blob: e48e7a5ab5a910b720c2a5738b3e73db5e8da780 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
|
# 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`.
|
