#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_or_die(scalar_t__);
int /*<<< orphan*/ sprintf(char *, char *, char const *, char const *);
scalar_t__ strlen(char const *);
char *append_file(const char *dir, const char *name) {
  char *file;
  file = malloc_or_die(strlen(dir) + strlen(name) + 2);
  if (!file)
    return NULL;
  sprintf(file, "%s/%s", dir, name);
  return file;
}


x86 assembly (clang, -O0):
<append_file>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x10(%rbp)
mov    %rsi,-0x18(%rbp)
mov    -0x10(%rbp),%rdi
call   1030 <strlen@plt>
mov    %rax,-0x28(%rbp)
mov    -0x18(%rbp),%rdi
call   1030 <strlen@plt>
mov    -0x28(%rbp),%rdi
add    %rax,%rdi
add    $0x2,%rdi
call   1040 <malloc_or_die@plt>
mov    %rax,-0x20(%rbp)
cmpq   $0x0,-0x20(%rbp)
jne    1182 <append_file+0x52>
movq   $0x0,-0x8(%rbp)
jmp    11a2 <append_file+0x72>
mov    -0x20(%rbp),%rdi
mov    -0x10(%rbp),%rdx
mov    -0x18(%rbp),%rcx
lea    0xe6b(%rip),%rsi
call   1050 <sprintf@plt>
mov    -0x20(%rbp),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<append_file>:
push   %r15
push   %r14
push   %rbx
mov    %rsi,%r14
mov    %rdi,%r15
call   1030 <strlen@plt>
mov    %rax,%rbx
mov    %r14,%rdi
call   1030 <strlen@plt>
lea    (%rbx,%rax,1),%rdi
add    $0x2,%rdi
call   1040 <malloc_or_die@plt>
mov    %rax,%rbx
test   %rax,%rax
je     1175 <append_file+0x45>
lea    0xe99(%rip),%rsi
mov    %rbx,%rdi
mov    %r15,%rdx
mov    %r14,%rcx
call   1050 <sprintf@plt>
mov    %rbx,%rax
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [6 x i8] c"%s/%s\00"
define i8* @append_file(i8* %0, i8* %1) {
%3 = alloca i8*
%4 = alloca i8*
%5 = alloca i8*
%6 = alloca i8*
store i8* %0, i8** %4
store i8* %1, i8** %5
%7 = load i8*, i8** %4
%8 = call i64 @strlen(i8* %7)
%9 = load i8*, i8** %5
%10 = call i64 @strlen(i8* %9)
%11 = add nsw i64 %8, %10
%12 = add nsw i64 %11, 2
%13 = call i8* @malloc_or_die(i64 %12)
store i8* %13, i8** %6
%14 = load i8*, i8** %6
%15 = icmp ne i8* %14, null
br i1 %15, label %17, label %16
16: ; preds = %2
store i8* null, i8** %3
br label %23
17: ; preds = %2
%18 = load i8*, i8** %6
%19 = load i8*, i8** %4
%20 = load i8*, i8** %5
%21 = call i32 @sprintf(i8* %18, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i8* %19, i8* %20)
%22 = load i8*, i8** %6
store i8* %22, i8** %3
br label %23
23: ; preds = %17, %16
%24 = load i8*, i8** %3
ret i8* %24
}

LLVM IR (-O2):
@.str = [6 x i8] c"%s/%s\00"
define i8* @append_file(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_or_die(i64 %6)
%8 = icmp eq i8* %7, null
br i1 %8, label %11, label %9
9: ; preds = %2
%10 = tail call i32 @sprintf(i8* %7, i8* dereferenceable(1) getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i8* %0, i8* %1)
br label %11
11: ; preds = %2, %9
ret i8* %7
}