#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*/ puts(char *);
int main() {
  for (int i = 0; i < 3; i++) {
    switch (i) {
    case 0:
      printf("i is 0\n");
      break;
    case 1:
    case 2:
      puts("i is 1 or 2");
    default:
      puts("this is default block");
    }
  }
  puts("finish");
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x0,-0x8(%rbp)
cmpl   $0x3,-0x8(%rbp)
jge    11a3 <main+0x83>
mov    -0x8(%rbp),%eax
mov    %eax,-0xc(%rbp)
test   %eax,%eax
je     1167 <main+0x47>
jmp    1153 <main+0x33>
mov    -0xc(%rbp),%eax
add    $0xffffffff,%eax
sub    $0x2,%eax
jb     1178 <main+0x58>
jmp    1184 <main+0x64>
lea    0xe92(%rip),%rdi
call   1040 <printf@plt>
jmp    1190 <main+0x70>
lea    0xe89(%rip),%rdi
call   1030 <puts@plt>
lea    0xe89(%rip),%rdi
call   1030 <puts@plt>
jmp    1195 <main+0x75>
mov    -0x8(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x8(%rbp)
jmp    1136 <main+0x16>
lea    0xe80(%rip),%rdi
call   1030 <puts@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
push   %rax
lea    0xf0e(%rip),%rdi
call   1030 <puts@plt>
lea    0xed9(%rip),%r14
mov    %r14,%rdi
call   1030 <puts@plt>
lea    0xed6(%rip),%rbx
mov    %rbx,%rdi
call   1030 <puts@plt>
mov    %r14,%rdi
call   1030 <puts@plt>
mov    %rbx,%rdi
call   1030 <puts@plt>
lea    0xecd(%rip),%rdi
call   1030 <puts@plt>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [8 x i8] c"i is 0\0A\00"
@.str.1 = [12 x i8] c"i is 1 or 2\00"
@.str.2 = [22 x i8] c"this is default block\00"
@.str.3 = [7 x i8] c"finish\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
store i32 0, i32* %1
store i32 0, i32* %2
br label %3
3: ; preds = %15, %0
%4 = load i32, i32* %2
%5 = icmp slt i32 %4, 3
br i1 %5, label %6, label %18
6: ; preds = %3
%7 = load i32, i32* %2
switch i32 %7, label %12 [
i32 0, label %8
i32 1, label %10
i32 2, label %10
]
8: ; preds = %6
%9 = call i32 @printf(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str, i64 0, i64 0))
br label %14
10: ; preds = %6, %6
%11 = call i32 @puts(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.1, i64 0, i64 0))
br label %12
12: ; preds = %6, %10
%13 = call i32 @puts(i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str.2, i64 0, i64 0))
br label %14
14: ; preds = %12, %8
br label %15
15: ; preds = %14
%16 = load i32, i32* %2
%17 = add nsw i32 %16, 1
store i32 %17, i32* %2
br label %3
18: ; preds = %3
%19 = call i32 @puts(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.3, i64 0, i64 0))
ret i32 0
}

LLVM IR (-O2):
@.str.1 = [12 x i8] c"i is 1 or 2\00"
@.str.2 = [22 x i8] c"this is default block\00"
@.str.3 = [7 x i8] c"finish\00"
@str = [7 x i8] c"i is 0\00"
define i32 @main() {
%1 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([7 x i8], [7 x i8]* @str, i64 0, i64 0))
%2 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([12 x i8], [12 x i8]* @.str.1, i64 0, i64 0))
%3 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([22 x i8], [22 x i8]* @.str.2, i64 0, i64 0))
%4 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([12 x i8], [12 x i8]* @.str.1, i64 0, i64 0))
%5 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([22 x i8], [22 x i8]* @.str.2, i64 0, i64 0))
%6 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([7 x i8], [7 x i8]* @.str.3, i64 0, i64 0))
ret i32 0
}