#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 */
scalar_t__ strcasecmp(char const *, char *);
scalar_t__ strcmp(char const *, char *);
int parse_boolean(const char *line) {
  if (strcasecmp(line, "no") == 0 || strcasecmp(line, "false") == 0 ||
      strcmp(line, "0") == 0) {
    return 0;
  }
  if (strcasecmp(line, "yes") == 0 || strcasecmp(line, "true") == 0 ||
      strcmp(line, "1") == 0) {
    return 1;
  }
  return -1;
}


x86 assembly (clang, -O0):
<parse_boolean>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
lea    0xec9(%rip),%rsi
call   1030 <strcasecmp@plt>
cmp    $0x0,%rax
je     117a <parse_boolean+0x5a>
mov    -0x10(%rbp),%rdi
lea    0xeb2(%rip),%rsi
call   1030 <strcasecmp@plt>
cmp    $0x0,%rax
je     117a <parse_boolean+0x5a>
mov    -0x10(%rbp),%rdi
lea    0xe9e(%rip),%rsi
call   1040 <strcmp@plt>
cmp    $0x0,%rax
jne    1186 <parse_boolean+0x66>
movl   $0x0,-0x4(%rbp)
jmp    11e7 <parse_boolean+0xc7>
mov    -0x10(%rbp),%rdi
lea    0xe7a(%rip),%rsi
call   1030 <strcasecmp@plt>
cmp    $0x0,%rax
je     11d4 <parse_boolean+0xb4>
mov    -0x10(%rbp),%rdi
lea    0xe64(%rip),%rsi
call   1030 <strcasecmp@plt>
cmp    $0x0,%rax
je     11d4 <parse_boolean+0xb4>
mov    -0x10(%rbp),%rdi
lea    0xe4f(%rip),%rsi
call   1040 <strcmp@plt>
cmp    $0x0,%rax
jne    11e0 <parse_boolean+0xc0>
movl   $0x1,-0x4(%rbp)
jmp    11e7 <parse_boolean+0xc7>
movl   $0xffffffff,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<parse_boolean>:
push   %rbp
push   %rbx
push   %rax
mov    %rdi,%rbx
lea    0xed3(%rip),%rsi
call   1030 <strcasecmp@plt>
xor    %ebp,%ebp
test   %rax,%rax
je     11a5 <parse_boolean+0x85>
lea    0xec3(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcasecmp@plt>
test   %rax,%rax
je     11a5 <parse_boolean+0x85>
lea    0xeb5(%rip),%rsi
mov    %rbx,%rdi
call   1040 <strcmp@plt>
test   %rax,%rax
je     11a5 <parse_boolean+0x85>
lea    0xea3(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcasecmp@plt>
mov    $0x1,%ebp
test   %rax,%rax
je     11a5 <parse_boolean+0x85>
lea    0xe8e(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcasecmp@plt>
test   %rax,%rax
je     11a5 <parse_boolean+0x85>
lea    0xe7f(%rip),%rsi
mov    %rbx,%rdi
call   1040 <strcmp@plt>
neg    %rax
sbb    %ebp,%ebp
or     $0x1,%ebp
mov    %ebp,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
@.str = [3 x i8] c"no\00"
@.str.1 = [6 x i8] c"false\00"
@.str.2 = [2 x i8] c"0\00"
@.str.3 = [4 x i8] c"yes\00"
@.str.4 = [5 x i8] c"true\00"
@.str.5 = [2 x i8] c"1\00"
define i32 @parse_boolean(i8* %0) {
%2 = alloca i32
%3 = alloca i8*
store i8* %0, i8** %3
%4 = load i8*, i8** %3
%5 = call i64 @strcasecmp(i8* %4, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0))
%6 = icmp eq i64 %5, 0
br i1 %6, label %15, label %7
7: ; preds = %1
%8 = load i8*, i8** %3
%9 = call i64 @strcasecmp(i8* %8, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0))
%10 = icmp eq i64 %9, 0
br i1 %10, label %15, label %11
11: ; preds = %7
%12 = load i8*, i8** %3
%13 = call i64 @strcmp(i8* %12, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0))
%14 = icmp eq i64 %13, 0
br i1 %14, label %15, label %16
15: ; preds = %11, %7, %1
store i32 0, i32* %2
br label %30
16: ; preds = %11
%17 = load i8*, i8** %3
%18 = call i64 @strcasecmp(i8* %17, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0))
%19 = icmp eq i64 %18, 0
br i1 %19, label %28, label %20
20: ; preds = %16
%21 = load i8*, i8** %3
%22 = call i64 @strcasecmp(i8* %21, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.4, i64 0, i64 0))
%23 = icmp eq i64 %22, 0
br i1 %23, label %28, label %24
24: ; preds = %20
%25 = load i8*, i8** %3
%26 = call i64 @strcmp(i8* %25, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.5, i64 0, i64 0))
%27 = icmp eq i64 %26, 0
br i1 %27, label %28, label %29
28: ; preds = %24, %20, %16
store i32 1, i32* %2
br label %30
29: ; preds = %24
store i32 -1, i32* %2
br label %30
30: ; preds = %29, %28, %15
%31 = load i32, i32* %2
ret i32 %31
}

LLVM IR (-O2):
@.str = [3 x i8] c"no\00"
@.str.1 = [6 x i8] c"false\00"
@.str.2 = [2 x i8] c"0\00"
@.str.3 = [4 x i8] c"yes\00"
@.str.4 = [5 x i8] c"true\00"
@.str.5 = [2 x i8] c"1\00"
define i32 @parse_boolean(i8* %0) {
%2 = tail call i64 @strcasecmp(i8* %0, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0))
%3 = icmp eq i64 %2, 0
br i1 %3, label %20, label %4
4: ; preds = %1
%5 = tail call i64 @strcasecmp(i8* %0, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0))
%6 = icmp eq i64 %5, 0
br i1 %6, label %20, label %7
7: ; preds = %4
%8 = tail call i64 @strcmp(i8* %0, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0))
%9 = icmp eq i64 %8, 0
br i1 %9, label %20, label %10
10: ; preds = %7
%11 = tail call i64 @strcasecmp(i8* %0, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0))
%12 = icmp eq i64 %11, 0
br i1 %12, label %20, label %13
13: ; preds = %10
%14 = tail call i64 @strcasecmp(i8* %0, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.4, i64 0, i64 0))
%15 = icmp eq i64 %14, 0
br i1 %15, label %20, label %16
16: ; preds = %13
%17 = tail call i64 @strcmp(i8* %0, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.5, i64 0, i64 0))
%18 = icmp eq i64 %17, 0
%19 = select i1 %18, i32 1, i32 -1
br label %20
20: ; preds = %16, %10, %13, %1, %4, %7
%21 = phi i32 [ 0, %7 ], [ 0, %4 ], [ 0, %1 ], [ 1, %13 ], [ 1, %10 ], [ %19, %16 ]
ret i32 %21
}