#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*/ gets(char *);
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ strcat(char *, char *);
void main() {
  char str[50], str2[50], i;
  printf("Enter part 1:");
  gets(str);
  printf("\nEnter part 2:");
  gets(str2);
  strcat(str, str2);
  printf("\n\nOutput:%s\n", str);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x90,%rsp
lea    0xebe(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    -0x40(%rbp),%rdi
call   1040 <gets@plt>
lea    0xeb5(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    -0x80(%rbp),%rdi
call   1040 <gets@plt>
lea    -0x40(%rbp),%rdi
lea    -0x80(%rbp),%rsi
call   1050 <strcat@plt>
lea    -0x40(%rbp),%rsi
lea    0xe9c(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x90,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
sub    $0x78,%rsp
lea    0xec2(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0x40(%rsp),%r14
mov    %r14,%rdi
call   1040 <gets@plt>
lea    0xeb5(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
mov    %rsp,%rbx
mov    %rbx,%rdi
call   1040 <gets@plt>
mov    %r14,%rdi
mov    %rbx,%rsi
call   1050 <strcat@plt>
lea    0xea0(%rip),%rdi
mov    %r14,%rsi
xor    %eax,%eax
call   1030 <printf@plt>
add    $0x78,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [14 x i8] c"Enter part 1:\00"
@.str.1 = [15 x i8] c"\0AEnter part 2:\00"
@.str.2 = [13 x i8] c"\0A\0AOutput:%s\0A\00"
define void @main() {
%1 = alloca [50 x i8]
%2 = alloca [50 x i8]
%3 = alloca i8
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str, i64 0, i64 0))
%5 = getelementptr inbounds [50 x i8], [50 x i8]* %1, i64 0, i64 0
%6 = call i32 @gets(i8* %5)
%7 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str.1, i64 0, i64 0))
%8 = getelementptr inbounds [50 x i8], [50 x i8]* %2, i64 0, i64 0
%9 = call i32 @gets(i8* %8)
%10 = getelementptr inbounds [50 x i8], [50 x i8]* %1, i64 0, i64 0
%11 = getelementptr inbounds [50 x i8], [50 x i8]* %2, i64 0, i64 0
%12 = call i32 @strcat(i8* %10, i8* %11)
%13 = getelementptr inbounds [50 x i8], [50 x i8]* %1, i64 0, i64 0
%14 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), i8* %13)
ret void
}

LLVM IR (-O2):
@.str = [14 x i8] c"Enter part 1:\00"
@.str.1 = [15 x i8] c"\0AEnter part 2:\00"
@.str.2 = [13 x i8] c"\0A\0AOutput:%s\0A\00"
define void @main() {
%1 = alloca [50 x i8]
%2 = alloca [50 x i8]
%3 = getelementptr inbounds [50 x i8], [50 x i8]* %1, i64 0, i64 0
%4 = getelementptr inbounds [50 x i8], [50 x i8]* %2, i64 0, i64 0
%5 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([14 x i8], [14 x i8]* @.str, i64 0, i64 0))
%6 = call i32 @gets(i8* %3)
%7 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([15 x i8], [15 x i8]* @.str.1, i64 0, i64 0))
%8 = call i32 @gets(i8* %4)
%9 = call i32 @strcat(i8* %3, i8* %4)
%10 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), i8* %3)
ret void
}