#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 *, int *);
void scan_for_loop(void) {
  int x[4];
  printf("Enter 4 digits separated by spaces >\n");
  int i;
  for (i = 0; i < 4; ++i) {
    scanf("%d", &x[i]);
  }
  printf("\n");
  for (i = 0; i < 4; ++i) {
    printf("x[%d] = %d\n", i, x[i]);
  }
}


x86 assembly (clang, -O0):
<scan_for_loop>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
lea    0xed1(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0x0,-0x14(%rbp)
cmpl   $0x4,-0x14(%rbp)
jge    1170 <scan_for_loop+0x50>
movslq -0x14(%rbp),%rax
lea    -0x10(%rbp),%rsi
shl    $0x2,%rax
add    %rax,%rsi
lea    0xec9(%rip),%rdi
call   1040 <scanf@plt>
mov    -0x14(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
jmp    113d <scan_for_loop+0x1d>
lea    0xead(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0x0,-0x14(%rbp)
cmpl   $0x4,-0x14(%rbp)
jge    11b6 <scan_for_loop+0x96>
mov    -0x14(%rbp),%esi
movslq -0x14(%rbp),%rax
mov    -0x10(%rbp,%rax,4),%edx
lea    0xe88(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x14(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
jmp    1185 <scan_for_loop+0x65>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<scan_for_loop>:
push   %rbx
sub    $0x10,%rsp
lea    0xec3(%rip),%rdi
call   1040 <puts@plt>
lea    0xea8(%rip),%rbx
mov    %rsp,%rsi
mov    %rbx,%rdi
call   1060 <scanf@plt>
lea    0x4(%rsp),%rsi
mov    %rbx,%rdi
call   1060 <scanf@plt>
lea    0x8(%rsp),%rsi
mov    %rbx,%rdi
call   1060 <scanf@plt>
lea    0xc(%rsp),%rsi
mov    %rbx,%rdi
call   1060 <scanf@plt>
mov    $0xa,%edi
call   1030 <putchar@plt>
mov    (%rsp),%edx
lea    0xe65(%rip),%rbx
mov    %rbx,%rdi
xor    %esi,%esi
xor    %eax,%eax
call   1050 <printf@plt>
mov    0x4(%rsp),%edx
mov    %rbx,%rdi
mov    $0x1,%esi
xor    %eax,%eax
call   1050 <printf@plt>
mov    0x8(%rsp),%edx
mov    %rbx,%rdi
mov    $0x2,%esi
xor    %eax,%eax
call   1050 <printf@plt>
mov    0xc(%rsp),%edx
mov    %rbx,%rdi
mov    $0x3,%esi
xor    %eax,%eax
call   1050 <printf@plt>
add    $0x10,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@.str = [38 x i8] c"Enter 4 digits separated by spaces >\0A\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [2 x i8] c"\0A\00"
@.str.3 = [12 x i8] c"x[%d] = %d\0A\00"
define void @scan_for_loop() {
%1 = alloca [4 x i32]
%2 = alloca i32
%3 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([38 x i8], [38 x i8]* @.str, i64 0, i64 0))
store i32 0, i32* %2
br label %4
4: ; preds = %12, %0
%5 = load i32, i32* %2
%6 = icmp slt i32 %5, 4
br i1 %6, label %7, label %15
7: ; preds = %4
%8 = load i32, i32* %2
%9 = sext i32 %8 to i64
%10 = getelementptr inbounds [4 x i32], [4 x i32]* %1, i64 0, i64 %9
%11 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %10)
br label %12
12: ; preds = %7
%13 = load i32, i32* %2
%14 = add nsw i32 %13, 1
store i32 %14, i32* %2
br label %4
15: ; preds = %4
%16 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0))
store i32 0, i32* %2
br label %17
17: ; preds = %27, %15
%18 = load i32, i32* %2
%19 = icmp slt i32 %18, 4
br i1 %19, label %20, label %30
20: ; preds = %17
%21 = load i32, i32* %2
%22 = load i32, i32* %2
%23 = sext i32 %22 to i64
%24 = getelementptr inbounds [4 x i32], [4 x i32]* %1, i64 0, i64 %23
%25 = load i32, i32* %24
%26 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.3, i64 0, i64 0), i32 %21, i32 %25)
br label %27
27: ; preds = %20
%28 = load i32, i32* %2
%29 = add nsw i32 %28, 1
store i32 %29, i32* %2
br label %17
30: ; preds = %17
ret void
}

LLVM IR (-O2):
@.str.1 = [3 x i8] c"%d\00"
@.str.3 = [12 x i8] c"x[%d] = %d\0A\00"
@str = [37 x i8] c"Enter 4 digits separated by spaces >\00"
define void @scan_for_loop() {
%1 = alloca [4 x i32]
%2 = bitcast [4 x i32]* %1 to i8*
%3 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([37 x i8], [37 x i8]* @str, i64 0, i64 0))
%4 = getelementptr inbounds [4 x i32], [4 x i32]* %1, i64 0, i64 0
%5 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %4)
%6 = getelementptr inbounds [4 x i32], [4 x i32]* %1, i64 0, i64 1
%7 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %6)
%8 = getelementptr inbounds [4 x i32], [4 x i32]* %1, i64 0, i64 2
%9 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %8)
%10 = getelementptr inbounds [4 x i32], [4 x i32]* %1, i64 0, i64 3
%11 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %10)
%12 = call i32 @putchar(i32 10)
%13 = load i32, i32* %4
%14 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([12 x i8], [12 x i8]* @.str.3, i64 0, i64 0), i32 0, i32 %13)
%15 = load i32, i32* %6
%16 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([12 x i8], [12 x i8]* @.str.3, i64 0, i64 0), i32 1, i32 %15)
%17 = load i32, i32* %8
%18 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([12 x i8], [12 x i8]* @.str.3, i64 0, i64 0), i32 2, i32 %17)
%19 = load i32, i32* %10
%20 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([12 x i8], [12 x i8]* @.str.3, i64 0, i64 0), i32 3, i32 %19)
ret void
}