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Added updated task launch implementation that now tracks task groups.

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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).
This commit is contained in:
Matt Pharr
2011-09-30 11:20:53 -07:00
parent 5ee4d7fce8
commit cb7976bbf6
43 changed files with 1309 additions and 1043 deletions
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26
examples/mandelbrot_tasks/mandelbrot.ispc
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@@ -53,11 +53,14 @@ mandel(float c_re, float c_im, int count) {
[ystart,yend).
*/
task void
mandelbrot_scanlines(uniform int ystart, uniform int yend,
mandelbrot_scanlines(uniform int ybase, uniform int span,
uniform float x0, uniform float dx,
uniform float y0, uniform float dy,
uniform int width, uniform int maxIterations,
reference uniform int output[]) {
uniform int ystart = ybase + taskIndex * span;
uniform int yend = ystart + span;
for (uniform int j = ystart; j < yend; ++j) {
for (uniform int i = 0; i < width; i += programCount) {
float x = x0 + (programIndex + i) * dx;
@@ -70,6 +73,20 @@ mandelbrot_scanlines(uniform int ystart, uniform int yend,
}
task void
mandelbrot_chunk(uniform float x0, uniform float dx,
uniform float y0, uniform float dy,
uniform int width, uniform int height,
uniform int maxIterations, reference uniform int output[]) {
uniform int ystart = taskIndex * (height/taskCount);
uniform int yend = (taskIndex+1) * (height/taskCount);
uniform int span = 1;
launch[(yend-ystart)/span] < mandelbrot_scanlines(ystart, span, x0, dx, y0, dy,
width, maxIterations, output) >;
}
export void
mandelbrot_ispc(uniform float x0, uniform float y0,
uniform float x1, uniform float y1,
@@ -78,9 +95,6 @@ mandelbrot_ispc(uniform float x0, uniform float y0,
uniform float dx = (x1 - x0) / width;
uniform float dy = (y1 - y0) / height;
/* Launch task to compute results for spans of 'span' scanlines. */
uniform int span = 2;
for (uniform int j = 0; j < height; j += span)
launch < mandelbrot_scanlines(j, j+span, x0, dx, y0, dy, width,
maxIterations, output) >;
launch[32] < mandelbrot_chunk(x0, dx, y0, dy, width, height,
maxIterations, output) >;
}