cb7976bbf6
Within each function that launches tasks, we now can easily track which tasks that function launched, so that the sync at the end of the function can just sync on the tasks launched by that function (not all tasks launched by all functions.) Implementing this led to a rework of the task system API that ispc generates code to call; the example task systems in examples/tasksys.cpp have been updated to conform to this API. (The updated API is also documented in the ispc user's guide.) As part of this, "launch[n]" syntax was added to launch a number of tasks in a single launch statement, rather than requiring a loop over 'n' to launch n tasks. This commit thus fixes issue #84 (enhancement to launch multiple tasks from a single launch statement) as well as issue #105 (recursive task launches were broken).
101 lines
3.8 KiB
Plaintext
101 lines
3.8 KiB
Plaintext
/*
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Copyright (c) 2010-2011, Intel Corporation
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of Intel Corporation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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static inline int
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mandel(float c_re, float c_im, int count) {
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float z_re = c_re, z_im = c_im;
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int i;
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for (i = 0; i < count; ++i) {
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if (z_re * z_re + z_im * z_im > 4.)
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break;
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float new_re = z_re*z_re - z_im*z_im;
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float new_im = 2.f * z_re * z_im;
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z_re = c_re + new_re;
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z_im = c_im + new_im;
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}
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return i;
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}
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/* Task to compute the Mandelbrot iterations for a span of scanlines from
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[ystart,yend).
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*/
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task void
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mandelbrot_scanlines(uniform int ybase, uniform int span,
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uniform float x0, uniform float dx,
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uniform float y0, uniform float dy,
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uniform int width, uniform int maxIterations,
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reference uniform int output[]) {
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uniform int ystart = ybase + taskIndex * span;
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uniform int yend = ystart + span;
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for (uniform int j = ystart; j < yend; ++j) {
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for (uniform int i = 0; i < width; i += programCount) {
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float x = x0 + (programIndex + i) * dx;
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float y = y0 + j * dy;
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int index = j * width + i + programIndex;
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output[index] = mandel(x, y, maxIterations);
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}
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}
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}
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task void
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mandelbrot_chunk(uniform float x0, uniform float dx,
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uniform float y0, uniform float dy,
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uniform int width, uniform int height,
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uniform int maxIterations, reference uniform int output[]) {
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uniform int ystart = taskIndex * (height/taskCount);
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uniform int yend = (taskIndex+1) * (height/taskCount);
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uniform int span = 1;
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launch[(yend-ystart)/span] < mandelbrot_scanlines(ystart, span, x0, dx, y0, dy,
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width, maxIterations, output) >;
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}
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export void
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mandelbrot_ispc(uniform float x0, uniform float y0,
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uniform float x1, uniform float y1,
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uniform int width, uniform int height,
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uniform int maxIterations, reference uniform int output[]) {
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uniform float dx = (x1 - x0) / width;
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uniform float dy = (y1 - y0) / height;
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launch[32] < mandelbrot_chunk(x0, dx, y0, dy, width, height,
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maxIterations, output) >;
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}
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