What does this Assembly snippet output?

1.global _main
2.align 2
3_main:
4    stp x29, x30, [sp, #-32]!
5    fmov d0, #3.5
6    fmov d1, #1.5
7    fsub d0, d0, d1
8    sub sp, sp, #16
9    str d0, [sp]
10    adrp x0, fmt@PAGE
11    add x0, x0, fmt@PAGEOFF
12    bl _printf
13    add sp, sp, #16
14    ldp x29, x30, [sp], #32
15    mov w0, #0
16    ret
17.section __TEXT,__cstring
18fmt: .asciz "%g\n"