malcolm.parsons added inline comments.
================
Comment at: include/clang/AST/TypeLoc.h:513
struct BuiltinLocInfo {
- SourceLocation BuiltinLoc;
+ SourceRange BuiltinRange;
};
----------------
aaron.ballman wrote:
> malcolm.parsons wrote:
> > aaron.ballman wrote:
> > > malcolm.parsons wrote:
> > > > aaron.ballman wrote:
> > > > > malcolm.parsons wrote:
> > > > > > aaron.ballman wrote:
> > > > > > > Since this doubles the size of the type loc for builtin types, do
> > > > > > > you happen to have any data on what practical impact this has on
> > > > > > > RAM usage, say for bootstrapping LLVM (or compiling any large
> > > > > > > source base, really)? Hopefully it's not a lot, but it would be
> > > > > > > nice to know if it's a .1%, 1%, 10%, etc increase in usage (or
> > > > > > > does the change get lost in the noise).
> > > > > > I don't have any data.
> > > > > > I'm not sure how to collect that data.
> > > > > It's likely platform dependent, but I was thinking something as
> > > > > simple as looking at peak RAM usage between two different builds of
> > > > > the compiler. Something like `top` would probably work if you're on
> > > > > Linux (unless someone knows of a better way, I'm not strong on Linux).
> > > > Before:
> > > > /usr/bin/time clang++ ... -c llvm/tools/clang/lib/AST/ExprConstant.cpp
> > > > 5.56user 0.13system 0:05.91elapsed 96%CPU (0avgtext+0avgdata
> > > > 256820maxresident)k
> > > >
> > > > After:
> > > > /usr/bin/time clang++ ... -c llvm/tools/clang/lib/AST/ExprConstant.cpp
> > > > 5.67user 0.12system 0:05.98elapsed 97%CPU (0avgtext+0avgdata
> > > > 256940maxresident)k
> > > >
> > > > ((256940 - 256820) / 256820) * 100 = 0.05%
> > > Thank you for this -- is there a bigger delta for compilation of LLVM as
> > > a whole? ExprConstant.cpp is an interesting case, but not really
> > > representative of the project as a whole (for instance, there's not a lot
> > > of template metaprogramming in ExprConstant.cpp).
> > I can try running time on a full build.
> > For every file I sampled the increase was 0.05%.
> > Do TypeLocs increase when using TMP?
> I *think* that template arguments use TypeLocs, but I could be remembering
> incorrectly (and I unfortunately won't have the chance to check until next
> week sometime). I was asking for the whole project just in case there is some
> construct that has a heavier use of them. Your findings of .05% are really
> promising though.
Time reports max resident for building lib dir of llvm as 480780 before, 480920
after.
0.03%
https://reviews.llvm.org/D25363
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