#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 *, ...);
void main() {
  int a = 8, b = 44;
  while (a < 20) {
    printf("Hello.");
    a += 1;
  }
  printf("\n");
  while (b >= 30) {
    printf("Goodbye %d ", b);
    b -= 2;
  }
  printf("%d\t%d", a, b);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x8,-0x4(%rbp)
movl   $0x2c,-0x8(%rbp)
cmpl   $0x14,-0x4(%rbp)
jge    114c <main+0x3c>
lea    0xec9(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x4(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x4(%rbp)
jmp    1126 <main+0x16>
lea    0xeb4(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
cmpl   $0x1e,-0x8(%rbp)
jl     1183 <main+0x73>
mov    -0x8(%rbp),%esi
lea    0xe9b(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x8(%rbp),%eax
sub    $0x2,%eax
mov    %eax,-0x8(%rbp)
jmp    115a <main+0x4a>
mov    -0x4(%rbp),%esi
mov    -0x8(%rbp),%edx
lea    0xe85(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
lea    0xed8(%rip),%rbx
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    $0xa,%edi
call   1030 <putchar@plt>
lea    0xe56(%rip),%rbx
mov    %rbx,%rdi
mov    $0x2c,%esi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbx,%rdi
mov    $0x2a,%esi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbx,%rdi
mov    $0x28,%esi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbx,%rdi
mov    $0x26,%esi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbx,%rdi
mov    $0x24,%esi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbx,%rdi
mov    $0x22,%esi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbx,%rdi
mov    $0x20,%esi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbx,%rdi
mov    $0x1e,%esi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xde3(%rip),%rdi
mov    $0x14,%esi
mov    $0x1c,%edx
xor    %eax,%eax
pop    %rbx
jmp    1040 <printf@plt>

LLVM IR (-O0):
@.str = [7 x i8] c"Hello.\00"
@.str.1 = [2 x i8] c"\0A\00"
@.str.2 = [12 x i8] c"Goodbye %d \00"
@.str.3 = [6 x i8] c"%d\09%d\00"
define void @main() {
%1 = alloca i32
%2 = alloca i32
store i32 8, i32* %1
store i32 44, i32* %2
br label %3
3: ; preds = %6, %0
%4 = load i32, i32* %1
%5 = icmp slt i32 %4, 20
br i1 %5, label %6, label %10
6: ; preds = %3
%7 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0))
%8 = load i32, i32* %1
%9 = add nsw i32 %8, 1
store i32 %9, i32* %1
br label %3
10: ; preds = %3
%11 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
br label %12
12: ; preds = %15, %10
%13 = load i32, i32* %2
%14 = icmp sge i32 %13, 30
br i1 %14, label %15, label %20
15: ; preds = %12
%16 = load i32, i32* %2
%17 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.2, i64 0, i64 0), i32 %16)
%18 = load i32, i32* %2
%19 = sub nsw i32 %18, 2
store i32 %19, i32* %2
br label %12
20: ; preds = %12
%21 = load i32, i32* %1
%22 = load i32, i32* %2
%23 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.3, i64 0, i64 0), i32 %21, i32 %22)
ret void
}

LLVM IR (-O2):
@.str = [7 x i8] c"Hello.\00"
@.str.2 = [12 x i8] c"Goodbye %d \00"
@.str.3 = [6 x i8] c"%d\09%d\00"
define void @main() {
%1 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0))
%2 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0))
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0))
%4 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0))
%5 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0))
%6 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0))
%7 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0))
%8 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0))
%9 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0))
%10 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0))
%11 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0))
%12 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0))
%13 = tail call i32 @putchar(i32 10)
%14 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([12 x i8], [12 x i8]* @.str.2, i64 0, i64 0), i32 44)
%15 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([12 x i8], [12 x i8]* @.str.2, i64 0, i64 0), i32 42)
%16 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([12 x i8], [12 x i8]* @.str.2, i64 0, i64 0), i32 40)
%17 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([12 x i8], [12 x i8]* @.str.2, i64 0, i64 0), i32 38)
%18 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([12 x i8], [12 x i8]* @.str.2, i64 0, i64 0), i32 36)
%19 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([12 x i8], [12 x i8]* @.str.2, i64 0, i64 0), i32 34)
%20 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([12 x i8], [12 x i8]* @.str.2, i64 0, i64 0), i32 32)
%21 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([12 x i8], [12 x i8]* @.str.2, i64 0, i64 0), i32 30)
%22 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([6 x i8], [6 x i8]* @.str.3, i64 0, i64 0), i32 20, i32 28)
ret void
}