[libc-commits] [libc] [libc][stdfix] Add integer square root with fixed point output functions. (PR #83959)

[via libc-commits]

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@@ -0,0 +1,66 @@
+//===-- Utility class to test integer sqrt ----------------------*- C++ -*-===//
+//
+// 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 "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/Test.h"
+
+#include "src/__support/CPP/bit.h"
+#include "src/__support/FPUtil/BasicOperations.h"
+#include "src/__support/FPUtil/sqrt.h"
+#include "src/__support/fixed_point/fx_rep.h"
+#include "src/__support/fixed_point/sqrt.h"
+
+template <typename T> class ISqrtTest : public LIBC_NAMESPACE::testing::Test {
+
+  using OutType =
+      typename LIBC_NAMESPACE::fixed_point::internal::SqrtConfig<T>::OutType;
+  using FXRep = LIBC_NAMESPACE::fixed_point::FXRep<OutType>;
+  static constexpr OutType zero = FXRep::ZERO();
+  static constexpr OutType one = static_cast<OutType>(1);
+  static constexpr OutType eps = FXRep::EPS();
+
+public:
+  typedef OutType (*SqrtFunc)(T);
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lntue wrote:

Yes, the fast math implementations are explicitly added in `uhksqrtus_test.cpp` and `uksqrtui_test.cpp`.

https://github.com/llvm/llvm-project/pull/83959