150 lines
4.7 KiB
C++
150 lines
4.7 KiB
C++
//===-- Unittests for exp2f -----------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "src/math/exp2f.h"
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#include "utils/FPUtil/BitPatterns.h"
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#include "utils/FPUtil/ClassificationFunctions.h"
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#include "utils/FPUtil/FloatOperations.h"
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#include "utils/FPUtil/FloatProperties.h"
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#include "utils/MPFRWrapper/MPFRUtils.h"
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#include "utils/UnitTest/Test.h"
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#include <math.h>
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#include <errno.h>
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#include <stdint.h>
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using __llvm_libc::fputil::isNegativeQuietNaN;
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using __llvm_libc::fputil::isQuietNaN;
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using __llvm_libc::fputil::valueAsBits;
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using __llvm_libc::fputil::valueFromBits;
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using BitPatterns = __llvm_libc::fputil::BitPatterns<float>;
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namespace mpfr = __llvm_libc::testing::mpfr;
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TEST(LlvmLibcexp2fTest, SpecialNumbers) {
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errno = 0;
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EXPECT_TRUE(
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isQuietNaN(__llvm_libc::exp2f(valueFromBits(BitPatterns::aQuietNaN))));
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EXPECT_EQ(errno, 0);
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EXPECT_TRUE(isNegativeQuietNaN(
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__llvm_libc::exp2f(valueFromBits(BitPatterns::aNegativeQuietNaN))));
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EXPECT_EQ(errno, 0);
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EXPECT_TRUE(isQuietNaN(
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__llvm_libc::exp2f(valueFromBits(BitPatterns::aSignallingNaN))));
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EXPECT_EQ(errno, 0);
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EXPECT_TRUE(isNegativeQuietNaN(
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__llvm_libc::exp2f(valueFromBits(BitPatterns::aNegativeSignallingNaN))));
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EXPECT_EQ(errno, 0);
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EXPECT_EQ(BitPatterns::inf,
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valueAsBits(__llvm_libc::exp2f(valueFromBits(BitPatterns::inf))));
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EXPECT_EQ(errno, 0);
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EXPECT_EQ(BitPatterns::zero, valueAsBits(__llvm_libc::exp2f(
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valueFromBits(BitPatterns::negInf))));
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EXPECT_EQ(errno, 0);
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EXPECT_EQ(BitPatterns::one,
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valueAsBits(__llvm_libc::exp2f(valueFromBits(BitPatterns::zero))));
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EXPECT_EQ(errno, 0);
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EXPECT_EQ(BitPatterns::one, valueAsBits(__llvm_libc::exp2f(
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valueFromBits(BitPatterns::negZero))));
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EXPECT_EQ(errno, 0);
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}
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TEST(LlvmLibcExpfTest, Overflow) {
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errno = 0;
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EXPECT_EQ(BitPatterns::inf,
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valueAsBits(__llvm_libc::exp2f(valueFromBits(0x7f7fffffU))));
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EXPECT_EQ(errno, ERANGE);
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errno = 0;
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EXPECT_EQ(BitPatterns::inf,
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valueAsBits(__llvm_libc::exp2f(valueFromBits(0x43000000U))));
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EXPECT_EQ(errno, ERANGE);
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errno = 0;
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EXPECT_EQ(BitPatterns::inf,
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valueAsBits(__llvm_libc::exp2f(valueFromBits(0x43000001U))));
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EXPECT_EQ(errno, ERANGE);
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}
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// Test with inputs which are the borders of underflow/overflow but still
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// produce valid results without setting errno.
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TEST(LlvmLibcExpfTest, Borderline) {
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float x;
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errno = 0;
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x = valueFromBits(0x42fa0001U);
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EXPECT_MPFR_MATCH(mpfr::Operation::Exp2, x, __llvm_libc::exp2f(x), 1.0);
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EXPECT_EQ(errno, 0);
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x = valueFromBits(0x42ffffffU);
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EXPECT_MPFR_MATCH(mpfr::Operation::Exp2, x, __llvm_libc::exp2f(x), 1.0);
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EXPECT_EQ(errno, 0);
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x = valueFromBits(0xc2fa0001U);
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EXPECT_MPFR_MATCH(mpfr::Operation::Exp2, x, __llvm_libc::exp2f(x), 1.0);
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EXPECT_EQ(errno, 0);
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x = valueFromBits(0xc2fc0000U);
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EXPECT_MPFR_MATCH(mpfr::Operation::Exp2, x, __llvm_libc::exp2f(x), 1.0);
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EXPECT_EQ(errno, 0);
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x = valueFromBits(0xc2fc0001U);
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EXPECT_MPFR_MATCH(mpfr::Operation::Exp2, x, __llvm_libc::exp2f(x), 1.0);
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EXPECT_EQ(errno, 0);
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x = valueFromBits(0xc3150000U);
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EXPECT_MPFR_MATCH(mpfr::Operation::Exp2, x, __llvm_libc::exp2f(x), 1.0);
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EXPECT_EQ(errno, 0);
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}
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TEST(LlvmLibcExpfTest, Underflow) {
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errno = 0;
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EXPECT_EQ(BitPatterns::zero,
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valueAsBits(__llvm_libc::exp2f(valueFromBits(0xff7fffffU))));
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EXPECT_EQ(errno, ERANGE);
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errno = 0;
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float x = valueFromBits(0xc3158000U);
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EXPECT_MPFR_MATCH(mpfr::Operation::Exp2, x, __llvm_libc::exp2f(x), 1.0);
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EXPECT_EQ(errno, ERANGE);
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errno = 0;
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x = valueFromBits(0xc3165432U);
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EXPECT_MPFR_MATCH(mpfr::Operation::Exp2, x, __llvm_libc::exp2f(x), 1.0);
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EXPECT_EQ(errno, ERANGE);
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}
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TEST(LlvmLibcexp2fTest, InFloatRange) {
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constexpr uint32_t count = 1000000;
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constexpr uint32_t step = UINT32_MAX / count;
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for (uint32_t i = 0, v = 0; i <= count; ++i, v += step) {
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float x = valueFromBits(v);
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if (isnan(x) || isinf(x))
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continue;
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errno = 0;
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float result = __llvm_libc::exp2f(x);
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// If the computation resulted in an error or did not produce valid result
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// in the single-precision floating point range, then ignore comparing with
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// MPFR result as MPFR can still produce valid results because of its
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// wider precision.
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if (isnan(result) || isinf(result) || errno != 0)
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continue;
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ASSERT_MPFR_MATCH(mpfr::Operation::Exp2, x, __llvm_libc::exp2f(x), 1.0);
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}
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}
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