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//===-- Exhaustive tests for float -> bfloat16 conversion -----------------===//
//
// 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 "utils/MPFRWrapper/MPCommon.h"
using BFloat16 = LIBC_NAMESPACE::fputil::BFloat16;
namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
using MPFRNumber = LIBC_NAMESPACE::testing::mpfr::MPFRNumber;
template <typename InType>
struct Bfloat16ConversionChecker
: public virtual LIBC_NAMESPACE::testing::Test {
using FloatType = InType;
using FPBits = LIBC_NAMESPACE::fputil::FPBits<FloatType>;
using StorageType = typename FPBits::StorageType;
// Check in a range, return the number of failures.
// Slightly modified version of UnaryOpChecker.
uint64_t check(StorageType start, StorageType stop,
mpfr::RoundingMode rounding) {
mpfr::ForceRoundingMode r(rounding);
if (!r.success)
return (stop > start);
StorageType bits = start;
uint64_t failed = 0;
do {
FPBits x_bits(bits);
FloatType x = x_bits.get_val();
const BFloat16 libc_bfloat{x};
const BFloat16 mpfr_bfloat = MPFRNumber(x).as<BFloat16>();
const bool correct =
LIBC_NAMESPACE::testing::getMatcher<
LIBC_NAMESPACE::testing::TestCond::EQ>(mpfr_bfloat)
.match(libc_bfloat);
failed += (!correct);
} while (bits++ < stop);
return failed;
}
};
template <typename FloatType>
using LlvmLibcBfloat16ExhaustiveTest =
LlvmLibcExhaustiveMathTest<Bfloat16ConversionChecker<FloatType>>;
using LlvmLibcBfloat16FromFloatTest = LlvmLibcBfloat16ExhaustiveTest<float>;
// Positive Range: [0, Inf];
constexpr uint32_t POS_START = 0x0000'0000U;
constexpr uint32_t POS_STOP = 0x7f80'0000U;
// Negative Range: [-Inf, 0];
constexpr uint32_t NEG_START = 0xb000'0000U;
constexpr uint32_t NEG_STOP = 0xff80'0000U;
TEST_F(LlvmLibcBfloat16FromFloatTest, PostiveRange) {
test_full_range_all_roundings(POS_START, POS_STOP);
}
TEST_F(LlvmLibcBfloat16FromFloatTest, NegativeRange) {
test_full_range_all_roundings(NEG_START, NEG_STOP);
}
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