[libc-commits] [libc] [libc][math][c++23] Add Fmabf16 math function (PR #182836)

[Anton Shepelev via libc-commits]

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@@ -0,0 +1,69 @@
+//===-- Exhaustive test for fmabf16 ---------------------------------------===//
+//
+// 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/fmabf16.h"
+#include "test/UnitTest/FPMatcher.h"
+#include "test/UnitTest/Test.h"
+#include "utils/MPFRWrapper/MPFRUtils.h"
+
+using LlvmLibcFmaBf16Test = LIBC_NAMESPACE::testing::FPTest<bfloat16>;
+
+namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
+
+// subnormal range (negative)
+static constexpr uint16_t SUBNORM_NEG_START = 0x8001U;
+static constexpr uint16_t SUBNORM_NEG_STOP = 0x807FU;
+
+TEST_F(LlvmLibcFmaBf16Test, SubnormalNegativeRange) {
+  const bfloat16 z_values[] = {zero,    neg_zero,   inf,
+                               neg_inf, min_normal, max_normal};
+  for (uint16_t v1 = SUBNORM_NEG_START; v1 <= SUBNORM_NEG_STOP; v1++) {
+    for (uint16_t v2 = SUBNORM_NEG_START; v2 <= SUBNORM_NEG_STOP; v2++) {
+
+      bfloat16 x = FPBits(v1).get_val();
+      bfloat16 y = FPBits(v2).get_val();
+      for (bfloat16 z : z_values) {
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amemov wrote:

more a nit, but:
`for (const bfloat16& z: z_values)` or `for (const auto& z: z_values)` since the test is not modifying those 

https://github.com/llvm/llvm-project/pull/182836