#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 */
scalar_t__ malloc(int);
int /*<<< orphan*/ strcat(char *, char *);
int /*<<< orphan*/ strcpy(char *, char *);
int strlen(char *);
char *strconcat(char *dir, char *file) {
  char *s = (char *)malloc(strlen(dir) + strlen(file) + 1 +
                           ((dir[strlen(dir) - 1] == '/') ? 0 : 1));
  strcpy(s, dir);
  if (dir[strlen(dir) - 1] != '/') {
    strcat(s, "/");
  }
  strcat(s, file);
  return s;
}


x86 assembly (clang, -O0):
<strconcat>:
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    %eax,-0x30(%rbp)
mov    -0x10(%rbp),%rdi
call   1040 <strlen@plt>
mov    %eax,%ecx
mov    -0x30(%rbp),%eax
add    %ecx,%eax
add    $0x1,%eax
mov    %eax,-0x2c(%rbp)
mov    -0x8(%rbp),%rax
mov    %rax,-0x28(%rbp)
mov    -0x8(%rbp),%rdi
call   1040 <strlen@plt>
mov    -0x2c(%rbp),%edi
mov    %eax,%ecx
mov    -0x28(%rbp),%rax
sub    $0x1,%ecx
movslq %ecx,%rcx
movsbl (%rax,%rcx,1),%edx
mov    $0x1,%eax
xor    %ecx,%ecx
cmp    $0x2f,%edx
cmove  %ecx,%eax
add    %eax,%edi
call   1050 <malloc@plt>
mov    %rax,-0x18(%rbp)
mov    -0x18(%rbp),%rdi
mov    -0x8(%rbp),%rsi
call   1030 <strcpy@plt>
mov    -0x8(%rbp),%rax
mov    %rax,-0x20(%rbp)
mov    -0x8(%rbp),%rdi
call   1040 <strlen@plt>
mov    %eax,%ecx
mov    -0x20(%rbp),%rax
sub    $0x1,%ecx
movslq %ecx,%rcx
movsbl (%rax,%rcx,1),%eax
cmp    $0x2f,%eax
je     11f5 <strconcat+0xb5>
mov    -0x18(%rbp),%rdi
lea    0xe10(%rip),%rsi
call   1060 <strcat@plt>
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):
<strconcat>:
push   %rbp
push   %r15
push   %r14
push   %rbx
push   %rax
mov    %rsi,%r14
mov    %rdi,%rbx
call   1040 <strlen@plt>
mov    %eax,%r15d
mov    %r14,%rdi
call   1040 <strlen@plt>
mov    %eax,%ebp
mov    %rbx,%rdi
call   1040 <strlen@plt>
cltq
xor    %ecx,%ecx
cmpb   $0x2f,-0x1(%rax,%rbx,1)
setne  %cl
add    %r15d,%ebp
lea    (%rcx,%rbp,1),%edi
add    $0x1,%edi
call   1050 <malloc@plt>
mov    %rax,%r15
mov    %rax,%rdi
mov    %rbx,%rsi
call   1030 <strcpy@plt>
mov    %rbx,%rdi
call   1040 <strlen@plt>
cltq
cmpb   $0x2f,-0x1(%rax,%rbx,1)
je     11af <strconcat+0x6f>
lea    0xe59(%rip),%rsi
mov    %r15,%rdi
call   1060 <strcat@plt>
mov    %r15,%rdi
mov    %r14,%rsi
call   1060 <strcat@plt>
mov    %r15,%rax
add    $0x8,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
@.str = [2 x i8] c"/\00"
define i8* @strconcat(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 = load i8*, i8** %4
%9 = call i32 @strlen(i8* %8)
%10 = add nsw i32 %7, %9
%11 = add nsw i32 %10, 1
%12 = load i8*, i8** %3
%13 = load i8*, i8** %3
%14 = call i32 @strlen(i8* %13)
%15 = sub nsw i32 %14, 1
%16 = sext i32 %15 to i64
%17 = getelementptr inbounds i8, i8* %12, i64 %16
%18 = load i8, i8* %17
%19 = sext i8 %18 to i32
%20 = icmp eq i32 %19, 47
%21 = zext i1 %20 to i64
%22 = select i1 %20, i32 0, i32 1
%23 = add nsw i32 %11, %22
%24 = call i64 @malloc(i32 %23)
%25 = inttoptr i64 %24 to i8*
store i8* %25, i8** %5
%26 = load i8*, i8** %5
%27 = load i8*, i8** %3
%28 = call i32 @strcpy(i8* %26, i8* %27)
%29 = load i8*, i8** %3
%30 = load i8*, i8** %3
%31 = call i32 @strlen(i8* %30)
%32 = sub nsw i32 %31, 1
%33 = sext i32 %32 to i64
%34 = getelementptr inbounds i8, i8* %29, i64 %33
%35 = load i8, i8* %34
%36 = sext i8 %35 to i32
%37 = icmp ne i32 %36, 47
br i1 %37, label %38, label %41
38: ; preds = %2
%39 = load i8*, i8** %5
%40 = call i32 @strcat(i8* %39, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
br label %41
41: ; preds = %38, %2
%42 = load i8*, i8** %5
%43 = load i8*, i8** %4
%44 = call i32 @strcat(i8* %42, i8* %43)
%45 = load i8*, i8** %5
ret i8* %45
}

LLVM IR (-O2):
@.str = [2 x i8] c"/\00"
define i8* @strconcat(i8* %0, i8* %1) {
%3 = tail call i32 @strlen(i8* %0)
%4 = tail call i32 @strlen(i8* %1)
%5 = tail call i32 @strlen(i8* %0)
%6 = add nsw i32 %5, -1
%7 = sext i32 %6 to i64
%8 = getelementptr inbounds i8, i8* %0, i64 %7
%9 = load i8, i8* %8
%10 = icmp ne i8 %9, 47
%11 = zext i1 %10 to i32
%12 = add i32 %3, 1
%13 = add i32 %12, %4
%14 = add i32 %13, %11
%15 = tail call i64 @malloc(i32 %14)
%16 = inttoptr i64 %15 to i8*
%17 = tail call i32 @strcpy(i8* %16, i8* %0)
%18 = tail call i32 @strlen(i8* %0)
%19 = add nsw i32 %18, -1
%20 = sext i32 %19 to i64
%21 = getelementptr inbounds i8, i8* %0, i64 %20
%22 = load i8, i8* %21
%23 = icmp eq i8 %22, 47
br i1 %23, label %26, label %24
24: ; preds = %2
%25 = tail call i32 @strcat(i8* %16, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
br label %26
26: ; preds = %24, %2
%27 = tail call i32 @strcat(i8* %16, i8* %1)
ret i8* %16
}