#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 validate_bool(const char *str) {
  if (!str)
    return 0;
  if (strcmp(str, "true") == 0)
    return 1;
  else if (strcmp(str, "false") == 0)
    return 1;
  return 0;
}


x86 assembly (clang, -O0):
<validate_bool>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x10(%rbp)
cmpq   $0x0,-0x10(%rbp)
jne    1133 <validate_bool+0x23>
movl   $0x0,-0x4(%rbp)
jmp    118b <validate_bool+0x7b>
mov    -0x10(%rbp),%rdi
lea    0xec2(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%rax
jne    1159 <validate_bool+0x49>
movl   $0x1,-0x4(%rbp)
jmp    118b <validate_bool+0x7b>
mov    -0x10(%rbp),%rdi
lea    0xea1(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%rax
jne    117f <validate_bool+0x6f>
movl   $0x1,-0x4(%rbp)
jmp    118b <validate_bool+0x7b>
jmp    1184 <validate_bool+0x74>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<validate_bool>:
push   %rbx
test   %rdi,%rdi
je     1146 <validate_bool+0x36>
mov    %rdi,%rbx
lea    0xee0(%rip),%rsi
call   1030 <strcmp@plt>
test   %rax,%rax
je     114a <validate_bool+0x3a>
lea    0xed4(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcmp@plt>
mov    %rax,%rcx
xor    %eax,%eax
test   %rcx,%rcx
sete   %al
pop    %rbx
ret
xor    %eax,%eax
pop    %rbx
ret
mov    $0x1,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [5 x i8] c"true\00"
@.str.1 = [6 x i8] c"false\00"
define i32 @validate_bool(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 %7, label %6
6: ; preds = %1
store i32 0, i32* %2
br label %19
7: ; preds = %1
%8 = load i8*, i8** %3
%9 = call i64 @strcmp(i8* %8, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0))
%10 = icmp eq i64 %9, 0
br i1 %10, label %11, label %12
11: ; preds = %7
store i32 1, i32* %2
br label %19
12: ; preds = %7
%13 = load i8*, i8** %3
%14 = call i64 @strcmp(i8* %13, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0))
%15 = icmp eq i64 %14, 0
br i1 %15, label %16, label %17
16: ; preds = %12
store i32 1, i32* %2
br label %19
17: ; preds = %12
br label %18
18: ; preds = %17
store i32 0, i32* %2
br label %19
19: ; preds = %18, %16, %11, %6
%20 = load i32, i32* %2
ret i32 %20
}

LLVM IR (-O2):
@.str = [5 x i8] c"true\00"
@.str.1 = [6 x i8] c"false\00"
define i32 @validate_bool(i8* %0) {
%2 = icmp eq i8* %0, null
br i1 %2, label %10, label %3
3: ; preds = %1
%4 = tail call i64 @strcmp(i8* %0, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0))
%5 = icmp eq i64 %4, 0
br i1 %5, label %10, label %6
6: ; preds = %3
%7 = tail call i64 @strcmp(i8* %0, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0))
%8 = icmp eq i64 %7, 0
%9 = zext i1 %8 to i32
br label %10
10: ; preds = %6, %3, %1
%11 = phi i32 [ 0, %1 ], [ 1, %3 ], [ %9, %6 ]
ret i32 %11
}