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1284 lines
31 KiB
C++
1284 lines
31 KiB
C++
// SPDX-License-Identifier: Apache-2.0
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// ----------------------------------------------------------------------------
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// Copyright 2019-2022 Arm Limited
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy
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// of the License at:
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations
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// under the License.
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// ----------------------------------------------------------------------------
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/**
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* @brief 4x32-bit vectors, implemented using SSE.
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*
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* This module implements 4-wide 32-bit float, int, and mask vectors for x86
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* SSE. The implementation requires at least SSE2, but higher levels of SSE can
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* be selected at compile time to improve performance.
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*
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* There is a baseline level of functionality provided by all vector widths and
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* implementations. This is implemented using identical function signatures,
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* modulo data type, so we can use them as substitutable implementations in VLA
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* code.
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*
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* The 4-wide vectors are also used as a fixed-width type, and significantly
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* extend the functionality above that available to VLA code.
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*/
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#ifndef ASTC_VECMATHLIB_SSE_4_H_INCLUDED
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#define ASTC_VECMATHLIB_SSE_4_H_INCLUDED
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#ifndef ASTCENC_SIMD_INLINE
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#error "Include astcenc_vecmathlib.h, do not include directly"
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#endif
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#include <cstdio>
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// ============================================================================
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// vfloat4 data type
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// ============================================================================
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/**
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* @brief Data type for 4-wide floats.
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*/
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struct vfloat4
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{
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/**
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* @brief Construct from zero-initialized value.
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*/
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ASTCENC_SIMD_INLINE vfloat4() = default;
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/**
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* @brief Construct from 4 values loaded from an unaligned address.
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*
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* Consider using loada() which is better with vectors if data is aligned
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* to vector length.
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*/
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ASTCENC_SIMD_INLINE explicit vfloat4(const float *p)
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{
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m = _mm_loadu_ps(p);
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}
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/**
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* @brief Construct from 1 scalar value replicated across all lanes.
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*
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* Consider using zero() for constexpr zeros.
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*/
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ASTCENC_SIMD_INLINE explicit vfloat4(float a)
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{
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m = _mm_set1_ps(a);
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}
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/**
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* @brief Construct from 4 scalar values.
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*
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* The value of @c a is stored to lane 0 (LSB) in the SIMD register.
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*/
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ASTCENC_SIMD_INLINE explicit vfloat4(float a, float b, float c, float d)
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{
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m = _mm_set_ps(d, c, b, a);
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}
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/**
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* @brief Construct from an existing SIMD register.
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*/
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ASTCENC_SIMD_INLINE explicit vfloat4(__m128 a)
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{
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m = a;
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}
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/**
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* @brief Get the scalar value of a single lane.
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*/
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template <int l> ASTCENC_SIMD_INLINE float lane() const
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{
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return _mm_cvtss_f32(_mm_shuffle_ps(m, m, l));
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}
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/**
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* @brief Set the scalar value of a single lane.
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*/
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template <int l> ASTCENC_SIMD_INLINE void set_lane(float a)
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{
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#if ASTCENC_SSE >= 41
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__m128 v = _mm_set1_ps(a);
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m = _mm_insert_ps(m, v, l << 6 | l << 4);
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#else
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alignas(16) float idx[4];
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_mm_store_ps(idx, m);
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idx[l] = a;
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m = _mm_load_ps(idx);
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#endif
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}
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/**
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* @brief Factory that returns a vector of zeros.
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*/
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static ASTCENC_SIMD_INLINE vfloat4 zero()
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{
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return vfloat4(_mm_setzero_ps());
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}
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/**
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* @brief Factory that returns a replicated scalar loaded from memory.
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*/
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static ASTCENC_SIMD_INLINE vfloat4 load1(const float* p)
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{
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return vfloat4(_mm_load_ps1(p));
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}
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/**
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* @brief Factory that returns a vector loaded from 16B aligned memory.
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*/
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static ASTCENC_SIMD_INLINE vfloat4 loada(const float* p)
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{
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return vfloat4(_mm_load_ps(p));
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}
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/**
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* @brief Factory that returns a vector containing the lane IDs.
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*/
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static ASTCENC_SIMD_INLINE vfloat4 lane_id()
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{
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return vfloat4(_mm_set_ps(3, 2, 1, 0));
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}
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/**
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* @brief Return a swizzled float 2.
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*/
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template <int l0, int l1> ASTCENC_SIMD_INLINE vfloat4 swz() const
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{
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vfloat4 result(_mm_shuffle_ps(m, m, l0 | l1 << 2));
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result.set_lane<2>(0.0f);
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result.set_lane<3>(0.0f);
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return result;
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}
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/**
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* @brief Return a swizzled float 3.
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*/
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template <int l0, int l1, int l2> ASTCENC_SIMD_INLINE vfloat4 swz() const
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{
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vfloat4 result(_mm_shuffle_ps(m, m, l0 | l1 << 2 | l2 << 4));
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result.set_lane<3>(0.0f);
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return result;
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}
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/**
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* @brief Return a swizzled float 4.
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*/
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template <int l0, int l1, int l2, int l3> ASTCENC_SIMD_INLINE vfloat4 swz() const
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{
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return vfloat4(_mm_shuffle_ps(m, m, l0 | l1 << 2 | l2 << 4 | l3 << 6));
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}
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/**
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* @brief The vector ...
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*/
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__m128 m;
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};
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// ============================================================================
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// vint4 data type
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// ============================================================================
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/**
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* @brief Data type for 4-wide ints.
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*/
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struct vint4
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{
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/**
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* @brief Construct from zero-initialized value.
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*/
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ASTCENC_SIMD_INLINE vint4() = default;
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/**
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* @brief Construct from 4 values loaded from an unaligned address.
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*
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* Consider using loada() which is better with vectors if data is aligned
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* to vector length.
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*/
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ASTCENC_SIMD_INLINE explicit vint4(const int *p)
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{
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m = _mm_loadu_si128(reinterpret_cast<const __m128i*>(p));
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}
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/**
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* @brief Construct from 4 uint8_t loaded from an unaligned address.
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*/
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ASTCENC_SIMD_INLINE explicit vint4(const uint8_t *p)
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{
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// _mm_loadu_si32 would be nicer syntax, but missing on older GCC
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__m128i t = _mm_cvtsi32_si128(*reinterpret_cast<const int*>(p));
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#if ASTCENC_SSE >= 41
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m = _mm_cvtepu8_epi32(t);
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#else
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t = _mm_unpacklo_epi8(t, _mm_setzero_si128());
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m = _mm_unpacklo_epi16(t, _mm_setzero_si128());
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#endif
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}
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/**
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* @brief Construct from 1 scalar value replicated across all lanes.
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*
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* Consider using vfloat4::zero() for constexpr zeros.
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*/
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ASTCENC_SIMD_INLINE explicit vint4(int a)
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{
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m = _mm_set1_epi32(a);
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}
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/**
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* @brief Construct from 4 scalar values.
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*
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* The value of @c a is stored to lane 0 (LSB) in the SIMD register.
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*/
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ASTCENC_SIMD_INLINE explicit vint4(int a, int b, int c, int d)
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{
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m = _mm_set_epi32(d, c, b, a);
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}
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/**
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* @brief Construct from an existing SIMD register.
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*/
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ASTCENC_SIMD_INLINE explicit vint4(__m128i a)
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{
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m = a;
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}
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/**
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* @brief Get the scalar from a single lane.
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*/
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template <int l> ASTCENC_SIMD_INLINE int lane() const
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{
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return _mm_cvtsi128_si32(_mm_shuffle_epi32(m, l));
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}
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/**
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* @brief Set the scalar value of a single lane.
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*/
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template <int l> ASTCENC_SIMD_INLINE void set_lane(int a)
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{
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#if ASTCENC_SSE >= 41
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m = _mm_insert_epi32(m, a, l);
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#else
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alignas(16) int idx[4];
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_mm_store_si128(reinterpret_cast<__m128i*>(idx), m);
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idx[l] = a;
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m = _mm_load_si128(reinterpret_cast<const __m128i*>(idx));
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#endif
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}
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/**
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* @brief Factory that returns a vector of zeros.
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*/
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static ASTCENC_SIMD_INLINE vint4 zero()
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{
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return vint4(_mm_setzero_si128());
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}
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/**
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* @brief Factory that returns a replicated scalar loaded from memory.
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*/
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static ASTCENC_SIMD_INLINE vint4 load1(const int* p)
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{
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return vint4(*p);
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}
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/**
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* @brief Factory that returns a vector loaded from 16B aligned memory.
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*/
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static ASTCENC_SIMD_INLINE vint4 loada(const int* p)
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{
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return vint4(_mm_load_si128(reinterpret_cast<const __m128i*>(p)));
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}
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/**
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* @brief Factory that returns a vector containing the lane IDs.
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*/
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static ASTCENC_SIMD_INLINE vint4 lane_id()
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{
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return vint4(_mm_set_epi32(3, 2, 1, 0));
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}
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/**
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* @brief The vector ...
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*/
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__m128i m;
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};
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// ============================================================================
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// vmask4 data type
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// ============================================================================
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/**
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* @brief Data type for 4-wide control plane masks.
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*/
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struct vmask4
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{
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/**
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* @brief Construct from an existing SIMD register.
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*/
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ASTCENC_SIMD_INLINE explicit vmask4(__m128 a)
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{
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m = a;
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}
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/**
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* @brief Construct from an existing SIMD register.
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*/
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ASTCENC_SIMD_INLINE explicit vmask4(__m128i a)
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{
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m = _mm_castsi128_ps(a);
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}
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/**
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* @brief Construct from 1 scalar value.
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*/
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ASTCENC_SIMD_INLINE explicit vmask4(bool a)
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{
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vint4 mask(a == false ? 0 : -1);
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m = _mm_castsi128_ps(mask.m);
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}
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/**
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* @brief Construct from 4 scalar values.
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*
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* The value of @c a is stored to lane 0 (LSB) in the SIMD register.
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*/
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ASTCENC_SIMD_INLINE explicit vmask4(bool a, bool b, bool c, bool d)
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{
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vint4 mask(a == false ? 0 : -1,
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b == false ? 0 : -1,
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c == false ? 0 : -1,
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d == false ? 0 : -1);
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m = _mm_castsi128_ps(mask.m);
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}
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/**
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* @brief Get the scalar value of a single lane.
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*/
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template <int l> ASTCENC_SIMD_INLINE float lane() const
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{
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return _mm_cvtss_f32(_mm_shuffle_ps(m, m, l));
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}
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/**
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* @brief The vector ...
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*/
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__m128 m;
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};
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// ============================================================================
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// vmask4 operators and functions
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// ============================================================================
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/**
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* @brief Overload: mask union (or).
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*/
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ASTCENC_SIMD_INLINE vmask4 operator|(vmask4 a, vmask4 b)
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{
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return vmask4(_mm_or_ps(a.m, b.m));
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}
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/**
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* @brief Overload: mask intersect (and).
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*/
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ASTCENC_SIMD_INLINE vmask4 operator&(vmask4 a, vmask4 b)
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{
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return vmask4(_mm_and_ps(a.m, b.m));
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}
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/**
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* @brief Overload: mask difference (xor).
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*/
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ASTCENC_SIMD_INLINE vmask4 operator^(vmask4 a, vmask4 b)
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{
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return vmask4(_mm_xor_ps(a.m, b.m));
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}
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/**
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* @brief Overload: mask invert (not).
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*/
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ASTCENC_SIMD_INLINE vmask4 operator~(vmask4 a)
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{
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return vmask4(_mm_xor_si128(_mm_castps_si128(a.m), _mm_set1_epi32(-1)));
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}
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/**
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* @brief Return a 4-bit mask code indicating mask status.
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*
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* bit0 = lane 0
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*/
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ASTCENC_SIMD_INLINE unsigned int mask(vmask4 a)
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{
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return static_cast<unsigned int>(_mm_movemask_ps(a.m));
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}
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// ============================================================================
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// vint4 operators and functions
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// ============================================================================
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/**
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* @brief Overload: vector by vector addition.
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*/
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ASTCENC_SIMD_INLINE vint4 operator+(vint4 a, vint4 b)
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{
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return vint4(_mm_add_epi32(a.m, b.m));
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}
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/**
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* @brief Overload: vector by vector subtraction.
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*/
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ASTCENC_SIMD_INLINE vint4 operator-(vint4 a, vint4 b)
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{
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return vint4(_mm_sub_epi32(a.m, b.m));
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}
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/**
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* @brief Overload: vector by vector multiplication.
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*/
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ASTCENC_SIMD_INLINE vint4 operator*(vint4 a, vint4 b)
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{
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#if ASTCENC_SSE >= 41
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return vint4(_mm_mullo_epi32 (a.m, b.m));
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#else
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__m128i t1 = _mm_mul_epu32(a.m, b.m);
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__m128i t2 = _mm_mul_epu32(
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_mm_srli_si128(a.m, 4),
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_mm_srli_si128(b.m, 4));
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__m128i r = _mm_unpacklo_epi32(
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_mm_shuffle_epi32(t1, _MM_SHUFFLE (0, 0, 2, 0)),
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_mm_shuffle_epi32(t2, _MM_SHUFFLE (0, 0, 2, 0)));
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return vint4(r);
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#endif
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}
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/**
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* @brief Overload: vector bit invert.
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*/
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ASTCENC_SIMD_INLINE vint4 operator~(vint4 a)
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{
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return vint4(_mm_xor_si128(a.m, _mm_set1_epi32(-1)));
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}
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/**
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* @brief Overload: vector by vector bitwise or.
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*/
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ASTCENC_SIMD_INLINE vint4 operator|(vint4 a, vint4 b)
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{
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return vint4(_mm_or_si128(a.m, b.m));
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}
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/**
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* @brief Overload: vector by vector bitwise and.
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*/
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ASTCENC_SIMD_INLINE vint4 operator&(vint4 a, vint4 b)
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{
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return vint4(_mm_and_si128(a.m, b.m));
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}
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/**
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* @brief Overload: vector by vector bitwise xor.
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*/
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ASTCENC_SIMD_INLINE vint4 operator^(vint4 a, vint4 b)
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{
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return vint4(_mm_xor_si128(a.m, b.m));
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}
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/**
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* @brief Overload: vector by vector equality.
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*/
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ASTCENC_SIMD_INLINE vmask4 operator==(vint4 a, vint4 b)
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{
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return vmask4(_mm_cmpeq_epi32(a.m, b.m));
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}
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/**
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* @brief Overload: vector by vector inequality.
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*/
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ASTCENC_SIMD_INLINE vmask4 operator!=(vint4 a, vint4 b)
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{
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return ~vmask4(_mm_cmpeq_epi32(a.m, b.m));
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}
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/**
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* @brief Overload: vector by vector less than.
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*/
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ASTCENC_SIMD_INLINE vmask4 operator<(vint4 a, vint4 b)
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{
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return vmask4(_mm_cmplt_epi32(a.m, b.m));
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}
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/**
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* @brief Overload: vector by vector greater than.
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*/
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ASTCENC_SIMD_INLINE vmask4 operator>(vint4 a, vint4 b)
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{
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return vmask4(_mm_cmpgt_epi32(a.m, b.m));
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}
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/**
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* @brief Logical shift left.
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*/
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template <int s> ASTCENC_SIMD_INLINE vint4 lsl(vint4 a)
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{
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return vint4(_mm_slli_epi32(a.m, s));
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}
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/**
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* @brief Logical shift right.
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*/
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template <int s> ASTCENC_SIMD_INLINE vint4 lsr(vint4 a)
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{
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return vint4(_mm_srli_epi32(a.m, s));
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}
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/**
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* @brief Arithmetic shift right.
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*/
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template <int s> ASTCENC_SIMD_INLINE vint4 asr(vint4 a)
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|
{
|
|
return vint4(_mm_srai_epi32(a.m, s));
|
|
}
|
|
|
|
/**
|
|
* @brief Return the min vector of two vectors.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vint4 min(vint4 a, vint4 b)
|
|
{
|
|
#if ASTCENC_SSE >= 41
|
|
return vint4(_mm_min_epi32(a.m, b.m));
|
|
#else
|
|
vmask4 d = a < b;
|
|
__m128i ap = _mm_and_si128(_mm_castps_si128(d.m), a.m);
|
|
__m128i bp = _mm_andnot_si128(_mm_castps_si128(d.m), b.m);
|
|
return vint4(_mm_or_si128(ap,bp));
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* @brief Return the max vector of two vectors.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vint4 max(vint4 a, vint4 b)
|
|
{
|
|
#if ASTCENC_SSE >= 41
|
|
return vint4(_mm_max_epi32(a.m, b.m));
|
|
#else
|
|
vmask4 d = a > b;
|
|
__m128i ap = _mm_and_si128(_mm_castps_si128(d.m), a.m);
|
|
__m128i bp = _mm_andnot_si128(_mm_castps_si128(d.m), b.m);
|
|
return vint4(_mm_or_si128(ap,bp));
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* @brief Return the horizontal minimum of a vector.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vint4 hmin(vint4 a)
|
|
{
|
|
a = min(a, vint4(_mm_shuffle_epi32(a.m, _MM_SHUFFLE(0, 0, 3, 2))));
|
|
a = min(a, vint4(_mm_shuffle_epi32(a.m, _MM_SHUFFLE(0, 0, 0, 1))));
|
|
return vint4(_mm_shuffle_epi32(a.m, _MM_SHUFFLE(0, 0, 0, 0)));
|
|
}
|
|
|
|
/*
|
|
* @brief Return the horizontal maximum of a vector.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vint4 hmax(vint4 a)
|
|
{
|
|
a = max(a, vint4(_mm_shuffle_epi32(a.m, _MM_SHUFFLE(0, 0, 3, 2))));
|
|
a = max(a, vint4(_mm_shuffle_epi32(a.m, _MM_SHUFFLE(0, 0, 0, 1))));
|
|
return vint4(_mm_shuffle_epi32(a.m, _MM_SHUFFLE(0, 0, 0, 0)));
|
|
}
|
|
|
|
/**
|
|
* @brief Return the horizontal sum of a vector as a scalar.
|
|
*/
|
|
ASTCENC_SIMD_INLINE int hadd_s(vint4 a)
|
|
{
|
|
// Add top and bottom halves, lane 1/0
|
|
__m128i fold = _mm_castps_si128(_mm_movehl_ps(_mm_castsi128_ps(a.m),
|
|
_mm_castsi128_ps(a.m)));
|
|
__m128i t = _mm_add_epi32(a.m, fold);
|
|
|
|
// Add top and bottom halves, lane 0 (_mm_hadd_ps exists but slow)
|
|
t = _mm_add_epi32(t, _mm_shuffle_epi32(t, 0x55));
|
|
|
|
return _mm_cvtsi128_si32(t);
|
|
}
|
|
|
|
/**
|
|
* @brief Store a vector to a 16B aligned memory address.
|
|
*/
|
|
ASTCENC_SIMD_INLINE void storea(vint4 a, int* p)
|
|
{
|
|
_mm_store_si128(reinterpret_cast<__m128i*>(p), a.m);
|
|
}
|
|
|
|
/**
|
|
* @brief Store a vector to an unaligned memory address.
|
|
*/
|
|
ASTCENC_SIMD_INLINE void store(vint4 a, int* p)
|
|
{
|
|
// Cast due to missing intrinsics
|
|
_mm_storeu_ps(reinterpret_cast<float*>(p), _mm_castsi128_ps(a.m));
|
|
}
|
|
|
|
/**
|
|
* @brief Store lowest N (vector width) bytes into an unaligned address.
|
|
*/
|
|
ASTCENC_SIMD_INLINE void store_nbytes(vint4 a, uint8_t* p)
|
|
{
|
|
// Cast due to missing intrinsics
|
|
_mm_store_ss(reinterpret_cast<float*>(p), _mm_castsi128_ps(a.m));
|
|
}
|
|
|
|
/**
|
|
* @brief Gather N (vector width) indices from the array.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vint4 gatheri(const int* base, vint4 indices)
|
|
{
|
|
#if ASTCENC_AVX >= 2
|
|
return vint4(_mm_i32gather_epi32(base, indices.m, 4));
|
|
#else
|
|
alignas(16) int idx[4];
|
|
storea(indices, idx);
|
|
return vint4(base[idx[0]], base[idx[1]], base[idx[2]], base[idx[3]]);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* @brief Pack low 8 bits of N (vector width) lanes into bottom of vector.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vint4 pack_low_bytes(vint4 a)
|
|
{
|
|
#if ASTCENC_SSE >= 41
|
|
__m128i shuf = _mm_set_epi8(0,0,0,0, 0,0,0,0, 0,0,0,0, 12,8,4,0);
|
|
return vint4(_mm_shuffle_epi8(a.m, shuf));
|
|
#else
|
|
__m128i va = _mm_unpacklo_epi8(a.m, _mm_shuffle_epi32(a.m, _MM_SHUFFLE(1,1,1,1)));
|
|
__m128i vb = _mm_unpackhi_epi8(a.m, _mm_shuffle_epi32(a.m, _MM_SHUFFLE(3,3,3,3)));
|
|
return vint4(_mm_unpacklo_epi16(va, vb));
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* @brief Return lanes from @c b if @c cond is set, else @c a.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vint4 select(vint4 a, vint4 b, vmask4 cond)
|
|
{
|
|
__m128i condi = _mm_castps_si128(cond.m);
|
|
|
|
#if ASTCENC_SSE >= 41
|
|
return vint4(_mm_blendv_epi8(a.m, b.m, condi));
|
|
#else
|
|
return vint4(_mm_or_si128(_mm_and_si128(condi, b.m), _mm_andnot_si128(condi, a.m)));
|
|
#endif
|
|
}
|
|
|
|
// ============================================================================
|
|
// vfloat4 operators and functions
|
|
// ============================================================================
|
|
|
|
/**
|
|
* @brief Overload: vector by vector addition.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vfloat4 operator+(vfloat4 a, vfloat4 b)
|
|
{
|
|
return vfloat4(_mm_add_ps(a.m, b.m));
|
|
}
|
|
|
|
/**
|
|
* @brief Overload: vector by vector subtraction.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vfloat4 operator-(vfloat4 a, vfloat4 b)
|
|
{
|
|
return vfloat4(_mm_sub_ps(a.m, b.m));
|
|
}
|
|
|
|
/**
|
|
* @brief Overload: vector by vector multiplication.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vfloat4 operator*(vfloat4 a, vfloat4 b)
|
|
{
|
|
return vfloat4(_mm_mul_ps(a.m, b.m));
|
|
}
|
|
|
|
/**
|
|
* @brief Overload: vector by vector division.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vfloat4 operator/(vfloat4 a, vfloat4 b)
|
|
{
|
|
return vfloat4(_mm_div_ps(a.m, b.m));
|
|
}
|
|
|
|
/**
|
|
* @brief Overload: vector by vector equality.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vmask4 operator==(vfloat4 a, vfloat4 b)
|
|
{
|
|
return vmask4(_mm_cmpeq_ps(a.m, b.m));
|
|
}
|
|
|
|
/**
|
|
* @brief Overload: vector by vector inequality.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vmask4 operator!=(vfloat4 a, vfloat4 b)
|
|
{
|
|
return vmask4(_mm_cmpneq_ps(a.m, b.m));
|
|
}
|
|
|
|
/**
|
|
* @brief Overload: vector by vector less than.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vmask4 operator<(vfloat4 a, vfloat4 b)
|
|
{
|
|
return vmask4(_mm_cmplt_ps(a.m, b.m));
|
|
}
|
|
|
|
/**
|
|
* @brief Overload: vector by vector greater than.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vmask4 operator>(vfloat4 a, vfloat4 b)
|
|
{
|
|
return vmask4(_mm_cmpgt_ps(a.m, b.m));
|
|
}
|
|
|
|
/**
|
|
* @brief Overload: vector by vector less than or equal.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vmask4 operator<=(vfloat4 a, vfloat4 b)
|
|
{
|
|
return vmask4(_mm_cmple_ps(a.m, b.m));
|
|
}
|
|
|
|
/**
|
|
* @brief Overload: vector by vector greater than or equal.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vmask4 operator>=(vfloat4 a, vfloat4 b)
|
|
{
|
|
return vmask4(_mm_cmpge_ps(a.m, b.m));
|
|
}
|
|
|
|
/**
|
|
* @brief Return the min vector of two vectors.
|
|
*
|
|
* If either lane value is NaN, @c b will be returned for that lane.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vfloat4 min(vfloat4 a, vfloat4 b)
|
|
{
|
|
// Do not reorder - second operand will return if either is NaN
|
|
return vfloat4(_mm_min_ps(a.m, b.m));
|
|
}
|
|
|
|
/**
|
|
* @brief Return the max vector of two vectors.
|
|
*
|
|
* If either lane value is NaN, @c b will be returned for that lane.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vfloat4 max(vfloat4 a, vfloat4 b)
|
|
{
|
|
// Do not reorder - second operand will return if either is NaN
|
|
return vfloat4(_mm_max_ps(a.m, b.m));
|
|
}
|
|
|
|
/**
|
|
* @brief Return the absolute value of the float vector.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vfloat4 abs(vfloat4 a)
|
|
{
|
|
return vfloat4(_mm_max_ps(_mm_sub_ps(_mm_setzero_ps(), a.m), a.m));
|
|
}
|
|
|
|
/**
|
|
* @brief Return a float rounded to the nearest integer value.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vfloat4 round(vfloat4 a)
|
|
{
|
|
#if ASTCENC_SSE >= 41
|
|
constexpr int flags = _MM_FROUND_TO_NEAREST_INT | _MM_FROUND_NO_EXC;
|
|
return vfloat4(_mm_round_ps(a.m, flags));
|
|
#else
|
|
__m128 v = a.m;
|
|
__m128 neg_zero = _mm_castsi128_ps(_mm_set1_epi32(static_cast<int>(0x80000000)));
|
|
__m128 no_fraction = _mm_set1_ps(8388608.0f);
|
|
__m128 abs_mask = _mm_castsi128_ps(_mm_set1_epi32(0x7FFFFFFF));
|
|
__m128 sign = _mm_and_ps(v, neg_zero);
|
|
__m128 s_magic = _mm_or_ps(no_fraction, sign);
|
|
__m128 r1 = _mm_add_ps(v, s_magic);
|
|
r1 = _mm_sub_ps(r1, s_magic);
|
|
__m128 r2 = _mm_and_ps(v, abs_mask);
|
|
__m128 mask = _mm_cmple_ps(r2, no_fraction);
|
|
r2 = _mm_andnot_ps(mask, v);
|
|
r1 = _mm_and_ps(r1, mask);
|
|
return vfloat4(_mm_xor_ps(r1, r2));
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* @brief Return the horizontal minimum of a vector.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vfloat4 hmin(vfloat4 a)
|
|
{
|
|
a = min(a, vfloat4(_mm_shuffle_ps(a.m, a.m, _MM_SHUFFLE(0, 0, 3, 2))));
|
|
a = min(a, vfloat4(_mm_shuffle_ps(a.m, a.m, _MM_SHUFFLE(0, 0, 0, 1))));
|
|
return vfloat4(_mm_shuffle_ps(a.m, a.m, _MM_SHUFFLE(0, 0, 0, 0)));
|
|
}
|
|
|
|
/**
|
|
* @brief Return the horizontal maximum of a vector.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vfloat4 hmax(vfloat4 a)
|
|
{
|
|
a = max(a, vfloat4(_mm_shuffle_ps(a.m, a.m, _MM_SHUFFLE(0, 0, 3, 2))));
|
|
a = max(a, vfloat4(_mm_shuffle_ps(a.m, a.m, _MM_SHUFFLE(0, 0, 0, 1))));
|
|
return vfloat4(_mm_shuffle_ps(a.m, a.m, _MM_SHUFFLE(0, 0, 0, 0)));
|
|
}
|
|
|
|
/**
|
|
* @brief Return the horizontal sum of a vector as a scalar.
|
|
*/
|
|
ASTCENC_SIMD_INLINE float hadd_s(vfloat4 a)
|
|
{
|
|
// Add top and bottom halves, lane 1/0
|
|
__m128 t = _mm_add_ps(a.m, _mm_movehl_ps(a.m, a.m));
|
|
|
|
// Add top and bottom halves, lane 0 (_mm_hadd_ps exists but slow)
|
|
t = _mm_add_ss(t, _mm_shuffle_ps(t, t, 0x55));
|
|
|
|
return _mm_cvtss_f32(t);
|
|
}
|
|
|
|
/**
|
|
* @brief Return the sqrt of the lanes in the vector.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vfloat4 sqrt(vfloat4 a)
|
|
{
|
|
return vfloat4(_mm_sqrt_ps(a.m));
|
|
}
|
|
|
|
/**
|
|
* @brief Return lanes from @c b if @c cond is set, else @c a.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vfloat4 select(vfloat4 a, vfloat4 b, vmask4 cond)
|
|
{
|
|
#if ASTCENC_SSE >= 41
|
|
return vfloat4(_mm_blendv_ps(a.m, b.m, cond.m));
|
|
#else
|
|
return vfloat4(_mm_or_ps(_mm_and_ps(cond.m, b.m), _mm_andnot_ps(cond.m, a.m)));
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* @brief Return lanes from @c b if MSB of @c cond is set, else @c a.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vfloat4 select_msb(vfloat4 a, vfloat4 b, vmask4 cond)
|
|
{
|
|
#if ASTCENC_SSE >= 41
|
|
return vfloat4(_mm_blendv_ps(a.m, b.m, cond.m));
|
|
#else
|
|
__m128 d = _mm_castsi128_ps(_mm_srai_epi32(_mm_castps_si128(cond.m), 31));
|
|
return vfloat4(_mm_or_ps(_mm_and_ps(d, b.m), _mm_andnot_ps(d, a.m)));
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* @brief Load a vector of gathered results from an array;
|
|
*/
|
|
ASTCENC_SIMD_INLINE vfloat4 gatherf(const float* base, vint4 indices)
|
|
{
|
|
#if ASTCENC_AVX >= 2
|
|
return vfloat4(_mm_i32gather_ps(base, indices.m, 4));
|
|
#else
|
|
alignas(16) int idx[4];
|
|
storea(indices, idx);
|
|
return vfloat4(base[idx[0]], base[idx[1]], base[idx[2]], base[idx[3]]);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* @brief Store a vector to an unaligned memory address.
|
|
*/
|
|
ASTCENC_SIMD_INLINE void store(vfloat4 a, float* p)
|
|
{
|
|
_mm_storeu_ps(p, a.m);
|
|
}
|
|
|
|
/**
|
|
* @brief Store a vector to a 16B aligned memory address.
|
|
*/
|
|
ASTCENC_SIMD_INLINE void storea(vfloat4 a, float* p)
|
|
{
|
|
_mm_store_ps(p, a.m);
|
|
}
|
|
|
|
/**
|
|
* @brief Return a integer value for a float vector, using truncation.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vint4 float_to_int(vfloat4 a)
|
|
{
|
|
return vint4(_mm_cvttps_epi32(a.m));
|
|
}
|
|
|
|
/**
|
|
* @brief Return a integer value for a float vector, using round-to-nearest.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vint4 float_to_int_rtn(vfloat4 a)
|
|
{
|
|
a = round(a);
|
|
return vint4(_mm_cvttps_epi32(a.m));
|
|
}
|
|
|
|
/**
|
|
* @brief Return a float value for an integer vector.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vfloat4 int_to_float(vint4 a)
|
|
{
|
|
return vfloat4(_mm_cvtepi32_ps(a.m));
|
|
}
|
|
|
|
/**
|
|
* @brief Return a float16 value for a float vector, using round-to-nearest.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vint4 float_to_float16(vfloat4 a)
|
|
{
|
|
#if ASTCENC_F16C >= 1
|
|
__m128i packedf16 = _mm_cvtps_ph(a.m, 0);
|
|
__m128i f16 = _mm_cvtepu16_epi32(packedf16);
|
|
return vint4(f16);
|
|
#else
|
|
return vint4(
|
|
float_to_sf16(a.lane<0>()),
|
|
float_to_sf16(a.lane<1>()),
|
|
float_to_sf16(a.lane<2>()),
|
|
float_to_sf16(a.lane<3>()));
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* @brief Return a float16 value for a float scalar, using round-to-nearest.
|
|
*/
|
|
static inline uint16_t float_to_float16(float a)
|
|
{
|
|
#if ASTCENC_F16C >= 1
|
|
__m128i f16 = _mm_cvtps_ph(_mm_set1_ps(a), 0);
|
|
return static_cast<uint16_t>(_mm_cvtsi128_si32(f16));
|
|
#else
|
|
return float_to_sf16(a);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* @brief Return a float value for a float16 vector.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vfloat4 float16_to_float(vint4 a)
|
|
{
|
|
#if ASTCENC_F16C >= 1
|
|
__m128i packed = _mm_packs_epi32(a.m, a.m);
|
|
__m128 f32 = _mm_cvtph_ps(packed);
|
|
return vfloat4(f32);
|
|
#else
|
|
return vfloat4(
|
|
sf16_to_float(static_cast<uint16_t>(a.lane<0>())),
|
|
sf16_to_float(static_cast<uint16_t>(a.lane<1>())),
|
|
sf16_to_float(static_cast<uint16_t>(a.lane<2>())),
|
|
sf16_to_float(static_cast<uint16_t>(a.lane<3>())));
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* @brief Return a float value for a float16 scalar.
|
|
*/
|
|
ASTCENC_SIMD_INLINE float float16_to_float(uint16_t a)
|
|
{
|
|
#if ASTCENC_F16C >= 1
|
|
__m128i packed = _mm_set1_epi16(static_cast<short>(a));
|
|
__m128 f32 = _mm_cvtph_ps(packed);
|
|
return _mm_cvtss_f32(f32);
|
|
#else
|
|
return sf16_to_float(a);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* @brief Return a float value as an integer bit pattern (i.e. no conversion).
|
|
*
|
|
* It is a common trick to convert floats into integer bit patterns, perform
|
|
* some bit hackery based on knowledge they are IEEE 754 layout, and then
|
|
* convert them back again. This is the first half of that flip.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vint4 float_as_int(vfloat4 a)
|
|
{
|
|
return vint4(_mm_castps_si128(a.m));
|
|
}
|
|
|
|
/**
|
|
* @brief Return a integer value as a float bit pattern (i.e. no conversion).
|
|
*
|
|
* It is a common trick to convert floats into integer bit patterns, perform
|
|
* some bit hackery based on knowledge they are IEEE 754 layout, and then
|
|
* convert them back again. This is the second half of that flip.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vfloat4 int_as_float(vint4 v)
|
|
{
|
|
return vfloat4(_mm_castsi128_ps(v.m));
|
|
}
|
|
|
|
/**
|
|
* @brief Prepare a vtable lookup table for use with the native SIMD size.
|
|
*/
|
|
ASTCENC_SIMD_INLINE void vtable_prepare(vint4 t0, vint4& t0p)
|
|
{
|
|
t0p = t0;
|
|
}
|
|
|
|
/**
|
|
* @brief Prepare a vtable lookup table for use with the native SIMD size.
|
|
*/
|
|
ASTCENC_SIMD_INLINE void vtable_prepare(vint4 t0, vint4 t1, vint4& t0p, vint4& t1p)
|
|
{
|
|
#if ASTCENC_SSE >= 41
|
|
t0p = t0;
|
|
t1p = t0 ^ t1;
|
|
#else
|
|
t0p = t0;
|
|
t1p = t1;
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* @brief Prepare a vtable lookup table for use with the native SIMD size.
|
|
*/
|
|
ASTCENC_SIMD_INLINE void vtable_prepare(
|
|
vint4 t0, vint4 t1, vint4 t2, vint4 t3,
|
|
vint4& t0p, vint4& t1p, vint4& t2p, vint4& t3p)
|
|
{
|
|
#if ASTCENC_SSE >= 41
|
|
t0p = t0;
|
|
t1p = t0 ^ t1;
|
|
t2p = t1 ^ t2;
|
|
t3p = t2 ^ t3;
|
|
#else
|
|
t0p = t0;
|
|
t1p = t1;
|
|
t2p = t2;
|
|
t3p = t3;
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* @brief Perform an 8-bit 16-entry table lookup, with 32-bit indexes.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vint4 vtable_8bt_32bi(vint4 t0, vint4 idx)
|
|
{
|
|
#if ASTCENC_SSE >= 41
|
|
// Set index byte MSB to 1 for unused bytes so shuffle returns zero
|
|
__m128i idxx = _mm_or_si128(idx.m, _mm_set1_epi32(static_cast<int>(0xFFFFFF00)));
|
|
|
|
__m128i result = _mm_shuffle_epi8(t0.m, idxx);
|
|
return vint4(result);
|
|
#else
|
|
alignas(ASTCENC_VECALIGN) uint8_t table[16];
|
|
storea(t0, reinterpret_cast<int*>(table + 0));
|
|
|
|
return vint4(table[idx.lane<0>()],
|
|
table[idx.lane<1>()],
|
|
table[idx.lane<2>()],
|
|
table[idx.lane<3>()]);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* @brief Perform an 8-bit 32-entry table lookup, with 32-bit indexes.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vint4 vtable_8bt_32bi(vint4 t0, vint4 t1, vint4 idx)
|
|
{
|
|
#if ASTCENC_SSE >= 41
|
|
// Set index byte MSB to 1 for unused bytes so shuffle returns zero
|
|
__m128i idxx = _mm_or_si128(idx.m, _mm_set1_epi32(static_cast<int>(0xFFFFFF00)));
|
|
|
|
__m128i result = _mm_shuffle_epi8(t0.m, idxx);
|
|
idxx = _mm_sub_epi8(idxx, _mm_set1_epi8(16));
|
|
|
|
__m128i result2 = _mm_shuffle_epi8(t1.m, idxx);
|
|
result = _mm_xor_si128(result, result2);
|
|
|
|
return vint4(result);
|
|
#else
|
|
alignas(ASTCENC_VECALIGN) uint8_t table[32];
|
|
storea(t0, reinterpret_cast<int*>(table + 0));
|
|
storea(t1, reinterpret_cast<int*>(table + 16));
|
|
|
|
return vint4(table[idx.lane<0>()],
|
|
table[idx.lane<1>()],
|
|
table[idx.lane<2>()],
|
|
table[idx.lane<3>()]);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* @brief Perform an 8-bit 64-entry table lookup, with 32-bit indexes.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vint4 vtable_8bt_32bi(vint4 t0, vint4 t1, vint4 t2, vint4 t3, vint4 idx)
|
|
{
|
|
#if ASTCENC_SSE >= 41
|
|
// Set index byte MSB to 1 for unused bytes so shuffle returns zero
|
|
__m128i idxx = _mm_or_si128(idx.m, _mm_set1_epi32(static_cast<int>(0xFFFFFF00)));
|
|
|
|
__m128i result = _mm_shuffle_epi8(t0.m, idxx);
|
|
idxx = _mm_sub_epi8(idxx, _mm_set1_epi8(16));
|
|
|
|
__m128i result2 = _mm_shuffle_epi8(t1.m, idxx);
|
|
result = _mm_xor_si128(result, result2);
|
|
idxx = _mm_sub_epi8(idxx, _mm_set1_epi8(16));
|
|
|
|
result2 = _mm_shuffle_epi8(t2.m, idxx);
|
|
result = _mm_xor_si128(result, result2);
|
|
idxx = _mm_sub_epi8(idxx, _mm_set1_epi8(16));
|
|
|
|
result2 = _mm_shuffle_epi8(t3.m, idxx);
|
|
result = _mm_xor_si128(result, result2);
|
|
|
|
return vint4(result);
|
|
#else
|
|
alignas(ASTCENC_VECALIGN) uint8_t table[64];
|
|
storea(t0, reinterpret_cast<int*>(table + 0));
|
|
storea(t1, reinterpret_cast<int*>(table + 16));
|
|
storea(t2, reinterpret_cast<int*>(table + 32));
|
|
storea(t3, reinterpret_cast<int*>(table + 48));
|
|
|
|
return vint4(table[idx.lane<0>()],
|
|
table[idx.lane<1>()],
|
|
table[idx.lane<2>()],
|
|
table[idx.lane<3>()]);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* @brief Return a vector of interleaved RGBA data.
|
|
*
|
|
* Input vectors have the value stored in the bottom 8 bits of each lane,
|
|
* with high bits set to zero.
|
|
*
|
|
* Output vector stores a single RGBA texel packed in each lane.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vint4 interleave_rgba8(vint4 r, vint4 g, vint4 b, vint4 a)
|
|
{
|
|
// Workaround an XCode compiler internal fault; note is slower than slli_epi32
|
|
// so we should revert this when we get the opportunity
|
|
#if defined(__APPLE__)
|
|
__m128i value = r.m;
|
|
value = _mm_add_epi32(value, _mm_bslli_si128(g.m, 1));
|
|
value = _mm_add_epi32(value, _mm_bslli_si128(b.m, 2));
|
|
value = _mm_add_epi32(value, _mm_bslli_si128(a.m, 3));
|
|
return vint4(value);
|
|
#else
|
|
__m128i value = r.m;
|
|
value = _mm_add_epi32(value, _mm_slli_epi32(g.m, 8));
|
|
value = _mm_add_epi32(value, _mm_slli_epi32(b.m, 16));
|
|
value = _mm_add_epi32(value, _mm_slli_epi32(a.m, 24));
|
|
return vint4(value);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* @brief Store a vector, skipping masked lanes.
|
|
*
|
|
* All masked lanes must be at the end of vector, after all non-masked lanes.
|
|
*/
|
|
ASTCENC_SIMD_INLINE void store_lanes_masked(int* base, vint4 data, vmask4 mask)
|
|
{
|
|
#if ASTCENC_AVX >= 2
|
|
_mm_maskstore_epi32(base, _mm_castps_si128(mask.m), data.m);
|
|
#else
|
|
// Note - we cannot use _mm_maskmoveu_si128 as the underlying hardware doesn't guarantee
|
|
// fault suppression on masked lanes so we can get page faults at the end of an image.
|
|
if (mask.lane<3>() != 0.0f)
|
|
{
|
|
store(data, base);
|
|
}
|
|
else if (mask.lane<2>() != 0.0f)
|
|
{
|
|
base[0] = data.lane<0>();
|
|
base[1] = data.lane<1>();
|
|
base[2] = data.lane<2>();
|
|
}
|
|
else if (mask.lane<1>() != 0.0f)
|
|
{
|
|
base[0] = data.lane<0>();
|
|
base[1] = data.lane<1>();
|
|
}
|
|
else if (mask.lane<0>() != 0.0f)
|
|
{
|
|
base[0] = data.lane<0>();
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#if defined(ASTCENC_NO_INVARIANCE) && (ASTCENC_SSE >= 41)
|
|
|
|
#define ASTCENC_USE_NATIVE_DOT_PRODUCT 1
|
|
|
|
/**
|
|
* @brief Return the dot product for the full 4 lanes, returning scalar.
|
|
*/
|
|
ASTCENC_SIMD_INLINE float dot_s(vfloat4 a, vfloat4 b)
|
|
{
|
|
return _mm_cvtss_f32(_mm_dp_ps(a.m, b.m, 0xFF));
|
|
}
|
|
|
|
/**
|
|
* @brief Return the dot product for the full 4 lanes, returning vector.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vfloat4 dot(vfloat4 a, vfloat4 b)
|
|
{
|
|
return vfloat4(_mm_dp_ps(a.m, b.m, 0xFF));
|
|
}
|
|
|
|
/**
|
|
* @brief Return the dot product for the bottom 3 lanes, returning scalar.
|
|
*/
|
|
ASTCENC_SIMD_INLINE float dot3_s(vfloat4 a, vfloat4 b)
|
|
{
|
|
return _mm_cvtss_f32(_mm_dp_ps(a.m, b.m, 0x77));
|
|
}
|
|
|
|
/**
|
|
* @brief Return the dot product for the bottom 3 lanes, returning vector.
|
|
*/
|
|
ASTCENC_SIMD_INLINE vfloat4 dot3(vfloat4 a, vfloat4 b)
|
|
{
|
|
return vfloat4(_mm_dp_ps(a.m, b.m, 0x77));
|
|
}
|
|
|
|
#endif // #if defined(ASTCENC_NO_INVARIANCE) && (ASTCENC_SSE >= 41)
|
|
|
|
#if ASTCENC_POPCNT >= 1
|
|
|
|
#define ASTCENC_USE_NATIVE_POPCOUNT 1
|
|
|
|
/**
|
|
* @brief Population bit count.
|
|
*
|
|
* @param v The value to population count.
|
|
*
|
|
* @return The number of 1 bits.
|
|
*/
|
|
ASTCENC_SIMD_INLINE int popcount(uint64_t v)
|
|
{
|
|
return static_cast<int>(_mm_popcnt_u64(v));
|
|
}
|
|
|
|
#endif // ASTCENC_POPCNT >= 1
|
|
|
|
#endif // #ifndef ASTC_VECMATHLIB_SSE_4_H_INCLUDED
|