#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*/ printf(char *, ...);
int /*<<< orphan*/ scanf(char *, char *);
int /*<<< orphan*/ strcpy(char *, char *);
main() {
  char str1[100], str2[100];
  printf("Enter a string: ");
  scanf("%s", str1);
  strcpy(str2, str1);
  printf("\nOriginal string: %s\n", str1);
  printf("Copied string: %s\n", str2);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0xe0,%rsp
lea    0xebe(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    -0x70(%rbp),%rsi
lea    0xebd(%rip),%rdi
call   1050 <scanf@plt>
lea    -0xe0(%rbp),%rdi
lea    -0x70(%rbp),%rsi
call   1030 <strcpy@plt>
lea    -0x70(%rbp),%rsi
lea    0xea0(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    -0xe0(%rbp),%rsi
lea    0xea1(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
xor    %eax,%eax
add    $0xe0,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
sub    $0xd8,%rsp
lea    0xebf(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xec2(%rip),%rdi
lea    0x70(%rsp),%rbx
mov    %rbx,%rsi
call   1050 <scanf@plt>
mov    %rsp,%r14
mov    %r14,%rdi
mov    %rbx,%rsi
call   1030 <strcpy@plt>
lea    0xea3(%rip),%rdi
mov    %rbx,%rsi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xea8(%rip),%rdi
mov    %r14,%rsi
xor    %eax,%eax
call   1040 <printf@plt>
xor    %eax,%eax
add    $0xd8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [17 x i8] c"Enter a string: \00"
@.str.1 = [3 x i8] c"%s\00"
@.str.2 = [22 x i8] c"\0AOriginal string: %s\0A\00"
@.str.3 = [19 x i8] c"Copied string: %s\0A\00"
define i32 @main() {
%1 = alloca [100 x i8]
%2 = alloca [100 x i8]
%3 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str, i64 0, i64 0))
%4 = getelementptr inbounds [100 x i8], [100 x i8]* %1, i64 0, i64 0
%5 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %4)
%6 = getelementptr inbounds [100 x i8], [100 x i8]* %2, i64 0, i64 0
%7 = getelementptr inbounds [100 x i8], [100 x i8]* %1, i64 0, i64 0
%8 = call i32 @strcpy(i8* %6, i8* %7)
%9 = getelementptr inbounds [100 x i8], [100 x i8]* %1, i64 0, i64 0
%10 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str.2, i64 0, i64 0), i8* %9)
%11 = getelementptr inbounds [100 x i8], [100 x i8]* %2, i64 0, i64 0
%12 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.3, i64 0, i64 0), i8* %11)
ret i32 0
}

LLVM IR (-O2):
@.str = [17 x i8] c"Enter a string: \00"
@.str.1 = [3 x i8] c"%s\00"
@.str.2 = [22 x i8] c"\0AOriginal string: %s\0A\00"
@.str.3 = [19 x i8] c"Copied string: %s\0A\00"
define i32 @main() {
%1 = alloca [100 x i8]
%2 = alloca [100 x i8]
%3 = getelementptr inbounds [100 x i8], [100 x i8]* %1, i64 0, i64 0
%4 = getelementptr inbounds [100 x i8], [100 x i8]* %2, i64 0, i64 0
%5 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([17 x i8], [17 x i8]* @.str, i64 0, i64 0))
%6 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %3)
%7 = call i32 @strcpy(i8* %4, i8* %3)
%8 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([22 x i8], [22 x i8]* @.str.2, i64 0, i64 0), i8* %3)
%9 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([19 x i8], [19 x i8]* @.str.3, i64 0, i64 0), i8* %4)
ret i32 0
}