#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 *getenv(char *);
char *malloc(scalar_t__);
int /*<<< orphan*/ strcat(int /*<<< orphan*/, char *);
int /*<<< orphan*/ strcpy(char *, char *);
scalar_t__ strlen(char *);
char *get_home_file_path(char *filename) {
  char *home = getenv("HOME");
  char *path = malloc(strlen(home) + 1 + strlen(filename) + 1);
  strcat(strcat(strcpy(path, home), "/"), filename);
  return path;
}


x86 assembly (clang, -O0):
<get_home_file_path>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
lea    0xe9d(%rip),%rdi
call   1030 <getenv@plt>
mov    %rax,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
call   1050 <strlen@plt>
add    $0x1,%rax
mov    %rax,-0x20(%rbp)
mov    -0x8(%rbp),%rdi
call   1050 <strlen@plt>
mov    -0x20(%rbp),%rdi
add    %rax,%rdi
add    $0x1,%rdi
call   1060 <malloc@plt>
mov    %rax,-0x18(%rbp)
mov    -0x18(%rbp),%rdi
mov    -0x10(%rbp),%rsi
call   1040 <strcpy@plt>
mov    %eax,%edi
lea    0xe55(%rip),%rsi
call   1070 <strcat@plt>
mov    %eax,%edi
mov    -0x8(%rbp),%rsi
call   1070 <strcat@plt>
mov    -0x18(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<get_home_file_path>:
push   %r15
push   %r14
push   %rbx
mov    %rdi,%r14
lea    0xea1(%rip),%rdi
call   1030 <getenv@plt>
mov    %rax,%rbx
mov    %rax,%rdi
call   1050 <strlen@plt>
mov    %rax,%r15
mov    %r14,%rdi
call   1050 <strlen@plt>
lea    (%r15,%rax,1),%rdi
add    $0x2,%rdi
call   1060 <malloc@plt>
mov    %rax,%r15
mov    %rax,%rdi
mov    %rbx,%rsi
call   1040 <strcpy@plt>
lea    0xe69(%rip),%rsi
mov    %eax,%edi
call   1070 <strcat@plt>
mov    %eax,%edi
mov    %r14,%rsi
call   1070 <strcat@plt>
mov    %r15,%rax
pop    %rbx
pop    %r14
pop    %r15
ret

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

LLVM IR (-O2):
@.str = [5 x i8] c"HOME\00"
@.str.1 = [2 x i8] c"/\00"
define i8* @get_home_file_path(i8* %0) {
%2 = tail call i8* @getenv(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0))
%3 = tail call i64 @strlen(i8* dereferenceable(1) %2)
%4 = tail call i64 @strlen(i8* dereferenceable(1) %0)
%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* %2)
%9 = tail call i32 @strcat(i32 %8, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
%10 = tail call i32 @strcat(i32 %9, i8* %0)
ret i8* %7
}