#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 hello(int);
int /*<<< orphan*/ printf(char *, ...);
int main() {
  int a, b = 17;
  printf("Hello world!\n");
  a = hello(5);
  for (; a < 15; a++) {
    printf("a = %d\n", a);
  }
  printf("Goodbye world!\n");
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x11,-0xc(%rbp)
lea    0xec3(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    $0x5,%edi
call   1040 <hello@plt>
mov    %eax,-0x8(%rbp)
cmpl   $0xf,-0x8(%rbp)
jge    117a <main+0x5a>
mov    -0x8(%rbp),%esi
lea    0xea9(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x8(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x8(%rbp)
jmp    1151 <main+0x31>
lea    0xe95(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
push   %rax
lea    0xecd(%rip),%rdi
call   1030 <puts@plt>
mov    $0x5,%edi
call   1050 <hello@plt>
cmp    $0xe,%eax
jg     1174 <main+0x44>
mov    %eax,%ebx
lea    0xea8(%rip),%r14
nopl   0x0(%rax,%rax,1)
mov    %r14,%rdi
mov    %ebx,%esi
xor    %eax,%eax
call   1040 <printf@plt>
add    $0x1,%ebx
cmp    $0xf,%ebx
jne    1160 <main+0x30>
lea    0xe9a(%rip),%rdi
call   1030 <puts@plt>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

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

LLVM IR (-O2):
@.str.1 = [8 x i8] c"a = %d\0A\00"
@str = [13 x i8] c"Hello world!\00"
@str.3 = [15 x i8] c"Goodbye world!\00"
define i32 @main() {
%1 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @str, i64 0, i64 0))
%2 = tail call i32 @hello(i32 5)
%3 = icmp slt i32 %2, 15
br i1 %3, label %4, label %9
4: ; preds = %0, %4
%5 = phi i32 [ %7, %4 ], [ %2, %0 ]
%6 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @.str.1, i64 0, i64 0), i32 %5)
%7 = add i32 %5, 1
%8 = icmp eq i32 %7, 15
br i1 %8, label %9, label %4
9: ; preds = %4, %0
%10 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([15 x i8], [15 x i8]* @str.3, i64 0, i64 0))
ret i32 0
}