Optimize Integer#*

lib/ruby_vm/mjit/insn_compiler.rb

@@ -1684,7 +1684,10 @@ module RubyVM::MJIT
     # @param jit [RubyVM::MJIT::JITState]
     # @param ctx [RubyVM::MJIT::Context]
     # @param asm [RubyVM::MJIT::Assembler]
-    def jit_rb_obj_not(jit, ctx, asm)
+    def jit_rb_obj_not(jit, ctx, asm, argc)
+      return false if argc != 0
+      asm.comment('jit_rb_obj_not')
+
       recv = ctx.stack_pop
       # This `test` sets ZF only for Qnil and Qfalse, which let cmovz set.
       asm.test(recv, ~Qnil)
@@ -1696,16 +1699,42 @@ module RubyVM::MJIT
       true
     end
 
+    # @param jit [RubyVM::MJIT::JITState]
+    # @param ctx [RubyVM::MJIT::Context]
+    # @param asm [RubyVM::MJIT::Assembler]
+    def jit_rb_int_mul(jit, ctx, asm, argc)
+      return false if argc != 1
+      return false unless two_fixnums_on_stack?(jit)
+      asm.comment('jit_rb_int_mul')
+
+      side_exit = side_exit(jit, ctx)
+      guard_two_fixnums(jit, ctx, asm, side_exit)
+
+      jit_prepare_routine_call(jit, ctx, asm)
+
+      y_opnd = ctx.stack_pop
+      x_opnd = ctx.stack_pop
+      asm.mov(C_ARGS[0], x_opnd)
+      asm.mov(C_ARGS[1], y_opnd)
+      asm.call(C.rb_fix_mul_fix)
+
+      ret_opnd = ctx.stack_push
+      asm.mov(ret_opnd, C_RET)
+
+      true
+    end
+
     #
     # Helpers
     #
 
     def register_cfunc_codegen_funcs
-      register_cfunc_method(BasicObject, '!', :jit_rb_obj_not)
+      register_cfunc_method(BasicObject, :!, :jit_rb_obj_not)
+      register_cfunc_method(Integer, :*, :jit_rb_int_mul)
     end
 
-    def register_cfunc_method(klass, mid_str, func)
+    def register_cfunc_method(klass, mid_sym, func)
-      mid = C.rb_intern(mid_str)
+      mid = C.rb_intern(mid_sym.to_s)
       me = C.rb_method_entry_at(klass, mid)
 
       assert_equal(false, me.nil?)
@@ -2589,7 +2618,7 @@ module RubyVM::MJIT
       # Delegate to codegen for C methods if we have it.
       if flags & C.VM_CALL_KWARG == 0 && flags & C.VM_CALL_OPT_SEND == 0
         known_cfunc_codegen = lookup_cfunc_codegen(cme.def)
-        if known_cfunc_codegen&.call(jit, ctx, asm)
+        if known_cfunc_codegen&.call(jit, ctx, asm, argc)
           # cfunc codegen generated code. Terminate the block so
           # there isn't multiple calls in the same block.
           jump_to_next_insn(jit, ctx, asm)

mjit_c.rb

@@ -278,6 +278,10 @@ module RubyVM::MJIT # :nodoc: all
       me_addr == 0 ? nil : rb_method_entry_t.new(me_addr)
     end
 
+    def rb_fix_mul_fix
+      Primitive.cexpr! 'SIZET2NUM((size_t)rb_fix_mul_fix)'
+    end
+
     #========================================================================================
     #
     # Old stuff