weird error, seems like bug

Using fasm 1.70.03 for Linux. First of all, this code isn't intended to do anything useful - it's just a small snippet to illustrate the problem. Look at the two commented lines.

Code:

format ELF64

section '.data' writable

public main

extrn "exit" as exit:qword
extrn "printf" as printf:qword

align 8
SC1 db "Hi.",0

section '.text' executable

main:

push rbp
mov rbp, rsp

mov qword [rbp - 16], rdi ; assembler accepts this instruction

mov rdi, SC1
mov rax, 0
call printf

call func
call exit

func:

push rbp
mov rbp, rsp

mov qword [rbp - 16], rdi ; this (identical) instruction causes assembly to fail, and it says that "call printf" has a "value out of range" error. Changing the - to a + stops it complaining
ret

This nasm equivalent assembles fine:

Code:

global main

extern printf
extern exit

section .DATA

align 8
SC1: db "Hi.",0

SECTION .TEXT

main:

push rbp
mov rbp, rsp

mov qword [rbp - 16], rdi ; nasm accepts this instruction

mov rdi, SC1
mov rax, 0
call printf

call func
call exit

func:

push rbp
mov rbp, rsp

mov qword [rbp - 16], rdi ; nasm accepts this instruction too
ret