introduce a benchmark mode

src/asm/6502/macroInt.s

@@ -0,0 +1,32 @@
+macroState=$50 ; pointer to state
+macroAddr=$52  ; pointer to address
+
+; macro state takes 4 bytes
+; macroPos bits:
+; 7: had
+; 6: will
+
+; x: macro
+macroIntRun:
+  lda macroAddr,x
+  ora macroAddr+1,x
+  beq :+
+
+  ; do macro
+: rts
+
+; set the macro address, then call
+; x: macro
+macroIntInit:
+  lda #0
+  sta macroState,x
+  sta macroPos,x
+  txa
+  rol
+  tax
+  lda macroAddr,x
+  ora macroAddr+1,x
+  beq :+
+  lda #$40
+  sta macroState,x
+: rts