precalc invokebuiltin destinations

Noticed that struct rb_builtin_function is a purely compile-time
constant.  MJIT can eliminate some runtime calculations by statically
generate dedicated C code generator for each builtin functions.

3 files changed, 28 insertions, 5 deletions

diff --git a/tool/ruby_vm/views/_mjit_compile_insn_body.erb b/tool/ruby_vm/views/_mjit_compile_insn_body.erb
index bc77b02b71..eb0f8485c3 100644
--- a/tool/ruby_vm/views/_mjit_compile_insn_body.erb
+++ b/tool/ruby_vm/views/_mjit_compile_insn_body.erb
@@ -63,6 +63,10 @@
             fprintf(f, "        goto label_%lu;\n", arg.base_pos + else_offset);
             fprintf(f, "    }\n");
         }
+%     elsif insn.name == 'invokebuiltin' || insn.name == 'opt_invokebuiltin_delegate'
+        {
+<%=   render 'mjit_compile_invokebuiltin', locals: { insn: insn } -%>
+        }
 %     else
 %       # Before we `goto` next insn, we need to set return values, especially for getinlinecache
 %       insn.rets.reverse_each.with_index do |ret, i|
diff --git a/tool/ruby_vm/views/_mjit_compile_invokebuiltin.erb b/tool/ruby_vm/views/_mjit_compile_invokebuiltin.erb
new file mode 100644
index 0000000000..f935f799cb
--- /dev/null
+++ b/tool/ruby_vm/views/_mjit_compile_invokebuiltin.erb
@@ -0,0 +1,23 @@
+% # -*- C -*-
+% # Copyright (c) 2020 Urabe, Shyouhei.  All rights reserved.
+% #
+% # This file is a part of  the programming language Ruby.  Permission is hereby
+% # granted, to either  redistribute and/or modify this file,  provided that the
+% # conditions mentioned  in the  file COPYING  are met.   Consult the  file for
+% # details.
+%
+    /* <%= insn.name %> */
+    const struct rb_builtin_function *bf = (const void *)operands[0];
+%
+% if insn.name == 'invokebuiltin' then
+    const rb_num_t index = -1;
+% else
+    const rb_num_t index = (rb_num_t)operands[1];
+% end
+%
+    if (bf->compiler) {
+        bf->compiler(f, index);
+    }
+    else {
+        mjit_invokebuiltin_default_compiler(f, bf, index);
+    }
diff --git a/tool/ruby_vm/views/mjit_compile.inc.erb b/tool/ruby_vm/views/mjit_compile.inc.erb
index c8f9aca777..e3be549181 100644
--- a/tool/ruby_vm/views/mjit_compile.inc.erb
+++ b/tool/ruby_vm/views/mjit_compile.inc.erb
@@ -67,13 +67,9 @@ switch (insn) {
     {
 %     # opt_invokebuiltin_delegate_leave also implements leave insn. We need to handle it here for inlining.
 %     if insn.name == 'opt_invokebuiltin_delegate_leave'
-      RB_BUILTIN bf = (RB_BUILTIN)operands[0];
-      rb_num_t index = (rb_num_t)operands[0];
       fprintf(f, "{\n");
       fprintf(f, "    VALUE val;\n");
-      fprintf(f, "    RB_BUILTIN bf = (RB_BUILTIN)0x%"PRIxVALUE";\n", operands[0]);
-      fprintf(f, "    rb_num_t index = (rb_num_t)0x%"PRIxVALUE";\n", operands[1]);
-      fprintf(f, <%= rstring2cstr(insn.expr.expr.lines.find { |l| l =~ / vm_invoke_builtin_delegate\(/ }).gsub("\n", '\n') %>);
+<%=   render 'mjit_compile_invokebuiltin', locals: { insn: insn } -%>
       fprintf(f, "    stack[0] = val;\n");
       fprintf(f, "}\n");
 %     else