#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 */
const char *get_region_name_CN(int region_code) {
  switch (region_code) {
  case 1:
    return "Anhui";
  case 2:
    return "Zhejiang";
  case 3:
    return "Jiangxi";
  case 4:
    return "Jiangsu";
  case 5:
    return "Jilin";
  case 6:
    return "Qinghai";
  case 7:
    return "Fujian";
  case 8:
    return "Heilongjiang";
  case 9:
    return "Henan";
  case 10:
    return "Hebei";
  case 11:
    return "Hunan";
  case 12:
    return "Hubei";
  case 13:
    return "Xinjiang";
  case 14:
    return "Xizang";
  case 15:
    return "Gansu";
  case 16:
    return "Guangxi";
  case 18:
    return "Guizhou";
  case 19:
    return "Liaoning";
  case 20:
    return "Nei Mongol";
  case 21:
    return "Ningxia";
  case 22:
    return "Beijing";
  case 23:
    return "Shanghai";
  case 24:
    return "Shanxi";
  case 25:
    return "Shandong";
  case 26:
    return "Shaanxi";
  case 28:
    return "Tianjin";
  case 29:
    return "Yunnan";
  case 30:
    return "Guangdong";
  case 31:
    return "Hainan";
  case 32:
    return "Sichuan";
  case 33:
    return "Chongqing";
  default:
    return NULL;
  }
}


x86 assembly (clang, -O0):
<get_region_name_CN>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
add    $0xffffffff,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0x20,%eax
ja     1320 <get_region_name_CN+0x220>
mov    -0x18(%rbp),%rax
lea    0xed9(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xf4d(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xf43(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xf3c(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xf34(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xf2c(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xf22(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xf1a(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xf11(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xf0e(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xf04(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xefa(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xef0(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xee6(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xedf(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xed6(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xecc(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xec4(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xebc(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xeb5(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xeb0(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xea8(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xea0(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xe99(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xe90(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xe89(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xe81(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xe79(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xe70(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xe6a(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xe61(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
lea    0xe59(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    1328 <get_region_name_CN+0x228>
movq   $0x0,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<get_region_name_CN>:
add    $0xffffffff,%edi
cmp    $0x20,%edi
ja     1117 <get_region_name_CN+0x17>
movslq %edi,%rax
lea    0x2c36(%rip),%rcx
mov    (%rcx,%rax,8),%rax
ret
xor    %eax,%eax
ret

LLVM IR (-O0):
@.str = [6 x i8] c"Anhui\00"
@.str.1 = [9 x i8] c"Zhejiang\00"
@.str.2 = [8 x i8] c"Jiangxi\00"
@.str.3 = [8 x i8] c"Jiangsu\00"
@.str.4 = [6 x i8] c"Jilin\00"
@.str.5 = [8 x i8] c"Qinghai\00"
@.str.6 = [7 x i8] c"Fujian\00"
@.str.7 = [13 x i8] c"Heilongjiang\00"
@.str.8 = [6 x i8] c"Henan\00"
@.str.9 = [6 x i8] c"Hebei\00"
@.str.10 = [6 x i8] c"Hunan\00"
@.str.11 = [6 x i8] c"Hubei\00"
@.str.12 = [9 x i8] c"Xinjiang\00"
@.str.13 = [7 x i8] c"Xizang\00"
@.str.14 = [6 x i8] c"Gansu\00"
@.str.15 = [8 x i8] c"Guangxi\00"
@.str.16 = [8 x i8] c"Guizhou\00"
@.str.17 = [9 x i8] c"Liaoning\00"
@.str.18 = [11 x i8] c"Nei Mongol\00"
@.str.19 = [8 x i8] c"Ningxia\00"
@.str.20 = [8 x i8] c"Beijing\00"
@.str.21 = [9 x i8] c"Shanghai\00"
@.str.22 = [7 x i8] c"Shanxi\00"
@.str.23 = [9 x i8] c"Shandong\00"
@.str.24 = [8 x i8] c"Shaanxi\00"
@.str.25 = [8 x i8] c"Tianjin\00"
@.str.26 = [7 x i8] c"Yunnan\00"
@.str.27 = [10 x i8] c"Guangdong\00"
@.str.28 = [7 x i8] c"Hainan\00"
@.str.29 = [8 x i8] c"Sichuan\00"
@.str.30 = [10 x i8] c"Chongqing\00"
define i8* @get_region_name_CN(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %36 [
i32 1, label %5
i32 2, label %6
i32 3, label %7
i32 4, label %8
i32 5, label %9
i32 6, label %10
i32 7, label %11
i32 8, label %12
i32 9, label %13
i32 10, label %14
i32 11, label %15
i32 12, label %16
i32 13, label %17
i32 14, label %18
i32 15, label %19
i32 16, label %20
i32 18, label %21
i32 19, label %22
i32 20, label %23
i32 21, label %24
i32 22, label %25
i32 23, label %26
i32 24, label %27
i32 25, label %28
i32 26, label %29
i32 28, label %30
i32 29, label %31
i32 30, label %32
i32 31, label %33
i32 32, label %34
i32 33, label %35
]
5: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i8** %2
br label %37
6: ; preds = %1
store i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %37
7: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %37
8: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %37
9: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %37
10: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %37
11: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %37
12: ; preds = %1
store i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %37
13: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.8, i64 0, i64 0), i8** %2
br label %37
14: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.9, i64 0, i64 0), i8** %2
br label %37
15: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.10, i64 0, i64 0), i8** %2
br label %37
16: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.11, i64 0, i64 0), i8** %2
br label %37
17: ; preds = %1
store i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.12, i64 0, i64 0), i8** %2
br label %37
18: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.13, i64 0, i64 0), i8** %2
br label %37
19: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.14, i64 0, i64 0), i8** %2
br label %37
20: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.15, i64 0, i64 0), i8** %2
br label %37
21: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.16, i64 0, i64 0), i8** %2
br label %37
22: ; preds = %1
store i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.17, i64 0, i64 0), i8** %2
br label %37
23: ; preds = %1
store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.18, i64 0, i64 0), i8** %2
br label %37
24: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.19, i64 0, i64 0), i8** %2
br label %37
25: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.20, i64 0, i64 0), i8** %2
br label %37
26: ; preds = %1
store i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.21, i64 0, i64 0), i8** %2
br label %37
27: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.22, i64 0, i64 0), i8** %2
br label %37
28: ; preds = %1
store i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.23, i64 0, i64 0), i8** %2
br label %37
29: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.24, i64 0, i64 0), i8** %2
br label %37
30: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.25, i64 0, i64 0), i8** %2
br label %37
31: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.26, i64 0, i64 0), i8** %2
br label %37
32: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.27, i64 0, i64 0), i8** %2
br label %37
33: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.28, i64 0, i64 0), i8** %2
br label %37
34: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.29, i64 0, i64 0), i8** %2
br label %37
35: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.30, i64 0, i64 0), i8** %2
br label %37
36: ; preds = %1
store i8* null, i8** %2
br label %37
37: ; preds = %36, %35, %34, %33, %32, %31, %30, %29, %28, %27, %26, %25, %24, %23, %22, %21, %20, %19, %18, %17, %16, %15, %14, %13, %12, %11, %10, %9, %8, %7, %6, %5
%38 = load i8*, i8** %2
ret i8* %38
}

LLVM IR (-O2):
@.str = [6 x i8] c"Anhui\00"
@.str.1 = [9 x i8] c"Zhejiang\00"
@.str.2 = [8 x i8] c"Jiangxi\00"
@.str.3 = [8 x i8] c"Jiangsu\00"
@.str.4 = [6 x i8] c"Jilin\00"
@.str.5 = [8 x i8] c"Qinghai\00"
@.str.6 = [7 x i8] c"Fujian\00"
@.str.7 = [13 x i8] c"Heilongjiang\00"
@.str.8 = [6 x i8] c"Henan\00"
@.str.9 = [6 x i8] c"Hebei\00"
@.str.10 = [6 x i8] c"Hunan\00"
@.str.11 = [6 x i8] c"Hubei\00"
@.str.12 = [9 x i8] c"Xinjiang\00"
@.str.13 = [7 x i8] c"Xizang\00"
@.str.14 = [6 x i8] c"Gansu\00"
@.str.15 = [8 x i8] c"Guangxi\00"
@.str.16 = [8 x i8] c"Guizhou\00"
@.str.17 = [9 x i8] c"Liaoning\00"
@.str.18 = [11 x i8] c"Nei Mongol\00"
@.str.19 = [8 x i8] c"Ningxia\00"
@.str.20 = [8 x i8] c"Beijing\00"
@.str.21 = [9 x i8] c"Shanghai\00"
@.str.22 = [7 x i8] c"Shanxi\00"
@.str.23 = [9 x i8] c"Shandong\00"
@.str.24 = [8 x i8] c"Shaanxi\00"
@.str.25 = [8 x i8] c"Tianjin\00"
@.str.26 = [7 x i8] c"Yunnan\00"
@.str.27 = [10 x i8] c"Guangdong\00"
@.str.28 = [7 x i8] c"Hainan\00"
@.str.29 = [8 x i8] c"Sichuan\00"
@.str.30 = [10 x i8] c"Chongqing\00"
@switch.table.get_region_name_CN = [33 x i8*] [i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.1, i64 0, i64 0), i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0), i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.3, i64 0, i64 0), i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.4, i64 0, i64 0), i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.5, i64 0, i64 0), i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.6, i64 0, i64 0), i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.7, i64 0, i64 0), i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.8, i64 0, i64 0), i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.9, i64 0, i64 0), i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.10, i64 0, i64 0), i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.11, i64 0, i64 0), i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.12, i64 0, i64 0), i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.13, i64 0, i64 0), i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.14, i64 0, i64 0), i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.15, i64 0, i64 0), i8* null, i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.16, i64 0, i64 0), i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.17, i64 0, i64 0), i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.18, i64 0, i64 0), i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.19, i64 0, i64 0), i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.20, i64 0, i64 0), i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.21, i64 0, i64 0), i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.22, i64 0, i64 0), i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.23, i64 0, i64 0), i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.24, i64 0, i64 0), i8* null, i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.25, i64 0, i64 0), i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.26, i64 0, i64 0), i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.27, i64 0, i64 0), i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.28, i64 0, i64 0), i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.29, i64 0, i64 0), i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.30, i64 0, i64 0)]
define i8* @get_region_name_CN(i32 %0) {
%2 = add i32 %0, -1
%3 = icmp ult i32 %2, 33
br i1 %3, label %4, label %8
4: ; preds = %1
%5 = sext i32 %2 to i64
%6 = getelementptr inbounds [33 x i8*], [33 x i8*]* @switch.table.get_region_name_CN, i64 0, i64 %5
%7 = load i8*, i8** %6
br label %8
8: ; preds = %1, %4
%9 = phi i8* [ %7, %4 ], [ null, %1 ]
ret i8* %9
}