$ cat signed.c
#include <stdio.h>

int main(void){
	int num;

	scanf("%d", &num);
	printf("%d\n", num/16);

	return 0;
}
$ gcc signed.c -Ofast -c
$ objdump -d signed.o

signed.o:     file format elf64-x86-64


Disassembly of section .text.startup:

0000000000000000 <main>:
   0:	48 83 ec 18          	sub    $0x18,%rsp
   4:	bf 00 00 00 00       	mov    $0x0,%edi
   9:	31 c0                	xor    %eax,%eax
   b:	48 8d 74 24 0c       	lea    0xc(%rsp),%rsi
  10:	e8 00 00 00 00       	callq  15 <main+0x15>
  15:	8b 44 24 0c          	mov    0xc(%rsp),%eax
  19:	bf 00 00 00 00       	mov    $0x0,%edi
  1e:	8d 70 0f             	lea    0xf(%rax),%esi
  21:	85 c0                	test   %eax,%eax
  23:	0f 49 f0             	cmovns %eax,%esi
  26:	31 c0                	xor    %eax,%eax
  28:	c1 fe 04             	sar    $0x4,%esi
  2b:	e8 00 00 00 00       	callq  30 <main+0x30>
  30:	31 c0                	xor    %eax,%eax
  32:	48 83 c4 18          	add    $0x18,%rsp
  36:	c3                   	retq
$
$
$ cat unsigned.c
#include <stdio.h>

int main(void){
	unsigned int num;

	scanf("%d", &num);
	printf("%d\n", num/16);

	return 0;
}
$ gcc unsigned.c -Ofast -c
$ objdump -d unsigned.o

unsigned.o:     file format elf64-x86-64


Disassembly of section .text.startup:

0000000000000000 <main>:
   0:	48 83 ec 18          	sub    $0x18,%rsp
   4:	bf 00 00 00 00       	mov    $0x0,%edi
   9:	31 c0                	xor    %eax,%eax
   b:	48 8d 74 24 0c       	lea    0xc(%rsp),%rsi
  10:	e8 00 00 00 00       	callq  15 <main+0x15>
  15:	8b 74 24 0c          	mov    0xc(%rsp),%esi
  19:	bf 00 00 00 00       	mov    $0x0,%edi
  1e:	31 c0                	xor    %eax,%eax
  20:	c1 ee 04             	shr    $0x4,%esi
  23:	e8 00 00 00 00       	callq  28 <main+0x28>
  28:	31 c0                	xor    %eax,%eax
  2a:	48 83 c4 18          	add    $0x18,%rsp
  2e:	c3                   	retq