#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 */
char *malloc(scalar_t__);
int /*<<< orphan*/ strcat(char *, char const *);
scalar_t__ strlen(char const *);
char *myls_path_concat(const char *a, const char *b) {
  char *res;
  if ((res = malloc(strlen(a) + strlen(b) + 2 * sizeof(char))) == NULL)
    return res;
  res[0] = '\0';
  strcat(res, a);
  strcat(res, "/");
  strcat(res, b);
  return res;
}


x86 assembly (clang, -O0):
<myls_path_concat>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x10(%rbp)
mov    %rsi,-0x18(%rbp)
mov    -0x10(%rbp),%rdi
call   1030 <strlen@plt>
mov    %rax,-0x28(%rbp)
mov    -0x18(%rbp),%rdi
call   1030 <strlen@plt>
mov    -0x28(%rbp),%rdi
add    %rax,%rdi
add    $0x2,%rdi
call   1040 <malloc@plt>
mov    %rax,-0x20(%rbp)
cmp    $0x0,%rax
jne    1181 <myls_path_concat+0x51>
mov    -0x20(%rbp),%rax
mov    %rax,-0x8(%rbp)
jmp    11ba <myls_path_concat+0x8a>
mov    -0x20(%rbp),%rax
movb   $0x0,(%rax)
mov    -0x20(%rbp),%rdi
mov    -0x10(%rbp),%rsi
call   1050 <strcat@plt>
mov    -0x20(%rbp),%rdi
lea    0xe60(%rip),%rsi
call   1050 <strcat@plt>
mov    -0x20(%rbp),%rdi
mov    -0x18(%rbp),%rsi
call   1050 <strcat@plt>
mov    -0x20(%rbp),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<myls_path_concat>:
push   %r15
push   %r14
push   %rbx
mov    %rsi,%r14
mov    %rdi,%r15
call   1030 <strlen@plt>
mov    %rax,%rbx
mov    %r14,%rdi
call   1030 <strlen@plt>
lea    (%rbx,%rax,1),%rdi
add    $0x2,%rdi
call   1040 <malloc@plt>
mov    %rax,%rbx
test   %rax,%rax
je     1188 <myls_path_concat+0x58>
movb   $0x0,(%rbx)
mov    %rbx,%rdi
mov    %r15,%rsi
call   1050 <strcat@plt>
lea    0xe8b(%rip),%rsi
mov    %rbx,%rdi
call   1050 <strcat@plt>
mov    %rbx,%rdi
mov    %r14,%rsi
call   1050 <strcat@plt>
mov    %rbx,%rax
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [2 x i8] c"/\00"
define i8* @myls_path_concat(i8* %0, i8* %1) {
%3 = alloca i8*
%4 = alloca i8*
%5 = alloca i8*
%6 = alloca i8*
store i8* %0, i8** %4
store i8* %1, i8** %5
%7 = load i8*, i8** %4
%8 = call i64 @strlen(i8* %7)
%9 = load i8*, i8** %5
%10 = call i64 @strlen(i8* %9)
%11 = add nsw i64 %8, %10
%12 = add i64 %11, 2
%13 = call i8* @malloc(i64 %12)
store i8* %13, i8** %6
%14 = icmp eq i8* %13, null
br i1 %14, label %15, label %17
15: ; preds = %2
%16 = load i8*, i8** %6
store i8* %16, i8** %3
br label %29
17: ; preds = %2
%18 = load i8*, i8** %6
%19 = getelementptr inbounds i8, i8* %18, i64 0
store i8 0, i8* %19
%20 = load i8*, i8** %6
%21 = load i8*, i8** %4
%22 = call i32 @strcat(i8* %20, i8* %21)
%23 = load i8*, i8** %6
%24 = call i32 @strcat(i8* %23, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
%25 = load i8*, i8** %6
%26 = load i8*, i8** %5
%27 = call i32 @strcat(i8* %25, i8* %26)
%28 = load i8*, i8** %6
store i8* %28, i8** %3
br label %29
29: ; preds = %17, %15
%30 = load i8*, i8** %3
ret i8* %30
}

LLVM IR (-O2):
@.str = [2 x i8] c"/\00"
define i8* @myls_path_concat(i8* %0, i8* %1) {
%3 = tail call i64 @strlen(i8* dereferenceable(1) %0)
%4 = tail call i64 @strlen(i8* dereferenceable(1) %1)
%5 = add i64 %3, 2
%6 = add i64 %5, %4
%7 = tail call i8* @malloc(i64 %6)
%8 = icmp eq i8* %7, null
br i1 %8, label %13, label %9
9: ; preds = %2
store i8 0, i8* %7
%10 = tail call i32 @strcat(i8* %7, i8* %0)
%11 = tail call i32 @strcat(i8* %7, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
%12 = tail call i32 @strcat(i8* %7, i8* %1)
br label %13
13: ; preds = %2, %9
ret i8* %7
}