#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*/ free(char *);
int /*<<< orphan*/ printf(char *, char *);
char *strconcat(char *, char *);
int main() {
  char *str1 = "computer";
  char *str2 = " programming";
  char *str3 = strconcat(str1, str2);
  printf("str1 = '%s'\n", str1);
  printf("str2 = '%s'\n", str2);
  printf("str3 = '%s'\n", str3);
  free(str3);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeba(%rip),%rax
mov    %rax,-0x10(%rbp)
lea    0xeb8(%rip),%rax
mov    %rax,-0x18(%rbp)
mov    -0x10(%rbp),%rdi
mov    -0x18(%rbp),%rsi
call   1040 <strconcat@plt>
mov    %rax,-0x20(%rbp)
mov    -0x10(%rbp),%rsi
lea    0xea5(%rip),%rdi
call   1050 <printf@plt>
mov    -0x18(%rbp),%rsi
lea    0xea2(%rip),%rdi
call   1050 <printf@plt>
mov    -0x20(%rbp),%rsi
lea    0xe9f(%rip),%rdi
call   1050 <printf@plt>
mov    -0x20(%rbp),%rdi
call   1030 <free@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %rbx
lea    0xec4(%rip),%r15
lea    0xec6(%rip),%r14
mov    %r15,%rdi
mov    %r14,%rsi
call   1040 <strconcat@plt>
mov    %rax,%rbx
lea    0xebe(%rip),%rdi
mov    %r15,%rsi
call   1050 <printf@plt>
lea    0xebc(%rip),%rdi
mov    %r14,%rsi
call   1050 <printf@plt>
lea    0xeba(%rip),%rdi
mov    %rbx,%rsi
call   1050 <printf@plt>
mov    %rbx,%rdi
call   1030 <free@plt>
xor    %eax,%eax
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [9 x i8] c"computer\00"
@.str.1 = [13 x i8] c" programming\00"
@.str.2 = [13 x i8] c"str1 = '%s'\0A\00"
@.str.3 = [13 x i8] c"str2 = '%s'\0A\00"
@.str.4 = [13 x i8] c"str3 = '%s'\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i8*
%3 = alloca i8*
%4 = alloca i8*
store i32 0, i32* %1
store i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i64 0, i64 0), i8** %2
store i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.1, i64 0, i64 0), i8** %3
%5 = load i8*, i8** %2
%6 = load i8*, i8** %3
%7 = call i8* @strconcat(i8* %5, i8* %6)
store i8* %7, i8** %4
%8 = load i8*, i8** %2
%9 = call i32 @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), i8* %8)
%10 = load i8*, i8** %3
%11 = call i32 @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.3, i64 0, i64 0), i8* %10)
%12 = load i8*, i8** %4
%13 = call i32 @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.4, i64 0, i64 0), i8* %12)
%14 = load i8*, i8** %4
%15 = call i32 @free(i8* %14)
ret i32 0
}

LLVM IR (-O2):
@.str = [9 x i8] c"computer\00"
@.str.1 = [13 x i8] c" programming\00"
@.str.2 = [13 x i8] c"str1 = '%s'\0A\00"
@.str.3 = [13 x i8] c"str2 = '%s'\0A\00"
@.str.4 = [13 x i8] c"str3 = '%s'\0A\00"
define i32 @main() {
%1 = tail call i8* @strconcat(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.1, i64 0, i64 0))
%2 = tail call i32 @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i64 0, i64 0))
%3 = tail call i32 @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.3, i64 0, i64 0), i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.1, i64 0, i64 0))
%4 = tail call i32 @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.4, i64 0, i64 0), i8* %1)
%5 = tail call i32 @free(i8* %1)
ret i32 0
}