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/**
* @file llvector4a.cpp
* @brief SIMD vector implementation
*
* $LicenseInfo:firstyear=2010&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#include "llmemory.h"
#include "llmath.h"
#include "llquantize.h"
extern const LLQuad F_ZERO_4A = { 0, 0, 0, 0 };
extern const LLQuad F_APPROXIMATELY_ZERO_4A = {
F_APPROXIMATELY_ZERO,
F_APPROXIMATELY_ZERO,
F_APPROXIMATELY_ZERO,
F_APPROXIMATELY_ZERO
};
extern const LLVector4a LL_V4A_ZERO = reinterpret_cast<const LLVector4a&> ( F_ZERO_4A );
extern const LLVector4a LL_V4A_EPSILON = reinterpret_cast<const LLVector4a&> ( F_APPROXIMATELY_ZERO_4A );
/*static */void LLVector4a::memcpyNonAliased16(F32* __restrict dst, const F32* __restrict src, size_t bytes)
{
ll_memcpy_nonaliased_aligned_16((char*)dst, (char*)src, bytes);
}
void LLVector4a::setRotated( const LLRotation& rot, const LLVector4a& vec )
{
const LLVector4a col0 = rot.getColumn(0);
const LLVector4a col1 = rot.getColumn(1);
const LLVector4a col2 = rot.getColumn(2);
LLVector4a result = _mm_load_ss( vec.getF32ptr() );
result.splat<0>( result );
result.mul( col0 );
{
LLVector4a yyyy = _mm_load_ss( vec.getF32ptr() + 1 );
yyyy.splat<0>( yyyy );
yyyy.mul( col1 );
result.add( yyyy );
}
{
LLVector4a zzzz = _mm_load_ss( vec.getF32ptr() + 2 );
zzzz.splat<0>( zzzz );
zzzz.mul( col2 );
result.add( zzzz );
}
*this = result;
}
void LLVector4a::setRotated( const LLQuaternion2& quat, const LLVector4a& vec )
{
const LLVector4a& quatVec = quat.getVector4a();
LLVector4a temp; temp.setCross3(quatVec, vec);
temp.add( temp );
const LLVector4a realPart( quatVec.getScalarAt<3>() );
LLVector4a tempTimesReal; tempTimesReal.setMul( temp, realPart );
mQ = vec;
add( tempTimesReal );
LLVector4a imagCrossTemp; imagCrossTemp.setCross3( quatVec, temp );
add(imagCrossTemp);
}
void LLVector4a::quantize8( const LLVector4a& low, const LLVector4a& high )
{
LLVector4a val(mQ);
LLVector4a delta; delta.setSub( high, low );
{
val.clamp(low, high);
val.sub(low);
// 8-bit quantization means we can do with just 12 bits of reciprocal accuracy
const LLVector4a oneOverDelta = _mm_rcp_ps(delta.mQ);
// {
// static LL_ALIGN_16( const F32 F_TWO_4A[4] ) = { 2.f, 2.f, 2.f, 2.f };
// LLVector4a two; two.load4a( F_TWO_4A );
//
// // Here we use _mm_rcp_ps plus one round of newton-raphson
// // We wish to find 'x' such that x = 1/delta
// // As a first approximation, we take x0 = _mm_rcp_ps(delta)
// // Then x1 = 2 * x0 - a * x0^2 or x1 = x0 * ( 2 - a * x0 )
// // See Intel AP-803 http://ompf.org/!/Intel_application_note_AP-803.pdf
// const LLVector4a recipApprox = _mm_rcp_ps(delta.mQ);
// oneOverDelta.setMul( delta, recipApprox );
// oneOverDelta.setSub( two, oneOverDelta );
// oneOverDelta.mul( recipApprox );
// }
val.mul(oneOverDelta);
val.mul(*reinterpret_cast<const LLVector4a*>(F_U8MAX_4A));
}
val = _mm_cvtepi32_ps(_mm_cvtps_epi32( val.mQ ));
{
val.mul(*reinterpret_cast<const LLVector4a*>(F_OOU8MAX_4A));
val.mul(delta);
val.add(low);
}
{
LLVector4a maxError; maxError.setMul(delta, *reinterpret_cast<const LLVector4a*>(F_OOU8MAX_4A));
LLVector4a absVal; absVal.setAbs( val );
setSelectWithMask( absVal.lessThan( maxError ), F_ZERO_4A, val );
}
}
void LLVector4a::quantize16( const LLVector4a& low, const LLVector4a& high )
{
LLVector4a val(mQ);
LLVector4a delta; delta.setSub( high, low );
{
val.clamp(low, high);
val.sub(low);
// 16-bit quantization means we need a round of Newton-Raphson
LLVector4a oneOverDelta;
{
static LL_ALIGN_16( const F32 F_TWO_4A[4] ) = { 2.f, 2.f, 2.f, 2.f };
ll_assert_aligned(F_TWO_4A,16);
LLVector4a two; two.load4a( F_TWO_4A );
// Here we use _mm_rcp_ps plus one round of newton-raphson
// We wish to find 'x' such that x = 1/delta
// As a first approximation, we take x0 = _mm_rcp_ps(delta)
// Then x1 = 2 * x0 - a * x0^2 or x1 = x0 * ( 2 - a * x0 )
// See Intel AP-803 http://ompf.org/!/Intel_application_note_AP-803.pdf
const LLVector4a recipApprox = _mm_rcp_ps(delta.mQ);
oneOverDelta.setMul( delta, recipApprox );
oneOverDelta.setSub( two, oneOverDelta );
oneOverDelta.mul( recipApprox );
}
val.mul(oneOverDelta);
val.mul(*reinterpret_cast<const LLVector4a*>(F_U16MAX_4A));
}
val = _mm_cvtepi32_ps(_mm_cvtps_epi32( val.mQ ));
{
val.mul(*reinterpret_cast<const LLVector4a*>(F_OOU16MAX_4A));
val.mul(delta);
val.add(low);
}
{
LLVector4a maxError; maxError.setMul(delta, *reinterpret_cast<const LLVector4a*>(F_OOU16MAX_4A));
LLVector4a absVal; absVal.setAbs( val );
setSelectWithMask( absVal.lessThan( maxError ), F_ZERO_4A, val );
}
}
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