#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*/ merge_sort_up2down(int *, int /*<<< orphan*/, int);
int /*<<< orphan*/ printf(char *, ...);
void main() {
  int i;
  int a[] = {80, 30, 60, 40, 20, 10, 50, 70};
  int ilen = ((sizeof(a)) / (sizeof(a[0])));
  printf("before sort:");
  for (i = 0; i < ilen; i++)
    printf("%d ", a[i]);
  printf("\n");
  merge_sort_up2down(a, 0, ilen - 1);
  printf("after  sort:");
  for (i = 0; i < ilen; i++)
    printf("%d ", a[i]);
  printf("\n");
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x40,%rsp
mov    0xed1(%rip),%rax
mov    %rax,-0x30(%rbp)
mov    0xece(%rip),%rax
mov    %rax,-0x28(%rbp)
mov    0xecb(%rip),%rax
mov    %rax,-0x20(%rbp)
mov    0xec8(%rip),%rax
mov    %rax,-0x18(%rbp)
movl   $0x8,-0x34(%rbp)
lea    0xebe(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
cmp    -0x34(%rbp),%eax
jge    11a0 <main+0x80>
movslq -0x4(%rbp),%rax
mov    -0x30(%rbp,%rax,4),%esi
lea    0xea2(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x4(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x4(%rbp)
jmp    1170 <main+0x50>
lea    0xe8a(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    -0x30(%rbp),%rdi
mov    -0x34(%rbp),%edx
sub    $0x1,%edx
xor    %esi,%esi
call   1040 <merge_sort_up2down@plt>
lea    0xe6d(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
cmp    -0x34(%rbp),%eax
jge    1204 <main+0xe4>
movslq -0x4(%rbp),%rax
mov    -0x30(%rbp,%rax,4),%esi
lea    0xe3e(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x4(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x4(%rbp)
jmp    11d4 <main+0xb4>
lea    0xe26(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x40,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x20,%rsp
movaps 0xed4(%rip),%xmm0
movaps %xmm0,0x10(%rsp)
movaps 0xeb8(%rip),%xmm0
movaps %xmm0,(%rsp)
lea    0xecd(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xecc(%rip),%rbx
mov    %rbx,%rdi
mov    $0x50,%esi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbx,%rdi
mov    $0x1e,%esi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbx,%rdi
mov    $0x3c,%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    $0x14,%esi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbx,%rdi
mov    $0xa,%esi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbx,%rdi
mov    $0x32,%esi
xor    %eax,%eax
call   1040 <printf@plt>
mov    %rbx,%rdi
mov    $0x46,%esi
xor    %eax,%eax
call   1040 <printf@plt>
mov    $0xa,%edi
call   1030 <putchar@plt>
mov    %rsp,%rdi
xor    %esi,%esi
mov    $0x7,%edx
call   1050 <merge_sort_up2down@plt>
lea    0xe38(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    (%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0x4(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0x8(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0xc(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0x10(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0x14(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0x18(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0x1c(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    $0xa,%edi
call   1030 <putchar@plt>
add    $0x20,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@__const.main.a = [8 x i32] [i32 80, i32 30, i32 60, i32 40, i32 20, i32 10, i32 50, i32 70]
@.str = [13 x i8] c"before sort:\00"
@.str.1 = [4 x i8] c"%d \00"
@.str.2 = [2 x i8] c"\0A\00"
@.str.3 = [13 x i8] c"after sort:\00"
define void @main() {
%1 = alloca i32
%2 = alloca [8 x i32]
%3 = alloca i32
%4 = bitcast [8 x i32]* %2 to i8*
store i32 8, i32* %3
%5 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str, i64 0, i64 0))
store i32 0, i32* %1
br label %6
6: ; preds = %16, %0
%7 = load i32, i32* %1
%8 = load i32, i32* %3
%9 = icmp slt i32 %7, %8
br i1 %9, label %10, label %19
10: ; preds = %6
%11 = load i32, i32* %1
%12 = sext i32 %11 to i64
%13 = getelementptr inbounds [8 x i32], [8 x i32]* %2, i64 0, i64 %12
%14 = load i32, i32* %13
%15 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %14)
br label %16
16: ; preds = %10
%17 = load i32, i32* %1
%18 = add nsw i32 %17, 1
store i32 %18, i32* %1
br label %6
19: ; preds = %6
%20 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0))
%21 = getelementptr inbounds [8 x i32], [8 x i32]* %2, i64 0, i64 0
%22 = load i32, i32* %3
%23 = sub nsw i32 %22, 1
%24 = call i32 @merge_sort_up2down(i32* %21, i32 0, i32 %23)
%25 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.3, i64 0, i64 0))
store i32 0, i32* %1
br label %26
26: ; preds = %36, %19
%27 = load i32, i32* %1
%28 = load i32, i32* %3
%29 = icmp slt i32 %27, %28
br i1 %29, label %30, label %39
30: ; preds = %26
%31 = load i32, i32* %1
%32 = sext i32 %31 to i64
%33 = getelementptr inbounds [8 x i32], [8 x i32]* %2, i64 0, i64 %32
%34 = load i32, i32* %33
%35 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %34)
br label %36
36: ; preds = %30
%37 = load i32, i32* %1
%38 = add nsw i32 %37, 1
store i32 %38, i32* %1
br label %26
39: ; preds = %26
%40 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0))
ret void
}

LLVM IR (-O2):
@__const.main.a = [8 x i32] [i32 80, i32 30, i32 60, i32 40, i32 20, i32 10, i32 50, i32 70]
@.str = [13 x i8] c"before sort:\00"
@.str.1 = [4 x i8] c"%d \00"
@.str.3 = [13 x i8] c"after sort:\00"
define void @main() {
%1 = alloca [8 x i32]
%2 = bitcast [8 x i32]* %1 to i8*
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @.str, i64 0, i64 0))
%4 = getelementptr inbounds [8 x i32], [8 x i32]* %1, i64 0, i64 0
%5 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 80)
%6 = getelementptr inbounds [8 x i32], [8 x i32]* %1, i64 0, i64 1
%7 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 30)
%8 = getelementptr inbounds [8 x i32], [8 x i32]* %1, i64 0, i64 2
%9 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 60)
%10 = getelementptr inbounds [8 x i32], [8 x i32]* %1, i64 0, i64 3
%11 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 40)
%12 = getelementptr inbounds [8 x i32], [8 x i32]* %1, i64 0, i64 4
%13 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 20)
%14 = getelementptr inbounds [8 x i32], [8 x i32]* %1, i64 0, i64 5
%15 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 10)
%16 = getelementptr inbounds [8 x i32], [8 x i32]* %1, i64 0, i64 6
%17 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 50)
%18 = getelementptr inbounds [8 x i32], [8 x i32]* %1, i64 0, i64 7
%19 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 70)
%20 = tail call i32 @putchar(i32 10)
%21 = call i32 @merge_sort_up2down(i32* %4, i32 0, i32 7)
%22 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([13 x i8], [13 x i8]* @.str.3, i64 0, i64 0))
%23 = load i32, i32* %4
%24 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %23)
%25 = load i32, i32* %6
%26 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %25)
%27 = load i32, i32* %8
%28 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %27)
%29 = load i32, i32* %10
%30 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %29)
%31 = load i32, i32* %12
%32 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %31)
%33 = load i32, i32* %14
%34 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %33)
%35 = load i32, i32* %16
%36 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %35)
%37 = load i32, i32* %18
%38 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %37)
%39 = call i32 @putchar(i32 10)
ret void
}