trunc_test.cpp
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//===-- Unittests for trunc -----------------------------------------------===//
//
// 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 "include/math.h"
#include "src/math/trunc.h"
#include "utils/FPUtil/BitPatterns.h"
#include "utils/FPUtil/FloatOperations.h"
#include "utils/FPUtil/FloatProperties.h"
#include "utils/MPFRWrapper/MPFRUtils.h"
#include "utils/UnitTest/Test.h"
using __llvm_libc::fputil::valueAsBits;
using __llvm_libc::fputil::valueFromBits;
using BitPatterns = __llvm_libc::fputil::BitPatterns<double>;
using Properties = __llvm_libc::fputil::FloatProperties<double>;
namespace mpfr = __llvm_libc::testing::mpfr;
// Zero tolerance; As in, exact match with MPFR result.
static constexpr mpfr::Tolerance tolerance{mpfr::Tolerance::doublePrecision, 0,
0};
TEST(TruncTest, SpecialNumbers) {
EXPECT_EQ(
BitPatterns::aQuietNaN,
valueAsBits(__llvm_libc::trunc(valueFromBits(BitPatterns::aQuietNaN))));
EXPECT_EQ(BitPatterns::aNegativeQuietNaN,
valueAsBits(__llvm_libc::trunc(
valueFromBits(BitPatterns::aNegativeQuietNaN))));
EXPECT_EQ(BitPatterns::aSignallingNaN,
valueAsBits(__llvm_libc::trunc(
valueFromBits(BitPatterns::aSignallingNaN))));
EXPECT_EQ(BitPatterns::aNegativeSignallingNaN,
valueAsBits(__llvm_libc::trunc(
valueFromBits(BitPatterns::aNegativeSignallingNaN))));
EXPECT_EQ(BitPatterns::inf,
valueAsBits(__llvm_libc::trunc(valueFromBits(BitPatterns::inf))));
EXPECT_EQ(BitPatterns::negInf, valueAsBits(__llvm_libc::trunc(
valueFromBits(BitPatterns::negInf))));
EXPECT_EQ(BitPatterns::zero,
valueAsBits(__llvm_libc::trunc(valueFromBits(BitPatterns::zero))));
EXPECT_EQ(BitPatterns::negZero, valueAsBits(__llvm_libc::trunc(
valueFromBits(BitPatterns::negZero))));
}
TEST(TruncTest, RoundedNumbers) {
EXPECT_EQ(valueAsBits(1.0), valueAsBits(__llvm_libc::trunc(1.0)));
EXPECT_EQ(valueAsBits(-1.0), valueAsBits(__llvm_libc::trunc(-1.0)));
EXPECT_EQ(valueAsBits(10.0), valueAsBits(__llvm_libc::trunc(10.0)));
EXPECT_EQ(valueAsBits(-10.0), valueAsBits(__llvm_libc::trunc(-10.0)));
EXPECT_EQ(valueAsBits(12345.0), valueAsBits(__llvm_libc::trunc(12345.0)));
EXPECT_EQ(valueAsBits(-12345.0), valueAsBits(__llvm_libc::trunc(-12345.0)));
}
TEST(truncTest, InDoubleRange) {
using BitsType = Properties::BitsType;
constexpr BitsType count = 1000000;
constexpr BitsType step = UINT64_MAX / count;
for (BitsType i = 0, v = 0; i <= count; ++i, v += step) {
double x = valueFromBits(v);
if (isnan(x) || isinf(x))
continue;
ASSERT_MPFR_MATCH(mpfr::Operation::Trunc, x, __llvm_libc::trunc(x),
tolerance);
}
}