#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 user_func(int no) {
  switch (no) {
  case 1:
    printf("Get SIGHUP.\n");
    break;
  case 2:
    printf("Get SIGINT\n");
    break;
  case 3:
    printf("Get SIGQUIT \n");
    break;
  default:
    printf("What wan yi a \n\n");
    break;
  }
}


x86 assembly (clang, -O0):
<user_func>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %edi,-0x4(%rbp)
mov    -0x4(%rbp),%eax
mov    %eax,-0x8(%rbp)
sub    $0x1,%eax
je     1151 <user_func+0x41>
jmp    112f <user_func+0x1f>
mov    -0x8(%rbp),%eax
sub    $0x2,%eax
je     1162 <user_func+0x52>
jmp    1140 <user_func+0x30>
mov    -0x8(%rbp),%eax
sub    $0x3,%eax
je     1173 <user_func+0x63>
jmp    1184 <user_func+0x74>
lea    0xea8(%rip),%rdi
call   1030 <printf@plt>
jmp    1190 <user_func+0x80>
lea    0xea4(%rip),%rdi
call   1030 <printf@plt>
jmp    1190 <user_func+0x80>
lea    0xe9f(%rip),%rdi
call   1030 <printf@plt>
jmp    1190 <user_func+0x80>
lea    0xe9c(%rip),%rdi
call   1030 <printf@plt>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<user_func>:
add    $0xffffffff,%edi
cmp    $0x2,%edi
ja     112e <user_func+0x1e>
movslq %edi,%rax
lea    0xf12(%rip),%rcx
movslq (%rcx,%rax,4),%rdi
add    %rcx,%rdi
jmp    1030 <puts@plt>
lea    0xeef(%rip),%rdi
jmp    1030 <puts@plt>

LLVM IR (-O0):
@.str = [13 x i8] c"Get SIGHUP.\0A\00"
@.str.1 = [12 x i8] c"Get SIGINT\0A\00"
@.str.2 = [14 x i8] c"Get SIGQUIT \0A\00"
@.str.3 = [17 x i8] c"What wan yi a \0A\0A\00"
define void @user_func(i32 %0) {
%2 = alloca i32
store i32 %0, i32* %2
%3 = load i32, i32* %2
switch i32 %3, label %10 [
i32 1, label %4
i32 2, label %6
i32 3, label %8
]
4: ; preds = %1
%5 = call i32 @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str, i64 0, i64 0))
br label %12
6: ; preds = %1
%7 = call i32 @printf(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.1, i64 0, i64 0))
br label %12
8: ; preds = %1
%9 = call i32 @printf(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.2, i64 0, i64 0))
br label %12
10: ; preds = %1
%11 = call i32 @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.3, i64 0, i64 0))
br label %12
12: ; preds = %10, %8, %6, %4
ret void
}

LLVM IR (-O2):
@str = [13 x i8] c"Get SIGQUIT \00"
@str.4 = [11 x i8] c"Get SIGINT\00"
@str.5 = [12 x i8] c"Get SIGHUP.\00"
@str.6 = [16 x i8] c"What wan yi a \0A\00"
@reltable.user_func = [3 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([12 x i8]* @str.5 to i64), i64 ptrtoint ([3 x i32]* @reltable.user_func to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([11 x i8]* @str.4 to i64), i64 ptrtoint ([3 x i32]* @reltable.user_func to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([13 x i8]* @str to i64), i64 ptrtoint ([3 x i32]* @reltable.user_func to i64)) to i32)]
define void @user_func(i32 %0) {
%2 = add i32 %0, -1
%3 = icmp ult i32 %2, 3
br i1 %3, label %4, label %8
4: ; preds = %1
%5 = sext i32 %2 to i64
%6 = shl i64 %5, 2
%7 = call i8* @llvm.load.relative.i64(i8* bitcast ([3 x i32]* @reltable.user_func to i8*), i64 %6)
br label %8
8: ; preds = %1, %4
%9 = phi i8* [ %7, %4 ], [ getelementptr inbounds ([16 x i8], [16 x i8]* @str.6, i64 0, i64 0), %1 ]
%10 = tail call i32 @puts(i8* dereferenceable(1) %9)
ret void
}