#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(size_t);
int /*<<< orphan*/ strcpy(char *, char const *);
size_t strlen(char const *);
char *path_cat(const char *path, char *file) {
  size_t path_len = strlen(path), file_len = strlen(file);
  char *result;
  result = malloc((path_len + file_len + 2) * sizeof(*path));
  strcpy(result, path);
  result[path_len] = '/';
  strcpy(result + path_len + 1, file);
  return result;
}


x86 assembly (clang, -O0):
<path_cat>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    -0x8(%rbp),%rdi
call   1040 <strlen@plt>
mov    %rax,-0x18(%rbp)
mov    -0x10(%rbp),%rdi
call   1040 <strlen@plt>
mov    %rax,-0x20(%rbp)
mov    -0x18(%rbp),%rdi
add    -0x20(%rbp),%rdi
add    $0x2,%rdi
shl    $0x0,%rdi
call   1050 <malloc@plt>
mov    %rax,-0x28(%rbp)
mov    -0x28(%rbp),%rdi
mov    -0x8(%rbp),%rsi
call   1030 <strcpy@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
call   1030 <strcpy@plt>
mov    -0x28(%rbp),%rax
add    $0x30,%rsp
pop    %rbp
ret

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

LLVM IR (-O0):
define i8* @path_cat(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 = mul i64 %15, 1
%17 = call i8* @malloc(i64 %16)
store i8* %17, i8** %7
%18 = load i8*, i8** %7
%19 = load i8*, i8** %3
%20 = call i32 @strcpy(i8* %18, i8* %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 = call i32 @strcpy(i8* %27, i8* %28)
%30 = load i8*, i8** %7
ret i8* %30
}

LLVM IR (-O2):
define i8* @path_cat(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 = tail call i32 @strcpy(i8* %7, i8* %0)
%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 @strcpy(i8* %10, i8* %1)
ret i8* %7
}