#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(int);
int /*<<< orphan*/ strcat(char *, char *);
int /*<<< orphan*/ strcpy(char *, char *);
int strlen(char *);
char *strjoin_with_separator(char *a, char *b) {
  char *res = malloc(strlen(a) + 1 + strlen(b) + 1);
  if (res) {
    strcpy(res, a);
    res[strlen(a)] = '/';
    res[strlen(a) + 1] = '\0';
    strcat(res, b);
  }
  return res;
}


x86 assembly (clang, -O0):
<strjoin_with_separator>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    -0x8(%rbp),%rdi
call   1040 <strlen@plt>
add    $0x1,%eax
mov    %eax,-0x1c(%rbp)
mov    -0x10(%rbp),%rdi
call   1040 <strlen@plt>
mov    -0x1c(%rbp),%edi
add    %eax,%edi
add    $0x1,%edi
call   1050 <malloc@plt>
mov    %rax,-0x18(%rbp)
cmpq   $0x0,-0x18(%rbp)
je     11dd <strjoin_with_separator+0x9d>
mov    -0x18(%rbp),%rdi
mov    -0x8(%rbp),%rsi
call   1030 <strcpy@plt>
mov    -0x18(%rbp),%rax
mov    %rax,-0x30(%rbp)
mov    -0x8(%rbp),%rdi
call   1040 <strlen@plt>
mov    %eax,%ecx
mov    -0x30(%rbp),%rax
movslq %ecx,%rcx
movb   $0x2f,(%rax,%rcx,1)
mov    -0x18(%rbp),%rax
mov    %rax,-0x28(%rbp)
mov    -0x8(%rbp),%rdi
call   1040 <strlen@plt>
mov    %eax,%ecx
mov    -0x28(%rbp),%rax
add    $0x1,%ecx
movslq %ecx,%rcx
movb   $0x0,(%rax,%rcx,1)
mov    -0x18(%rbp),%rdi
mov    -0x10(%rbp),%rsi
call   1060 <strcat@plt>
mov    -0x18(%rbp),%rax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<strjoin_with_separator>:
push   %r15
push   %r14
push   %rbx
mov    %rsi,%r14
mov    %rdi,%r15
call   1040 <strlen@plt>
mov    %eax,%ebx
mov    %r14,%rdi
call   1040 <strlen@plt>
lea    (%rbx,%rax,1),%edi
add    $0x2,%edi
call   1050 <malloc@plt>
mov    %rax,%rbx
test   %rax,%rax
je     11a0 <strjoin_with_separator+0x60>
mov    %rbx,%rdi
mov    %r15,%rsi
call   1030 <strcpy@plt>
mov    %r15,%rdi
call   1040 <strlen@plt>
cltq
movb   $0x2f,(%rbx,%rax,1)
mov    %r15,%rdi
call   1040 <strlen@plt>
cltq
movb   $0x0,0x1(%rax,%rbx,1)
mov    %rbx,%rdi
mov    %r14,%rsi
call   1060 <strcat@plt>
mov    %rbx,%rax
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
define i8* @strjoin_with_separator(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 i32 @strlen(i8* %6)
%8 = add nsw i32 %7, 1
%9 = load i8*, i8** %4
%10 = call i32 @strlen(i8* %9)
%11 = add nsw i32 %8, %10
%12 = add nsw i32 %11, 1
%13 = call i8* @malloc(i32 %12)
store i8* %13, i8** %5
%14 = load i8*, i8** %5
%15 = icmp ne i8* %14, null
br i1 %15, label %16, label %34
16: ; preds = %2
%17 = load i8*, i8** %5
%18 = load i8*, i8** %3
%19 = call i32 @strcpy(i8* %17, i8* %18)
%20 = load i8*, i8** %5
%21 = load i8*, i8** %3
%22 = call i32 @strlen(i8* %21)
%23 = sext i32 %22 to i64
%24 = getelementptr inbounds i8, i8* %20, i64 %23
store i8 47, i8* %24
%25 = load i8*, i8** %5
%26 = load i8*, i8** %3
%27 = call i32 @strlen(i8* %26)
%28 = add nsw i32 %27, 1
%29 = sext i32 %28 to i64
%30 = getelementptr inbounds i8, i8* %25, i64 %29
store i8 0, i8* %30
%31 = load i8*, i8** %5
%32 = load i8*, i8** %4
%33 = call i32 @strcat(i8* %31, i8* %32)
br label %34
34: ; preds = %16, %2
%35 = load i8*, i8** %5
ret i8* %35
}

LLVM IR (-O2):
define i8* @strjoin_with_separator(i8* %0, i8* %1) {
%3 = tail call i32 @strlen(i8* %0)
%4 = tail call i32 @strlen(i8* %1)
%5 = add i32 %3, 2
%6 = add i32 %5, %4
%7 = tail call i8* @malloc(i32 %6)
%8 = icmp eq i8* %7, null
br i1 %8, label %19, label %9
9: ; preds = %2
%10 = tail call i32 @strcpy(i8* %7, i8* %0)
%11 = tail call i32 @strlen(i8* %0)
%12 = sext i32 %11 to i64
%13 = getelementptr inbounds i8, i8* %7, i64 %12
store i8 47, i8* %13
%14 = tail call i32 @strlen(i8* %0)
%15 = add nsw i32 %14, 1
%16 = sext i32 %15 to i64
%17 = getelementptr inbounds i8, i8* %7, i64 %16
store i8 0, i8* %17
%18 = tail call i32 @strcat(i8* %7, i8* %1)
br label %19
19: ; preds = %9, %2
ret i8* %7
}