pi_opencl_kernel.ocl (2520B)
1 /* 2 Copyright 2010-2011, D. E. Shaw Research. 3 All rights reserved. 4 5 Redistribution and use in source and binary forms, with or without 6 modification, are permitted provided that the following conditions are 7 met: 8 9 * Redistributions of source code must retain the above copyright 10 notice, this list of conditions, and the following disclaimer. 11 12 * Redistributions in binary form must reproduce the above copyright 13 notice, this list of conditions, and the following disclaimer in the 14 documentation and/or other materials provided with the distribution. 15 16 * Neither the name of D. E. Shaw Research nor the names of its 17 contributors may be used to endorse or promote products derived from 18 this software without specific prior written permission. 19 20 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 23 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 24 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 25 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 26 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 30 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 /* 33 * This file is the OpenCL kernel. It gets preprocessed, munged 34 * into a C string declaration and included in pi_opencl, so that 35 * running the compiled pi_opencl does not depend on any include 36 * files, paths etc. 37 */ 38 39 #include <Random123/threefry.h> 40 41 /* 42 * counthits generates n x,y points and returns hits[tid] with 43 * the count of number of those points within the unit circle on 44 * each thread. 45 */ 46 __kernel void counthits(unsigned n, unsigned useed, __global uint2 *hitsp) { 47 unsigned tid = get_global_id(0); 48 unsigned hits = 0, tries = 0; 49 threefry4x32_key_t k = {{tid, useed}}; 50 threefry4x32_ctr_t c = {{}}; // start counter from 0 51 while (tries < n) { 52 union { 53 threefry4x32_ctr_t c; 54 int4 i; 55 } u; 56 c.v[0]++; 57 u.c = threefry4x32(c, k); 58 long x1 = u.i.x, y1 = u.i.y; 59 long x2 = u.i.z, y2 = u.i.w; 60 if ((x1*x1 + y1*y1) < (1L<<62)) { 61 hits++; 62 } 63 tries++; 64 if ((x2*x2 + y2*y2) < (1L<<62)) { 65 hits++; 66 } 67 tries++; 68 } 69 hitsp[tid].x = hits; 70 hitsp[tid].y = tries; 71 }