void is_stage2_twist_init(twist_arr) int twist_arr[18];
{
  twist_arr[0] = twist_arr[2] = twist_arr[3] = twist_arr[5] = twist_arr[9] =
      twist_arr[11] = twist_arr[12] = twist_arr[14] = 0;
  twist_arr[1] = twist_arr[4] = twist_arr[6] = twist_arr[7] = twist_arr[7] =
      twist_arr[10] = twist_arr[13] = twist_arr[15] = twist_arr[16] =
          twist_arr[17] = 1;
  return;
}


x86 assembly (clang, -O0):
<is_stage2_twist_init>:
push   %rbp
mov    %rsp,%rbp
mov    %rdi,-0x8(%rbp)
mov    -0x8(%rbp),%rax
movl   $0x0,0x38(%rax)
mov    -0x8(%rbp),%rax
movl   $0x0,0x30(%rax)
mov    -0x8(%rbp),%rax
movl   $0x0,0x2c(%rax)
mov    -0x8(%rbp),%rax
movl   $0x0,0x24(%rax)
mov    -0x8(%rbp),%rax
movl   $0x0,0x14(%rax)
mov    -0x8(%rbp),%rax
movl   $0x0,0xc(%rax)
mov    -0x8(%rbp),%rax
movl   $0x0,0x8(%rax)
mov    -0x8(%rbp),%rax
movl   $0x0,(%rax)
mov    -0x8(%rbp),%rax
movl   $0x1,0x44(%rax)
mov    -0x8(%rbp),%rax
movl   $0x1,0x40(%rax)
mov    -0x8(%rbp),%rax
movl   $0x1,0x3c(%rax)
mov    -0x8(%rbp),%rax
movl   $0x1,0x34(%rax)
mov    -0x8(%rbp),%rax
movl   $0x1,0x28(%rax)
mov    -0x8(%rbp),%rax
movl   $0x1,0x1c(%rax)
mov    -0x8(%rbp),%rax
movl   $0x1,0x1c(%rax)
mov    -0x8(%rbp),%rax
movl   $0x1,0x18(%rax)
mov    -0x8(%rbp),%rax
movl   $0x1,0x10(%rax)
mov    -0x8(%rbp),%rax
movl   $0x1,0x4(%rax)
pop    %rbp
ret

x86 assembly (clang, -O2):
<is_stage2_twist_init>:
movl   $0x1,0x44(%rdi)
movaps 0xef2(%rip),%xmm0
movups %xmm0,0x34(%rdi)
movaps 0xef7(%rip),%xmm1
movups %xmm1,0x24(%rdi)
movups %xmm0,0x10(%rdi)
movups %xmm1,(%rdi)
ret

LLVM IR (-O0):
define void @is_stage2_twist_init(i32* %0) {
%2 = alloca i32*
store i32* %0, i32** %2
%3 = load i32*, i32** %2
%4 = getelementptr inbounds i32, i32* %3, i64 14
store i32 0, i32* %4
%5 = load i32*, i32** %2
%6 = getelementptr inbounds i32, i32* %5, i64 12
store i32 0, i32* %6
%7 = load i32*, i32** %2
%8 = getelementptr inbounds i32, i32* %7, i64 11
store i32 0, i32* %8
%9 = load i32*, i32** %2
%10 = getelementptr inbounds i32, i32* %9, i64 9
store i32 0, i32* %10
%11 = load i32*, i32** %2
%12 = getelementptr inbounds i32, i32* %11, i64 5
store i32 0, i32* %12
%13 = load i32*, i32** %2
%14 = getelementptr inbounds i32, i32* %13, i64 3
store i32 0, i32* %14
%15 = load i32*, i32** %2
%16 = getelementptr inbounds i32, i32* %15, i64 2
store i32 0, i32* %16
%17 = load i32*, i32** %2
%18 = getelementptr inbounds i32, i32* %17, i64 0
store i32 0, i32* %18
%19 = load i32*, i32** %2
%20 = getelementptr inbounds i32, i32* %19, i64 17
store i32 1, i32* %20
%21 = load i32*, i32** %2
%22 = getelementptr inbounds i32, i32* %21, i64 16
store i32 1, i32* %22
%23 = load i32*, i32** %2
%24 = getelementptr inbounds i32, i32* %23, i64 15
store i32 1, i32* %24
%25 = load i32*, i32** %2
%26 = getelementptr inbounds i32, i32* %25, i64 13
store i32 1, i32* %26
%27 = load i32*, i32** %2
%28 = getelementptr inbounds i32, i32* %27, i64 10
store i32 1, i32* %28
%29 = load i32*, i32** %2
%30 = getelementptr inbounds i32, i32* %29, i64 7
store i32 1, i32* %30
%31 = load i32*, i32** %2
%32 = getelementptr inbounds i32, i32* %31, i64 7
store i32 1, i32* %32
%33 = load i32*, i32** %2
%34 = getelementptr inbounds i32, i32* %33, i64 6
store i32 1, i32* %34
%35 = load i32*, i32** %2
%36 = getelementptr inbounds i32, i32* %35, i64 4
store i32 1, i32* %36
%37 = load i32*, i32** %2
%38 = getelementptr inbounds i32, i32* %37, i64 1
store i32 1, i32* %38
ret void
}

LLVM IR (-O2):
define void @is_stage2_twist_init(i32* nocapture writeonly %0) {
%2 = getelementptr inbounds i32, i32* %0, i64 9
%3 = getelementptr inbounds i32, i32* %0, i64 17
store i32 1, i32* %3
%4 = getelementptr inbounds i32, i32* %0, i64 13
%5 = bitcast i32* %4 to <4 x i32>*
store <4 x i32> <i32 1, i32 0, i32 1, i32 1>, <4 x i32>* %5
%6 = bitcast i32* %2 to <4 x i32>*
store <4 x i32> <i32 0, i32 1, i32 0, i32 0>, <4 x i32>* %6
%7 = getelementptr inbounds i32, i32* %0, i64 4
%8 = bitcast i32* %7 to <4 x i32>*
store <4 x i32> <i32 1, i32 0, i32 1, i32 1>, <4 x i32>* %8
%9 = bitcast i32* %0 to <4 x i32>*
store <4 x i32> <i32 0, i32 1, i32 0, i32 0>, <4 x i32>* %9
ret void
}