#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_sort(int *, int /*<<< orphan*/, int);
int /*<<< orphan*/ printf(char *, ...);
int rand();
int /*<<< orphan*/ srand(int /*<<< orphan*/);
int /*<<< orphan*/ time(int /*<<< orphan*/ *);
int main(int argc, char **argv) {
  int a[20];
  srand(time(NULL));
  int i;
  for (i = 0; i < 20; i++) {
    a[i] = rand() % (1000 - 0) + 0;
    printf("%d ", a[i]);
  }
  printf("\n");
  merge_sort(a, 0, 20 - 1);
  for (i = 0; i < 20; i++) {
    printf("%d ", a[i]);
  }
  printf("\n");
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x70,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
xor    %eax,%eax
mov    %eax,%edi
call   1050 <time@plt>
mov    %eax,%edi
call   1040 <srand@plt>
movl   $0x0,-0x64(%rbp)
cmpl   $0x14,-0x64(%rbp)
jge    11c5 <main+0x75>
mov    $0x0,%al
call   1070 <rand@plt>
mov    $0x3e8,%ecx
cltd
idiv   %ecx
add    $0x0,%edx
movslq -0x64(%rbp),%rax
mov    %edx,-0x60(%rbp,%rax,4)
movslq -0x64(%rbp),%rax
mov    -0x60(%rbp,%rax,4),%esi
lea    0xe50(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x64(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x64(%rbp)
jmp    117d <main+0x2d>
lea    0xe38(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    -0x60(%rbp),%rdi
xor    %esi,%esi
mov    $0x13,%edx
call   1060 <merge_sort@plt>
movl   $0x0,-0x64(%rbp)
cmpl   $0x14,-0x64(%rbp)
jge    1218 <main+0xc8>
movslq -0x64(%rbp),%rax
mov    -0x60(%rbp,%rax,4),%esi
lea    0xdfd(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x64(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x64(%rbp)
jmp    11ea <main+0x9a>
lea    0xde5(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x70,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
sub    $0x58,%rsp
xor    %edi,%edi
call   1060 <time@plt>
mov    %eax,%edi
call   1050 <srand@plt>
lea    0xe84(%rip),%r14
xor    %ebx,%ebx
xchg   %ax,%ax
xor    %eax,%eax
call   1080 <rand@plt>
movslq %eax,%rsi
imul   $0x10624dd3,%rsi,%rax
mov    %rax,%rcx
shr    $0x3f,%rcx
sar    $0x26,%rax
add    %ecx,%eax
imul   $0x3e8,%eax,%eax
sub    %eax,%esi
mov    %esi,(%rsp,%rbx,4)
mov    %r14,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
add    $0x1,%rbx
cmp    $0x14,%rbx
jne    1180 <main+0x20>
mov    $0xa,%edi
call   1030 <putchar@plt>
mov    %rsp,%rdi
xor    %esi,%esi
mov    $0x13,%edx
call   1070 <merge_sort@plt>
mov    (%rsp),%esi
lea    0xe20(%rip),%rbx
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    0x20(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0x24(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0x28(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0x2c(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0x30(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0x34(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0x38(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0x3c(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0x40(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0x44(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0x48(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0x4c(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1040 <printf@plt>
mov    $0xa,%edi
call   1030 <putchar@plt>
xor    %eax,%eax
add    $0x58,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [4 x i8] c"%d \00"
@.str.1 = [2 x i8] c"\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca [20 x i32]
%7 = alloca i32
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%8 = call i32 @time(i32* null)
%9 = call i32 @srand(i32 %8)
store i32 0, i32* %7
br label %10
10: ; preds = %25, %2
%11 = load i32, i32* %7
%12 = icmp slt i32 %11, 20
br i1 %12, label %13, label %28
13: ; preds = %10
%14 = call i32 (...) @rand()
%15 = srem i32 %14, 1000
%16 = add nsw i32 %15, 0
%17 = load i32, i32* %7
%18 = sext i32 %17 to i64
%19 = getelementptr inbounds [20 x i32], [20 x i32]* %6, i64 0, i64 %18
store i32 %16, i32* %19
%20 = load i32, i32* %7
%21 = sext i32 %20 to i64
%22 = getelementptr inbounds [20 x i32], [20 x i32]* %6, i64 0, i64 %21
%23 = load i32, i32* %22
%24 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %23)
br label %25
25: ; preds = %13
%26 = load i32, i32* %7
%27 = add nsw i32 %26, 1
store i32 %27, i32* %7
br label %10
28: ; preds = %10
%29 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
%30 = getelementptr inbounds [20 x i32], [20 x i32]* %6, i64 0, i64 0
%31 = call i32 @merge_sort(i32* %30, i32 0, i32 19)
store i32 0, i32* %7
br label %32
32: ; preds = %41, %28
%33 = load i32, i32* %7
%34 = icmp slt i32 %33, 20
br i1 %34, label %35, label %44
35: ; preds = %32
%36 = load i32, i32* %7
%37 = sext i32 %36 to i64
%38 = getelementptr inbounds [20 x i32], [20 x i32]* %6, i64 0, i64 %37
%39 = load i32, i32* %38
%40 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %39)
br label %41
41: ; preds = %35
%42 = load i32, i32* %7
%43 = add nsw i32 %42, 1
store i32 %43, i32* %7
br label %32
44: ; preds = %32
%45 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
ret i32 0
}

LLVM IR (-O2):
@.str = [4 x i8] c"%d \00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = alloca [20 x i32]
%4 = bitcast [20 x i32]* %3 to i8*
%5 = tail call i32 @time(i32* null)
%6 = tail call i32 @srand(i32 %5)
br label %7
7: ; preds = %2, %7
%8 = phi i64 [ 0, %2 ], [ %13, %7 ]
%9 = tail call i32 (...) @rand()
%10 = srem i32 %9, 1000
%11 = getelementptr inbounds [20 x i32], [20 x i32]* %3, i64 0, i64 %8
store i32 %10, i32* %11
%12 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %10)
%13 = add nuw nsw i64 %8, 1
%14 = icmp eq i64 %13, 20
br i1 %14, label %15, label %7
15: ; preds = %7
%16 = tail call i32 @putchar(i32 10)
%17 = getelementptr inbounds [20 x i32], [20 x i32]* %3, i64 0, i64 0
%18 = call i32 @merge_sort(i32* %17, i32 0, i32 19)
%19 = load i32, i32* %17
%20 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %19)
%21 = getelementptr inbounds [20 x i32], [20 x i32]* %3, i64 0, i64 1
%22 = load i32, i32* %21
%23 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %22)
%24 = getelementptr inbounds [20 x i32], [20 x i32]* %3, i64 0, i64 2
%25 = load i32, i32* %24
%26 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %25)
%27 = getelementptr inbounds [20 x i32], [20 x i32]* %3, i64 0, i64 3
%28 = load i32, i32* %27
%29 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %28)
%30 = getelementptr inbounds [20 x i32], [20 x i32]* %3, i64 0, i64 4
%31 = load i32, i32* %30
%32 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %31)
%33 = getelementptr inbounds [20 x i32], [20 x i32]* %3, i64 0, i64 5
%34 = load i32, i32* %33
%35 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %34)
%36 = getelementptr inbounds [20 x i32], [20 x i32]* %3, i64 0, i64 6
%37 = load i32, i32* %36
%38 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %37)
%39 = getelementptr inbounds [20 x i32], [20 x i32]* %3, i64 0, i64 7
%40 = load i32, i32* %39
%41 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %40)
%42 = getelementptr inbounds [20 x i32], [20 x i32]* %3, i64 0, i64 8
%43 = load i32, i32* %42
%44 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %43)
%45 = getelementptr inbounds [20 x i32], [20 x i32]* %3, i64 0, i64 9
%46 = load i32, i32* %45
%47 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %46)
%48 = getelementptr inbounds [20 x i32], [20 x i32]* %3, i64 0, i64 10
%49 = load i32, i32* %48
%50 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %49)
%51 = getelementptr inbounds [20 x i32], [20 x i32]* %3, i64 0, i64 11
%52 = load i32, i32* %51
%53 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %52)
%54 = getelementptr inbounds [20 x i32], [20 x i32]* %3, i64 0, i64 12
%55 = load i32, i32* %54
%56 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %55)
%57 = getelementptr inbounds [20 x i32], [20 x i32]* %3, i64 0, i64 13
%58 = load i32, i32* %57
%59 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %58)
%60 = getelementptr inbounds [20 x i32], [20 x i32]* %3, i64 0, i64 14
%61 = load i32, i32* %60
%62 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %61)
%63 = getelementptr inbounds [20 x i32], [20 x i32]* %3, i64 0, i64 15
%64 = load i32, i32* %63
%65 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %64)
%66 = getelementptr inbounds [20 x i32], [20 x i32]* %3, i64 0, i64 16
%67 = load i32, i32* %66
%68 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %67)
%69 = getelementptr inbounds [20 x i32], [20 x i32]* %3, i64 0, i64 17
%70 = load i32, i32* %69
%71 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %70)
%72 = getelementptr inbounds [20 x i32], [20 x i32]* %3, i64 0, i64 18
%73 = load i32, i32* %72
%74 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %73)
%75 = getelementptr inbounds [20 x i32], [20 x i32]* %3, i64 0, i64 19
%76 = load i32, i32* %75
%77 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %76)
%78 = call i32 @putchar(i32 10)
ret i32 0
}