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c++: optimize specialization of templated member functions

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This applies one of the lookup_template_class optimizations from the
previous patch to instantiate_template as well.

gcc/cp/ChangeLog:

	* pt.cc (instantiate_template): Don't substitute the context
	of the most general template if that of the partially
	instantiated template is already non-dependent.
This commit is contained in:
Patrick Palka 2022-06-10 16:09:58 -04:00
parent cb7fd1ea85
commit f9b5a8e58d
1 changed files with 8 additions and 2 deletions
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10
gcc/cp/pt.cc
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@ -21714,8 +21714,14 @@ instantiate_template (tree tmpl, tree orig_args, tsubst_flags_t complain)
++processing_template_decl;
if (DECL_CLASS_SCOPE_P (gen_tmpl))
{
tree ctx = tsubst_aggr_type (DECL_CONTEXT (gen_tmpl), targ_ptr,
complain, gen_tmpl, true);
tree ctx;
if (!uses_template_parms (DECL_CONTEXT (tmpl)))
/* If the context of the partially instantiated template is
already non-dependent, then we might as well use it. */
ctx = DECL_CONTEXT (tmpl);
else
ctx = tsubst_aggr_type (DECL_CONTEXT (gen_tmpl), targ_ptr,
complain, gen_tmpl, true);
push_nested_class (ctx);
}