but checking whether a diagnostic is enabled is currently too slow for there to be a trivial fix here.
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