#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 *, char *);
int /*<<< orphan*/ strcats(char *, char *);
int main(void) {
  char a[30];
  char b[10];
  printf("enter 2 string:");
  scanf("%s %s", a, b);
  strcats(a, b);
  printf("%s,%s\n", a, b);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x40,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeba(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    -0x30(%rbp),%rsi
lea    -0x3a(%rbp),%rdx
lea    0xeb4(%rip),%rdi
call   1040 <scanf@plt>
lea    -0x30(%rbp),%rdi
lea    -0x3a(%rbp),%rsi
call   1050 <strcats@plt>
lea    -0x30(%rbp),%rsi
lea    -0x3a(%rbp),%rdx
lea    0xe99(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x40,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
sub    $0x38,%rsp
lea    0xec2(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xec4(%rip),%rdi
lea    0x10(%rsp),%rbx
lea    0x6(%rsp),%r14
mov    %rbx,%rsi
mov    %r14,%rdx
call   1040 <scanf@plt>
mov    %rbx,%rdi
mov    %r14,%rsi
call   1050 <strcats@plt>
lea    0xea3(%rip),%rdi
mov    %rbx,%rsi
mov    %r14,%rdx
xor    %eax,%eax
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x38,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [16 x i8] c"enter 2 string:\00"
@.str.1 = [6 x i8] c"%s %s\00"
@.str.2 = [7 x i8] c"%s,%s\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca [30 x i8]
%3 = alloca [10 x i8]
store i32 0, i32* %1
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str, i64 0, i64 0))
%5 = getelementptr inbounds [30 x i8], [30 x i8]* %2, i64 0, i64 0
%6 = getelementptr inbounds [10 x i8], [10 x i8]* %3, i64 0, i64 0
%7 = call i32 @scanf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0), i8* %5, i8* %6)
%8 = getelementptr inbounds [30 x i8], [30 x i8]* %2, i64 0, i64 0
%9 = getelementptr inbounds [10 x i8], [10 x i8]* %3, i64 0, i64 0
%10 = call i32 @strcats(i8* %8, i8* %9)
%11 = getelementptr inbounds [30 x i8], [30 x i8]* %2, i64 0, i64 0
%12 = getelementptr inbounds [10 x i8], [10 x i8]* %3, i64 0, i64 0
%13 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.2, i64 0, i64 0), i8* %11, i8* %12)
ret i32 0
}

LLVM IR (-O2):
@.str = [16 x i8] c"enter 2 string:\00"
@.str.1 = [6 x i8] c"%s %s\00"
@.str.2 = [7 x i8] c"%s,%s\0A\00"
define i32 @main() {
%1 = alloca [30 x i8]
%2 = alloca [10 x i8]
%3 = getelementptr inbounds [30 x i8], [30 x i8]* %1, i64 0, i64 0
%4 = getelementptr inbounds [10 x i8], [10 x i8]* %2, i64 0, i64 0
%5 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([16 x i8], [16 x i8]* @.str, i64 0, i64 0))
%6 = call i32 @scanf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0), i8* %3, i8* %4)
%7 = call i32 @strcats(i8* %3, i8* %4)
%8 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([7 x i8], [7 x i8]* @.str.2, i64 0, i64 0), i8* %3, i8* %4)
ret i32 0
}