Use zero page locations as as pseudo-registers; 8-bit multiplication and 16-bit shifts

2026-04-19 10:42:10 +00:00 · 2018-03-05 12:05:37 +01:00
parent 656dbef184
commit 15dbaad6d1
27 changed files with 559 additions and 55 deletions
@@ -0,0 +1,15 @@
+
+inline asm byte __mul_u8u8u8() {
+    ? LDA #0
+    ? JMP start
+add:
+    CLC
+    ADC __reg.lo
+loop:
+    ASL __reg.lo
+start:
+    LSR __reg.hi
+    BCS add
+    BNE loop
+    ? RTS
+}