Page 111 - ARM 64 Bit Assembly Language
P. 111
Data processing and other instructions 97
37 bl scanf
38 adr x1, dataIn
39 ldr x20, [x1] // y
40
41 // longMul(x, y)
42 mov x0, x19
43 mov x1, x20
44 bl longMul
45
46 // printf("%18lx * %18lx = %18lx%18lx\n", x, y, hi, lo)
47 mov x4, x0 // lo
48 mov x3, x1 // hi
49 mov x2, x20 // y
50 mov x1, x19 // x
51 adr x0, fmtResult
52 bl printf
53
54 // return 0
55 mov w0, #0
56 ldp x19, x20, [sp, #16] // Callee-saved
57 ldp x29, x30, [sp], #32
58 ret
59 .size main, (. - main)
60
61 .data
62 dataIn:
63 .skip 8
64
65 .section .rodata
66 prompt:
67 .string "Enter a number in hex: "
68 fmtScan:
69 .string "%lx"
70 fmtResult:
71 .string "%016lx * %016lx = %016lx%016lx\n"
4.2.8 Division operations
There are only two division instructions in AArch64:
sdiv Signed divide and
udiv Unsigned divide.
4.2.8.1 Syntax
<op> Rd, Rm, Rn
