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241 lines
9 KiB
C++
241 lines
9 KiB
C++
/******************************************************************************
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* $Id: gdalgridsse.cpp 28033 2014-11-30 16:37:24Z rouault $
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*
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* Project: GDAL Gridding API.
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* Purpose: Implementation of GDAL scattered data gridder.
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* Author: Even Rouault, <even dot rouault at mines dash paris dot org>
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*
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******************************************************************************
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* Copyright (c) 2013, Even Rouault <even dot rouault at mines-paris dot org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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****************************************************************************/
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#include "gdalgrid.h"
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#include "gdalgrid_priv.h"
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#ifdef HAVE_SSE_AT_COMPILE_TIME
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#include <xmmintrin.h>
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CPL_CVSID("$Id: gdalgridsse.cpp 28033 2014-11-30 16:37:24Z rouault $");
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/************************************************************************/
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/* CPLHaveRuntimeSSE() */
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/************************************************************************/
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#define CPUID_SSE_EDX_BIT 25
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#if (defined(_M_X64) || defined(__x86_64))
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int CPLHaveRuntimeSSE()
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{
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return TRUE;
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}
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#elif defined(__GNUC__) && defined(__i386__)
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int CPLHaveRuntimeSSE()
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{
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int cpuinfo[4] = {0,0,0,0};
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GCC_CPUID(1, cpuinfo[0], cpuinfo[1], cpuinfo[2], cpuinfo[3]);
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return (cpuinfo[3] & (1 << CPUID_SSE_EDX_BIT)) != 0;
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}
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#elif defined(_MSC_VER) && defined(_M_IX86)
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#if _MSC_VER <= 1310
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static void inline __cpuid(int cpuinfo[4], int level)
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{
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__asm
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{
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push ebx
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push esi
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mov esi,cpuinfo
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mov eax,level
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cpuid
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mov dword ptr [esi], eax
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mov dword ptr [esi+4],ebx
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mov dword ptr [esi+8],ecx
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mov dword ptr [esi+0Ch],edx
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pop esi
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pop ebx
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}
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}
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#else
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#include <intrin.h>
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#endif
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int CPLHaveRuntimeSSE()
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{
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int cpuinfo[4] = {0,0,0,0};
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__cpuid(cpuinfo, 1);
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return (cpuinfo[3] & (1 << CPUID_SSE_EDX_BIT)) != 0;
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}
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#else
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int CPLHaveRuntimeSSE()
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{
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return FALSE;
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}
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#endif
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/************************************************************************/
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/* GDALGridInverseDistanceToAPower2NoSmoothingNoSearchSSE() */
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/************************************************************************/
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CPLErr
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GDALGridInverseDistanceToAPower2NoSmoothingNoSearchSSE(
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const void *poOptions,
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GUInt32 nPoints,
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CPL_UNUSED const double *unused_padfX,
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CPL_UNUSED const double *unused_padfY,
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CPL_UNUSED const double *unused_padfZ,
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double dfXPoint, double dfYPoint,
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double *pdfValue,
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void* hExtraParamsIn )
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{
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size_t i = 0;
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GDALGridExtraParameters* psExtraParams = (GDALGridExtraParameters*) hExtraParamsIn;
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const float* pafX = psExtraParams->pafX;
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const float* pafY = psExtraParams->pafY;
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const float* pafZ = psExtraParams->pafZ;
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const float fEpsilon = 0.0000000000001f;
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const float fXPoint = (float)dfXPoint;
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const float fYPoint = (float)dfYPoint;
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const __m128 xmm_small = _mm_load1_ps((float*)&fEpsilon);
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const __m128 xmm_x = _mm_load1_ps((float*)&fXPoint);
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const __m128 xmm_y = _mm_load1_ps((float*)&fYPoint);
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__m128 xmm_nominator = _mm_setzero_ps();
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__m128 xmm_denominator = _mm_setzero_ps();
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int mask = 0;
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#if defined(__x86_64) || defined(_M_X64)
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/* This would also work in 32bit mode, but there are only 8 XMM registers */
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/* whereas we have 16 for 64bit */
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#define LOOP_SIZE 8
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size_t nPointsRound = (nPoints / LOOP_SIZE) * LOOP_SIZE;
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for ( i = 0; i < nPointsRound; i += LOOP_SIZE )
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{
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__m128 xmm_rx = _mm_sub_ps(_mm_load_ps(pafX + i), xmm_x); /* rx = pafX[i] - fXPoint */
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__m128 xmm_rx_4 = _mm_sub_ps(_mm_load_ps(pafX + i + 4), xmm_x);
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__m128 xmm_ry = _mm_sub_ps(_mm_load_ps(pafY + i), xmm_y); /* ry = pafY[i] - fYPoint */
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__m128 xmm_ry_4 = _mm_sub_ps(_mm_load_ps(pafY + i + 4), xmm_y);
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__m128 xmm_r2 = _mm_add_ps(_mm_mul_ps(xmm_rx, xmm_rx), /* r2 = rx * rx + ry * ry */
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_mm_mul_ps(xmm_ry, xmm_ry));
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__m128 xmm_r2_4 = _mm_add_ps(_mm_mul_ps(xmm_rx_4, xmm_rx_4),
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_mm_mul_ps(xmm_ry_4, xmm_ry_4));
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__m128 xmm_invr2 = _mm_rcp_ps(xmm_r2); /* invr2 = 1.0f / r2 */
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__m128 xmm_invr2_4 = _mm_rcp_ps(xmm_r2_4);
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xmm_nominator = _mm_add_ps(xmm_nominator, /* nominator += invr2 * pafZ[i] */
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_mm_mul_ps(xmm_invr2, _mm_load_ps(pafZ + i)));
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xmm_nominator = _mm_add_ps(xmm_nominator,
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_mm_mul_ps(xmm_invr2_4, _mm_load_ps(pafZ + i + 4)));
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xmm_denominator = _mm_add_ps(xmm_denominator, xmm_invr2); /* denominator += invr2 */
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xmm_denominator = _mm_add_ps(xmm_denominator, xmm_invr2_4);
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mask = _mm_movemask_ps(_mm_cmplt_ps(xmm_r2, xmm_small)) | /* if( r2 < fEpsilon) */
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(_mm_movemask_ps(_mm_cmplt_ps(xmm_r2_4, xmm_small)) << 4);
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if( mask )
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break;
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}
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#else
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#define LOOP_SIZE 4
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size_t nPointsRound = (nPoints / LOOP_SIZE) * LOOP_SIZE;
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for ( i = 0; i < nPointsRound; i += LOOP_SIZE )
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{
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__m128 xmm_rx = _mm_sub_ps(_mm_load_ps((float*)pafX + i), xmm_x); /* rx = pafX[i] - fXPoint */
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__m128 xmm_ry = _mm_sub_ps(_mm_load_ps((float*)pafY + i), xmm_y); /* ry = pafY[i] - fYPoint */
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__m128 xmm_r2 = _mm_add_ps(_mm_mul_ps(xmm_rx, xmm_rx), /* r2 = rx * rx + ry * ry */
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_mm_mul_ps(xmm_ry, xmm_ry));
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__m128 xmm_invr2 = _mm_rcp_ps(xmm_r2); /* invr2 = 1.0f / r2 */
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xmm_nominator = _mm_add_ps(xmm_nominator, /* nominator += invr2 * pafZ[i] */
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_mm_mul_ps(xmm_invr2, _mm_load_ps((float*)pafZ + i)));
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xmm_denominator = _mm_add_ps(xmm_denominator, xmm_invr2); /* denominator += invr2 */
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mask = _mm_movemask_ps(_mm_cmplt_ps(xmm_r2, xmm_small)); /* if( r2 < fEpsilon) */
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if( mask )
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break;
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}
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#endif
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/* Find which i triggered r2 < fEpsilon */
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if( mask )
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{
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for(int j = 0; j < LOOP_SIZE; j++ )
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{
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if( mask & (1 << j) )
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{
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(*pdfValue) = (pafZ)[i + j];
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return CE_None;
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}
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}
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}
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/* Get back nominator and denominator values for XMM registers */
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float afNominator[4], afDenominator[4];
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_mm_storeu_ps(afNominator, xmm_nominator);
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_mm_storeu_ps(afDenominator, xmm_denominator);
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float fNominator = afNominator[0] + afNominator[1] +
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afNominator[2] + afNominator[3];
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float fDenominator = afDenominator[0] + afDenominator[1] +
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afDenominator[2] + afDenominator[3];
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/* Do the few remaining loop iterations */
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for ( ; i < nPoints; i++ )
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{
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const float fRX = pafX[i] - fXPoint;
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const float fRY = pafY[i] - fYPoint;
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const float fR2 =
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fRX * fRX + fRY * fRY;
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// If the test point is close to the grid node, use the point
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// value directly as a node value to avoid singularity.
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if ( fR2 < 0.0000000000001 )
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{
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break;
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}
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else
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{
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const float fInvR2 = 1.0f / fR2;
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fNominator += fInvR2 * pafZ[i];
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fDenominator += fInvR2;
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}
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}
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if( i != nPoints )
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{
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(*pdfValue) = pafZ[i];
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}
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else
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if ( fDenominator == 0.0 )
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{
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(*pdfValue) =
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((GDALGridInverseDistanceToAPowerOptions*)poOptions)->dfNoDataValue;
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}
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else
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(*pdfValue) = fNominator / fDenominator;
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return CE_None;
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}
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#endif /* HAVE_SSE_AT_COMPILE_TIME */
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