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.
135 lines
4.5 KiB
C++
135 lines
4.5 KiB
C++
//===-- Unittests for expm1f-----------------------------------------------===//
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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/expm1f.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 <stdint.h>
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using LlvmLibcExpm1fTest = LIBC_NAMESPACE::testing::FPTest<float>;
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namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
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TEST_F(LlvmLibcExpm1fTest, SpecialNumbers) {
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LIBC_NAMESPACE::libc_errno = 0;
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EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::expm1f(aNaN));
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EXPECT_MATH_ERRNO(0);
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EXPECT_FP_EQ(inf, LIBC_NAMESPACE::expm1f(inf));
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EXPECT_MATH_ERRNO(0);
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EXPECT_FP_EQ(-1.0f, LIBC_NAMESPACE::expm1f(neg_inf));
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EXPECT_MATH_ERRNO(0);
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EXPECT_FP_EQ(0.0f, LIBC_NAMESPACE::expm1f(0.0f));
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EXPECT_MATH_ERRNO(0);
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EXPECT_FP_EQ(-0.0f, LIBC_NAMESPACE::expm1f(-0.0f));
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EXPECT_MATH_ERRNO(0);
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}
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TEST_F(LlvmLibcExpm1fTest, Overflow) {
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LIBC_NAMESPACE::libc_errno = 0;
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EXPECT_FP_EQ_WITH_EXCEPTION(
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inf, LIBC_NAMESPACE::expm1f(FPBits(0x7f7fffffU).get_val()), FE_OVERFLOW);
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EXPECT_MATH_ERRNO(ERANGE);
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EXPECT_FP_EQ_WITH_EXCEPTION(
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inf, LIBC_NAMESPACE::expm1f(FPBits(0x42cffff8U).get_val()), FE_OVERFLOW);
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EXPECT_MATH_ERRNO(ERANGE);
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EXPECT_FP_EQ_WITH_EXCEPTION(
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inf, LIBC_NAMESPACE::expm1f(FPBits(0x42d00008U).get_val()), FE_OVERFLOW);
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EXPECT_MATH_ERRNO(ERANGE);
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}
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TEST_F(LlvmLibcExpm1fTest, Underflow) {
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LIBC_NAMESPACE::libc_errno = 0;
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EXPECT_FP_EQ(-1.0f, LIBC_NAMESPACE::expm1f(FPBits(0xff7fffffU).get_val()));
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float x = FPBits(0xc2cffff8U).get_val();
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EXPECT_FP_EQ(-1.0f, LIBC_NAMESPACE::expm1f(x));
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x = FPBits(0xc2d00008U).get_val();
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EXPECT_FP_EQ(-1.0f, LIBC_NAMESPACE::expm1f(x));
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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_F(LlvmLibcExpm1fTest, Borderline) {
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float x;
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LIBC_NAMESPACE::libc_errno = 0;
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x = FPBits(0x42affff8U).get_val();
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ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Expm1, x,
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LIBC_NAMESPACE::expm1f(x), 0.5);
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EXPECT_MATH_ERRNO(0);
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x = FPBits(0x42b00008U).get_val();
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ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Expm1, x,
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LIBC_NAMESPACE::expm1f(x), 0.5);
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EXPECT_MATH_ERRNO(0);
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x = FPBits(0xc2affff8U).get_val();
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ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Expm1, x,
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LIBC_NAMESPACE::expm1f(x), 0.5);
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EXPECT_MATH_ERRNO(0);
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x = FPBits(0xc2b00008U).get_val();
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ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Expm1, x,
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LIBC_NAMESPACE::expm1f(x), 0.5);
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EXPECT_MATH_ERRNO(0);
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x = FPBits(0x3dc252ddU).get_val();
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ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Expm1, x,
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LIBC_NAMESPACE::expm1f(x), 0.5);
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EXPECT_MATH_ERRNO(0);
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x = FPBits(0x3e35bec5U).get_val();
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ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Expm1, x,
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LIBC_NAMESPACE::expm1f(x), 0.5);
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EXPECT_MATH_ERRNO(0);
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x = FPBits(0x942ed494U).get_val();
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ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Expm1, x,
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LIBC_NAMESPACE::expm1f(x), 0.5);
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EXPECT_MATH_ERRNO(0);
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x = FPBits(0xbdc1c6cbU).get_val();
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ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Expm1, x,
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LIBC_NAMESPACE::expm1f(x), 0.5);
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EXPECT_MATH_ERRNO(0);
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}
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TEST_F(LlvmLibcExpm1fTest, InFloatRange) {
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constexpr uint32_t COUNT = 100'000;
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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 = FPBits(v).get_val();
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if (isnan(x) || isinf(x))
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continue;
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LIBC_NAMESPACE::libc_errno = 0;
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float result = LIBC_NAMESPACE::expm1f(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) || LIBC_NAMESPACE::libc_errno != 0)
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continue;
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ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Expm1, x,
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LIBC_NAMESPACE::expm1f(x), 0.5);
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}
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}
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