/*
 * Copyright 2011-2013 Intel Corporation
 * Modifications Copyright 2014, Blender Foundation.
 *
 * Licensed under the Apache License, Version 2.0(the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License
 */

#ifndef __UTIL_SSEB_H__
#define __UTIL_SSEB_H__

CCL_NAMESPACE_BEGIN

#ifdef __KERNEL_SSE2__

/*! 4-wide SSE bool type. */
struct sseb
{
	typedef sseb Mask;                    // mask type
	typedef ssei Int;                     // int type
	typedef ssef Float;                   // float type

	enum   { size = 4 };                  // number of SIMD elements
	union  { __m128 m128; int32_t v[4]; };  // data

	////////////////////////////////////////////////////////////////////////////////
	/// Constructors, Assignment & Cast Operators
	////////////////////////////////////////////////////////////////////////////////
	
	__forceinline sseb           ( ) {}
	__forceinline sseb           ( const sseb& other ) { m128 = other.m128; }
	__forceinline sseb& operator=( const sseb& other ) { m128 = other.m128; return *this; }

	__forceinline sseb( const __m128  input ) : m128(input) {}
	__forceinline operator const __m128&( void ) const { return m128; }
	__forceinline operator const __m128i( void ) const { return _mm_castps_si128(m128); }
	__forceinline operator const __m128d( void ) const { return _mm_castps_pd(m128); }
	
	__forceinline sseb           ( bool  a )
		: m128(_mm_lookupmask_ps[(size_t(a) << 3) | (size_t(a) << 2) | (size_t(a) << 1) | size_t(a)]) {}
	__forceinline sseb           ( bool  a, bool  b) 
		: m128(_mm_lookupmask_ps[(size_t(b) << 3) | (size_t(a) << 2) | (size_t(b) << 1) | size_t(a)]) {}
	__forceinline sseb           ( bool  a, bool  b, bool  c, bool  d)
		: m128(_mm_lookupmask_ps[(size_t(d) << 3) | (size_t(c) << 2) | (size_t(b) << 1) | size_t(a)]) {}
	__forceinline sseb(int mask) {
		assert(mask >= 0 && mask < 16);
		m128 = _mm_lookupmask_ps[mask];
	}

	////////////////////////////////////////////////////////////////////////////////
	/// Constants
	////////////////////////////////////////////////////////////////////////////////

	__forceinline sseb( FalseTy ) : m128(_mm_setzero_ps()) {}
	__forceinline sseb( TrueTy  ) : m128(_mm_castsi128_ps(_mm_cmpeq_epi32(_mm_setzero_si128(), _mm_setzero_si128()))) {}

	////////////////////////////////////////////////////////////////////////////////
	/// Array Access
	////////////////////////////////////////////////////////////////////////////////

	__forceinline bool   operator []( const size_t i ) const { assert(i < 4); return (_mm_movemask_ps(m128) >> i) & 1; }
	__forceinline int32_t& operator []( const size_t i )       { assert(i < 4); return v[i]; }
};

////////////////////////////////////////////////////////////////////////////////
/// Unary Operators
////////////////////////////////////////////////////////////////////////////////

__forceinline const sseb operator !( const sseb& a ) { return _mm_xor_ps(a, sseb(True)); }

////////////////////////////////////////////////////////////////////////////////
/// Binary Operators
////////////////////////////////////////////////////////////////////////////////

__forceinline const sseb operator &( const sseb& a, const sseb& b ) { return _mm_and_ps(a, b); }
__forceinline const sseb operator |( const sseb& a, const sseb& b ) { return _mm_or_ps (a, b); }
__forceinline const sseb operator ^( const sseb& a, const sseb& b ) { return _mm_xor_ps(a, b); }

////////////////////////////////////////////////////////////////////////////////
/// Assignment Operators
////////////////////////////////////////////////////////////////////////////////

__forceinline const sseb operator &=( sseb& a, const sseb& b ) { return a = a & b; }
__forceinline const sseb operator |=( sseb& a, const sseb& b ) { return a = a | b; }
__forceinline const sseb operator ^=( sseb& a, const sseb& b ) { return a = a ^ b; }

////////////////////////////////////////////////////////////////////////////////
/// Comparison Operators + Select
////////////////////////////////////////////////////////////////////////////////

__forceinline const sseb operator !=( const sseb& a, const sseb& b ) { return _mm_xor_ps(a, b); }
__forceinline const sseb operator ==( const sseb& a, const sseb& b ) { return _mm_castsi128_ps(_mm_cmpeq_epi32(a, b)); }

__forceinline const sseb select( const sseb& m, const sseb& t, const sseb& f ) { 
#if defined(__KERNEL_SSE41__)
	return _mm_blendv_ps(f, t, m); 
#else
	return _mm_or_ps(_mm_and_ps(m, t), _mm_andnot_ps(m, f)); 
#endif
}

////////////////////////////////////////////////////////////////////////////////
/// Movement/Shifting/Shuffling Functions
////////////////////////////////////////////////////////////////////////////////

__forceinline const sseb unpacklo( const sseb& a, const sseb& b ) { return _mm_unpacklo_ps(a, b); }
__forceinline const sseb unpackhi( const sseb& a, const sseb& b ) { return _mm_unpackhi_ps(a, b); }

template<size_t i0, size_t i1, size_t i2, size_t i3> __forceinline const sseb shuffle( const sseb& a ) {
	return _mm_shuffle_epi32(a, _MM_SHUFFLE(i3, i2, i1, i0));
}

template<size_t i0, size_t i1, size_t i2, size_t i3> __forceinline const sseb shuffle( const sseb& a, const sseb& b ) {
	return _mm_shuffle_ps(a, b, _MM_SHUFFLE(i3, i2, i1, i0));
}

#if defined(__KERNEL_SSE3__)
template<> __forceinline const sseb shuffle<0, 0, 2, 2>( const sseb& a ) { return _mm_moveldup_ps(a); }
template<> __forceinline const sseb shuffle<1, 1, 3, 3>( const sseb& a ) { return _mm_movehdup_ps(a); }
template<> __forceinline const sseb shuffle<0, 1, 0, 1>( const sseb& a ) { return _mm_castpd_ps(_mm_movedup_pd (a)); }
#endif

#if defined(__KERNEL_SSE41__)
template<size_t dst, size_t src, size_t clr> __forceinline const sseb insert( const sseb& a, const sseb& b ) { return _mm_insert_ps(a, b, (dst << 4) | (src << 6) | clr); }
template<size_t dst, size_t src> __forceinline const sseb insert( const sseb& a, const sseb& b ) { return insert<dst, src, 0>(a, b); }
template<size_t dst>             __forceinline const sseb insert( const sseb& a, const bool b ) { return insert<dst,0>(a, sseb(b)); }
#endif

////////////////////////////////////////////////////////////////////////////////
/// Reduction Operations
////////////////////////////////////////////////////////////////////////////////

#if defined(__KERNEL_SSE41__)
__forceinline size_t popcnt( const sseb& a ) { return __popcnt(_mm_movemask_ps(a)); }
#else
__forceinline size_t popcnt( const sseb& a ) { return bool(a[0])+bool(a[1])+bool(a[2])+bool(a[3]); }
#endif

__forceinline bool reduce_and( const sseb& a ) { return _mm_movemask_ps(a) == 0xf; }
__forceinline bool reduce_or ( const sseb& a ) { return _mm_movemask_ps(a) != 0x0; }
__forceinline bool all       ( const sseb& b ) { return _mm_movemask_ps(b) == 0xf; }
__forceinline bool any       ( const sseb& b ) { return _mm_movemask_ps(b) != 0x0; }
__forceinline bool none      ( const sseb& b ) { return _mm_movemask_ps(b) == 0x0; }

__forceinline size_t movemask( const sseb& a ) { return _mm_movemask_ps(a); }

#endif

CCL_NAMESPACE_END

#endif

