#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*/ merge(int *, int, int, int, int);
int /*<<< orphan*/ sort(int *, int, int);
void mergeSort(int array[], int start, int end) {
  if (end > start) {
    int middle = (start + end) / 2;
    sort(array, start, middle);
    sort(array, middle + 1, end);
    merge(array, start, middle, middle + 1, end);
  }
}


x86 assembly (clang, -O0):
<mergeSort>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %esi,-0xc(%rbp)
mov    %edx,-0x10(%rbp)
mov    -0x10(%rbp),%eax
cmp    -0xc(%rbp),%eax
jle    1189 <mergeSort+0x69>
mov    -0xc(%rbp),%eax
add    -0x10(%rbp),%eax
mov    $0x2,%ecx
cltd
idiv   %ecx
mov    %eax,-0x14(%rbp)
mov    -0x8(%rbp),%rdi
mov    -0xc(%rbp),%esi
mov    -0x14(%rbp),%edx
call   1030 <sort@plt>
mov    -0x8(%rbp),%rdi
mov    -0x14(%rbp),%esi
add    $0x1,%esi
mov    -0x10(%rbp),%edx
call   1030 <sort@plt>
mov    -0x8(%rbp),%rdi
mov    -0xc(%rbp),%esi
mov    -0x14(%rbp),%edx
mov    -0x14(%rbp),%ecx
add    $0x1,%ecx
mov    -0x10(%rbp),%r8d
call   1040 <merge@plt>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<mergeSort>:
cmp    %esi,%edx
jle    1173 <mergeSort+0x53>
push   %rbp
push   %r15
push   %r14
push   %r12
push   %rbx
mov    %edx,%r14d
mov    %esi,%r12d
mov    %rdi,%r15
lea    (%r14,%r12,1),%eax
mov    %eax,%ebx
shr    $0x1f,%ebx
add    %eax,%ebx
sar    %ebx
mov    %ebx,%edx
call   1030 <sort@plt>
lea    0x1(%rbx),%ebp
mov    %r15,%rdi
mov    %ebp,%esi
mov    %r14d,%edx
call   1030 <sort@plt>
mov    %r15,%rdi
mov    %r12d,%esi
mov    %ebx,%edx
mov    %ebp,%ecx
mov    %r14d,%r8d
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
pop    %rbp
jmp    1040 <merge@plt>
ret

LLVM IR (-O0):
define void @mergeSort(i32* %0, i32 %1, i32 %2) {
%4 = alloca i32*
%5 = alloca i32
%6 = alloca i32
%7 = alloca i32
store i32* %0, i32** %4
store i32 %1, i32* %5
store i32 %2, i32* %6
%8 = load i32, i32* %6
%9 = load i32, i32* %5
%10 = icmp sgt i32 %8, %9
br i1 %10, label %11, label %32
11: ; preds = %3
%12 = load i32, i32* %5
%13 = load i32, i32* %6
%14 = add nsw i32 %12, %13
%15 = sdiv i32 %14, 2
store i32 %15, i32* %7
%16 = load i32*, i32** %4
%17 = load i32, i32* %5
%18 = load i32, i32* %7
%19 = call i32 @sort(i32* %16, i32 %17, i32 %18)
%20 = load i32*, i32** %4
%21 = load i32, i32* %7
%22 = add nsw i32 %21, 1
%23 = load i32, i32* %6
%24 = call i32 @sort(i32* %20, i32 %22, i32 %23)
%25 = load i32*, i32** %4
%26 = load i32, i32* %5
%27 = load i32, i32* %7
%28 = load i32, i32* %7
%29 = add nsw i32 %28, 1
%30 = load i32, i32* %6
%31 = call i32 @merge(i32* %25, i32 %26, i32 %27, i32 %29, i32 %30)
br label %32
32: ; preds = %11, %3
ret void
}

LLVM IR (-O2):
define void @mergeSort(i32* %0, i32 %1, i32 %2) {
%4 = icmp sgt i32 %2, %1
br i1 %4, label %5, label %12
5: ; preds = %3
%6 = add nsw i32 %2, %1
%7 = sdiv i32 %6, 2
%8 = tail call i32 @sort(i32* %0, i32 %1, i32 %7)
%9 = add nsw i32 %7, 1
%10 = tail call i32 @sort(i32* %0, i32 %9, i32 %2)
%11 = tail call i32 @merge(i32* %0, i32 %1, i32 %7, i32 %9, i32 %2)
br label %12
12: ; preds = %5, %3
ret void
}