#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 linear_search(int *, int, int);
int /*<<< orphan*/ printf(char *, ...);
int /*<<< orphan*/ scanf(char *, int *);
int main() {
  int i, n, arr[100], item, index;
  printf("Enter the no. of elements: ");
  scanf("%d", &n);
  printf("Enter the elements: ");
  for (i = 0; i < n; i++)
    scanf("%d", &arr[i]);
  printf("Enter an item to search: ");
  scanf("%d", &item);
  index = linear_search(arr, n, item);
  if (index == -1)
    printf("Item not found!\n");
  else
    printf("Item found in index: %d\n", index);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x1b0,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeb7(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    0xec5(%rip),%rdi
lea    -0xc(%rbp),%rsi
call   1050 <scanf@plt>
lea    0xeb8(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
movl   $0x0,-0x8(%rbp)
mov    -0x8(%rbp),%eax
cmp    -0xc(%rbp),%eax
jge    11ad <main+0x7d>
movslq -0x8(%rbp),%rax
lea    -0x1a0(%rbp),%rsi
shl    $0x2,%rax
add    %rax,%rsi
lea    0xe82(%rip),%rdi
call   1050 <scanf@plt>
mov    -0x8(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x8(%rbp)
jmp    1175 <main+0x45>
lea    0xe80(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
lea    0xe5a(%rip),%rdi
lea    -0x1a4(%rbp),%rsi
call   1050 <scanf@plt>
lea    -0x1a0(%rbp),%rdi
mov    -0xc(%rbp),%esi
mov    -0x1a4(%rbp),%edx
call   1030 <linear_search@plt>
mov    %eax,-0x1a8(%rbp)
cmpl   $0xffffffff,-0x1a8(%rbp)
jne    1209 <main+0xd9>
lea    0xe51(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
jmp    121d <main+0xed>
mov    -0x1a8(%rbp),%esi
lea    0xe49(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x1b0,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %rbx
sub    $0x1a0,%rsp
lea    0xead(%rip),%rdi
xor    %eax,%eax
call   1050 <printf@plt>
lea    0xebb(%rip),%rdi
lea    0x8(%rsp),%rsi
call   1060 <scanf@plt>
lea    0xead(%rip),%rdi
xor    %eax,%eax
call   1050 <printf@plt>
cmpl   $0x0,0x8(%rsp)
jle    11ad <main+0x6d>
lea    0x10(%rsp),%r15
xor    %ebx,%ebx
lea    0xe8e(%rip),%r14
xchg   %ax,%ax
mov    %r14,%rdi
mov    %r15,%rsi
call   1060 <scanf@plt>
add    $0x1,%rbx
movslq 0x8(%rsp),%rax
add    $0x4,%r15
cmp    %rax,%rbx
jl     1190 <main+0x50>
lea    0xe80(%rip),%rdi
xor    %eax,%eax
call   1050 <printf@plt>
lea    0xe5a(%rip),%rdi
lea    0xc(%rsp),%rsi
call   1060 <scanf@plt>
mov    0x8(%rsp),%esi
mov    0xc(%rsp),%edx
lea    0x10(%rsp),%rdi
call   1040 <linear_search@plt>
cmp    $0xffffffff,%eax
je     11f5 <main+0xb5>
lea    0xe64(%rip),%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1050 <printf@plt>
jmp    1201 <main+0xc1>
lea    0xe6b(%rip),%rdi
call   1030 <puts@plt>
xor    %eax,%eax
add    $0x1a0,%rsp
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [28 x i8] c"Enter the no. of elements: \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [21 x i8] c"Enter the elements: \00"
@.str.3 = [26 x i8] c"Enter an item to search: \00"
@.str.4 = [17 x i8] c"Item not found!\0A\00"
@.str.5 = [25 x i8] c"Item found in index: %d\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
%4 = alloca [100 x i32]
%5 = alloca i32
%6 = alloca i32
store i32 0, i32* %1
%7 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str, i64 0, i64 0))
%8 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %3)
%9 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.2, i64 0, i64 0))
store i32 0, i32* %2
br label %10
10: ; preds = %19, %0
%11 = load i32, i32* %2
%12 = load i32, i32* %3
%13 = icmp slt i32 %11, %12
br i1 %13, label %14, label %22
14: ; preds = %10
%15 = load i32, i32* %2
%16 = sext i32 %15 to i64
%17 = getelementptr inbounds [100 x i32], [100 x i32]* %4, i64 0, i64 %16
%18 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %17)
br label %19
19: ; preds = %14
%20 = load i32, i32* %2
%21 = add nsw i32 %20, 1
store i32 %21, i32* %2
br label %10
22: ; preds = %10
%23 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.3, i64 0, i64 0))
%24 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %5)
%25 = getelementptr inbounds [100 x i32], [100 x i32]* %4, i64 0, i64 0
%26 = load i32, i32* %3
%27 = load i32, i32* %5
%28 = call i32 @linear_search(i32* %25, i32 %26, i32 %27)
store i32 %28, i32* %6
%29 = load i32, i32* %6
%30 = icmp eq i32 %29, -1
br i1 %30, label %31, label %33
31: ; preds = %22
%32 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.4, i64 0, i64 0))
br label %36
33: ; preds = %22
%34 = load i32, i32* %6
%35 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.5, i64 0, i64 0), i32 %34)
br label %36
36: ; preds = %33, %31
ret i32 0
}

LLVM IR (-O2):
@.str = [28 x i8] c"Enter the no. of elements: \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [21 x i8] c"Enter the elements: \00"
@.str.3 = [26 x i8] c"Enter an item to search: \00"
@.str.5 = [25 x i8] c"Item found in index: %d\0A\00"
@str = [16 x i8] c"Item not found!\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca [100 x i32]
%3 = alloca i32
%4 = bitcast i32* %1 to i8*
%5 = bitcast [100 x i32]* %2 to i8*
%6 = bitcast i32* %3 to i8*
%7 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([28 x i8], [28 x i8]* @.str, i64 0, i64 0))
%8 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %1)
%9 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([21 x i8], [21 x i8]* @.str.2, i64 0, i64 0))
%10 = load i32, i32* %1
%11 = icmp sgt i32 %10, 0
br i1 %11, label %12, label %20
12: ; preds = %0, %12
%13 = phi i64 [ %16, %12 ], [ 0, %0 ]
%14 = getelementptr inbounds [100 x i32], [100 x i32]* %2, i64 0, i64 %13
%15 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %14)
%16 = add nuw nsw i64 %13, 1
%17 = load i32, i32* %1
%18 = sext i32 %17 to i64
%19 = icmp slt i64 %16, %18
br i1 %19, label %12, label %20
20: ; preds = %12, %0
%21 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([26 x i8], [26 x i8]* @.str.3, i64 0, i64 0))
%22 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %3)
%23 = getelementptr inbounds [100 x i32], [100 x i32]* %2, i64 0, i64 0
%24 = load i32, i32* %1
%25 = load i32, i32* %3
%26 = call i32 @linear_search(i32* %23, i32 %24, i32 %25)
%27 = icmp eq i32 %26, -1
br i1 %27, label %28, label %30
28: ; preds = %20
%29 = call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([16 x i8], [16 x i8]* @str, i64 0, i64 0))
br label %32
30: ; preds = %20
%31 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([25 x i8], [25 x i8]* @.str.5, i64 0, i64 0), i32 %26)
br label %32
32: ; preds = %30, %28
ret i32 0
}