#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() {
  int month;
  printf("Month number: ");
  scanf("%d", &month);
  switch (month) {
  case 1:
    printf("Jan.\n");
    break;
  case 2:
    printf("Feb.\n");
    break;
  case 3:
    printf("Mar.\n");
    break;
  case 4:
    printf("Apr.\n");
    break;
  case 5:
    printf("May\n");
    break;
  case 6:
    printf("June\n");
    break;
  case 7:
    printf("July\n");
    break;
  case 8:
    printf("Aug.\n");
    break;
  case 9:
    printf("Sept.\n");
    break;
  case 10:
    printf("Oct.\n");
    break;
  case 11:
    printf("Nov.\n");
    break;
  case 12:
    printf("Dec.\n");
    break;
  }
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xefa(%rip),%rdi
call   1030 <printf@plt>
lea    0xefd(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf@plt>
mov    -0x8(%rbp),%eax
add    $0xffffffff,%eax
mov    %eax,%ecx
mov    %rcx,-0x10(%rbp)
sub    $0xb,%eax
ja     123b <main+0x11b>
mov    -0x10(%rbp),%rax
lea    0xe95(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xec7(%rip),%rdi
call   1030 <printf@plt>
jmp    123b <main+0x11b>
lea    0xebc(%rip),%rdi
call   1030 <printf@plt>
jmp    123b <main+0x11b>
lea    0xeb1(%rip),%rdi
call   1030 <printf@plt>
jmp    123b <main+0x11b>
lea    0xea6(%rip),%rdi
call   1030 <printf@plt>
jmp    123b <main+0x11b>
lea    0xe9b(%rip),%rdi
call   1030 <printf@plt>
jmp    123b <main+0x11b>
lea    0xe8f(%rip),%rdi
call   1030 <printf@plt>
jmp    123b <main+0x11b>
lea    0xe84(%rip),%rdi
call   1030 <printf@plt>
jmp    123b <main+0x11b>
lea    0xe79(%rip),%rdi
call   1030 <printf@plt>
jmp    123b <main+0x11b>
lea    0xe6e(%rip),%rdi
call   1030 <printf@plt>
jmp    123b <main+0x11b>
lea    0xe64(%rip),%rdi
call   1030 <printf@plt>
jmp    123b <main+0x11b>
lea    0xe59(%rip),%rdi
call   1030 <printf@plt>
jmp    123b <main+0x11b>
lea    0xe4e(%rip),%rdi
call   1030 <printf@plt>
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rax
lea    0xec8(%rip),%rdi
call   1040 <printf@plt>
lea    0xecb(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1050 <scanf@plt>
mov    0x4(%rsp),%eax
add    $0xffffffff,%eax
cmp    $0xb,%eax
ja     116f <main+0x3f>
cltq
lea    0xeed(%rip),%rcx
movslq (%rcx,%rax,4),%rdi
add    %rcx,%rdi
call   1030 <puts@plt>
xor    %eax,%eax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [15 x i8] c"Month number: \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [6 x i8] c"Jan.\0A\00"
@.str.3 = [6 x i8] c"Feb.\0A\00"
@.str.4 = [6 x i8] c"Mar.\0A\00"
@.str.5 = [6 x i8] c"Apr.\0A\00"
@.str.6 = [5 x i8] c"May\0A\00"
@.str.7 = [6 x i8] c"June\0A\00"
@.str.8 = [6 x i8] c"July\0A\00"
@.str.9 = [6 x i8] c"Aug.\0A\00"
@.str.10 = [7 x i8] c"Sept.\0A\00"
@.str.11 = [6 x i8] c"Oct.\0A\00"
@.str.12 = [6 x i8] c"Nov.\0A\00"
@.str.13 = [6 x i8] c"Dec.\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
store i32 0, i32* %1
%3 = call i32 @printf(i8* getelementptr inbounds ([15 x i8], [15 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* %2)
%5 = load i32, i32* %2
switch i32 %5, label %30 [
i32 1, label %6
i32 2, label %8
i32 3, label %10
i32 4, label %12
i32 5, label %14
i32 6, label %16
i32 7, label %18
i32 8, label %20
i32 9, label %22
i32 10, label %24
i32 11, label %26
i32 12, label %28
]
6: ; preds = %0
%7 = call i32 @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.2, i64 0, i64 0))
br label %30
8: ; preds = %0
%9 = call i32 @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.3, i64 0, i64 0))
br label %30
10: ; preds = %0
%11 = call i32 @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.4, i64 0, i64 0))
br label %30
12: ; preds = %0
%13 = call i32 @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.5, i64 0, i64 0))
br label %30
14: ; preds = %0
%15 = call i32 @printf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.6, i64 0, i64 0))
br label %30
16: ; preds = %0
%17 = call i32 @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.7, i64 0, i64 0))
br label %30
18: ; preds = %0
%19 = call i32 @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.8, i64 0, i64 0))
br label %30
20: ; preds = %0
%21 = call i32 @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.9, i64 0, i64 0))
br label %30
22: ; preds = %0
%23 = call i32 @printf(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.10, i64 0, i64 0))
br label %30
24: ; preds = %0
%25 = call i32 @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.11, i64 0, i64 0))
br label %30
26: ; preds = %0
%27 = call i32 @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.12, i64 0, i64 0))
br label %30
28: ; preds = %0
%29 = call i32 @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.13, i64 0, i64 0))
br label %30
30: ; preds = %0, %28, %26, %24, %22, %20, %18, %16, %14, %12, %10, %8, %6
%31 = load i32, i32* %1
ret i32 %31
}

LLVM IR (-O2):
@.str = [15 x i8] c"Month number: \00"
@.str.1 = [3 x i8] c"%d\00"
@str = [5 x i8] c"Dec.\00"
@str.14 = [5 x i8] c"Nov.\00"
@str.15 = [5 x i8] c"Oct.\00"
@str.16 = [6 x i8] c"Sept.\00"
@str.17 = [5 x i8] c"Aug.\00"
@str.18 = [5 x i8] c"July\00"
@str.19 = [5 x i8] c"June\00"
@str.20 = [4 x i8] c"May\00"
@str.21 = [5 x i8] c"Apr.\00"
@str.22 = [5 x i8] c"Mar.\00"
@str.23 = [5 x i8] c"Feb.\00"
@str.24 = [5 x i8] c"Jan.\00"
@reltable.main = [12 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @str.24 to i64), i64 ptrtoint ([12 x i32]* @reltable.main to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @str.23 to i64), i64 ptrtoint ([12 x i32]* @reltable.main to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @str.22 to i64), i64 ptrtoint ([12 x i32]* @reltable.main to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @str.21 to i64), i64 ptrtoint ([12 x i32]* @reltable.main to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @str.20 to i64), i64 ptrtoint ([12 x i32]* @reltable.main to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @str.19 to i64), i64 ptrtoint ([12 x i32]* @reltable.main to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @str.18 to i64), i64 ptrtoint ([12 x i32]* @reltable.main to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @str.17 to i64), i64 ptrtoint ([12 x i32]* @reltable.main to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @str.16 to i64), i64 ptrtoint ([12 x i32]* @reltable.main to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @str.15 to i64), i64 ptrtoint ([12 x i32]* @reltable.main to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @str.14 to i64), i64 ptrtoint ([12 x i32]* @reltable.main to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @str to i64), i64 ptrtoint ([12 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 ([15 x i8], [15 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 = add i32 %5, -1
%7 = icmp ult i32 %6, 12
br i1 %7, label %8, label %13
8: ; preds = %0
%9 = sext i32 %6 to i64
%10 = shl i64 %9, 2
%11 = call i8* @llvm.load.relative.i64(i8* bitcast ([12 x i32]* @reltable.main to i8*), i64 %10)
%12 = call i32 @puts(i8* dereferenceable(1) %11)
br label %13
13: ; preds = %0, %8
ret i32 0
}