-PERL_CALLCONV IV Perl_sv_2iv(pTHX_ register SV *sv);
-PERL_CALLCONV UV Perl_sv_2uv(pTHX_ register SV *sv);
-PERL_CALLCONV NV Perl_sv_2nv(pTHX_ register SV *sv);
-PERL_CALLCONV char * Perl_sv_2pv(pTHX_ register SV *sv, STRLEN *lp);
-PERL_CALLCONV char * Perl_sv_2pv_nolen(pTHX_ register SV *sv);
-PERL_CALLCONV char * Perl_sv_2pvbyte_nolen(pTHX_ register SV *sv);
-PERL_CALLCONV char * Perl_sv_2pvutf8_nolen(pTHX_ register SV *sv);
-PERL_CALLCONV void Perl_sv_force_normal(pTHX_ register SV *sv);
-PERL_CALLCONV void Perl_sv_setsv(pTHX_ SV *dstr, register SV *sstr);
+PERL_CALLCONV IV Perl_sv_2iv(pTHX_ SV *sv);
+PERL_CALLCONV UV Perl_sv_2uv(pTHX_ SV *sv);
+PERL_CALLCONV NV Perl_sv_2nv(pTHX_ SV *sv);
+PERL_CALLCONV char * Perl_sv_2pv(pTHX_ SV *sv, STRLEN *lp);
+PERL_CALLCONV char * Perl_sv_2pv_nolen(pTHX_ SV *sv);
+PERL_CALLCONV char * Perl_sv_2pvbyte_nolen(pTHX_ SV *sv);
+PERL_CALLCONV char * Perl_sv_2pvutf8_nolen(pTHX_ SV *sv);
+PERL_CALLCONV void Perl_sv_force_normal(pTHX_ SV *sv);
+PERL_CALLCONV void Perl_sv_setsv(pTHX_ SV *dstr, SV *sstr);