#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 match(char *, char *);
int /*<<< orphan*/ printf(char *, ...);
main() {
  char a[100], b[100];
  int position;
  printf("Enter some text\n");
  gets(a);
  printf("Enter a string to find\n");
  gets(b);
  position = match(a, b);
  if (position != -1)
    printf("Found at location %d\n", position + 1);
  else
    printf("Not found.\n");
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0xf0,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeb7(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    -0x70(%rbp),%rdi
call   1040 <gets@plt>
lea    0xeb1(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    -0xe0(%rbp),%rdi
call   1040 <gets@plt>
lea    -0x70(%rbp),%rdi
lea    -0xe0(%rbp),%rsi
call   1050 <match@plt>
mov    %eax,-0xe4(%rbp)
cmpl   $0xffffffff,-0xe4(%rbp)
je     11b2 <main+0x82>
mov    -0xe4(%rbp),%esi
add    $0x1,%esi
lea    0xe83(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
jmp    11c0 <main+0x90>
lea    0xe86(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0xf0,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
sub    $0xd8,%rsp
lea    0xec5(%rip),%rdi
call   1030 <puts@plt>
lea    0x70(%rsp),%r14
mov    %r14,%rdi
call   1050 <gets@plt>
lea    0xebc(%rip),%rdi
call   1030 <puts@plt>
mov    %rsp,%rbx
mov    %rbx,%rdi
call   1050 <gets@plt>
mov    %r14,%rdi
mov    %rbx,%rsi
call   1060 <match@plt>
cmp    $0xffffffff,%eax
je     119f <main+0x5f>
add    $0x1,%eax
lea    0xe6c(%rip),%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1040 <printf@plt>
jmp    11ab <main+0x6b>
lea    0xe97(%rip),%rdi
call   1030 <puts@plt>
xor    %eax,%eax
add    $0xd8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [17 x i8] c"Enter some text\0A\00"
@.str.1 = [24 x i8] c"Enter a string to find\0A\00"
@.str.2 = [22 x i8] c"Found at location %d\0A\00"
@.str.3 = [12 x i8] c"Not found.\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca [100 x i8]
%3 = alloca [100 x i8]
%4 = alloca i32
store i32 0, i32* %1
%5 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str, i64 0, i64 0))
%6 = getelementptr inbounds [100 x i8], [100 x i8]* %2, i64 0, i64 0
%7 = call i32 @gets(i8* %6)
%8 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.1, i64 0, i64 0))
%9 = getelementptr inbounds [100 x i8], [100 x i8]* %3, i64 0, i64 0
%10 = call i32 @gets(i8* %9)
%11 = getelementptr inbounds [100 x i8], [100 x i8]* %2, i64 0, i64 0
%12 = getelementptr inbounds [100 x i8], [100 x i8]* %3, i64 0, i64 0
%13 = call i32 @match(i8* %11, i8* %12)
store i32 %13, i32* %4
%14 = load i32, i32* %4
%15 = icmp ne i32 %14, -1
br i1 %15, label %16, label %20
16: ; preds = %0
%17 = load i32, i32* %4
%18 = add nsw i32 %17, 1
%19 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str.2, i64 0, i64 0), i32 %18)
br label %22
20: ; preds = %0
%21 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.3, i64 0, i64 0))
br label %22
22: ; preds = %20, %16
ret i32 0
}

LLVM IR (-O2):
@.str.2 = [22 x i8] c"Found at location %d\0A\00"
@str = [16 x i8] c"Enter some text\00"
@str.4 = [23 x i8] c"Enter a string to find\00"
@str.5 = [11 x i8] c"Not found.\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 ([16 x i8], [16 x i8]* @str, i64 0, i64 0))
%6 = call i32 @gets(i8* %3)
%7 = call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([23 x i8], [23 x i8]* @str.4, i64 0, i64 0))
%8 = call i32 @gets(i8* %4)
%9 = call i32 @match(i8* %3, i8* %4)
%10 = icmp eq i32 %9, -1
br i1 %10, label %14, label %11
11: ; preds = %0
%12 = add nuw nsw i32 %9, 1
%13 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([22 x i8], [22 x i8]* @.str.2, i64 0, i64 0), i32 %12)
br label %16
14: ; preds = %0
%15 = call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([11 x i8], [11 x i8]* @str.5, i64 0, i64 0))
br label %16
16: ; preds = %14, %11
ret i32 0
}