internal static void WarpBarrierKernel(ArrayView <int> data)
{
var idx = Grid.GlobalIndex.X;
Warp.Barrier();
data[idx] = idx;
}
internal static void WarpBarrierKernel(ArrayView1D <int, Stride1D.Dense> data)
{
var idx = Grid.GlobalIndex.X;
Warp.Barrier();
data[idx] = idx;
}
internal static void WarpBarrierKernel(
GroupedIndex index,
ArrayView <int> data)
{
var idx = index.GridIdx * Group.DimensionX + index.GroupIdx;
Warp.Barrier();
data[idx] = idx;
}
internal static void DivergentWarpBarrierKernel(
ArrayView1D <int, Stride1D.Dense> data)
{
// Divergent warp execution involving barriers
var sharedMemory = ILGPU.SharedMemory.Allocate <int>(4);
switch (Warp.WarpIdx)
{
case 0:
sharedMemory[0] = 0;
Warp.Barrier();
break;
case 1:
sharedMemory[1] = 1;
Warp.Barrier();
break;
case 2:
sharedMemory[2] = 2;
Warp.Barrier();
break;
case 3:
sharedMemory[3] = 3;
Warp.Barrier();
break;
}
// Warp wide barrier
int value = Warp.LaneIdx;
Warp.Barrier();
// Read shared memory
int index = Grid.GlobalIndex.X;
data[index] = sharedMemory[Warp.WarpIdx] * Warp.WarpSize + value;
}
/// <summary> /// Performs a warp-wide barrier. /// </summary> public readonly void Barrier() => Warp.Barrier();