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


x86 assembly (clang, -O0):
<scan_for_o>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %edi,-0xc(%rbp)
mov    %rsi,-0x18(%rbp)
movl   $0x0,-0x1c(%rbp)
mov    -0x1c(%rbp),%eax
cmp    -0xc(%rbp),%eax
jge    1181 <scan_for_o+0x71>
mov    -0x18(%rbp),%rax
movslq -0x1c(%rbp),%rcx
mov    (%rax,%rcx,8),%rdi
lea    0xebb(%rip),%rsi
call   1030 <strcmp@plt>
cmp    $0x0,%rax
jne    116e <scan_for_o+0x5e>
mov    -0x18(%rbp),%rax
mov    -0x1c(%rbp),%ecx
add    $0x1,%ecx
movslq %ecx,%rcx
mov    (%rax,%rcx,8),%rax
mov    %rax,-0x8(%rbp)
jmp    1181 <scan_for_o+0x71>
jmp    1173 <scan_for_o+0x63>
mov    -0x1c(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x1c(%rbp)
jmp    1126 <scan_for_o+0x16>
mov    -0x8(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<scan_for_o>:
push   %r15
push   %r14
push   %r12
push   %rbx
push   %rax
test   %edi,%edi
jle    114c <scan_for_o+0x3c>
mov    %rsi,%r15
mov    %edi,%r12d
xor    %ebx,%ebx
lea    0xed5(%rip),%r14
nopl   0x0(%rax,%rax,1)
mov    (%r15,%rbx,8),%rdi
mov    %r14,%rsi
call   1030 <strcmp@plt>
test   %rax,%rax
je     114e <scan_for_o+0x3e>
add    $0x1,%rbx
cmp    %rbx,%r12
jne    1130 <scan_for_o+0x20>
jmp    1153 <scan_for_o+0x43>
jmp    1153 <scan_for_o+0x43>
mov    0x8(%r15,%rbx,8),%rax
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [3 x i8] c"-o\00"
define i8* @scan_for_o(i32 %0, i8** %1) {
%3 = alloca i8*
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
store i32 %0, i32* %4
store i8** %1, i8*** %5
store i32 0, i32* %6
br label %7
7: ; preds = %27, %2
%8 = load i32, i32* %6
%9 = load i32, i32* %4
%10 = icmp slt i32 %8, %9
br i1 %10, label %11, label %30
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* %16, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0))
%18 = icmp eq i64 %17, 0
br i1 %18, label %19, label %26
19: ; preds = %11
%20 = load i8**, i8*** %5
%21 = load i32, i32* %6
%22 = add nsw i32 %21, 1
%23 = sext i32 %22 to i64
%24 = getelementptr inbounds i8*, i8** %20, i64 %23
%25 = load i8*, i8** %24
store i8* %25, i8** %3
br label %30
26: ; preds = %11
br label %27
27: ; preds = %26
%28 = load i32, i32* %6
%29 = add nsw i32 %28, 1
store i32 %29, i32* %6
br label %7
30: ; preds = %19, %7
%31 = load i8*, i8** %3
ret i8* %31
}

LLVM IR (-O2):
@.str = [3 x i8] c"-o\00"
define i8* @scan_for_o(i32 %0, i8** nocapture %1) {
%3 = icmp sgt i32 %0, 0
br i1 %3, label %4, label %19
4: ; preds = %2
%5 = zext i32 %0 to i64
br label %6
6: ; preds = %4, %17
%7 = phi i64 [ 0, %4 ], [ %12, %17 ]
%8 = getelementptr inbounds i8*, i8** %1, i64 %7
%9 = load i8*, i8** %8
%10 = tail call i64 @strcmp(i8* %9, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0))
%11 = icmp eq i64 %10, 0
%12 = add nuw i64 %7, 1
br i1 %11, label %13, label %17
13: ; preds = %6
%14 = and i64 %12, 4294967295
%15 = getelementptr inbounds i8*, i8** %1, i64 %14
%16 = load i8*, i8** %15
br label %19
17: ; preds = %6
%18 = icmp eq i64 %12, %5
br i1 %18, label %19, label %6
19: ; preds = %17, %2, %13
%20 = phi i8* [ %16, %13 ], [ undef, %2 ], [ undef, %17 ]
ret i8* %20
}