Skip to content

[TOPI][CUDA] Fix topk/sort gridDim overflow by remapping grid axes in sort_ir #19900

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
cchung100m wants to merge 2 commits into
base: main
Choose a base branch
from
+7 −5
Open

[TOPI][CUDA] Fix topk/sort gridDim overflow by remapping grid axes in sort_ir #19900

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
26cddfa
[TOPI][CUDA] Fix topk/sort gridDim.y overflow by moving the width-blo…
cchung100m Jun 28, 2026
b84daff
[TOPI][CUDA] Fix topk/sort gridDim overflow by remapping grid axes in…
cchung100m Jun 29, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
12 changes: 7 additions & 5 deletions python/tvm/topi/gpu/sort.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -499,17 +499,19 @@ def dual_mergepath(
nbx = tvm.tirx.generic.cast(ceil_div(width, max_threads * thread_work), "int32")
nbz = tvm.tirx.generic.cast(ceil_div(size, width), "int32")

tx, bx, by, _, _, _ = _get_threads(ntx, nbx, nthread_by * nbz)
tx = te.thread_axis("threadIdx.x")
bx = te.thread_axis("blockIdx.z") # nbx
by = te.thread_axis("blockIdx.y") # batch
bz = te.thread_axis("blockIdx.x") # nbz (largest extent)
with T.frame_scope(
[
T.attr(tx, "thread_extent", ntx),
T.attr(bx, "thread_extent", nbx),
T.attr(by, "thread_extent", nthread_by * nbz),
T.attr(by, "thread_extent", nthread_by),
T.attr(bz, "thread_extent", nbz),
]
):
by_val = by % nthread_by
bz = by // nthread_by
base_idx = by_val * size
base_idx = by * size

# calculate the start, mid, and end points of this section
start_pos = width * bz
Expand Down
Loading