[mlir][ArmSME] Prefix SME streaming attributes with "llvm." for propagation#190864
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[mlir][ArmSME] Prefix SME streaming attributes with "llvm." for propagation#190864
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joker-eph
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@llvm/pr-subscribers-mlir Author: Mehdi Amini (joker-eph) ChangesFunction-level attributes enabling SME in the backend (e.g. arm_streaming, arm_locally_streaming) were dropped when converting func.func to llvm.func after ed37bdc, because attribute propagation during FuncToLLVM conversion only preserves attributes prefixed with "llvm.". Prefix these discardable attributes accordingly. Full diff: https://github.com/llvm/llvm-project/pull/190864.diff 2 Files Affected:
diff --git a/mlir/lib/Dialect/ArmSME/Transforms/EnableArmStreaming.cpp b/mlir/lib/Dialect/ArmSME/Transforms/EnableArmStreaming.cpp
index eafdc1de5ef34..8d14bff3b5875 100644
--- a/mlir/lib/Dialect/ArmSME/Transforms/EnableArmStreaming.cpp
+++ b/mlir/lib/Dialect/ArmSME/Transforms/EnableArmStreaming.cpp
@@ -128,7 +128,9 @@ struct EnableArmStreamingPass
auto unitAttr = UnitAttr::get(&getContext());
- function->setAttr(stringifyArmStreamingMode(streamingMode), unitAttr);
+ function->setDiscardableAttr(
+ (Twine("llvm.") + stringifyArmStreamingMode(streamingMode)).str(),
+ unitAttr);
// The pass currently only supports enabling ZA when in streaming-mode, but
// ZA can be accessed by the SME LDR, STR and ZERO instructions when not in
diff --git a/mlir/test/Dialect/ArmSME/enable-arm-streaming.mlir b/mlir/test/Dialect/ArmSME/enable-arm-streaming.mlir
index 00b38b86f0d6e..087cc98edbdd6 100644
--- a/mlir/test/Dialect/ArmSME/enable-arm-streaming.mlir
+++ b/mlir/test/Dialect/ArmSME/enable-arm-streaming.mlir
@@ -6,42 +6,42 @@
// RUN: mlir-opt %s -enable-arm-streaming=if-scalable-and-supported -verify-diagnostics | FileCheck %s -check-prefix=IF-SCALABLE
// CHECK-LABEL: @arm_streaming
-// CHECK-SAME: attributes {arm_streaming}
+// CHECK-SAME: attributes {llvm.arm_streaming}
// CHECK-LOCALLY-LABEL: @arm_streaming
-// CHECK-LOCALLY-SAME: attributes {arm_locally_streaming}
+// CHECK-LOCALLY-SAME: attributes {llvm.arm_locally_streaming}
// CHECK-COMPATIBLE-LABEL: @arm_streaming
-// CHECK-COMPATIBLE-SAME: attributes {arm_streaming_compatible}
+// CHECK-COMPATIBLE-SAME: attributes {llvm.arm_streaming_compatible}
// CHECK-ENABLE-ZA-LABEL: @arm_streaming
-// CHECK-ENABLE-ZA-SAME: attributes {arm_new_za, arm_streaming}
+// CHECK-ENABLE-ZA-SAME: attributes {llvm.arm_new_za, llvm.arm_streaming}
func.func @arm_streaming() { return }
// CHECK-LABEL: @not_arm_streaming
-// CHECK-SAME: attributes {enable_arm_streaming_ignore}
+// CHECK-SAME: attributes {llvm.enable_arm_streaming_ignore}
// CHECK-LOCALLY-LABEL: @not_arm_streaming
-// CHECK-LOCALLY-SAME: attributes {enable_arm_streaming_ignore}
+// CHECK-LOCALLY-SAME: attributes {llvm.enable_arm_streaming_ignore}
// CHECK-COMPATIBLE-LABEL: @not_arm_streaming
-// CHECK-COMPATIBLE-SAME: attributes {enable_arm_streaming_ignore}
+// CHECK-COMPATIBLE-SAME: attributes {llvm.enable_arm_streaming_ignore}
// CHECK-ENABLE-ZA-LABEL: @not_arm_streaming
-// CHECK-ENABLE-ZA-SAME: attributes {enable_arm_streaming_ignore}
-func.func @not_arm_streaming() attributes {enable_arm_streaming_ignore} { return }
+// CHECK-ENABLE-ZA-SAME: attributes {llvm.enable_arm_streaming_ignore}
+func.func @not_arm_streaming() attributes {llvm.enable_arm_streaming_ignore} { return }
// CHECK-LABEL: @requires_arm_streaming
-// CHECK-SAME: attributes {arm_streaming}
+// CHECK-SAME: attributes {llvm.arm_streaming}
// IF-REQUIRED: @requires_arm_streaming
-// IF-REQUIRED-SAME: attributes {arm_streaming}
+// IF-REQUIRED-SAME: attributes {llvm.arm_streaming}
func.func @requires_arm_streaming() {
%tile = arm_sme.get_tile : vector<[4]x[4]xi32>
return
}
// CHECK-LABEL: @does_not_require_arm_streaming
-// CHECK-SAME: attributes {arm_streaming}
+// CHECK-SAME: attributes {llvm.arm_streaming}
// IF-REQUIRED: @does_not_require_arm_streaming
// IF-REQUIRED-NOT: arm_streaming
func.func @does_not_require_arm_streaming() { return }
// IF-SCALABLE-LABEL: @contains_scalable_vectors
-// IF-SCALABLE-SAME: attributes {arm_streaming}
+// IF-SCALABLE-SAME: attributes {llvm.arm_streaming}
func.func @contains_scalable_vectors(%vec: vector<[4]xf32>) -> vector<[4]xf32> {
%0 = arith.addf %vec, %vec : vector<[4]xf32>
return %0 : vector<[4]xf32>
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Member
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@llvm/pr-subscribers-mlir-sme Author: Mehdi Amini (joker-eph) ChangesFunction-level attributes enabling SME in the backend (e.g. arm_streaming, arm_locally_streaming) were dropped when converting func.func to llvm.func after ed37bdc, because attribute propagation during FuncToLLVM conversion only preserves attributes prefixed with "llvm.". Prefix these discardable attributes accordingly. Full diff: https://github.com/llvm/llvm-project/pull/190864.diff 2 Files Affected:
diff --git a/mlir/lib/Dialect/ArmSME/Transforms/EnableArmStreaming.cpp b/mlir/lib/Dialect/ArmSME/Transforms/EnableArmStreaming.cpp
index eafdc1de5ef34..8d14bff3b5875 100644
--- a/mlir/lib/Dialect/ArmSME/Transforms/EnableArmStreaming.cpp
+++ b/mlir/lib/Dialect/ArmSME/Transforms/EnableArmStreaming.cpp
@@ -128,7 +128,9 @@ struct EnableArmStreamingPass
auto unitAttr = UnitAttr::get(&getContext());
- function->setAttr(stringifyArmStreamingMode(streamingMode), unitAttr);
+ function->setDiscardableAttr(
+ (Twine("llvm.") + stringifyArmStreamingMode(streamingMode)).str(),
+ unitAttr);
// The pass currently only supports enabling ZA when in streaming-mode, but
// ZA can be accessed by the SME LDR, STR and ZERO instructions when not in
diff --git a/mlir/test/Dialect/ArmSME/enable-arm-streaming.mlir b/mlir/test/Dialect/ArmSME/enable-arm-streaming.mlir
index 00b38b86f0d6e..087cc98edbdd6 100644
--- a/mlir/test/Dialect/ArmSME/enable-arm-streaming.mlir
+++ b/mlir/test/Dialect/ArmSME/enable-arm-streaming.mlir
@@ -6,42 +6,42 @@
// RUN: mlir-opt %s -enable-arm-streaming=if-scalable-and-supported -verify-diagnostics | FileCheck %s -check-prefix=IF-SCALABLE
// CHECK-LABEL: @arm_streaming
-// CHECK-SAME: attributes {arm_streaming}
+// CHECK-SAME: attributes {llvm.arm_streaming}
// CHECK-LOCALLY-LABEL: @arm_streaming
-// CHECK-LOCALLY-SAME: attributes {arm_locally_streaming}
+// CHECK-LOCALLY-SAME: attributes {llvm.arm_locally_streaming}
// CHECK-COMPATIBLE-LABEL: @arm_streaming
-// CHECK-COMPATIBLE-SAME: attributes {arm_streaming_compatible}
+// CHECK-COMPATIBLE-SAME: attributes {llvm.arm_streaming_compatible}
// CHECK-ENABLE-ZA-LABEL: @arm_streaming
-// CHECK-ENABLE-ZA-SAME: attributes {arm_new_za, arm_streaming}
+// CHECK-ENABLE-ZA-SAME: attributes {llvm.arm_new_za, llvm.arm_streaming}
func.func @arm_streaming() { return }
// CHECK-LABEL: @not_arm_streaming
-// CHECK-SAME: attributes {enable_arm_streaming_ignore}
+// CHECK-SAME: attributes {llvm.enable_arm_streaming_ignore}
// CHECK-LOCALLY-LABEL: @not_arm_streaming
-// CHECK-LOCALLY-SAME: attributes {enable_arm_streaming_ignore}
+// CHECK-LOCALLY-SAME: attributes {llvm.enable_arm_streaming_ignore}
// CHECK-COMPATIBLE-LABEL: @not_arm_streaming
-// CHECK-COMPATIBLE-SAME: attributes {enable_arm_streaming_ignore}
+// CHECK-COMPATIBLE-SAME: attributes {llvm.enable_arm_streaming_ignore}
// CHECK-ENABLE-ZA-LABEL: @not_arm_streaming
-// CHECK-ENABLE-ZA-SAME: attributes {enable_arm_streaming_ignore}
-func.func @not_arm_streaming() attributes {enable_arm_streaming_ignore} { return }
+// CHECK-ENABLE-ZA-SAME: attributes {llvm.enable_arm_streaming_ignore}
+func.func @not_arm_streaming() attributes {llvm.enable_arm_streaming_ignore} { return }
// CHECK-LABEL: @requires_arm_streaming
-// CHECK-SAME: attributes {arm_streaming}
+// CHECK-SAME: attributes {llvm.arm_streaming}
// IF-REQUIRED: @requires_arm_streaming
-// IF-REQUIRED-SAME: attributes {arm_streaming}
+// IF-REQUIRED-SAME: attributes {llvm.arm_streaming}
func.func @requires_arm_streaming() {
%tile = arm_sme.get_tile : vector<[4]x[4]xi32>
return
}
// CHECK-LABEL: @does_not_require_arm_streaming
-// CHECK-SAME: attributes {arm_streaming}
+// CHECK-SAME: attributes {llvm.arm_streaming}
// IF-REQUIRED: @does_not_require_arm_streaming
// IF-REQUIRED-NOT: arm_streaming
func.func @does_not_require_arm_streaming() { return }
// IF-SCALABLE-LABEL: @contains_scalable_vectors
-// IF-SCALABLE-SAME: attributes {arm_streaming}
+// IF-SCALABLE-SAME: attributes {llvm.arm_streaming}
func.func @contains_scalable_vectors(%vec: vector<[4]xf32>) -> vector<[4]xf32> {
%0 = arith.addf %vec, %vec : vector<[4]xf32>
return %0 : vector<[4]xf32>
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…gation Function-level attributes enabling SME in the backend (e.g. arm_streaming, arm_locally_streaming) were dropped when converting func.func to llvm.func after ed37bdc, because attribute propagation during FuncToLLVM conversion only preserves attributes prefixed with "llvm.". Prefix these discardable attributes accordingly.
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lgtm |
banach-space
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Apr 8, 2026
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LGTM, thanks!
Btw, I am working on introducing a dedicated buildbot for this sort of stuff. As usual, these things take time.
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Function-level attributes enabling SME in the backend (e.g. arm_streaming, arm_locally_streaming) were dropped when converting func.func to llvm.func after ed37bdc, because attribute propagation during FuncToLLVM conversion only preserves attributes prefixed with "llvm.". Prefix these discardable attributes accordingly.