Add %if and %if-else macros, refactor, add indirection levels

1 files changed, 35 insertions, 0 deletions

diff --git a/atk16_schasm/note.md b/atk16_schasm/note.md
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+# note about loads & stores
+
+the indirection count tells the CPU how many times to dereference the address before reading or writing the value. in loads, the value can range from 0 to 3, and in stores, the value can range from 1 to 3. the indirection count is 0-indexed, so a value of 0 means no indirection, 1 means one level of indirection, and so on.
+
+    ;; asm
+    (ld R0 (u16 #x1234) indirect: 0)
+    ;; equivalent pseudocode
+    R0 := 0x1234
+
+    ;; asm
+    (ld R0 (u16 #x1234) indirect: 2)
+    ;; equivalent pseudocode
+    R0 := **(0x1234)
+
+    ;; asm
+    (ld R0 R1)
+    ;; equivalent pseudocode
+    R0 := R1
+
+    ;; asm
+    (ld R0 R1 indirect: 3)
+    ;; equivalent pseudocode
+    R0 := ***R1
+
+    ;; asm
+    (st R0 (u16 #x1234) indirect: 2)
+    ;; equivalent pseudocode
+    **(0x1234) := R0
+
+    ;; asm
+    (st R0 R1 indirect: 1)
+    ;; equivalent pseudocode
+    *R1 := R0
+
+a load with an indirection count of 0 in reg mode is a `mov`.