#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*/ strcasecmp(char const *, char *);
int /*<<< orphan*/ strcmp(char const *, char *);
int is_true(const char *val) {
  return !strcasecmp(val, "yes") || !strcasecmp(val, "true") ||
         !strcasecmp(val, "on") || !strcmp(val, "1");
}


x86 assembly (clang, -O0):
<is_true>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x8(%rbp)
mov    -0x8(%rbp),%rdi
lea    0xec9(%rip),%rsi
call   1030 <strcasecmp@plt>
mov    %eax,%ecx
mov    $0x1,%al
cmp    $0x0,%ecx
mov    %al,-0x9(%rbp)
je     11a7 <is_true+0x87>
mov    -0x8(%rbp),%rdi
lea    0xead(%rip),%rsi
call   1030 <strcasecmp@plt>
mov    %eax,%ecx
mov    $0x1,%al
cmp    $0x0,%ecx
mov    %al,-0x9(%rbp)
je     11a7 <is_true+0x87>
mov    -0x8(%rbp),%rdi
lea    0xe92(%rip),%rsi
call   1030 <strcasecmp@plt>
mov    %eax,%ecx
mov    $0x1,%al
cmp    $0x0,%ecx
mov    %al,-0x9(%rbp)
je     11a7 <is_true+0x87>
mov    -0x8(%rbp),%rdi
lea    0xe75(%rip),%rsi
call   1040 <strcmp@plt>
cmp    $0x0,%eax
setne  %al
xor    $0xff,%al
mov    %al,-0x9(%rbp)
mov    -0x9(%rbp),%al
and    $0x1,%al
movzbl %al,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<is_true>:
push   %rbp
push   %rbx
push   %rax
mov    %rdi,%rbx
lea    0xed3(%rip),%rsi
call   1030 <strcasecmp@plt>
mov    $0x1,%ebp
test   %eax,%eax
je     1178 <is_true+0x58>
lea    0xec2(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcasecmp@plt>
test   %eax,%eax
je     1178 <is_true+0x58>
lea    0xeb4(%rip),%rsi
mov    %rbx,%rdi
call   1030 <strcasecmp@plt>
test   %eax,%eax
je     1178 <is_true+0x58>
lea    0xea4(%rip),%rsi
mov    %rbx,%rdi
call   1040 <strcmp@plt>
xor    %ebp,%ebp
test   %eax,%eax
sete   %bpl
mov    %ebp,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
@.str = [4 x i8] c"yes\00"
@.str.1 = [5 x i8] c"true\00"
@.str.2 = [3 x i8] c"on\00"
@.str.3 = [2 x i8] c"1\00"
define i32 @is_true(i8* %0) {
%2 = alloca i8*
store i8* %0, i8** %2
%3 = load i8*, i8** %2
%4 = call i32 @strcasecmp(i8* %3, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0))
%5 = icmp ne i32 %4, 0
br i1 %5, label %6, label %19
6: ; preds = %1
%7 = load i8*, i8** %2
%8 = call i32 @strcasecmp(i8* %7, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.1, i64 0, i64 0))
%9 = icmp ne i32 %8, 0
br i1 %9, label %10, label %19
10: ; preds = %6
%11 = load i8*, i8** %2
%12 = call i32 @strcasecmp(i8* %11, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0))
%13 = icmp ne i32 %12, 0
br i1 %13, label %14, label %19
14: ; preds = %10
%15 = load i8*, i8** %2
%16 = call i32 @strcmp(i8* %15, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.3, i64 0, i64 0))
%17 = icmp ne i32 %16, 0
%18 = xor i1 %17, true
br label %19
19: ; preds = %14, %10, %6, %1
%20 = phi i1 [ true, %10 ], [ true, %6 ], [ true, %1 ], [ %18, %14 ]
%21 = zext i1 %20 to i32
ret i32 %21
}

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