https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64500
ak at gcc dot gnu.org changed:
What |Removed |Added
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CC| |ak at gcc dot gnu.org
--- Comment #4 from ak at gcc dot gnu.org ---
I see the same when building things like LLVM with a modern gcc.
push_to_top_level consistently uses 5-6% of the CPU time and is by far the most
expensive function of the compiler.
The hot comparison is the global_scope_p check below.
Need a better data structure?
/* Have to include the global scope, because class-scope decls
aren't listed anywhere useful. */
for (; b; b = b->level_chain)
{
tree t;
/* Template IDs are inserted into the global level. If they were
inserted into namespace level, finish_file wouldn't find them
when doing pending instantiations. Therefore, don't stop at
namespace level, but continue until :: . */
if (global_scope_p (b))
break;
