#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 *, char *);
int separator(int argc, char **argv) {
  for (int i = 1; i < argc; ++i)
    if (strcmp("--", argv[i]) == 0)
      return i;
  return -1;
}


x86 assembly (clang, -O0):
<separator>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
movl   $0x1,-0x14(%rbp)
mov    -0x14(%rbp),%eax
cmp    -0x8(%rbp),%eax
jge    1172 <separator+0x62>
mov    -0x10(%rbp),%rax
movslq -0x14(%rbp),%rcx
mov    (%rax,%rcx,8),%rsi
lea    0xebb(%rip),%rdi
call   1030 <strcmp@plt>
cmp    $0x0,%rax
jne    115f <separator+0x4f>
mov    -0x14(%rbp),%eax
mov    %eax,-0x4(%rbp)
jmp    1179 <separator+0x69>
jmp    1164 <separator+0x54>
mov    -0x14(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
jmp    1126 <separator+0x16>
movl   $0xffffffff,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<separator>:
push   %rbp
push   %r15
push   %r14
push   %r12
push   %rbx
mov    $0xffffffff,%r14d
cmp    $0x2,%edi
jl     115f <separator+0x4f>
mov    %rsi,%r12
mov    %edi,%ebx
mov    $0x1,%ebp
lea    0xecc(%rip),%r15
cs nopw 0x0(%rax,%rax,1)
xchg   %ax,%ax
mov    (%r12,%rbp,8),%rsi
mov    %r15,%rdi
call   1030 <strcmp@plt>
test   %rax,%rax
je     115c <separator+0x4c>
add    $0x1,%rbp
cmp    %rbp,%rbx
jne    1140 <separator+0x30>
jmp    115f <separator+0x4f>
mov    %ebp,%r14d
mov    %r14d,%eax
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
pop    %rbp
ret

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

LLVM IR (-O2):
@.str = [3 x i8] c"--\00"
define i32 @separator(i32 %0, i8** nocapture %1) {
%3 = icmp sgt i32 %0, 1
br i1 %3, label %4, label %17
4: ; preds = %2
%5 = zext i32 %0 to i64
br label %6
6: ; preds = %4, %12
%7 = phi i64 [ 1, %4 ], [ %13, %12 ]
%8 = getelementptr inbounds i8*, i8** %1, i64 %7
%9 = load i8*, i8** %8
%10 = tail call i64 @strcmp(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i8* %9)
%11 = icmp eq i64 %10, 0
br i1 %11, label %15, label %12
12: ; preds = %6
%13 = add nuw nsw i64 %7, 1
%14 = icmp eq i64 %13, %5
br i1 %14, label %17, label %6
15: ; preds = %6
%16 = trunc i64 %7 to i32
br label %17
17: ; preds = %12, %15, %2
%18 = phi i32 [ -1, %2 ], [ %16, %15 ], [ -1, %12 ]
ret i32 %18
}