Ways to fill the stack

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In this function:
void foo(void)
{
  const char a1[6] = {'t','e','s','t','1','2'};
  bar(a1);
  const char a2[6] = ("test12");
  bar(a2);
  return;
}
In case of bar(a1) it stores string in this way:
	movb	$116, -16(%rbp)
	movb	$101, -15(%rbp)
	movb	$115, -14(%rbp)
	movb	$116, -13(%rbp)
	movb	$49, -12(%rbp)
	movb	$50, -11(%rbp)
But in case of bar(a2):
	movl	$1953719668, -32(%rbp)
	movw	$12849, -28(%rbp)
	leaq	-32(%rbp), %rax
Can somebody explain me this? Why not use push instruction?


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