chore: add exahaustive tests for fmodbf16 math function

Signed-off-by: Krishna Pandey <[email protected]>

Author: krishna2803

libc/test/src/math/exhaustive/CMakeLists.txt

@@ -377,6 +377,22 @@ add_fp_unittest(
     -lpthread
 )
 
+add_fp_unittest(
+  fmodbf16_test
+  NO_RUN_POSTBUILD
+  NEED_MPFR
+  SUITE
+    libc_math_exhaustive_tests
+  SRCS
+    fmodbf16_test.cpp
+  DEPENDS
+    .exhaustive_test
+    libc.src.math.fmodbf16
+    libc.src.__support.FPUtil.bfloat16
+  LINK_LIBRARIES
+    -lpthread
+)
+
 add_fp_unittest(
   coshf_test
   NO_RUN_POSTBUILD

libc/test/src/math/exhaustive/fmodbf16_test.cpp

@@ -0,0 +1,42 @@
+//===-- Exhaustive test for fmodbf16 --------------------------------------===//
+//
+// 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 "exhaustive_test.h"
+#include "src/__support/FPUtil/bfloat16.h"
+#include "src/math/fmodbf16.h"
+#include "utils/MPFRWrapper/MPFRUtils.h"
+
+namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
+
+using LlvmLibcFmodf16ExhaustiveTest =
+    LlvmLibcBinaryOpExhaustiveMathTest<bfloat16, mpfr::Operation::Fmod,
+                                       LIBC_NAMESPACE::fmodbf16>;
+
+// range: [0, inf]
+static constexpr uint16_t POS_START = 0x0000U;
+static constexpr uint16_t POS_STOP = 0x7f80U;
+
+// range: [-0, -inf]
+static constexpr uint16_t NEG_START = 0x8000U;
+static constexpr uint16_t NEG_STOP = 0xff80U;
+
+TEST_F(LlvmLibcFmodf16ExhaustiveTest, PostivePositiveRange) {
+  test_full_range_all_roundings(POS_START, POS_STOP, POS_START, POS_STOP);
+}
+
+TEST_F(LlvmLibcFmodf16ExhaustiveTest, PostiveNegativeRange) {
+  test_full_range_all_roundings(POS_START, POS_STOP, NEG_START, NEG_STOP);
+}
+
+TEST_F(LlvmLibcFmodf16ExhaustiveTest, NegativePositiveRange) {
+  test_full_range_all_roundings(NEG_START, NEG_STOP, POS_START, POS_STOP);
+}
+
+TEST_F(LlvmLibcFmodf16ExhaustiveTest, NegativeNegativeRange) {
+  test_full_range_all_roundings(NEG_START, NEG_STOP, POS_START, POS_STOP);
+}