Fixed thread synchronization bug

a5e3869f · Peter Eastman · b1a22214 · a5e3869f
Commit a5e3869f authored Jan 27, 2010 by Peter Eastman
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Showing with 4 additions and 2 deletions

platforms/opencl/src/kernels/sort.cl platforms/opencl/src/kernels/sort.cl +4 -2

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--- a/platforms/opencl/src/kernels/sort.cl
+++ b/platforms/opencl/src/kernels/sort.cl
@@ -23,17 +23,19 @@ __kernel void computeRange(__global TYPE* data, int length, __global float2* ran
    // Now reduce them.

    buffer[get_local_id(0)] = minimum;
+    barrier(CLK_LOCAL_MEM_FENCE);
    for (int step = 1; step < get_local_size(0); step *= 2) {
        if (get_local_id(0)+step < get_local_size(0) && get_local_id(0)%(2*step) == 0)
            buffer[get_local_id(0)] = min(buffer[get_local_id(0)], buffer[get_local_id(0)+step]);
-            barrier(CLK_LOCAL_MEM_FENCE);
+        barrier(CLK_LOCAL_MEM_FENCE);
    }
    minimum = buffer[0];
    buffer[get_local_id(0)] = maximum;
+    barrier(CLK_LOCAL_MEM_FENCE);
    for (int step = 1; step < get_local_size(0); step *= 2) {
        if (get_local_id(0)+step < get_local_size(0) && get_local_id(0)%(2*step) == 0)
            buffer[get_local_id(0)] = max(buffer[get_local_id(0)], buffer[get_local_id(0)+step]);
-            barrier(CLK_LOCAL_MEM_FENCE);
+        barrier(CLK_LOCAL_MEM_FENCE);
    }
    maximum = buffer[0];
    if (get_local_id(0) == 0)