#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 *);
int main(void) {
  int n;
  printf("How many numbers do you want to reverse? ");
  scanf("%d", &n);
  int a[n];
  printf("Enter %d numbers: ", n);
  for (int i = 0; i < n; i += 1) {
    scanf("%d", &a[i]);
  }
  printf("In reverse order: ");
  for (int i = n - 1; i >= 0; i -= 1) {
    printf(" %d", a[i]);
  }
  printf("\n");
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeca(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xf0d(%rip),%rdi
lea    -0x8(%rbp),%rsi
call   1040 <scanf@plt>
mov    -0x8(%rbp),%eax
mov    %rsp,%rcx
mov    %rcx,-0x10(%rbp)
lea    0xf(,%rax,4),%rdx
and    $0xfffffffffffffff0,%rdx
mov    %rsp,%rcx
sub    %rdx,%rcx
mov    %rcx,-0x28(%rbp)
mov    %rcx,%rsp
mov    %rax,-0x18(%rbp)
mov    -0x8(%rbp),%esi
lea    0xeac(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0x0,-0x1c(%rbp)
mov    -0x1c(%rbp),%eax
cmp    -0x8(%rbp),%eax
jge    11c1 <main+0xa1>
mov    -0x28(%rbp),%rsi
movslq -0x1c(%rbp),%rax
shl    $0x2,%rax
add    %rax,%rsi
lea    0xea3(%rip),%rdi
call   1040 <scanf@plt>
mov    -0x1c(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x1c(%rbp)
jmp    118c <main+0x6c>
lea    0xe75(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x8(%rbp),%eax
sub    $0x1,%eax
mov    %eax,-0x20(%rbp)
cmpl   $0x0,-0x20(%rbp)
jl     1209 <main+0xe9>
mov    -0x28(%rbp),%rax
movslq -0x20(%rbp),%rcx
mov    (%rax,%rcx,4),%esi
lea    0xe5c(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x20(%rbp),%eax
sub    $0x1,%eax
mov    %eax,-0x20(%rbp)
jmp    11d8 <main+0xb8>
lea    0xe44(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x10(%rbp),%rax
mov    %rax,%rsp
mov    -0x4(%rbp),%eax
mov    %rbp,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
mov    %rsp,%rbp
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
push   %rax
lea    0xebb(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xefe(%rip),%rdi
lea    -0x2c(%rbp),%rsi
call   1050 <scanf@plt>
mov    %rsp,%r15
mov    -0x2c(%rbp),%eax
mov    %rsp,%r12
lea    0xf(,%rax,4),%rax
and    $0xfffffffffffffff0,%rax
sub    %rax,%r12
mov    %r12,%rsp
mov    -0x2c(%rbp),%esi
lea    0xea9(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
cmpl   $0x0,-0x2c(%rbp)
jle    11bc <main+0x8c>
xor    %r13d,%r13d
lea    0xeb9(%rip),%r14
mov    %r12,%rbx
nopl   0x0(%rax,%rax,1)
mov    %r14,%rdi
mov    %rbx,%rsi
call   1050 <scanf@plt>
add    $0x1,%r13
movslq -0x2c(%rbp),%rax
add    $0x4,%rbx
cmp    %rax,%r13
jl     11a0 <main+0x70>
lea    0xe7a(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    -0x2c(%rbp),%ebx
test   %ebx,%ebx
jle    11fb <main+0xcb>
add    $0x1,%rbx
lea    0xe74(%rip),%r14
nopl   0x0(%rax)
lea    -0x2(%rbx),%eax
mov    (%r12,%rax,4),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
add    $0xffffffffffffffff,%rbx
cmp    $0x1,%rbx
ja     11e0 <main+0xb0>
mov    $0xa,%edi
call   1030 <putchar@plt>
mov    %r15,%rsp
xor    %eax,%eax
lea    -0x28(%rbp),%rsp
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
@.str = [42 x i8] c"How many numbers do you want to reverse? \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [19 x i8] c"Enter %d numbers: \00"
@.str.3 = [19 x i8] c"In reverse order: \00"
@.str.4 = [4 x i8] c" %d\00"
@.str.5 = [2 x i8] c"\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i8*
%4 = alloca i64
%5 = alloca i32
%6 = alloca i32
store i32 0, i32* %1
%7 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([42 x i8], [42 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* %2)
%9 = load i32, i32* %2
%10 = zext i32 %9 to i64
%11 = call i8* @llvm.stacksave()
store i8* %11, i8** %3
%12 = alloca i32, i64 %10
store i64 %10, i64* %4
%13 = load i32, i32* %2
%14 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.2, i64 0, i64 0), i32 %13)
store i32 0, i32* %5
br label %15
15: ; preds = %24, %0
%16 = load i32, i32* %5
%17 = load i32, i32* %2
%18 = icmp slt i32 %16, %17
br i1 %18, label %19, label %27
19: ; preds = %15
%20 = load i32, i32* %5
%21 = sext i32 %20 to i64
%22 = getelementptr inbounds i32, i32* %12, i64 %21
%23 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %22)
br label %24
24: ; preds = %19
%25 = load i32, i32* %5
%26 = add nsw i32 %25, 1
store i32 %26, i32* %5
br label %15
27: ; preds = %15
%28 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str.3, i64 0, i64 0))
%29 = load i32, i32* %2
%30 = sub nsw i32 %29, 1
store i32 %30, i32* %6
br label %31
31: ; preds = %40, %27
%32 = load i32, i32* %6
%33 = icmp sge i32 %32, 0
br i1 %33, label %34, label %43
34: ; preds = %31
%35 = load i32, i32* %6
%36 = sext i32 %35 to i64
%37 = getelementptr inbounds i32, i32* %12, i64 %36
%38 = load i32, i32* %37
%39 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.4, i64 0, i64 0), i32 %38)
br label %40
40: ; preds = %34
%41 = load i32, i32* %6
%42 = sub nsw i32 %41, 1
store i32 %42, i32* %6
br label %31
43: ; preds = %31
%44 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.5, i64 0, i64 0))
store i32 0, i32* %1
%45 = load i8*, i8** %3
%46 = load i32, i32* %1
ret i32 %46
}

LLVM IR (-O2):
@.str = [42 x i8] c"How many numbers do you want to reverse? \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [19 x i8] c"Enter %d numbers: \00"
@.str.3 = [19 x i8] c"In reverse order: \00"
@.str.4 = [4 x i8] c" %d\00"
define i32 @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([42 x i8], [42 x i8]* @.str, i64 0, i64 0))
%4 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %1)
%5 = load i32, i32* %1
%6 = zext i32 %5 to i64
%7 = call i8* @llvm.stacksave()
%8 = alloca i32, i64 %6
%9 = load i32, i32* %1
%10 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([19 x i8], [19 x i8]* @.str.2, i64 0, i64 0), i32 %9)
%11 = load i32, i32* %1
%12 = icmp sgt i32 %11, 0
br i1 %12, label %19, label %13
13: ; preds = %19, %0
%14 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([19 x i8], [19 x i8]* @.str.3, i64 0, i64 0))
%15 = load i32, i32* %1
%16 = icmp sgt i32 %15, 0
br i1 %16, label %17, label %27
17: ; preds = %13
%18 = zext i32 %15 to i64
br label %29
19: ; preds = %0, %19
%20 = phi i64 [ %23, %19 ], [ 0, %0 ]
%21 = getelementptr inbounds i32, i32* %8, i64 %20
%22 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %21)
%23 = add nuw nsw i64 %20, 1
%24 = load i32, i32* %1
%25 = sext i32 %24 to i64
%26 = icmp slt i64 %23, %25
br i1 %26, label %19, label %13
27: ; preds = %29, %13
%28 = call i32 @putchar(i32 10)
ret i32 0
29: ; preds = %17, %29
%30 = phi i64 [ %18, %17 ], [ %31, %29 ]
%31 = add nsw i64 %30, -1
%32 = and i64 %31, 4294967295
%33 = getelementptr inbounds i32, i32* %8, i64 %32
%34 = load i32, i32* %33
%35 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.4, i64 0, i64 0), i32 %34)
%36 = icmp ugt i64 %30, 1
br i1 %36, label %29, label %27
}