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- /* StarPU --- Runtime system for heterogeneous multicore architectures.
- *
- * Copyright (C) 2010, 2011, 2012 CNRS
- *
- * StarPU 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; either version 2.1 of the License, or (at
- * your option) any later version.
- *
- * StarPU 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 in COPYING.LGPL for more details.
- */
- /*
- * This example complements vector_scal.c: here we implement a CPU version.
- */
- #ifndef __VECTOR_SCAL_CPU_TEMPLATE_H__
- #define __VECTOR_SCAL_CPU_TEMPLATE_H__
- #include <starpu.h>
- #ifdef __SSE__
- #include <xmmintrin.h>
- #endif
- /* This kernel takes a buffer and scales it by a constant factor */
- #define VECTOR_SCAL_CPU_FUNC(func_name) \
- void func_name(void *buffers[], void *cl_arg) \
- { \
- unsigned i; \
- float *factor = (float *) cl_arg; \
- \
- /* \
- * The "buffers" array matches the task->handles array: for instance \
- * task->handles[0] is a handle that corresponds to a data with \
- * vector "interface", so that the first entry of the array in the \
- * codelet is a pointer to a structure describing such a vector (ie. \
- * struct starpu_vector_interface *). Here, we therefore manipulate \
- * the buffers[0] element as a vector: nx gives the number of elements \
- * in the array, ptr gives the location of the array (that was possibly \
- * migrated/replicated), and elemsize gives the size of each elements. \
- */ \
- \
- struct starpu_vector_interface *vector = (struct starpu_vector_interface *) buffers[0]; \
- \
- /* length of the vector */ \
- unsigned n = STARPU_VECTOR_GET_NX(vector); \
- \
- /* get a pointer to the local copy of the vector : note that we have to \
- * cast it in (float *) since a vector could contain any type of \
- * elements so that the .ptr field is actually a uintptr_t */ \
- float *val = (float *)STARPU_VECTOR_GET_PTR(vector); \
- \
- /* scale the vector */ \
- for (i = 0; i < n; i++) \
- val[i] *= *factor; \
- }
- #ifdef __SSE__
- #define VECTOR_SCAL_SSE_FUNC(func_name) \
- void func_name(void *buffers[], void *cl_arg) \
- { \
- float *vector = (float *) STARPU_VECTOR_GET_PTR(buffers[0]); \
- unsigned int n = STARPU_VECTOR_GET_NX(buffers[0]); \
- unsigned int n_iterations = n/4; \
- \
- __m128 *VECTOR = (__m128*) vector; \
- __m128 FACTOR STARPU_ATTRIBUTE_ALIGNED(16); \
- float factor = *(float *) cl_arg; \
- FACTOR = _mm_set1_ps(factor); \
- \
- unsigned int i; \
- for (i = 0; i < n_iterations; i++) \
- VECTOR[i] = _mm_mul_ps(FACTOR, VECTOR[i]); \
- \
- unsigned int remainder = n%4; \
- if (remainder != 0) \
- { \
- unsigned int start = 4 * n_iterations; \
- for (i = start; i < start+remainder; ++i) \
- { \
- vector[i] = factor * vector[i]; \
- } \
- } \
- }
- #else /* !__SSE__ */
- #define VECTOR_SCAL_SSE_FUNC(func_name)
- #endif /* !__SSE__ */
- #endif /* !__VECTOR_SCAL_CPU_TEMPLATE_H__ */
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