gcc 7.0(HEAD) -std=c++1z -03

input.cpp

#include <cstdio>
#include <string>

int main() {
  using namespace std::literals::string_literals;
  for (char c: "Hello"s) {
    std::printf("(%d)", c);
  }
}

output.s

.LC0:
        .string "(%d)"
main:
        pushq   %rbp
        pushq   %rbx
        subq    $40, %rsp
        leaq    16(%rsp), %rbx
        leaq    21(%rsp), %rbp
        movl    $1819043144, 16(%rsp)
        movq    $5, 8(%rsp)
        movb    $111, 4(%rbx)
        movq    %rbx, (%rsp)
        movb    $0, 21(%rsp)
.L2:
        movsbl  (%rbx), %esi
        movl    $.LC0, %edi
        xorl    %eax, %eax
        call    printf
        addq    $1, %rbx
        cmpq    %rbx, %rbp
        jne     .L2
        movq    (%rsp), %rdi
        leaq    16(%rsp), %rax
        cmpq    %rax, %rdi
        je      .L7
        call    operator delete(void*)
.L7:
        addq    $40, %rsp
        xorl    %eax, %eax
        popq    %rbx
        popq    %rbp
        ret
        movq    (%rsp), %rdi
        leaq    16(%rsp), %rdx
        movq    %rax, %rbx
        cmpq    %rdx, %rdi
        je      .L5
        call    operator delete(void*)
.L5:
        movq    %rbx, %rdi
        call    _Unwind_Resume

http://d.hatena.ne.jp/yohhoy/20161204/p1 (ja)