#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 */
typedef int /*<<< orphan*/ a;

/* Variables and functions */
int /*<<< orphan*/ heapsort(int *, int);
int /*<<< orphan*/ printf(char *, int);
void main() {
  int len, i;
  int a[] = {7, 2, 1, 5, 6, 9};
  len = sizeof(a) / sizeof(int);
  heapsort(a, len - 1);
  for (i = 0; i < len; i++)
    printf("%d\n", a[i]);
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    0xed1(%rip),%rax
mov    %rax,-0x20(%rbp)
mov    0xece(%rip),%rax
mov    %rax,-0x18(%rbp)
mov    0xecb(%rip),%rax
mov    %rax,-0x10(%rbp)
movl   $0x6,-0x4(%rbp)
lea    -0x20(%rbp),%rdi
mov    -0x4(%rbp),%esi
sub    $0x1,%esi
call   1040 <heapsort@plt>
movl   $0x0,-0x8(%rbp)
mov    -0x8(%rbp),%eax
cmp    -0x4(%rbp),%eax
jge    1194 <main+0x74>
movslq -0x8(%rbp),%rax
mov    -0x20(%rbp,%rax,4),%esi
lea    0xe97(%rip),%rdi
call   1030 <printf@plt>
mov    -0x8(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x8(%rbp)
jmp    1166 <main+0x46>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x20,%rsp
mov    0xee4(%rip),%rax
mov    %rax,0x10(%rsp)
movaps 0xec8(%rip),%xmm0
movaps %xmm0,(%rsp)
mov    %rsp,%rdi
mov    $0x5,%esi
call   1040 <heapsort@plt>
mov    (%rsp),%esi
lea    0xec5(%rip),%rbx
mov    %rbx,%rdi
call   1030 <printf@plt>
mov    0x4(%rsp),%esi
mov    %rbx,%rdi
call   1030 <printf@plt>
mov    0x8(%rsp),%esi
mov    %rbx,%rdi
call   1030 <printf@plt>
mov    0xc(%rsp),%esi
mov    %rbx,%rdi
call   1030 <printf@plt>
mov    0x10(%rsp),%esi
mov    %rbx,%rdi
call   1030 <printf@plt>
mov    0x14(%rsp),%esi
mov    %rbx,%rdi
call   1030 <printf@plt>
add    $0x20,%rsp
pop    %rbx
ret

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

LLVM IR (-O2):
@__const.main.a = [6 x i32] [i32 7, i32 2, i32 1, i32 5, i32 6, i32 9]
@.str = [4 x i8] c"%d\0A\00"
define void @main() {
%1 = alloca [6 x i32]
%2 = bitcast [6 x i32]* %1 to i8*
%3 = getelementptr inbounds [6 x i32], [6 x i32]* %1, i64 0, i64 0
%4 = call i32 @heapsort(i32* %3, i32 5)
%5 = load i32, i32* %3
%6 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %5)
%7 = getelementptr inbounds [6 x i32], [6 x i32]* %1, i64 0, i64 1
%8 = load i32, i32* %7
%9 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %8)
%10 = getelementptr inbounds [6 x i32], [6 x i32]* %1, i64 0, i64 2
%11 = load i32, i32* %10
%12 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %11)
%13 = getelementptr inbounds [6 x i32], [6 x i32]* %1, i64 0, i64 3
%14 = load i32, i32* %13
%15 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %14)
%16 = getelementptr inbounds [6 x i32], [6 x i32]* %1, i64 0, i64 4
%17 = load i32, i32* %16
%18 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %17)
%19 = getelementptr inbounds [6 x i32], [6 x i32]* %1, i64 0, i64 5
%20 = load i32, i32* %19
%21 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %20)
ret void
}