#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 /*<<< orphan*/ memcpy(char *, char const *, size_t);
size_t strlen(char const *);
char *xmalloc(size_t);
char *path_join(const char *path, const char *file) {
  size_t len_path = strlen(path);
  size_t len_file = strlen(file);
  char *ret = xmalloc(len_path + len_file + 2);
  memcpy(ret, path, len_path);
  ret[len_path] = '/';
  memcpy(ret + len_path + 1, file, len_file);
  ret[len_path + len_file + 1] = '\0';
  return ret;
}


x86 assembly (clang, -O0):
<path_join>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    -0x8(%rbp),%rdi
call   1030 <strlen@plt>
mov    %rax,-0x18(%rbp)
mov    -0x10(%rbp),%rdi
call   1030 <strlen@plt>
mov    %rax,-0x20(%rbp)
mov    -0x18(%rbp),%rdi
add    -0x20(%rbp),%rdi
add    $0x2,%rdi
call   1040 <xmalloc@plt>
mov    %rax,-0x28(%rbp)
mov    -0x28(%rbp),%rdi
mov    -0x8(%rbp),%rsi
mov    -0x18(%rbp),%rdx
call   1050 <memcpy@plt>
mov    -0x28(%rbp),%rax
mov    -0x18(%rbp),%rcx
movb   $0x2f,(%rax,%rcx,1)
mov    -0x28(%rbp),%rdi
add    -0x18(%rbp),%rdi
add    $0x1,%rdi
mov    -0x10(%rbp),%rsi
mov    -0x20(%rbp),%rdx
call   1050 <memcpy@plt>
mov    -0x28(%rbp),%rax
mov    -0x18(%rbp),%rcx
add    -0x20(%rbp),%rcx
movb   $0x0,0x1(%rax,%rcx,1)
mov    -0x28(%rbp),%rax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<path_join>:
push   %rbp
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
push   %rax
mov    %rsi,%r14
mov    %rdi,%r15
call   1030 <strlen@plt>
mov    %rax,%r13
mov    %r14,%rdi
call   1030 <strlen@plt>
mov    %rax,%r12
lea    (%rax,%r13,1),%rbp
lea    (%rax,%r13,1),%rdi
add    $0x2,%rdi
call   1040 <xmalloc@plt>
mov    %rax,%rbx
mov    %rax,%rdi
mov    %r15,%rsi
mov    %r13,%rdx
call   1050 <memcpy@plt>
movb   $0x2f,(%rbx,%r13,1)
lea    (%rbx,%r13,1),%rdi
add    $0x1,%rdi
mov    %r14,%rsi
mov    %r12,%rdx
call   1050 <memcpy@plt>
movb   $0x0,0x1(%rbx,%rbp,1)
mov    %rbx,%rax
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
define i8* @path_join(i8* %0, i8* %1) {
%3 = alloca i8*
%4 = alloca i8*
%5 = alloca i64
%6 = alloca i64
%7 = alloca i8*
store i8* %0, i8** %3
store i8* %1, i8** %4
%8 = load i8*, i8** %3
%9 = call i64 @strlen(i8* %8)
store i64 %9, i64* %5
%10 = load i8*, i8** %4
%11 = call i64 @strlen(i8* %10)
store i64 %11, i64* %6
%12 = load i64, i64* %5
%13 = load i64, i64* %6
%14 = add i64 %12, %13
%15 = add i64 %14, 2
%16 = call i8* @xmalloc(i64 %15)
store i8* %16, i8** %7
%17 = load i8*, i8** %7
%18 = load i8*, i8** %3
%19 = load i64, i64* %5
%20 = call i32 @memcpy(i8* %17, i8* %18, i64 %19)
%21 = load i8*, i8** %7
%22 = load i64, i64* %5
%23 = getelementptr inbounds i8, i8* %21, i64 %22
store i8 47, i8* %23
%24 = load i8*, i8** %7
%25 = load i64, i64* %5
%26 = getelementptr inbounds i8, i8* %24, i64 %25
%27 = getelementptr inbounds i8, i8* %26, i64 1
%28 = load i8*, i8** %4
%29 = load i64, i64* %6
%30 = call i32 @memcpy(i8* %27, i8* %28, i64 %29)
%31 = load i8*, i8** %7
%32 = load i64, i64* %5
%33 = load i64, i64* %6
%34 = add i64 %32, %33
%35 = add i64 %34, 1
%36 = getelementptr inbounds i8, i8* %31, i64 %35
store i8 0, i8* %36
%37 = load i8*, i8** %7
ret i8* %37
}

LLVM IR (-O2):
define i8* @path_join(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 %4, %3
%6 = add i64 %5, 2
%7 = tail call i8* @xmalloc(i64 %6)
%8 = tail call i32 @memcpy(i8* %7, i8* %0, i64 %3)
%9 = getelementptr inbounds i8, i8* %7, i64 %3
store i8 47, i8* %9
%10 = getelementptr inbounds i8, i8* %9, i64 1
%11 = tail call i32 @memcpy(i8* %10, i8* %1, i64 %4)
%12 = add i64 %5, 1
%13 = getelementptr inbounds i8, i8* %7, i64 %12
store i8 0, i8* %13
ret i8* %7
}