#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__ strncmp(char *, char *, int);
int isref(char *cp) {
  if (strncmp(cp, "@ref{", 5) == 0)
    return 5;
  if (strncmp(cp, "@xref{", 6) == 0)
    return 6;
  if (strncmp(cp, "@pxref{", 7) == 0)
    return 7;
  return 0;
}


x86 assembly (clang, -O0):
<isref>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
lea    0xed9(%rip),%rsi
mov    $0x5,%edx
call   1030 <strncmp@plt>
cmp    $0x0,%rax
jne    1147 <isref+0x37>
movl   $0x5,-0x4(%rbp)
jmp    11a4 <isref+0x94>
mov    -0x10(%rbp),%rdi
lea    0xeb4(%rip),%rsi
mov    $0x6,%edx
call   1030 <strncmp@plt>
cmp    $0x0,%rax
jne    1172 <isref+0x62>
movl   $0x6,-0x4(%rbp)
jmp    11a4 <isref+0x94>
mov    -0x10(%rbp),%rdi
lea    0xe90(%rip),%rsi
mov    $0x7,%edx
call   1030 <strncmp@plt>
cmp    $0x0,%rax
jne    119d <isref+0x8d>
movl   $0x7,-0x4(%rbp)
jmp    11a4 <isref+0x94>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<isref>:
push   %rbp
push   %r14
push   %rbx
mov    %rdi,%rbx
lea    0xee2(%rip),%rsi
mov    $0x5,%ebp
mov    $0x5,%edx
call   1030 <strncmp@plt>
test   %rax,%rax
je     1173 <isref+0x63>
lea    0xecd(%rip),%rsi
mov    $0x6,%ebp
mov    %rbx,%rdi
mov    $0x6,%edx
call   1030 <strncmp@plt>
test   %rax,%rax
je     1173 <isref+0x63>
lea    0xeb6(%rip),%rsi
mov    $0x7,%r14d
mov    %rbx,%rdi
mov    $0x7,%edx
call   1030 <strncmp@plt>
xor    %ebp,%ebp
test   %rax,%rax
cmove  %r14d,%ebp
mov    %ebp,%eax
pop    %rbx
pop    %r14
pop    %rbp
ret

LLVM IR (-O0):
@.str = [6 x i8] c"@ref{\00"
@.str.1 = [7 x i8] c"@xref{\00"
@.str.2 = [8 x i8] c"@pxref{\00"
define i32 @isref(i8* %0) {
%2 = alloca i32
%3 = alloca i8*
store i8* %0, i8** %3
%4 = load i8*, i8** %3
%5 = call i64 @strncmp(i8* %4, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i32 5)
%6 = icmp eq i64 %5, 0
br i1 %6, label %7, label %8
7: ; preds = %1
store i32 5, i32* %2
br label %19
8: ; preds = %1
%9 = load i8*, i8** %3
%10 = call i64 @strncmp(i8* %9, i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.1, i64 0, i64 0), i32 6)
%11 = icmp eq i64 %10, 0
br i1 %11, label %12, label %13
12: ; preds = %8
store i32 6, i32* %2
br label %19
13: ; preds = %8
%14 = load i8*, i8** %3
%15 = call i64 @strncmp(i8* %14, i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0), i32 7)
%16 = icmp eq i64 %15, 0
br i1 %16, label %17, label %18
17: ; preds = %13
store i32 7, i32* %2
br label %19
18: ; preds = %13
store i32 0, i32* %2
br label %19
19: ; preds = %18, %17, %12, %7
%20 = load i32, i32* %2
ret i32 %20
}

LLVM IR (-O2):
@.str = [6 x i8] c"@ref{\00"
@.str.1 = [7 x i8] c"@xref{\00"
@.str.2 = [8 x i8] c"@pxref{\00"
define i32 @isref(i8* %0) {
%2 = tail call i64 @strncmp(i8* %0, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i32 5)
%3 = icmp eq i64 %2, 0
br i1 %3, label %11, label %4
4: ; preds = %1
%5 = tail call i64 @strncmp(i8* %0, i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.1, i64 0, i64 0), i32 6)
%6 = icmp eq i64 %5, 0
br i1 %6, label %11, label %7
7: ; preds = %4
%8 = tail call i64 @strncmp(i8* %0, i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0), i32 7)
%9 = icmp eq i64 %8, 0
%10 = select i1 %9, i32 7, i32 0
br label %11
11: ; preds = %7, %4, %1
%12 = phi i32 [ 5, %1 ], [ 6, %4 ], [ %10, %7 ]
ret i32 %12
}