#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 */
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *);
char *malloc(scalar_t__);
int /*<<< orphan*/ stderr;
int /*<<< orphan*/ strcat(char *, char *);
int /*<<< orphan*/ strcpy(char *, char *);
scalar_t__ strlen(char *);
char *ConcatenateStrings(char *s1, char *s2) {
  char *result = malloc(strlen(s1) + strlen(s2) + 1);
  if (result == NULL) {
    fprintf(stderr,
            "Error: Unable to allocate memory for strings. Malloc failed!\n");
  }
  strcpy(result, s1);
  strcat(result, s2);
  return result;
}


x86 assembly (clang, -O0):
<ConcatenateStrings>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    -0x8(%rbp),%rdi
call   1040 <strlen@plt>
mov    %rax,-0x20(%rbp)
mov    -0x10(%rbp),%rdi
call   1040 <strlen@plt>
mov    -0x20(%rbp),%rdi
add    %rax,%rdi
add    $0x1,%rdi
call   1060 <malloc@plt>
mov    %rax,-0x18(%rbp)
cmpq   $0x0,-0x18(%rbp)
jne    11aa <ConcatenateStrings+0x5a>
mov    0x2e44(%rip),%rax
mov    (%rax),%edi
lea    0xe5b(%rip),%rsi
call   1050 <fprintf@plt>
mov    -0x18(%rbp),%rdi
mov    -0x8(%rbp),%rsi
call   1030 <strcpy@plt>
mov    -0x18(%rbp),%rdi
mov    -0x10(%rbp),%rsi
call   1070 <strcat@plt>
mov    -0x18(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<ConcatenateStrings>:
push   %r15
push   %r14
push   %rbx
mov    %rsi,%r14
mov    %rdi,%r15
call   1040 <strlen@plt>
mov    %rax,%rbx
mov    %r14,%rdi
call   1040 <strlen@plt>
lea    (%rbx,%rax,1),%rdi
add    $0x1,%rdi
call   1060 <malloc@plt>
mov    %rax,%rbx
test   %rax,%rax
jne    1195 <ConcatenateStrings+0x45>
mov    0x2e59(%rip),%rax
mov    (%rax),%edi
lea    0xe70(%rip),%rsi
call   1050 <fprintf@plt>
mov    %rbx,%rdi
mov    %r15,%rsi
call   1030 <strcpy@plt>
mov    %rbx,%rdi
mov    %r14,%rsi
call   1070 <strcat@plt>
mov    %rbx,%rax
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@stderr = global i32 0
@.str = [62 x i8] c"Error: Unable to allocate memory for strings. Malloc failed!\0A\00"
define i8* @ConcatenateStrings(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, 1
%12 = call i8* @malloc(i64 %11)
store i8* %12, i8** %5
%13 = load i8*, i8** %5
%14 = icmp eq i8* %13, null
br i1 %14, label %15, label %18
15: ; preds = %2
%16 = load i32, i32* @stderr
%17 = call i32 @fprintf(i32 %16, i8* getelementptr inbounds ([62 x i8], [62 x i8]* @.str, i64 0, i64 0))
br label %18
18: ; preds = %15, %2
%19 = load i8*, i8** %5
%20 = load i8*, i8** %3
%21 = call i32 @strcpy(i8* %19, i8* %20)
%22 = load i8*, i8** %5
%23 = load i8*, i8** %4
%24 = call i32 @strcat(i8* %22, i8* %23)
%25 = load i8*, i8** %5
ret i8* %25
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [62 x i8] c"Error: Unable to allocate memory for strings. Malloc failed!\0A\00"
define i8* @ConcatenateStrings(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, 1
%6 = add i64 %5, %4
%7 = tail call i8* @malloc(i64 %6)
%8 = icmp eq i8* %7, null
br i1 %8, label %9, label %12
9: ; preds = %2
%10 = load i32, i32* @stderr
%11 = tail call i32 @fprintf(i32 %10, i8* getelementptr inbounds ([62 x i8], [62 x i8]* @.str, i64 0, i64 0))
br label %12
12: ; preds = %9, %2
%13 = tail call i32 @strcpy(i8* %7, i8* %0)
%14 = tail call i32 @strcat(i8* %7, i8* %1)
ret i8* %7
}