[libc-commits] [libc] [libc] Add `lgamma` and `lgamma_r` stubs for the GPU (PR #102019)

[via libc-commits]

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@@ -0,0 +1,23 @@
+//===-- Implementation of the lgamma_r function for GPU -------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/math/lgamma_r.h"
+#include "src/__support/common.h"
+
+#include "declarations.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(double, lgamma_r, (double x, int *signp)) {
+  // The NVPTX device library does not export this, just pretend for now.
+  *signp = -1;
----------------
lntue wrote:

```
double result = __nv_lgamma(x);
*signp = (result < 0.0) ? -1 : 1;
return result;
```

https://github.com/llvm/llvm-project/pull/102019