#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 strlen(char *);
int parse_background(char *cmd) {
  int i;
  for (i = 0; i < strlen(cmd); i++)
    if (cmd[i] == '&') {
      cmd[i] = ' ';
      return 1;
    }
  return 0;
}


x86 assembly (clang, -O0):
<parse_background>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
movl   $0x0,-0x14(%rbp)
mov    -0x14(%rbp),%eax
mov    %eax,-0x18(%rbp)
mov    -0x10(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,%ecx
mov    -0x18(%rbp),%eax
cmp    %ecx,%eax
jge    117f <parse_background+0x6f>
mov    -0x10(%rbp),%rax
movslq -0x14(%rbp),%rcx
movsbl (%rax,%rcx,1),%eax
cmp    $0x26,%eax
jne    116c <parse_background+0x5c>
mov    -0x10(%rbp),%rax
movslq -0x14(%rbp),%rcx
movb   $0x20,(%rax,%rcx,1)
movl   $0x1,-0x4(%rbp)
jmp    1186 <parse_background+0x76>
jmp    1171 <parse_background+0x61>
mov    -0x14(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
jmp    1123 <parse_background+0x13>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<parse_background>:
push   %r14
push   %rbx
push   %rax
mov    %rdi,%r14
call   1030 <strlen@plt>
test   %eax,%eax
jle    114a <parse_background+0x3a>
xor    %ebx,%ebx
cs nopw 0x0(%rax,%rax,1)
nopl   0x0(%rax)
cmpb   $0x26,(%r14,%rbx,1)
je     114e <parse_background+0x3e>
add    $0x1,%rbx
mov    %r14,%rdi
call   1030 <strlen@plt>
cltq
cmp    %rax,%rbx
jl     1130 <parse_background+0x20>
xor    %eax,%eax
jmp    1158 <parse_background+0x48>
movb   $0x20,(%r14,%rbx,1)
mov    $0x1,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
define i32 @parse_background(i8* %0) {
%2 = alloca i32
%3 = alloca i8*
%4 = alloca i32
store i8* %0, i8** %3
store i32 0, i32* %4
br label %5
5: ; preds = %24, %1
%6 = load i32, i32* %4
%7 = load i8*, i8** %3
%8 = call i32 @strlen(i8* %7)
%9 = icmp slt i32 %6, %8
br i1 %9, label %10, label %27
10: ; preds = %5
%11 = load i8*, i8** %3
%12 = load i32, i32* %4
%13 = sext i32 %12 to i64
%14 = getelementptr inbounds i8, i8* %11, i64 %13
%15 = load i8, i8* %14
%16 = sext i8 %15 to i32
%17 = icmp eq i32 %16, 38
br i1 %17, label %18, label %23
18: ; preds = %10
%19 = load i8*, i8** %3
%20 = load i32, i32* %4
%21 = sext i32 %20 to i64
%22 = getelementptr inbounds i8, i8* %19, i64 %21
store i8 32, i8* %22
store i32 1, i32* %2
br label %28
23: ; preds = %10
br label %24
24: ; preds = %23
%25 = load i32, i32* %4
%26 = add nsw i32 %25, 1
store i32 %26, i32* %4
br label %5
27: ; preds = %5
store i32 0, i32* %2
br label %28
28: ; preds = %27, %18
%29 = load i32, i32* %2
ret i32 %29
}

LLVM IR (-O2):
define i32 @parse_background(i8* %0) {
%2 = tail call i32 @strlen(i8* %0)
%3 = icmp sgt i32 %2, 0
br i1 %3, label %4, label %17
4: ; preds = %1, %12
%5 = phi i64 [ %13, %12 ], [ 0, %1 ]
%6 = getelementptr inbounds i8, i8* %0, i64 %5
%7 = load i8, i8* %6
%8 = icmp eq i8 %7, 38
br i1 %8, label %9, label %12
9: ; preds = %4
%10 = and i64 %5, 4294967295
%11 = getelementptr inbounds i8, i8* %0, i64 %10
store i8 32, i8* %11
br label %17
12: ; preds = %4
%13 = add nuw nsw i64 %5, 1
%14 = tail call i32 @strlen(i8* %0)
%15 = sext i32 %14 to i64
%16 = icmp slt i64 %13, %15
br i1 %16, label %4, label %17
17: ; preds = %12, %1, %9
%18 = phi i32 [ 1, %9 ], [ 0, %1 ], [ 0, %12 ]
ret i32 %18
}