#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */

/* Variables and functions */
int /*<<< orphan*/ getchar();
int /*<<< orphan*/ printf(char *);
int /*<<< orphan*/ scanf(char *, int *);
int menu() {
  int choice;
  printf("\n");
  printf("=== Lexical Analyzer ===\n");
  printf("[1] Start\n");
  printf("[2] Exit\n");
  printf("========================\n");
  printf("Choice: ");
  scanf("%d", &choice);
  getchar();
  return choice;
}


x86 assembly (clang, -O0):
<menu>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
lea    0xed9(%rip),%rdi
call   1030 <printf@plt>
lea    0xeb5(%rip),%rdi
call   1030 <printf@plt>
lea    0xec3(%rip),%rdi
call   1030 <printf@plt>
lea    0xec2(%rip),%rdi
call   1030 <printf@plt>
lea    0xec0(%rip),%rdi
call   1030 <printf@plt>
lea    0xece(%rip),%rdi
call   1030 <printf@plt>
lea    0xecb(%rip),%rdi
lea    -0x4(%rbp),%rsi
call   1050 <scanf@plt>
mov    $0x0,%al
call   1040 <getchar@plt>
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<menu>:
push   %rax
mov    $0xa,%edi
call   1030 <putchar@plt>
lea    0xeaa(%rip),%rdi
call   1040 <puts@plt>
lea    0xeb7(%rip),%rdi
call   1040 <puts@plt>
lea    0xeb5(%rip),%rdi
call   1040 <puts@plt>
lea    0xeb2(%rip),%rdi
call   1040 <puts@plt>
lea    0xe6e(%rip),%rdi
call   1050 <printf@plt>
lea    0xe6b(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1070 <scanf@plt>
xor    %eax,%eax
call   1060 <getchar@plt>
mov    0x4(%rsp),%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [2 x i8] c"\0A\00"
@.str.1 = [26 x i8] c"=== Lexical Analyzer ===\0A\00"
@.str.2 = [11 x i8] c"[1] Start\0A\00"
@.str.3 = [10 x i8] c"[2] Exit\0A\00"
@.str.4 = [26 x i8] c"========================\0A\00"
@.str.5 = [9 x i8] c"Choice: \00"
@.str.6 = [3 x i8] c"%d\00"
define i32 @menu() {
%1 = alloca i32
%2 = call i32 @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
%3 = call i32 @printf(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.1, i64 0, i64 0))
%4 = call i32 @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.2, i64 0, i64 0))
%5 = call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.3, i64 0, i64 0))
%6 = call i32 @printf(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.4, i64 0, i64 0))
%7 = call i32 @printf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.5, i64 0, i64 0))
%8 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.6, i64 0, i64 0), i32* %1)
%9 = call i32 (...) @getchar()
%10 = load i32, i32* %1
ret i32 %10
}

LLVM IR (-O2):
@.str.5 = [9 x i8] c"Choice: \00"
@.str.6 = [3 x i8] c"%d\00"
@str = [25 x i8] c"=== Lexical Analyzer ===\00"
@str.7 = [10 x i8] c"[1] Start\00"
@str.8 = [9 x i8] c"[2] Exit\00"
@str.9 = [25 x i8] c"========================\00"
define i32 @menu() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
%3 = tail call i32 @putchar(i32 10)
%4 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([25 x i8], [25 x i8]* @str, i64 0, i64 0))
%5 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([10 x i8], [10 x i8]* @str.7, i64 0, i64 0))
%6 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([9 x i8], [9 x i8]* @str.8, i64 0, i64 0))
%7 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([25 x i8], [25 x i8]* @str.9, i64 0, i64 0))
%8 = tail call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([9 x i8], [9 x i8]* @.str.5, i64 0, i64 0))
%9 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.6, i64 0, i64 0), i32* %1)
%10 = call i32 (...) @getchar()
%11 = load i32, i32* %1
ret i32 %11
}