[libc-commits] [libc] [libc][math] Add cbrtbf16 math function (PR #180327)

[via libc-commits]

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@@ -0,0 +1,35 @@
+//===-- Exhaustive test for cbrtbf16 --------------------------------------===//
+//
+// 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/__support/FPUtil/bfloat16.h"
+#include "src/math/cbrtbf16.h"
+#include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/Test.h"
+#include "utils/MPFRWrapper/MPFRUtils.h"
+
+using LlvmLibcCbrtbf16Test = LIBC_NAMESPACE::testing::FPTest<bfloat16>;
+
+namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
+
+// for the exhaustive test, we test with every 16-bit combination
+// and skip NaN cases. v is uint32_t to prevent integer overflow and
+// wraparound to 0.
+TEST_F(LlvmLibcCbrtbf16Test, Exhaustive) {
+  for (uint32_t v = 0x00000; v < 0x10000; ++v) {
+    bfloat16 x =
+        LIBC_NAMESPACE::fputil::FPBits<bfloat16>(static_cast<uint16_t>(v))
+            .get_val();
+
+    LIBC_NAMESPACE::fputil::FPBits<bfloat16> bits(x); // NaN checking
+    if (bits.is_nan())
+      continue;
+
+    EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Cbrt, x,
+                                   LIBC_NAMESPACE::cbrtbf16(x), 0.5);
+  }
+}
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sohail103 wrote:

thank you, fixed in latest push

https://github.com/llvm/llvm-project/pull/180327