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[Backend] Support TMA lowering for arbitrary (swizzled) SMEM layout #2380

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Merged
LeiWang1999 merged 1 commit into from
Jun 18, 2026
+3,560 −216
Merged

[Backend] Support TMA lowering for arbitrary (swizzled) SMEM layout #2380

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3 changes: 1 addition & 2 deletions examples/gemm/example_gemm_intrinsics.py
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Original file line number Diff line number Diff line change
Expand Up @@ -17,8 +17,7 @@ def make_swizzle_layout(shared_buf):
return T.Layout(shape, lambda *args: args)

def transform_func(i, j):
new_warp_i, new_warp_j = get_swizzle_layout(i, j, shape[-1], dtype)
return [new_warp_i, new_warp_j]
return list(get_swizzle_layout(i, j, shape[-1], dtype))

return T.Layout(shape, transform_func)

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627 changes: 440 additions & 187 deletions src/cuda/op/copy.cc
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18 changes: 9 additions & 9 deletions src/cuda/transform/producer_consumer_ws.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,7 @@

#include "backend/common/target_utils.h"
#include "cuda/op/copy.h"
#include "layout/cute_layout.h"
#include "multi_version_buffer_rewriter.h"
#include "op/builtin.h"
#include "op/copy.h"
Expand Down Expand Up @@ -2620,15 +2621,14 @@ class ManualWSDetector : public StmtExprVisitor {
/// swizzle modes (32B / 64B / 128B). Any other layout (e.g. padded,
/// Volta-style) cannot be used with TMA.
static bool IsTmaCompatibleLayout(const Layout &layout, const Buffer &buffer) {
// Recognised swizzle → TMA with swizzle.
if (DetectSwizzleMode(layout, buffer) != SwizzleMode::kNone) {
return true;
}
// Identity / row-major linear → TMA without swizzle.
if (StructuralEqual()(layout, makeLinearLayout(buffer->shape))) {
return true;
}
return false;
Optional<cute::ComposedLayout> composed =
cute::ComposedLayoutFromTileLang(layout);
if (!composed.defined())
return false;
// Recast to byte space (the swizzle atom is defined on byte addresses).
cute::ComposedLayout composed_bytes =
composed.value().Recast(buffer->dtype.bits(), /*new_bits=*/8);
return composed_bytes->swizzle->IsTMACompatible();
}

class TiledWSCandidate : public StmtExprVisitor {
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