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| author | Jason Merrill <jason@redhat.com> | 2021-06-09 17:48:14 -0400 |
|---|---|---|
| committer | Jason Merrill <jason@redhat.com> | 2021-06-12 00:58:11 -0400 |
| commit | c4e50e500da7692aad53a4488aff32e056149b3c (patch) | |
| tree | 1893d70592702b1fa233133ec164bee1d8e1673d /gcc | |
| parent | f16f65f8364b5bf23c72a8fdbba4974ecadc5cb6 (diff) | |
| download | gcc-c4e50e500da7692aad53a4488aff32e056149b3c.zip gcc-c4e50e500da7692aad53a4488aff32e056149b3c.tar.gz gcc-c4e50e500da7692aad53a4488aff32e056149b3c.tar.bz2 | |
c++: speed up looking up the current class
While looking at template instantiation tracing, I noticed that we were
frequently looking up a particular class template instance while
instantiating it. This patch shortcuts that lookup, and speeds up compiling
stdc++.h with my (checking/unoptimized) compiler by about 3%.
gcc/cp/ChangeLog:
* pt.c (lookup_template_class_1): Shortcut current_class_type.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/cp/pt.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c index 141388a..d4bb5cc 100644 --- a/gcc/cp/pt.c +++ b/gcc/cp/pt.c @@ -9833,6 +9833,13 @@ lookup_template_class_1 (tree d1, tree arglist, tree in_decl, tree context, /* From here on, we're only interested in the most general template. */ + /* Shortcut looking up the current class scope again. */ + if (current_class_type) + if (tree ti = CLASSTYPE_TEMPLATE_INFO (current_class_type)) + if (gen_tmpl == most_general_template (TI_TEMPLATE (ti)) + && comp_template_args (arglist, TI_ARGS (ti))) + return current_class_type; + /* Calculate the BOUND_ARGS. These will be the args that are actually tsubst'd into the definition to create the instantiation. */ |