#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 *);
scalar_t__ strlen(char *);
char *join_path(char *a, char *b) {
  char *result = malloc(strlen(a) + strlen(b) + 2);
  result[0] = '\0';
  strcat(result, a);
  strcat(result, "/");
  strcat(result, b);
  return result;
}


x86 assembly (clang, -O0):
<join_path>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    -0x8(%rbp),%rdi
call   1030 <strlen@plt>
mov    %rax,-0x20(%rbp)
mov    -0x10(%rbp),%rdi
call   1030 <strlen@plt>
mov    -0x20(%rbp),%rdi
add    %rax,%rdi
add    $0x2,%rdi
call   1040 <malloc@plt>
mov    %rax,-0x18(%rbp)
mov    -0x18(%rbp),%rax
movb   $0x0,(%rax)
mov    -0x18(%rbp),%rdi
mov    -0x8(%rbp),%rsi
call   1050 <strcat@plt>
mov    -0x18(%rbp),%rdi
lea    0xe77(%rip),%rsi
call   1050 <strcat@plt>
mov    -0x18(%rbp),%rdi
mov    -0x10(%rbp),%rsi
call   1050 <strcat@plt>
mov    -0x18(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<join_path>:
push   %r15
push   %r14
push   %r12
push   %rbx
push   %rax
mov    %rsi,%r14
mov    %rdi,%r12
call   1030 <strlen@plt>
mov    %rax,%r15
mov    %r14,%rdi
call   1030 <strlen@plt>
lea    (%r15,%rax,1),%rdi
add    $0x2,%rdi
call   1040 <malloc@plt>
mov    %rax,%rbx
movb   $0x0,(%rax)
mov    %rax,%rdi
mov    %r12,%rsi
call   1050 <strcat@plt>
lea    0xe8d(%rip),%rsi
mov    %rbx,%rdi
call   1050 <strcat@plt>
mov    %rbx,%rdi
mov    %r14,%rsi
call   1050 <strcat@plt>
mov    %rbx,%rax
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [2 x i8] c"/\00"
define i8* @join_path(i8* %0, i8* %1) {
%3 = alloca i8*
%4 = alloca i8*
%5 = alloca i8*
store i8* %0, i8** %3
store i8* %1, i8** %4
%6 = load i8*, i8** %3
%7 = call i64 @strlen(i8* %6)
%8 = load i8*, i8** %4
%9 = call i64 @strlen(i8* %8)
%10 = add nsw i64 %7, %9
%11 = add nsw i64 %10, 2
%12 = call i8* @malloc(i64 %11)
store i8* %12, i8** %5
%13 = load i8*, i8** %5
%14 = getelementptr inbounds i8, i8* %13, i64 0
store i8 0, i8* %14
%15 = load i8*, i8** %5
%16 = load i8*, i8** %3
%17 = call i32 @strcat(i8* %15, i8* %16)
%18 = load i8*, i8** %5
%19 = call i32 @strcat(i8* %18, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
%20 = load i8*, i8** %5
%21 = load i8*, i8** %4
%22 = call i32 @strcat(i8* %20, i8* %21)
%23 = load i8*, i8** %5
ret i8* %23
}

LLVM IR (-O2):
@.str = [2 x i8] c"/\00"
define i8* @join_path(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)
store i8 0, i8* %7
%8 = tail call i32 @strcat(i8* %7, i8* %0)
%9 = tail call i32 @strcat(i8* %7, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
%10 = tail call i32 @strcat(i8* %7, i8* %1)
ret i8* %7
}