#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 *);
void packet_disp_err(int err) {
  switch (err) {
  case 1:
    printf("User exist!\n");
    break;
  case 2:
    printf("Database is error!\n");
    break;
  case 3:
    printf("User name is not exist or password is error.\n");
    break;
  case 4:
    printf("Word is not exist.\n");
    break;
  default:
    break;
  }
}


x86 assembly (clang, -O0):
<packet_disp_err>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %edi,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0xffffffff,%eax
mov    %eax,%ecx
mov    %rcx,-0x10(%rbp)
sub    $0x3,%eax
ja     1188 <packet_disp_err+0x78>
mov    -0x10(%rbp),%rax
lea    0xec5(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xec5(%rip),%rdi
call   1030 <printf@plt>
jmp    118d <packet_disp_err+0x7d>
lea    0xec1(%rip),%rdi
call   1030 <printf@plt>
jmp    118d <packet_disp_err+0x7d>
lea    0xec4(%rip),%rdi
call   1030 <printf@plt>
jmp    118d <packet_disp_err+0x7d>
lea    0xee1(%rip),%rdi
call   1030 <printf@plt>
jmp    118d <packet_disp_err+0x7d>
jmp    118d <packet_disp_err+0x7d>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<packet_disp_err>:
add    $0xffffffff,%edi
cmp    $0x3,%edi
ja     112e <packet_disp_err+0x1e>
movslq %edi,%rax
lea    0xf3e(%rip),%rcx
movslq (%rcx,%rax,4),%rdi
add    %rcx,%rdi
jmp    1030 <puts@plt>
ret

LLVM IR (-O0):
@.str = [13 x i8] c"User exist!\0A\00"
@.str.1 = [20 x i8] c"Database is error!\0A\00"
@.str.2 = [46 x i8] c"User name is not exist or password is error.\0A\00"
@.str.3 = [20 x i8] c"Word is not exist.\0A\00"
define void @packet_disp_err(i32 %0) {
%2 = alloca i32
store i32 %0, i32* %2
%3 = load i32, i32* %2
switch i32 %3, label %12 [
i32 1, label %4
i32 2, label %6
i32 3, label %8
i32 4, label %10
]
4: ; preds = %1
%5 = call i32 @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str, i64 0, i64 0))
br label %13
6: ; preds = %1
%7 = call i32 @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.1, i64 0, i64 0))
br label %13
8: ; preds = %1
%9 = call i32 @printf(i8* getelementptr inbounds ([46 x i8], [46 x i8]* @.str.2, i64 0, i64 0))
br label %13
10: ; preds = %1
%11 = call i32 @printf(i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.3, i64 0, i64 0))
br label %13
12: ; preds = %1
br label %13
13: ; preds = %12, %10, %8, %6, %4
ret void
}

LLVM IR (-O2):
@str = [19 x i8] c"Word is not exist.\00"
@str.4 = [45 x i8] c"User name is not exist or password is error.\00"
@str.5 = [19 x i8] c"Database is error!\00"
@str.6 = [12 x i8] c"User exist!\00"
@reltable.packet_disp_err = [4 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([12 x i8]* @str.6 to i64), i64 ptrtoint ([4 x i32]* @reltable.packet_disp_err to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([19 x i8]* @str.5 to i64), i64 ptrtoint ([4 x i32]* @reltable.packet_disp_err to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([45 x i8]* @str.4 to i64), i64 ptrtoint ([4 x i32]* @reltable.packet_disp_err to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([19 x i8]* @str to i64), i64 ptrtoint ([4 x i32]* @reltable.packet_disp_err to i64)) to i32)]
define void @packet_disp_err(i32 %0) {
%2 = add i32 %0, -1
%3 = icmp ult i32 %2, 4
br i1 %3, label %4, label %9
4: ; preds = %1
%5 = sext i32 %2 to i64
%6 = shl i64 %5, 2
%7 = call i8* @llvm.load.relative.i64(i8* bitcast ([4 x i32]* @reltable.packet_disp_err to i8*), i64 %6)
%8 = tail call i32 @puts(i8* dereferenceable(1) %7)
br label %9
9: ; preds = %1, %4
ret void
}