5d56b34807
Reland of #84991 A downstream overlay mode user ran into issues with the isnan macro not working in our sources with a specific libc configuration. This patch replaces the last direct includes of math.h with our internal math_macros.h, along with the necessary build system changes.
125 lines
4.2 KiB
C++
125 lines
4.2 KiB
C++
//===-- Unittests for exp -------------------------------------------------===//
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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 "include/llvm-libc-macros/math-macros.h"
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#include "src/__support/FPUtil/FPBits.h"
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#include "src/errno/libc_errno.h"
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#include "src/math/exp.h"
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#include "test/UnitTest/FPMatcher.h"
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#include "test/UnitTest/Test.h"
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#include "utils/MPFRWrapper/MPFRUtils.h"
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#include <errno.h>
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#include <stdint.h>
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using LlvmLibcExpTest = LIBC_NAMESPACE::testing::FPTest<double>;
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namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
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using LIBC_NAMESPACE::testing::tlog;
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TEST_F(LlvmLibcExpTest, SpecialNumbers) {
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EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::exp(aNaN));
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EXPECT_FP_EQ(inf, LIBC_NAMESPACE::exp(inf));
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EXPECT_FP_EQ_ALL_ROUNDING(zero, LIBC_NAMESPACE::exp(neg_inf));
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EXPECT_FP_EQ_WITH_EXCEPTION(zero, LIBC_NAMESPACE::exp(-0x1.0p20),
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FE_UNDERFLOW);
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EXPECT_FP_EQ_WITH_EXCEPTION(inf, LIBC_NAMESPACE::exp(0x1.0p20), FE_OVERFLOW);
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EXPECT_FP_EQ_ALL_ROUNDING(1.0, LIBC_NAMESPACE::exp(0.0));
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EXPECT_FP_EQ_ALL_ROUNDING(1.0, LIBC_NAMESPACE::exp(-0.0));
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}
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TEST_F(LlvmLibcExpTest, TrickyInputs) {
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constexpr int N = 14;
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constexpr uint64_t INPUTS[N] = {
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0x3FD79289C6E6A5C0,
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0x3FD05DE80A173EA0, // 0x1.05de80a173eap-2
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0xbf1eb7a4cb841fcc, // -0x1.eb7a4cb841fccp-14
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0xbf19a61fb925970d,
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0x3fda7b764e2cf47a, // 0x1.a7b764e2cf47ap-2
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0xc04757852a4b93aa, // -0x1.757852a4b93aap+5
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0x4044c19e5712e377, // x=0x1.4c19e5712e377p+5
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0xbf19a61fb925970d, // x=-0x1.9a61fb925970dp-14
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0xc039a74cdab36c28, // x=-0x1.9a74cdab36c28p+4
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0xc085b3e4e2e3bba9, // x=-0x1.5b3e4e2e3bba9p+9
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0xc086960d591aec34, // x=-0x1.6960d591aec34p+9
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0xc086232c09d58d91, // x=-0x1.6232c09d58d91p+9
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0xc0874910d52d3051, // x=-0x1.74910d52d3051p9
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0xc0867a172ceb0990, // x=-0x1.67a172ceb099p+9
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};
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for (int i = 0; i < N; ++i) {
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double x = FPBits(INPUTS[i]).get_val();
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EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp, x,
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LIBC_NAMESPACE::exp(x), 0.5);
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}
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}
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TEST_F(LlvmLibcExpTest, InDoubleRange) {
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constexpr uint64_t COUNT = 1'231;
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uint64_t START = LIBC_NAMESPACE::fputil::FPBits<double>(0.25).uintval();
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uint64_t STOP = LIBC_NAMESPACE::fputil::FPBits<double>(4.0).uintval();
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uint64_t STEP = (STOP - START) / COUNT;
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auto test = [&](mpfr::RoundingMode rounding_mode) {
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mpfr::ForceRoundingMode __r(rounding_mode);
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if (!__r.success)
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return;
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uint64_t fails = 0;
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uint64_t count = 0;
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uint64_t cc = 0;
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double mx, mr = 0.0;
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double tol = 0.5;
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for (uint64_t i = 0, v = START; i <= COUNT; ++i, v += STEP) {
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double x = FPBits(v).get_val();
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if (isnan(x) || isinf(x) || x < 0.0)
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continue;
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LIBC_NAMESPACE::libc_errno = 0;
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double result = LIBC_NAMESPACE::exp(x);
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++cc;
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if (isnan(result) || isinf(result))
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continue;
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++count;
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// ASSERT_MPFR_MATCH(mpfr::Operation::Log, x, result, 0.5);
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if (!TEST_MPFR_MATCH_ROUNDING_SILENTLY(mpfr::Operation::Exp, x, result,
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0.5, rounding_mode)) {
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++fails;
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while (!TEST_MPFR_MATCH_ROUNDING_SILENTLY(mpfr::Operation::Exp, x,
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result, tol, rounding_mode)) {
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mx = x;
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mr = result;
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if (tol > 1000.0)
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break;
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tol *= 2.0;
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}
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}
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}
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tlog << " Exp failed: " << fails << "/" << count << "/" << cc
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<< " tests.\n";
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tlog << " Max ULPs is at most: " << static_cast<uint64_t>(tol) << ".\n";
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if (fails) {
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EXPECT_MPFR_MATCH(mpfr::Operation::Exp, mx, mr, 0.5, rounding_mode);
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}
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};
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tlog << " Test Rounding To Nearest...\n";
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test(mpfr::RoundingMode::Nearest);
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tlog << " Test Rounding Downward...\n";
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test(mpfr::RoundingMode::Downward);
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tlog << " Test Rounding Upward...\n";
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test(mpfr::RoundingMode::Upward);
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tlog << " Test Rounding Toward Zero...\n";
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test(mpfr::RoundingMode::TowardZero);
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}
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