================
@@ -159,6 +159,13 @@ class LLVM_LIBRARY_VISIBILITY NVPTXTargetInfo : public
TargetInfo {
Opts["cl_khr_global_int32_extended_atomics"] = true;
Opts["cl_khr_local_int32_base_atomics"] = true;
Opts["cl_khr_local_int32_extended_atomics"] = true;
+ // PTX supports 64-bit atomics natively on 64-bit targets even though the
+ // NVIDIA OpenCL runtime does not report these extensions. libclc needs
----------------
zjin-lcf wrote:
Good catch, thanks for checking on real hardware. You are right — the claim
came from the long-standing comment in intel/llvm, but your H100 `computeinfo`
output shows current NVIDIA drivers do report both extensions. I have dropped
that sentence; the comment now just explains that 64-bit atomics are natively
supported where `MaxAtomicInlineWidth` is the target pointer width, and that
libclc needs the extensions enabled to define the builtins.
https://github.com/llvm/llvm-project/pull/213691
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