#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 strlen(char *);
int main(void) {
  int len;
  char str[256];
  printf("str: ");
  scanf("%s", str);
  len = strlen(str);
  printf("str = %s\n", str);
  printf("len = %d\n", len);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x110,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeb7(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    -0x110(%rbp),%rsi
lea    0xea8(%rip),%rdi
call   1050 <scanf@plt>
lea    -0x110(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,-0x8(%rbp)
lea    -0x110(%rbp),%rsi
lea    0xe89(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
mov    -0x8(%rbp),%esi
lea    0xe82(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x110,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %rbx
sub    $0x108,%rsp
lea    0xec0(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xeb8(%rip),%rdi
mov    %rsp,%rbx
mov    %rbx,%rsi
call   1050 <scanf@plt>
mov    %rbx,%rdi
call   1030 <strlen@plt>
mov    %eax,%ebp
lea    0xe9f(%rip),%rdi
mov    %rbx,%rsi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xe98(%rip),%rdi
mov    %ebp,%esi
xor    %eax,%eax
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x108,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
@.str = [6 x i8] c"str: \00"
@.str.1 = [3 x i8] c"%s\00"
@.str.2 = [10 x i8] c"str = %s\0A\00"
@.str.3 = [10 x i8] c"len = %d\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca [256 x i8]
store i32 0, i32* %1
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0))
%5 = getelementptr inbounds [256 x i8], [256 x i8]* %3, i64 0, i64 0
%6 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %5)
%7 = getelementptr inbounds [256 x i8], [256 x i8]* %3, i64 0, i64 0
%8 = call i32 @strlen(i8* %7)
store i32 %8, i32* %2
%9 = getelementptr inbounds [256 x i8], [256 x i8]* %3, i64 0, i64 0
%10 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.2, i64 0, i64 0), i8* %9)
%11 = load i32, i32* %2
%12 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.3, i64 0, i64 0), i32 %11)
ret i32 0
}

LLVM IR (-O2):
@.str = [6 x i8] c"str: \00"
@.str.1 = [3 x i8] c"%s\00"
@.str.2 = [10 x i8] c"str = %s\0A\00"
@.str.3 = [10 x i8] c"len = %d\0A\00"
define i32 @main() {
%1 = alloca [256 x i8]
%2 = getelementptr inbounds [256 x i8], [256 x i8]* %1, i64 0, i64 0
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0))
%4 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %2)
%5 = call i32 @strlen(i8* %2)
%6 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([10 x i8], [10 x i8]* @.str.2, i64 0, i64 0), i8* %2)
%7 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([10 x i8], [10 x i8]* @.str.3, i64 0, i64 0), i32 %5)
ret i32 0
}