Skip to content

[mlir][xegpu] Fix seg-fault caused by setting a null attribute #146002

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

Merged
merged 2 commits into from
Jul 1, 2025
Merged

[mlir][xegpu] Fix seg-fault caused by setting a null attribute #146002

Show file tree
Hide file tree
Changes from 1 commit
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
2e4bbeb
fix
chencha3 Jun 27, 2025
190e8f9
fix
chencha3 Jul 1, 2025
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
8 changes: 5 additions & 3 deletions mlir/lib/Dialect/XeGPU/Transforms/XeGPUWgToSgDistribute.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -376,10 +376,12 @@ struct WgToSgElementwiseOp : public ConversionPattern {
// Copy all attributes, but update "layout_result_0" to drop
// sgLayout/sgData
for (auto attr : op->getAttrs()) {
if (auto layout = dyn_cast<xegpu::LayoutAttr>(attr.getValue()))
state.addAttribute(attr.getName(), layout.dropSgLayoutAndData());
else
if (auto layout = dyn_cast<xegpu::LayoutAttr>(attr.getValue())) {
if (auto newLayout = layout.dropSgLayoutAndData())
Copy link

@Garra1980 Garra1980 Jun 27, 2025

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Is "else" required here?

Copy link
Contributor Author

@chencha3 chencha3 Jun 27, 2025 •
edited
Loading

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

I don't think so. if the newLayout is null, we don't need to keep it in the op

Copy link

@Garra1980 Garra1980 Jun 27, 2025

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Yeah, you're right, sorry for the noise

state.addAttribute(attr.getName(), newLayout);
} else {
state.addAttribute(attr.getName(), attr.getValue());
}
}
Operation *newOp = rewriter.create(state);
newResults.push_back(newOp->getResult(0));
Expand Down
19 changes: 19 additions & 0 deletions mlir/test/Dialect/XeGPU/xegpu-wg-to-sg-elemwise.mlir
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,6 +1,25 @@
// RUN: mlir-opt --xegpu-wg-to-sg-distribute -split-input-file %s | FileCheck %s

gpu.module @test_elementwise_ops {

// CHECK-LABEL: unary_ops_sg_layout_only
gpu.func @unary_ops_sg_layout_only(%a: memref<24x32xf32>) {
%tdesc_a = xegpu.create_nd_tdesc %a[0, 0] : memref<24x32xf32>
-> !xegpu.tensor_desc<24x32xf32, #xegpu.layout<sg_layout = [2, 4], sg_data = [12, 8]>>
%load_a = xegpu.load_nd %tdesc_a
: !xegpu.tensor_desc<24x32xf32, #xegpu.layout<sg_layout = [2, 4], sg_data = [12, 8]>>
-> vector<24x32xf32>
// CHECK: math.exp {{.*}} : vector<12x8xf32>
%exp = math.exp %load_a
{layout_result_0 = #xegpu.layout<sg_layout = [2, 4], sg_data = [12, 8]>}
: vector<24x32xf32>
// CHECK: arith.negf {{.*}} : vector<12x8xf32>
%negf = arith.negf %load_a
{layout_result_0 = #xegpu.layout<sg_layout = [2, 4], sg_data = [12, 8]>}
: vector<24x32xf32>
gpu.return
}

// CHECK-LABEL: unary_ops
gpu.func @unary_ops(%a: memref<24x32xf32>) {
%tdesc_a = xegpu.create_nd_tdesc %a[0, 0] : memref<24x32xf32>
Expand Down