optimization in variable search

src/basic/engine_variables/fetch_variable.s

@@ -130,13 +130,15 @@ fetch_variable_find_addr_loop:
 	// Compare current variable name with searched one
 	// XXX consider creating optimized version for 46K/50K memory models
 
+#if CONFIG_MEMORY_MODEL_46K || CONFIG_MEMORY_MODEL_50K
+	jsr helper_cmp_varnam
+#else
+
 	ldy #$00
 
 #if CONFIG_MEMORY_MODEL_60K
 	ldx #<VARPNT
 	jsr peek_under_roms
-#elif CONFIG_MEMORY_MODEL_46K || CONFIG_MEMORY_MODEL_50K
-	jsr peek_under_roms_via_VARPNT
 #else // CONFIG_MEMORY_MODEL_38K
 	lda (VARPNT),y
 #endif
@@ -148,13 +150,14 @@ fetch_variable_find_addr_loop:
 
 #if CONFIG_MEMORY_MODEL_60K
 	jsr peek_under_roms
-#elif CONFIG_MEMORY_MODEL_46K || CONFIG_MEMORY_MODEL_50K
-	jsr peek_under_roms_via_VARPNT
 #else // CONFIG_MEMORY_MODEL_38K
 	lda (VARPNT),y
 #endif
 
 	cmp VARNAM+1
+
+#endif
+
 	bne fetch_variable_find_addr_next
 
 	// FALLTROUGH