unify tables for squaring and multiplication

mandel.s

@@ -131,8 +131,6 @@ KEY_0     = 50
 
 .import mul_lobyte
 .import mul_hibyte
-.import sqr_lobyte
-.import sqr_hibyte
 
 .data
 
@@ -444,9 +442,13 @@ viewport_oy:
 ; clobbers a, x
 .macro sqr8 dest, arg
     ldx arg
-    lda sqr_lobyte,x
+    txa
+    lsr
+    lda mul_lobyte,x
+    rol
     sta dest
-    lda sqr_hibyte,x
+    lda mul_hibyte,x
+    rol
     sta dest + 1
 .endmacro
 

tables.js

@@ -16,8 +16,6 @@ console.log(
 
 .export mul_lobyte
 .export mul_hibyte
-.export sqr_lobyte
-.export sqr_hibyte
 
 ; (i * i) / 2 for the multiplier
 .align 256
@@ -28,13 +26,4 @@ ${db((i) => ((i * i) >> 1) & 0xff)}
 mul_hibyte:
 ${db((i) => ((i * i) >> 9) & 0xff)}
 
-; (i * i) for the plain squares
-.align 256
-sqr_lobyte:
-${db((i) => (i * i) & 0xff)}
-
-.align 256
-sqr_hibyte:
-${db((i) => ((i * i) >> 8) & 0xff)}
-
 `);