#pragma once

#include <x86intrin.h>

namespace sse42
{
constexpr int strcmp_mode = _SIDD_CMP_EQUAL_EACH
                          | _SIDD_NEGATIVE_POLARITY;

constexpr unsigned CF = 0x1;
constexpr unsigned ZF = 0x40;

bool streq(const char* lhs, const char* rhs)
{
    int idx, eflags;

    while(true)
    {
        auto lhs_mm = _mm_loadu_si128((__m128i*)lhs);
        auto rhs_mm = _mm_loadu_si128((__m128i*)rhs);

        idx = _mm_cmpistri(lhs_mm, rhs_mm, strcmp_mode);
        eflags = __readeflags();

        if(idx != 0x10)
            return false;

        if((eflags & (ZF | CF)) != 0)
            return true;

        lhs += 16;
        rhs += 16;
    }
}

}