diff options
Diffstat (limited to 'benchmarks/CUDA/BlackScholes/BlackScholes_kernel.cuh')
| -rw-r--r-- | benchmarks/CUDA/BlackScholes/BlackScholes_kernel.cuh | 122 |
1 files changed, 0 insertions, 122 deletions
diff --git a/benchmarks/CUDA/BlackScholes/BlackScholes_kernel.cuh b/benchmarks/CUDA/BlackScholes/BlackScholes_kernel.cuh deleted file mode 100644 index d99f69a..0000000 --- a/benchmarks/CUDA/BlackScholes/BlackScholes_kernel.cuh +++ /dev/null @@ -1,122 +0,0 @@ -/* - * Copyright 1993-2007 NVIDIA Corporation. All rights reserved. - * - * NOTICE TO USER: - * - * This source code is subject to NVIDIA ownership rights under U.S. and - * international Copyright laws. Users and possessors of this source code - * are hereby granted a nonexclusive, royalty-free license to use this code - * in individual and commercial software. - * - * NVIDIA MAKES NO REPRESENTATION ABOUT THE SUITABILITY OF THIS SOURCE - * CODE FOR ANY PURPOSE. IT IS PROVIDED "AS IS" WITHOUT EXPRESS OR - * IMPLIED WARRANTY OF ANY KIND. NVIDIA DISCLAIMS ALL WARRANTIES WITH - * REGARD TO THIS SOURCE CODE, INCLUDING ALL IMPLIED WARRANTIES OF - * MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE. - * IN NO EVENT SHALL NVIDIA BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, - * OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS - * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE - * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE - * OR PERFORMANCE OF THIS SOURCE CODE. - * - * U.S. Government End Users. This source code is a "commercial item" as - * that term is defined at 48 C.F.R. 2.101 (OCT 1995), consisting of - * "commercial computer software" and "commercial computer software - * documentation" as such terms are used in 48 C.F.R. 12.212 (SEPT 1995) - * and is provided to the U.S. Government only as a commercial end item. - * Consistent with 48 C.F.R.12.212 and 48 C.F.R. 227.7202-1 through - * 227.7202-4 (JUNE 1995), all U.S. Government End Users acquire the - * source code with only those rights set forth herein. - * - * Any use of this source code in individual and commercial software must - * include, in the user documentation and internal comments to the code, - * the above Disclaimer and U.S. Government End Users Notice. - */ - - - -/////////////////////////////////////////////////////////////////////////////// -// Polynomial approximation of cumulative normal distribution function -/////////////////////////////////////////////////////////////////////////////// -__device__ inline float cndGPU(float d){ - const float A1 = 0.31938153f; - const float A2 = -0.356563782f; - const float A3 = 1.781477937f; - const float A4 = -1.821255978f; - const float A5 = 1.330274429f; - const float RSQRT2PI = 0.39894228040143267793994605993438f; - - float - K = 1.0f / (1.0f + 0.2316419f * fabsf(d)); - - float - cnd = RSQRT2PI * __expf(- 0.5f * d * d) * - (K * (A1 + K * (A2 + K * (A3 + K * (A4 + K * A5))))); - - if(d > 0) - cnd = 1.0f - cnd; - - return cnd; -} - - -/////////////////////////////////////////////////////////////////////////////// -// Black-Scholes formula for both call and put -/////////////////////////////////////////////////////////////////////////////// -__device__ inline void BlackScholesBodyGPU( - float& CallResult, - float& PutResult, - float S, //Stock price - float X, //Option strike - float T, //Option years - float R, //Riskless rate - float V //Volatility rate -){ - float sqrtT, expRT; - float d1, d2, CNDD1, CNDD2; - - sqrtT = sqrtf(T); - d1 = (__logf(S / X) + (R + 0.5f * V * V) * T) / (V * sqrtT); - d2 = d1 - V * sqrtT; - - CNDD1 = cndGPU(d1); - CNDD2 = cndGPU(d2); - - //Calculate Call and Put simultaneously - expRT = __expf(- R * T); - CallResult = S * CNDD1 - X * expRT * CNDD2; - PutResult = X * expRT * (1.0f - CNDD2) - S * (1.0f - CNDD1); -} - - -//////////////////////////////////////////////////////////////////////////////// -//Process an array of optN options on GPU -//////////////////////////////////////////////////////////////////////////////// -__global__ void BlackScholesGPU( - float *d_CallResult, - float *d_PutResult, - float *d_StockPrice, - float *d_OptionStrike, - float *d_OptionYears, - float Riskfree, - float Volatility, - int optN -){ - //Thread index - const int tid = blockDim.x * blockIdx.x + threadIdx.x; - //Total number of threads in execution grid - const int THREAD_N = blockDim.x * gridDim.x; - - //No matter how small is execution grid or how large OptN is, - //exactly OptN indices will be processed with perfect memory coalescing - for(int opt = tid; opt < optN; opt += THREAD_N) - BlackScholesBodyGPU( - d_CallResult[opt], - d_PutResult[opt], - d_StockPrice[opt], - d_OptionStrike[opt], - d_OptionYears[opt], - Riskfree, - Volatility - ); -} |
