#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() {
  int a = 0;
  int b;
  do {
    printf("How much elements you want:");
    scanf("%d", &b);
  } while (a > b);
  while (a <= b) {
    printf("\n%c -- %d", a, a);
    a++;
  }
  printf("\n");
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x0,-0x8(%rbp)
lea    0xec3(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xed8(%rip),%rdi
lea    -0xc(%rbp),%rsi
call   1040 <scanf@plt>
mov    -0x8(%rbp),%eax
cmp    -0xc(%rbp),%eax
jg     1136 <main+0x16>
jmp    1165 <main+0x45>
mov    -0x8(%rbp),%eax
cmp    -0xc(%rbp),%eax
jg     1193 <main+0x73>
mov    -0x8(%rbp),%esi
mov    -0x8(%rbp),%edx
lea    0xe9e(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x8(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x8(%rbp)
jmp    1165 <main+0x45>
lea    0xe8c(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %rbx
sub    $0x10,%rsp
lea    0xec0(%rip),%r14
lea    0xedc(%rip),%r15
lea    0xc(%rsp),%rbx
nopl   0x0(%rax)
mov    %r14,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %r15,%rdi
mov    %rbx,%rsi
call   1050 <scanf@plt>
cmpl   $0x0,0xc(%rsp)
js     1150 <main+0x20>
mov    $0xffffffff,%ebx
lea    0xea4(%rip),%r14
nopl   0x0(%rax,%rax,1)
add    $0x1,%ebx
mov    %r14,%rdi
mov    %ebx,%esi
mov    %ebx,%edx
xor    %eax,%eax
call   1040 <printf@plt>
cmp    0xc(%rsp),%ebx
jl     1180 <main+0x50>
mov    $0xa,%edi
call   1030 <putchar@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [28 x i8] c"How much elements you want:\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [10 x i8] c"\0A%c -- %d\00"
@.str.3 = [2 x i8] c"\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
store i32 0, i32* %1
store i32 0, i32* %2
br label %4
4: ; preds = %7, %0
%5 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str, i64 0, i64 0))
%6 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %3)
br label %7
7: ; preds = %4
%8 = load i32, i32* %2
%9 = load i32, i32* %3
%10 = icmp sgt i32 %8, %9
br i1 %10, label %4, label %11
11: ; preds = %7
br label %12
12: ; preds = %16, %11
%13 = load i32, i32* %2
%14 = load i32, i32* %3
%15 = icmp sle i32 %13, %14
br i1 %15, label %16, label %22
16: ; preds = %12
%17 = load i32, i32* %2
%18 = load i32, i32* %2
%19 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.2, i64 0, i64 0), i32 %17, i32 %18)
%20 = load i32, i32* %2
%21 = add nsw i32 %20, 1
store i32 %21, i32* %2
br label %12
22: ; preds = %12
%23 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.3, i64 0, i64 0))
ret i32 0
}

LLVM IR (-O2):
@.str = [28 x i8] c"How much elements you want:\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [10 x i8] c"\0A%c -- %d\00"
define i32 @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
br label %3
3: ; preds = %3, %0
%4 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([28 x i8], [28 x i8]* @.str, i64 0, i64 0))
%5 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %1)
%6 = load i32, i32* %1
%7 = icmp slt i32 %6, 0
br i1 %7, label %3, label %8
8: ; preds = %3, %8
%9 = phi i32 [ %11, %8 ], [ 0, %3 ]
%10 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([10 x i8], [10 x i8]* @.str.2, i64 0, i64 0), i32 %9, i32 %9)
%11 = add nuw nsw i32 %9, 1
%12 = load i32, i32* %1
%13 = icmp slt i32 %9, %12
br i1 %13, label %8, label %14
14: ; preds = %8
%15 = call i32 @putchar(i32 10)
ret i32 0
}