[Mlir-commits] [mlir] [mlir][gpu] Fix bug with GPU hardware intrinsic global location (PR #144923)

[Adam Straw]

https://github.com/adstraw created https://github.com/llvm/llvm-project/pull/144923

Bug description: Hardware intrinsic functions created during GPU conversion to NVVM may contain debug info metadata from the original function which cannot be used out of that function.

>From 16057b1de88f9b02afa72c649e97f355e8ddd000 Mon Sep 17 00:00:00 2001
From: Adam Straw <astraw at nvidia.com>
Date: Thu, 19 Jun 2025 09:21:11 -0700
Subject: [PATCH] [mlir][gpu] Fix bug with GPU hardware intrinsic global
 location

---
 mlir/lib/Conversion/GPUCommon/OpToFuncCallLowering.h     | 3 ++-
 .../test/Conversion/GPUToNVVM/gpu-to-nvvm-debuginfo.mlir | 9 +++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/mlir/lib/Conversion/GPUCommon/OpToFuncCallLowering.h b/mlir/lib/Conversion/GPUCommon/OpToFuncCallLowering.h
index 34150c4d13085..a4ef98b7a9195 100644
--- a/mlir/lib/Conversion/GPUCommon/OpToFuncCallLowering.h
+++ b/mlir/lib/Conversion/GPUCommon/OpToFuncCallLowering.h
@@ -164,7 +164,8 @@ struct OpToFuncCallLowering : public ConvertOpToLLVMPattern<SourceOp> {
     auto parentFunc = op->getParentOfType<FunctionOpInterface>();
     assert(parentFunc && "expected there to be a parent function");
     OpBuilder b(parentFunc);
-    return b.create<LLVMFuncOp>(op->getLoc(), funcName, funcType);
+    auto globalloc = op->getLoc()->findInstanceOfOrUnknown<FileLineColLoc>();
+    return b.create<LLVMFuncOp>(globalloc, funcName, funcType);
   }
 
   StringRef getFunctionName(Type type, SourceOp op) const {
diff --git a/mlir/test/Conversion/GPUToNVVM/gpu-to-nvvm-debuginfo.mlir b/mlir/test/Conversion/GPUToNVVM/gpu-to-nvvm-debuginfo.mlir
index 08c5800fe93b3..5304abfb09a1e 100644
--- a/mlir/test/Conversion/GPUToNVVM/gpu-to-nvvm-debuginfo.mlir
+++ b/mlir/test/Conversion/GPUToNVVM/gpu-to-nvvm-debuginfo.mlir
@@ -23,3 +23,12 @@ gpu.module @test_module_1 {
     gpu.return
   }
 }
+
+// Check that debug info metadata from the function is removed from the global location.
+gpu.module @test_module_2 {
+  // CHECK-DAG: llvm.func @__nv_abs(i32) -> i32 loc([[LOC]])
+  func.func @gpu_abs_with_loc(%arg_i32 : i32) -> (i32) {
+    %result32 = math.absi %arg_i32 : i32 loc(fused<#di_subprogram>[#loc])
+    func.return %result32 : i32
+  }
+}