#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 *);
scalar_t__ strcmp(char *, char *);
int /*<<< orphan*/ strcpy(char *, char *);
int /*<<< orphan*/ strrev(char *);
int main() {
  char a[100], b[100];
  printf("Enter string:\n");
  gets(a);
  strcpy(b, a);
  strrev(b);
  if (strcmp(a, b) != 0)
    printf("0");
  else
    printf("1");
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0xe0,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xe97(%rip),%rdi
call   1040 <printf@plt>
lea    -0x70(%rbp),%rdi
call   1060 <gets@plt>
lea    -0xe0(%rbp),%rdi
lea    -0x70(%rbp),%rsi
call   1030 <strcpy@plt>
lea    -0xe0(%rbp),%rdi
call   1070 <strrev@plt>
lea    -0x70(%rbp),%rdi
lea    -0xe0(%rbp),%rsi
call   1050 <strcmp@plt>
cmp    $0x0,%rax
je     11be <main+0x6e>
lea    0xe5b(%rip),%rdi
call   1040 <printf@plt>
jmp    11ca <main+0x7a>
lea    0xe4c(%rip),%rdi
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    0xe8f(%rip),%rdi
call   1050 <puts@plt>
lea    0x70(%rsp),%r14
mov    %r14,%rdi
call   1070 <gets@plt>
mov    %rsp,%rbx
mov    %rbx,%rdi
mov    %r14,%rsi
call   1040 <strcpy@plt>
mov    %rbx,%rdi
call   1080 <strrev@plt>
mov    %r14,%rdi
mov    %rbx,%rsi
call   1060 <strcmp@plt>
xor    %edi,%edi
test   %rax,%rax
sete   %dil
or     $0x30,%edi
call   1030 <putchar@plt>
xor    %eax,%eax
add    $0xd8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [15 x i8] c"Enter string:\0A\00"
@.str.1 = [2 x i8] c"0\00"
@.str.2 = [2 x i8] c"1\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca [100 x i8]
%3 = alloca [100 x i8]
store i32 0, i32* %1
%4 = call i32 @printf(i8* getelementptr inbounds ([15 x i8], [15 x i8]* @.str, i64 0, i64 0))
%5 = getelementptr inbounds [100 x i8], [100 x i8]* %2, i64 0, i64 0
%6 = call i32 @gets(i8* %5)
%7 = getelementptr inbounds [100 x i8], [100 x i8]* %3, i64 0, i64 0
%8 = getelementptr inbounds [100 x i8], [100 x i8]* %2, 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 @strrev(i8* %10)
%12 = getelementptr inbounds [100 x i8], [100 x i8]* %2, i64 0, i64 0
%13 = getelementptr inbounds [100 x i8], [100 x i8]* %3, i64 0, i64 0
%14 = call i64 @strcmp(i8* %12, i8* %13)
%15 = icmp ne i64 %14, 0
br i1 %15, label %16, label %18
16: ; preds = %0
%17 = call i32 @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
br label %20
18: ; preds = %0
%19 = call i32 @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0))
br label %20
20: ; preds = %18, %16
ret i32 0
}

LLVM IR (-O2):
@str = [14 x i8] c"Enter string:\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 @puts(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 @strcpy(i8* %4, i8* %3)
%8 = call i32 @strrev(i8* %4)
%9 = call i64 @strcmp(i8* %3, i8* %4)
%10 = icmp eq i64 %9, 0
%11 = select i1 %10, i32 49, i32 48
%12 = call i32 @putchar(i32 %11)
ret i32 0
}