#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*/ printf(char *);
int /*<<< orphan*/ scanf(char *, int *);
int main(void) {
  int a;
  const int b = 4;
  printf("Provide the argument to the switch statement:");
  scanf("%d", &a);
  switch (a) {
  case 0:
    printf("Case 0\n");
    break;
  case 1:
    printf("Case 1\n");
    break;
  case 0 + 2:
    printf("Case 2\n");
    break;
  case 1 + 2:
    printf("Case 3\n");
    break;
  default:
    printf("Case DEFAULT\n");
    break;
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x4,-0xc(%rbp)
lea    0xed3(%rip),%rdi
call   1030 <printf@plt>
lea    0xef5(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf@plt>
mov    -0x8(%rbp),%eax
mov    %rax,-0x18(%rbp)
sub    $0x3,%rax
ja     11bb <main+0x9b>
mov    -0x18(%rbp),%rax
lea    0xe92(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xec3(%rip),%rdi
call   1030 <printf@plt>
jmp    11c7 <main+0xa7>
lea    0xeba(%rip),%rdi
call   1030 <printf@plt>
jmp    11c7 <main+0xa7>
lea    0xeb1(%rip),%rdi
call   1030 <printf@plt>
jmp    11c7 <main+0xa7>
lea    0xea8(%rip),%rdi
call   1030 <printf@plt>
jmp    11c7 <main+0xa7>
lea    0xe9f(%rip),%rdi
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xec8(%rip),%rdi
call   1040 <printf@plt>
lea    0xeea(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1050 <scanf@plt>
movslq 0x4(%rsp),%rax
cmp    $0x3,%rax
ja     1169 <main+0x39>
lea    0xefc(%rip),%rcx
movslq (%rcx,%rax,4),%rdi
add    %rcx,%rdi
jmp    1170 <main+0x40>
lea    0xedd(%rip),%rdi
call   1030 <puts@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [46 x i8] c"Provide the argument to the switch statement:\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [8 x i8] c"Case 0\0A\00"
@.str.3 = [8 x i8] c"Case 1\0A\00"
@.str.4 = [8 x i8] c"Case 2\0A\00"
@.str.5 = [8 x i8] c"Case 3\0A\00"
@.str.6 = [14 x i8] c"Case DEFAULT\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
store i32 0, i32* %1
store i32 4, i32* %3
%4 = call i32 @printf(i8* getelementptr inbounds ([46 x i8], [46 x i8]* @.str, i64 0, i64 0))
%5 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %2)
%6 = load i32, i32* %2
switch i32 %6, label %15 [
i32 0, label %7
i32 1, label %9
i32 2, label %11
i32 3, label %13
]
7: ; preds = %0
%8 = call i32 @printf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0))
br label %17
9: ; preds = %0
%10 = call i32 @printf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.3, i64 0, i64 0))
br label %17
11: ; preds = %0
%12 = call i32 @printf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.4, i64 0, i64 0))
br label %17
13: ; preds = %0
%14 = call i32 @printf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.5, i64 0, i64 0))
br label %17
15: ; preds = %0
%16 = call i32 @printf(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.6, i64 0, i64 0))
br label %17
17: ; preds = %15, %13, %11, %9, %7
ret i32 0
}

LLVM IR (-O2):
@.str = [46 x i8] c"Provide the argument to the switch statement:\00"
@.str.1 = [3 x i8] c"%d\00"
@str = [7 x i8] c"Case 3\00"
@str.7 = [7 x i8] c"Case 2\00"
@str.8 = [7 x i8] c"Case 1\00"
@str.9 = [7 x i8] c"Case 0\00"
@str.10 = [13 x i8] c"Case DEFAULT\00"
@reltable.main = [4 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @str.9 to i64), i64 ptrtoint ([4 x i32]* @reltable.main to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @str.8 to i64), i64 ptrtoint ([4 x i32]* @reltable.main to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @str.7 to i64), i64 ptrtoint ([4 x i32]* @reltable.main to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @str to i64), i64 ptrtoint ([4 x i32]* @reltable.main to i64)) to i32)]
define i32 @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
%3 = tail call i32 @printf(i8* dereferenceable(1) getelementptr inbounds ([46 x i8], [46 x i8]* @.str, i64 0, i64 0))
%4 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %1)
%5 = load i32, i32* %1
%6 = icmp ult i32 %5, 4
br i1 %6, label %7, label %11
7: ; preds = %0
%8 = sext i32 %5 to i64
%9 = shl i64 %8, 2
%10 = call i8* @llvm.load.relative.i64(i8* bitcast ([4 x i32]* @reltable.main to i8*), i64 %9)
br label %11
11: ; preds = %0, %7
%12 = phi i8* [ %10, %7 ], [ getelementptr inbounds ([13 x i8], [13 x i8]* @str.10, i64 0, i64 0), %0 ]
%13 = call i32 @puts(i8* dereferenceable(1) %12)
ret i32 0
}