#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__ chdir(char *);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *);
int /*<<< orphan*/ perror(char *);
int /*<<< orphan*/ stderr;
int mysh_cd(char **args) {
  if (args[1] == (char *)NULL) {
    fprintf(stderr, "cd: need at least one argument\n");
  } else {
    if (chdir(args[1]) < 0) {
      perror("Unable to change directory:");
    }
  }
  return 1;
}


x86 assembly (clang, -O0):
<mysh_cd>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x8(%rbp)
mov    -0x8(%rbp),%rax
cmpq   $0x0,0x8(%rax)
jne    1165 <mysh_cd+0x35>
mov    0x2e8e(%rip),%rax
mov    (%rax),%edi
lea    0xea5(%rip),%rsi
call   1040 <fprintf@plt>
jmp    118d <mysh_cd+0x5d>
mov    -0x8(%rbp),%rax
mov    0x8(%rax),%rdi
call   1030 <chdir@plt>
cmp    $0x0,%rax
jge    1188 <mysh_cd+0x58>
lea    0xe9d(%rip),%rdi
call   1050 <perror@plt>
jmp    118d <mysh_cd+0x5d>
mov    $0x1,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<mysh_cd>:
push   %rax
mov    0x8(%rdi),%rdi
test   %rdi,%rdi
je     1152 <mysh_cd+0x22>
call   1030 <chdir@plt>
test   %rax,%rax
jns    1167 <mysh_cd+0x37>
lea    0xed5(%rip),%rdi
call   1050 <perror@plt>
jmp    1167 <mysh_cd+0x37>
mov    0x2e87(%rip),%rax
mov    (%rax),%edi
lea    0xe9e(%rip),%rsi
call   1040 <fprintf@plt>
mov    $0x1,%eax
pop    %rcx
ret

LLVM IR (-O0):
@stderr = global i32 0
@.str = [32 x i8] c"cd: need at least one argument\0A\00"
@.str.1 = [28 x i8] c"Unable to change directory:\00"
define i32 @mysh_cd(i8** %0) {
%2 = alloca i8**
store i8** %0, i8*** %2
%3 = load i8**, i8*** %2
%4 = getelementptr inbounds i8*, i8** %3, i64 1
%5 = load i8*, i8** %4
%6 = icmp eq i8* %5, null
br i1 %6, label %7, label %10
7: ; preds = %1
%8 = load i32, i32* @stderr
%9 = call i32 @fprintf(i32 %8, i8* getelementptr inbounds ([32 x i8], [32 x i8]* @.str, i64 0, i64 0))
br label %19
10: ; preds = %1
%11 = load i8**, i8*** %2
%12 = getelementptr inbounds i8*, i8** %11, i64 1
%13 = load i8*, i8** %12
%14 = call i64 @chdir(i8* %13)
%15 = icmp slt i64 %14, 0
br i1 %15, label %16, label %18
16: ; preds = %10
%17 = call i32 @perror(i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str.1, i64 0, i64 0))
br label %18
18: ; preds = %16, %10
br label %19
19: ; preds = %18, %7
ret i32 1
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [32 x i8] c"cd: need at least one argument\0A\00"
@.str.1 = [28 x i8] c"Unable to change directory:\00"
define i32 @mysh_cd(i8** nocapture %0) {
%2 = getelementptr inbounds i8*, i8** %0, i64 1
%3 = load i8*, i8** %2
%4 = icmp eq i8* %3, null
br i1 %4, label %5, label %8
5: ; preds = %1
%6 = load i32, i32* @stderr
%7 = tail call i32 @fprintf(i32 %6, i8* getelementptr inbounds ([32 x i8], [32 x i8]* @.str, i64 0, i64 0))
br label %13
8: ; preds = %1
%9 = tail call i64 @chdir(i8* %3)
%10 = icmp slt i64 %9, 0
br i1 %10, label %11, label %13
11: ; preds = %8
%12 = tail call i32 @perror(i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str.1, i64 0, i64 0))
br label %13
13: ; preds = %8, %11, %5
ret i32 1
}