[Openmp-commits] [openmp] [libc] [amdgpu][openmp] Treat missing TIMESTAMP_FREQUENCY as non-fatal (PR #70987)

[Jon Chesterfield via Openmp-commits]

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@@ -1810,10 +1810,12 @@ struct AMDGPUDeviceTy : public GenericDeviceTy, AMDGenericDeviceTy {
       return Err;
     GridValues.GV_Warp_Size = WavefrontSize;
 
-    // Get the frequency of the steady clock.
-    if (auto Err = getDeviceAttr(HSA_AMD_AGENT_INFO_TIMESTAMP_FREQUENCY,
-                                 ClockFrequency))
-      return Err;
+    // Get the frequency of the steady clock. If the attribute is missing
+    // assume running on an older libhsa and default to 0, omp_get_wtime
+    // will be inaccurate but otherwise programs can still run.
+    if (auto Err = getDeviceAttrRaw(HSA_AMD_AGENT_INFO_TIMESTAMP_FREQUENCY,
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JonChesterfield wrote:

If the enum field is missing, no compilation, no progress. I don't think there's a reasonable way to reflect on whether an enum field is present or not (i.e. no `#ifdef` equivalent).

However the enum field is present in the dynamic_hsa header, so openmp compiles just fine against that.

https://github.com/llvm/llvm-project/pull/70987