#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__ string_pattern(char *, char *, int /*<<< orphan*/);
int is_doi(char *s) {
  if (string_pattern(s, "##.####/", 0))
    return 0;
  if (string_pattern(s, "doi:##.####/", 0))
    return 4;
  if (string_pattern(s, "doi: ##.####/", 0))
    return 5;
  if (string_pattern(s, "doi: DOI: ##.####/", 0))
    return 10;
  if (string_pattern(s, "https://doi.org/##.####/", 0))
    return 16;
  return -1;
}


x86 assembly (clang, -O0):
<is_doi>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
lea    0xefe(%rip),%rsi
xor    %edx,%edx
call   1030 <string_pattern@plt>
cmp    $0x0,%rax
je     1144 <is_doi+0x34>
movl   $0x0,-0x4(%rbp)
jmp    11eb <is_doi+0xdb>
mov    -0x10(%rbp),%rdi
lea    0xeb1(%rip),%rsi
xor    %edx,%edx
call   1030 <string_pattern@plt>
cmp    $0x0,%rax
je     116c <is_doi+0x5c>
movl   $0x4,-0x4(%rbp)
jmp    11eb <is_doi+0xdb>
mov    -0x10(%rbp),%rdi
lea    0xe96(%rip),%rsi
xor    %edx,%edx
call   1030 <string_pattern@plt>
cmp    $0x0,%rax
je     1194 <is_doi+0x84>
movl   $0x5,-0x4(%rbp)
jmp    11eb <is_doi+0xdb>
mov    -0x10(%rbp),%rdi
lea    0xe7c(%rip),%rsi
xor    %edx,%edx
call   1030 <string_pattern@plt>
cmp    $0x0,%rax
je     11bc <is_doi+0xac>
movl   $0xa,-0x4(%rbp)
jmp    11eb <is_doi+0xdb>
mov    -0x10(%rbp),%rdi
lea    0xe67(%rip),%rsi
xor    %edx,%edx
call   1030 <string_pattern@plt>
cmp    $0x0,%rax
je     11e4 <is_doi+0xd4>
movl   $0x10,-0x4(%rbp)
jmp    11eb <is_doi+0xdb>
movl   $0xffffffff,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<is_doi>:
push   %rbp
push   %rbx
push   %rax
mov    %rdi,%rbx
lea    0xf08(%rip),%rsi
xor    %ebp,%ebp
xor    %edx,%edx
call   1030 <string_pattern@plt>
test   %rax,%rax
jne    1196 <is_doi+0x86>
lea    0xece(%rip),%rsi
mov    %rbx,%rdi
xor    %edx,%edx
call   1030 <string_pattern@plt>
mov    $0x4,%ebp
test   %rax,%rax
jne    1196 <is_doi+0x86>
lea    0xec0(%rip),%rsi
mov    %rbx,%rdi
xor    %edx,%edx
call   1030 <string_pattern@plt>
mov    $0x5,%ebp
test   %rax,%rax
jne    1196 <is_doi+0x86>
lea    0xeb3(%rip),%rsi
mov    %rbx,%rdi
xor    %edx,%edx
call   1030 <string_pattern@plt>
mov    $0xa,%ebp
test   %rax,%rax
jne    1196 <is_doi+0x86>
lea    0xeab(%rip),%rsi
mov    %rbx,%rdi
xor    %edx,%edx
call   1030 <string_pattern@plt>
cmp    $0x1,%rax
sbb    %ebp,%ebp
or     $0x10,%ebp
mov    %ebp,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
@.str = [9 x i8] c"##.####/\00"
@.str.1 = [13 x i8] c"doi:##.####/\00"
@.str.2 = [14 x i8] c"doi: ##.####/\00"
@.str.3 = [19 x i8] c"doi: DOI: ##.####/\00"
@.str.4 = [25 x i8] c"https://doi.org/##.####/\00"
define i32 @is_doi(i8* %0) {
%2 = alloca i32
%3 = alloca i8*
store i8* %0, i8** %3
%4 = load i8*, i8** %3
%5 = call i64 @string_pattern(i8* %4, i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i64 0, i64 0), i32 0)
%6 = icmp ne i64 %5, 0
br i1 %6, label %7, label %8
7: ; preds = %1
store i32 0, i32* %2
br label %29
8: ; preds = %1
%9 = load i8*, i8** %3
%10 = call i64 @string_pattern(i8* %9, i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.1, i64 0, i64 0), i32 0)
%11 = icmp ne i64 %10, 0
br i1 %11, label %12, label %13
12: ; preds = %8
store i32 4, i32* %2
br label %29
13: ; preds = %8
%14 = load i8*, i8** %3
%15 = call i64 @string_pattern(i8* %14, i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.2, i64 0, i64 0), i32 0)
%16 = icmp ne i64 %15, 0
br i1 %16, label %17, label %18
17: ; preds = %13
store i32 5, i32* %2
br label %29
18: ; preds = %13
%19 = load i8*, i8** %3
%20 = call i64 @string_pattern(i8* %19, i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.3, i64 0, i64 0), i32 0)
%21 = icmp ne i64 %20, 0
br i1 %21, label %22, label %23
22: ; preds = %18
store i32 10, i32* %2
br label %29
23: ; preds = %18
%24 = load i8*, i8** %3
%25 = call i64 @string_pattern(i8* %24, i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.4, i64 0, i64 0), i32 0)
%26 = icmp ne i64 %25, 0
br i1 %26, label %27, label %28
27: ; preds = %23
store i32 16, i32* %2
br label %29
28: ; preds = %23
store i32 -1, i32* %2
br label %29
29: ; preds = %28, %27, %22, %17, %12, %7
%30 = load i32, i32* %2
ret i32 %30
}

LLVM IR (-O2):
@.str = [9 x i8] c"##.####/\00"
@.str.1 = [13 x i8] c"doi:##.####/\00"
@.str.2 = [14 x i8] c"doi: ##.####/\00"
@.str.3 = [19 x i8] c"doi: DOI: ##.####/\00"
@.str.4 = [25 x i8] c"https://doi.org/##.####/\00"
define i32 @is_doi(i8* %0) {
%2 = tail call i64 @string_pattern(i8* %0, i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i64 0, i64 0), i32 0)
%3 = icmp eq i64 %2, 0
br i1 %3, label %4, label %17
4: ; preds = %1
%5 = tail call i64 @string_pattern(i8* %0, i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.1, i64 0, i64 0), i32 0)
%6 = icmp eq i64 %5, 0
br i1 %6, label %7, label %17
7: ; preds = %4
%8 = tail call i64 @string_pattern(i8* %0, i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.2, i64 0, i64 0), i32 0)
%9 = icmp eq i64 %8, 0
br i1 %9, label %10, label %17
10: ; preds = %7
%11 = tail call i64 @string_pattern(i8* %0, i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.3, i64 0, i64 0), i32 0)
%12 = icmp eq i64 %11, 0
br i1 %12, label %13, label %17
13: ; preds = %10
%14 = tail call i64 @string_pattern(i8* %0, i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.4, i64 0, i64 0), i32 0)
%15 = icmp eq i64 %14, 0
%16 = select i1 %15, i32 -1, i32 16
br label %17
17: ; preds = %13, %10, %7, %4, %1
%18 = phi i32 [ 0, %1 ], [ 4, %4 ], [ 5, %7 ], [ 10, %10 ], [ %16, %13 ]
ret i32 %18
}