#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*/ getch();
int /*<<< orphan*/ gets(char *);
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ strcpy(char *, char *);
main() {
  char str1[100], str2[100], str3[100];
  printf("Entre com uma string: ");
  gets(str1);
  strcpy(str2, str1);
  strcpy(str3, "Voce digitou a string ");
  printf("\n\n%s%s", str3, str2);
  getch();
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x150,%rsp
lea    0xeae(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    -0x70(%rbp),%rdi
call   1050 <gets@plt>
lea    -0xe0(%rbp),%rdi
lea    -0x70(%rbp),%rsi
call   1030 <strcpy@plt>
lea    -0x150(%rbp),%rdi
lea    0xe97(%rip),%rsi
call   1030 <strcpy@plt>
lea    -0x150(%rbp),%rsi
lea    -0xe0(%rbp),%rdx
lea    0xe94(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
mov    $0x0,%al
call   1060 <getch@plt>
xor    %eax,%eax
add    $0x150,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
sub    $0x148,%rsp
lea    0xeaf(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xe0(%rsp),%rbx
mov    %rbx,%rdi
call   1050 <gets@plt>
lea    0x70(%rsp),%r14
mov    %r14,%rdi
mov    %rbx,%rsi
call   1030 <strcpy@plt>
lea    0xe98(%rip),%rsi
mov    %rsp,%rbx
mov    %rbx,%rdi
call   1030 <strcpy@plt>
lea    0xe9d(%rip),%rdi
mov    %rbx,%rsi
mov    %r14,%rdx
xor    %eax,%eax
call   1040 <printf@plt>
xor    %eax,%eax
call   1060 <getch@plt>
xor    %eax,%eax
add    $0x148,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [23 x i8] c"Entre com uma string: \00"
@.str.1 = [23 x i8] c"Voce digitou a string \00"
@.str.2 = [7 x i8] c"\0A\0A%s%s\00"
define i32 @main() {
%1 = alloca [100 x i8]
%2 = alloca [100 x i8]
%3 = alloca [100 x i8]
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str, i64 0, i64 0))
%5 = getelementptr inbounds [100 x i8], [100 x i8]* %1, i64 0, i64 0
%6 = call i32 @gets(i8* %5)
%7 = getelementptr inbounds [100 x i8], [100 x i8]* %2, i64 0, i64 0
%8 = getelementptr inbounds [100 x i8], [100 x i8]* %1, i64 0, i64 0
%9 = call i32 @strcpy(i8* %7, i8* %8)
%10 = getelementptr inbounds [100 x i8], [100 x i8]* %3, i64 0, i64 0
%11 = call i32 @strcpy(i8* %10, i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.1, i64 0, i64 0))
%12 = getelementptr inbounds [100 x i8], [100 x i8]* %3, i64 0, i64 0
%13 = getelementptr inbounds [100 x i8], [100 x i8]* %2, i64 0, i64 0
%14 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.2, i64 0, i64 0), i8* %12, i8* %13)
%15 = call i32 (...) @getch()
ret i32 0
}

LLVM IR (-O2):
@.str = [23 x i8] c"Entre com uma string: \00"
@.str.1 = [23 x i8] c"Voce digitou a string \00"
@.str.2 = [7 x i8] c"\0A\0A%s%s\00"
define i32 @main() {
%1 = alloca [100 x i8]
%2 = alloca [100 x i8]
%3 = alloca [100 x i8]
%4 = getelementptr inbounds [100 x i8], [100 x i8]* %1, i64 0, i64 0
%5 = getelementptr inbounds [100 x i8], [100 x i8]* %2, i64 0, i64 0
%6 = getelementptr inbounds [100 x i8], [100 x i8]* %3, i64 0, i64 0
%7 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([23 x i8], [23 x i8]* @.str, i64 0, i64 0))
%8 = call i32 @gets(i8* %4)
%9 = call i32 @strcpy(i8* %5, i8* %4)
%10 = call i32 @strcpy(i8* %6, i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.1, i64 0, i64 0))
%11 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([7 x i8], [7 x i8]* @.str.2, i64 0, i64 0), i8* %6, i8* %5)
%12 = call i32 (...) @getch()
ret i32 0
}