#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 *, char const *);
scalar_t__ strcmp(char *, char const *);
int str2bool(const char *buf) {
  if (strcasecmp("TRUE", buf) == 0 || strcmp("1", buf) == 0 ||
      strcasecmp("Y", buf) == 0 || strcasecmp("YES", buf) == 0 ||
      strcasecmp("T", buf) == 0)
    return 1;
  if (strcasecmp("FALSE", buf) == 0 || strcmp("0", buf) == 0 ||
      strcasecmp("N", buf) == 0 || strcasecmp("NO", buf) == 0 ||
      strcasecmp("F", buf) == 0)
    return 0;
  return -1;
}


x86 assembly (clang, -O0):
<str2bool>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rsi
lea    0xec9(%rip),%rdi
call   1030 <strcasecmp@plt>
cmp    $0x0,%rax
je     11ae <str2bool+0x8e>
mov    -0x10(%rbp),%rsi
lea    0xeb4(%rip),%rdi
call   1040 <strcmp@plt>
cmp    $0x0,%rax
je     11ae <str2bool+0x8e>
mov    -0x10(%rbp),%rsi
lea    0xe9c(%rip),%rdi
call   1030 <strcasecmp@plt>
cmp    $0x0,%rax
je     11ae <str2bool+0x8e>
mov    -0x10(%rbp),%rsi
lea    0xe84(%rip),%rdi
call   1030 <strcasecmp@plt>
cmp    $0x0,%rax
je     11ae <str2bool+0x8e>
mov    -0x10(%rbp),%rsi
lea    0xe6e(%rip),%rdi
call   1030 <strcasecmp@plt>
cmp    $0x0,%rax
jne    11ba <str2bool+0x9a>
movl   $0x1,-0x4(%rbp)
jmp    124f <str2bool+0x12f>
mov    -0x10(%rbp),%rsi
lea    0xe4a(%rip),%rdi
call   1030 <strcasecmp@plt>
cmp    $0x0,%rax
je     123c <str2bool+0x11c>
mov    -0x10(%rbp),%rsi
lea    0xe36(%rip),%rdi
call   1040 <strcmp@plt>
cmp    $0x0,%rax
je     123c <str2bool+0x11c>
mov    -0x10(%rbp),%rsi
lea    0xe1e(%rip),%rdi
call   1030 <strcasecmp@plt>
cmp    $0x0,%rax
je     123c <str2bool+0x11c>
mov    -0x10(%rbp),%rsi
lea    0xe06(%rip),%rdi
call   1030 <strcasecmp@plt>
cmp    $0x0,%rax
je     123c <str2bool+0x11c>
mov    -0x10(%rbp),%rsi
lea    0xdef(%rip),%rdi
call   1030 <strcasecmp@plt>
cmp    $0x0,%rax
jne    1248 <str2bool+0x128>
movl   $0x0,-0x4(%rbp)
jmp    124f <str2bool+0x12f>
movl   $0xffffffff,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<str2bool>:
push   %rbp
push   %rbx
push   %rax
mov    %rdi,%rbx
lea    0xed3(%rip),%rdi
mov    %rbx,%rsi
call   1030 <strcasecmp@plt>
mov    $0x1,%ebp
test   %rax,%rax
je     1201 <str2bool+0xe1>
lea    0xebb(%rip),%rdi
mov    %rbx,%rsi
call   1040 <strcmp@plt>
test   %rax,%rax
je     1201 <str2bool+0xe1>
lea    0xea5(%rip),%rdi
mov    %rbx,%rsi
call   1030 <strcasecmp@plt>
test   %rax,%rax
je     1201 <str2bool+0xe1>
lea    0xe8f(%rip),%rdi
mov    %rbx,%rsi
call   1030 <strcasecmp@plt>
test   %rax,%rax
je     1201 <str2bool+0xe1>
lea    0xe7f(%rip),%rdi
mov    %rbx,%rsi
call   1030 <strcasecmp@plt>
test   %rax,%rax
je     1201 <str2bool+0xe1>
lea    0xe6d(%rip),%rdi
mov    %rbx,%rsi
call   1030 <strcasecmp@plt>
xor    %ebp,%ebp
test   %rax,%rax
je     1201 <str2bool+0xe1>
lea    0xe5d(%rip),%rdi
mov    %rbx,%rsi
call   1040 <strcmp@plt>
test   %rax,%rax
je     1201 <str2bool+0xe1>
lea    0xe4b(%rip),%rdi
mov    %rbx,%rsi
call   1030 <strcasecmp@plt>
test   %rax,%rax
je     1201 <str2bool+0xe1>
lea    0xe39(%rip),%rdi
mov    %rbx,%rsi
call   1030 <strcasecmp@plt>
test   %rax,%rax
je     1201 <str2bool+0xe1>
lea    0xe28(%rip),%rdi
mov    %rbx,%rsi
call   1030 <strcasecmp@plt>
neg    %rax
sbb    %ebp,%ebp
mov    %ebp,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
@.str = [5 x i8] c"TRUE\00"
@.str.1 = [2 x i8] c"1\00"
@.str.2 = [2 x i8] c"Y\00"
@.str.3 = [4 x i8] c"YES\00"
@.str.4 = [2 x i8] c"T\00"
@.str.5 = [6 x i8] c"FALSE\00"
@.str.6 = [2 x i8] c"0\00"
@.str.7 = [2 x i8] c"N\00"
@.str.8 = [3 x i8] c"NO\00"
@.str.9 = [2 x i8] c"F\00"
define i32 @str2bool(i8* %0) {
%2 = alloca i32
%3 = alloca i8*
store i8* %0, i8** %3
%4 = load i8*, i8** %3
%5 = call i64 @strcasecmp(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* %4)
%6 = icmp eq i64 %5, 0
br i1 %6, label %23, label %7
7: ; preds = %1
%8 = load i8*, i8** %3
%9 = call i64 @strcmp(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0), i8* %8)
%10 = icmp eq i64 %9, 0
br i1 %10, label %23, label %11
11: ; preds = %7
%12 = load i8*, i8** %3
%13 = call i64 @strcasecmp(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0), i8* %12)
%14 = icmp eq i64 %13, 0
br i1 %14, label %23, label %15
15: ; preds = %11
%16 = load i8*, i8** %3
%17 = call i64 @strcasecmp(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i8* %16)
%18 = icmp eq i64 %17, 0
br i1 %18, label %23, label %19
19: ; preds = %15
%20 = load i8*, i8** %3
%21 = call i64 @strcasecmp(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.4, i64 0, i64 0), i8* %20)
%22 = icmp eq i64 %21, 0
br i1 %22, label %23, label %24
23: ; preds = %19, %15, %11, %7, %1
store i32 1, i32* %2
br label %46
24: ; preds = %19
%25 = load i8*, i8** %3
%26 = call i64 @strcasecmp(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.5, i64 0, i64 0), i8* %25)
%27 = icmp eq i64 %26, 0
br i1 %27, label %44, label %28
28: ; preds = %24
%29 = load i8*, i8** %3
%30 = call i64 @strcmp(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.6, i64 0, i64 0), i8* %29)
%31 = icmp eq i64 %30, 0
br i1 %31, label %44, label %32
32: ; preds = %28
%33 = load i8*, i8** %3
%34 = call i64 @strcasecmp(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.7, i64 0, i64 0), i8* %33)
%35 = icmp eq i64 %34, 0
br i1 %35, label %44, label %36
36: ; preds = %32
%37 = load i8*, i8** %3
%38 = call i64 @strcasecmp(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.8, i64 0, i64 0), i8* %37)
%39 = icmp eq i64 %38, 0
br i1 %39, label %44, label %40
40: ; preds = %36
%41 = load i8*, i8** %3
%42 = call i64 @strcasecmp(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.9, i64 0, i64 0), i8* %41)
%43 = icmp eq i64 %42, 0
br i1 %43, label %44, label %45
44: ; preds = %40, %36, %32, %28, %24
store i32 0, i32* %2
br label %46
45: ; preds = %40
store i32 -1, i32* %2
br label %46
46: ; preds = %45, %44, %23
%47 = load i32, i32* %2
ret i32 %47
}

LLVM IR (-O2):
@.str = [5 x i8] c"TRUE\00"
@.str.1 = [2 x i8] c"1\00"
@.str.2 = [2 x i8] c"Y\00"
@.str.3 = [4 x i8] c"YES\00"
@.str.4 = [2 x i8] c"T\00"
@.str.5 = [6 x i8] c"FALSE\00"
@.str.6 = [2 x i8] c"0\00"
@.str.7 = [2 x i8] c"N\00"
@.str.8 = [3 x i8] c"NO\00"
@.str.9 = [2 x i8] c"F\00"
define i32 @str2bool(i8* %0) {
%2 = tail call i64 @strcasecmp(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* %0)
%3 = icmp eq i64 %2, 0
br i1 %3, label %32, label %4
4: ; preds = %1
%5 = tail call i64 @strcmp(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0), i8* %0)
%6 = icmp eq i64 %5, 0
br i1 %6, label %32, label %7
7: ; preds = %4
%8 = tail call i64 @strcasecmp(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0), i8* %0)
%9 = icmp eq i64 %8, 0
br i1 %9, label %32, label %10
10: ; preds = %7
%11 = tail call i64 @strcasecmp(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.3, i64 0, i64 0), i8* %0)
%12 = icmp eq i64 %11, 0
br i1 %12, label %32, label %13
13: ; preds = %10
%14 = tail call i64 @strcasecmp(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.4, i64 0, i64 0), i8* %0)
%15 = icmp eq i64 %14, 0
br i1 %15, label %32, label %16
16: ; preds = %13
%17 = tail call i64 @strcasecmp(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.5, i64 0, i64 0), i8* %0)
%18 = icmp eq i64 %17, 0
br i1 %18, label %32, label %19
19: ; preds = %16
%20 = tail call i64 @strcmp(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.6, i64 0, i64 0), i8* %0)
%21 = icmp eq i64 %20, 0
br i1 %21, label %32, label %22
22: ; preds = %19
%23 = tail call i64 @strcasecmp(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.7, i64 0, i64 0), i8* %0)
%24 = icmp eq i64 %23, 0
br i1 %24, label %32, label %25
25: ; preds = %22
%26 = tail call i64 @strcasecmp(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.8, i64 0, i64 0), i8* %0)
%27 = icmp eq i64 %26, 0
br i1 %27, label %32, label %28
28: ; preds = %25
%29 = tail call i64 @strcasecmp(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.9, i64 0, i64 0), i8* %0)
%30 = icmp ne i64 %29, 0
%31 = sext i1 %30 to i32
br label %32
32: ; preds = %28, %16, %19, %22, %25, %1, %4, %7, %10, %13
%33 = phi i32 [ 1, %13 ], [ 1, %10 ], [ 1, %7 ], [ 1, %4 ], [ 1, %1 ], [ 0, %25 ], [ 0, %22 ], [ 0, %19 ], [ 0, %16 ], [ %31, %28 ]
ret i32 %33
}