int main() {
  int x[10];
  memcpy(x, (int[]){7, 8, 6, 5, 3, 4, 2, 1, 9, 0}, sizeof x);
  quick_sort(x, 0, 9);
  for (int i = 0; i < 10; i++)
    printf("%d", x[i]);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x70,%rsp
movl   $0x0,-0x4(%rbp)
lea    -0x30(%rbp),%rax
mov    %rax,-0x68(%rbp)
lea    -0x58(%rbp),%rdi
lea    0x2ee6(%rip),%rsi
mov    $0x28,%edx
call   1040 <memcpy@plt>
mov    -0x68(%rbp),%rdi
lea    -0x58(%rbp),%rsi
mov    $0x28,%edx
call   1040 <memcpy@plt>
lea    -0x30(%rbp),%rdi
xor    %esi,%esi
mov    $0x9,%edx
mov    $0x0,%al
call   1050 <quick_sort@plt>
movl   $0x0,-0x5c(%rbp)
cmpl   $0xa,-0x5c(%rbp)
jge    11b5 <main+0x85>
movslq -0x5c(%rbp),%rax
mov    -0x30(%rbp,%rax,4),%esi
lea    0xe60(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x5c(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x5c(%rbp)
jmp    1187 <main+0x57>
xor    %eax,%eax
add    $0x70,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
sub    $0x30,%rsp
mov    0xef4(%rip),%rax
mov    %rax,0x20(%rsp)
movups 0xed8(%rip),%xmm0
movaps %xmm0,0x10(%rsp)
movups 0xebc(%rip),%xmm0
movaps %xmm0,(%rsp)
mov    %rsp,%rdi
xor    %esi,%esi
mov    $0x9,%edx
xor    %eax,%eax
call   1040 <quick_sort@plt>
mov    (%rsp),%esi
lea    0xec5(%rip),%rbx
mov    %rbx,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
mov    0x4(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
mov    0x8(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
mov    0xc(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
mov    0x10(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
mov    0x14(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
mov    0x18(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
mov    0x1c(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
mov    0x20(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
mov    0x24(%rsp),%esi
mov    %rbx,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x30,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@constinit = private global [10 x i32] [i32 7, i32 8, i32 6, i32 5, i32 3, i32 4, i32 2, i32 1, i32 9, i32 0]
@.str = [3 x i8] c"%d\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca [10 x i32]
%3 = alloca [10 x i32]
%4 = alloca i32
store i32 0, i32* %1
%5 = getelementptr inbounds [10 x i32], [10 x i32]* %2, i64 0, i64 0
%6 = bitcast i32* %5 to i8*
%7 = getelementptr inbounds [10 x i32], [10 x i32]* %3, i64 0, i64 0
%8 = bitcast [10 x i32]* %3 to i8*
%9 = getelementptr inbounds [10 x i32], [10 x i32]* %3, i64 0, i64 0
%10 = bitcast i32* %9 to i8*
%11 = getelementptr inbounds [10 x i32], [10 x i32]* %2, i64 0, i64 0
%12 = call i32 (i32*, i32, i32, ...) bitcast (i32 (...)* @quick_sort to i32 (i32*, i32, i32, ...)*)(i32* %11, i32 0, i32 9)
store i32 0, i32* %4
br label %13
13: ; preds = %22, %0
%14 = load i32, i32* %4
%15 = icmp slt i32 %14, 10
br i1 %15, label %16, label %25
16: ; preds = %13
%17 = load i32, i32* %4
%18 = sext i32 %17 to i64
%19 = getelementptr inbounds [10 x i32], [10 x i32]* %2, i64 0, i64 %18
%20 = load i32, i32* %19
%21 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32 %20)
br label %22
22: ; preds = %16
%23 = load i32, i32* %4
%24 = add nsw i32 %23, 1
store i32 %24, i32* %4
br label %13
25: ; preds = %13
ret i32 0
}

LLVM IR (-O2):
@constinit = [10 x i32] [i32 7, i32 8, i32 6, i32 5, i32 3, i32 4, i32 2, i32 1, i32 9, i32 0]
@.str = [3 x i8] c"%d\00"
define i32 @main() {
%1 = alloca [10 x i32]
%2 = bitcast [10 x i32]* %1 to i8*
%3 = getelementptr inbounds [10 x i32], [10 x i32]* %1, i64 0, i64 0
%4 = call i32 (i32*, i32, i32, ...) bitcast (i32 (...)* @quick_sort to i32 (i32*, i32, i32, ...)*)(i32* %3, i32 0, i32 9)
%5 = load i32, i32* %3
%6 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32 %5)
%7 = getelementptr inbounds [10 x i32], [10 x i32]* %1, i64 0, i64 1
%8 = load i32, i32* %7
%9 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32 %8)
%10 = getelementptr inbounds [10 x i32], [10 x i32]* %1, i64 0, i64 2
%11 = load i32, i32* %10
%12 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32 %11)
%13 = getelementptr inbounds [10 x i32], [10 x i32]* %1, i64 0, i64 3
%14 = load i32, i32* %13
%15 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32 %14)
%16 = getelementptr inbounds [10 x i32], [10 x i32]* %1, i64 0, i64 4
%17 = load i32, i32* %16
%18 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32 %17)
%19 = getelementptr inbounds [10 x i32], [10 x i32]* %1, i64 0, i64 5
%20 = load i32, i32* %19
%21 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32 %20)
%22 = getelementptr inbounds [10 x i32], [10 x i32]* %1, i64 0, i64 6
%23 = load i32, i32* %22
%24 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32 %23)
%25 = getelementptr inbounds [10 x i32], [10 x i32]* %1, i64 0, i64 7
%26 = load i32, i32* %25
%27 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32 %26)
%28 = getelementptr inbounds [10 x i32], [10 x i32]* %1, i64 0, i64 8
%29 = load i32, i32* %28
%30 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32 %29)
%31 = getelementptr inbounds [10 x i32], [10 x i32]* %1, i64 0, i64 9
%32 = load i32, i32* %31
%33 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i64 0, i64 0), i32 %32)
ret i32 0
}