#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__ strcmp(char const *, char *);
int is_true(const char *str) {
  if (str && (strcmp(str, "On") == 0 || strcmp(str, "on") == 0 ||
              strcmp(str, "true") == 0 || strcmp(str, "True") == 0 ||
              strcmp(str, "1") == 0))
    return 1;
  else
    return 0;
}


x86 assembly (clang, -O0):
<is_true>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x10(%rbp)
cmpq   $0x0,-0x10(%rbp)
je     11b5 <is_true+0xa5>
mov    -0x10(%rbp),%rdi
lea    0xece(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%rax
je     11a9 <is_true+0x99>
mov    -0x10(%rbp),%rdi
lea    0xeb7(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%rax
je     11a9 <is_true+0x99>
mov    -0x10(%rbp),%rdi
lea    0xea0(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%rax
je     11a9 <is_true+0x99>
mov    -0x10(%rbp),%rdi
lea    0xe8b(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%rax
je     11a9 <is_true+0x99>
mov    -0x10(%rbp),%rdi
lea    0xe76(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%rax
jne    11b5 <is_true+0xa5>
movl   $0x1,-0x4(%rbp)
jmp    11bc <is_true+0xac>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<is_true>:
push   %rbp
push   %rbx
push   %rax
test   %rdi,%rdi
je     1181 <is_true+0x71>
mov    %rdi,%rbx
lea    0xede(%rip),%rsi
call   1030 <strcmp@plt>
mov    $0x1,%ebp
test   %rax,%rax
je     1183 <is_true+0x73>
lea    0xecb(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcmp@plt>
test   %rax,%rax
je     1183 <is_true+0x73>
lea    0xeba(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcmp@plt>
test   %rax,%rax
je     1183 <is_true+0x73>
lea    0xeab(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcmp@plt>
test   %rax,%rax
je     1183 <is_true+0x73>
lea    0xe9c(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcmp@plt>
test   %rax,%rax
je     1183 <is_true+0x73>
xor    %ebp,%ebp
mov    %ebp,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
@.str = [3 x i8] c"On\00"
@.str.1 = [3 x i8] c"on\00"
@.str.2 = [5 x i8] c"true\00"
@.str.3 = [5 x i8] c"True\00"
@.str.4 = [2 x i8] c"1\00"
define i32 @is_true(i8* %0) {
%2 = alloca i32
%3 = alloca i8*
store i8* %0, i8** %3
%4 = load i8*, i8** %3
%5 = icmp ne i8* %4, null
br i1 %5, label %6, label %27
6: ; preds = %1
%7 = load i8*, i8** %3
%8 = call i64 @strcmp(i8* %7, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0))
%9 = icmp eq i64 %8, 0
br i1 %9, label %26, label %10
10: ; preds = %6
%11 = load i8*, i8** %3
%12 = call i64 @strcmp(i8* %11, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0))
%13 = icmp eq i64 %12, 0
br i1 %13, label %26, label %14
14: ; preds = %10
%15 = load i8*, i8** %3
%16 = call i64 @strcmp(i8* %15, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.2, i64 0, i64 0))
%17 = icmp eq i64 %16, 0
br i1 %17, label %26, label %18
18: ; preds = %14
%19 = load i8*, i8** %3
%20 = call i64 @strcmp(i8* %19, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.3, i64 0, i64 0))
%21 = icmp eq i64 %20, 0
br i1 %21, label %26, label %22
22: ; preds = %18
%23 = load i8*, i8** %3
%24 = call i64 @strcmp(i8* %23, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.4, i64 0, i64 0))
%25 = icmp eq i64 %24, 0
br i1 %25, label %26, label %27
26: ; preds = %22, %18, %14, %10, %6
store i32 1, i32* %2
br label %28
27: ; preds = %22, %1
store i32 0, i32* %2
br label %28
28: ; preds = %27, %26
%29 = load i32, i32* %2
ret i32 %29
}

LLVM IR (-O2):
@.str = [3 x i8] c"On\00"
@.str.1 = [3 x i8] c"on\00"
@.str.2 = [5 x i8] c"true\00"
@.str.3 = [5 x i8] c"True\00"
@.str.4 = [2 x i8] c"1\00"
define i32 @is_true(i8* %0) {
%2 = icmp eq i8* %0, null
br i1 %2, label %18, label %3
3: ; preds = %1
%4 = tail call i64 @strcmp(i8* %0, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0))
%5 = icmp eq i64 %4, 0
br i1 %5, label %19, label %6
6: ; preds = %3
%7 = tail call i64 @strcmp(i8* %0, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0))
%8 = icmp eq i64 %7, 0
br i1 %8, label %19, label %9
9: ; preds = %6
%10 = tail call i64 @strcmp(i8* %0, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.2, i64 0, i64 0))
%11 = icmp eq i64 %10, 0
br i1 %11, label %19, label %12
12: ; preds = %9
%13 = tail call i64 @strcmp(i8* %0, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.3, i64 0, i64 0))
%14 = icmp eq i64 %13, 0
br i1 %14, label %19, label %15
15: ; preds = %12
%16 = tail call i64 @strcmp(i8* %0, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.4, i64 0, i64 0))
%17 = icmp eq i64 %16, 0
br i1 %17, label %19, label %18
18: ; preds = %15, %1
br label %19
19: ; preds = %3, %6, %9, %12, %15, %18
%20 = phi i32 [ 0, %18 ], [ 1, %15 ], [ 1, %12 ], [ 1, %9 ], [ 1, %6 ], [ 1, %3 ]
ret i32 %20
}