5748ad84e5
Context: https://github.com/llvm/llvm-project/pull/87017 - Add proxy header `libc/hdr/math_macros.h` that will: - include `<math.h>` in overlay mode, - include `"include/llvm-libc-macros/math-macros.h"` in full build mode. - Its corresponding CMake target `libc.hdr.math_macros` will only depend on `libc.include.math` and `libc.include.llvm-libc-macros.math_macros` in full build mode. - Replace all `#include "include/llvm-libc-macros/math-macros.h"` with `#include "hdr/math_macros.h"`. - Add dependency to `libc.hdr.math_macros` CMake target when using `add_fp_unittest`. - Update the remaining dependency. - Update bazel overlay: add `libc:hdr_math_macros` target, and replacing all dependency on `libc:llvm_libc_macros_math_macros` with `libc:hdr_math_macros`.
88 lines
3.1 KiB
C++
88 lines
3.1 KiB
C++
//===-- Unittests for x86 long double -------------------------------------===//
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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/__support/FPUtil/FPBits.h"
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#include "test/UnitTest/Test.h"
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#include "hdr/math_macros.h"
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using FPBits = LIBC_NAMESPACE::fputil::FPBits<long double>;
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TEST(LlvmLibcX86LongDoubleTest, is_nan) {
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// In the nan checks below, we use the macro isnan from math.h to ensure that
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// a number is actually a NaN. The isnan macro resolves to the compiler
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// builtin function. Hence, matching LLVM-libc's notion of NaN with the
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// isnan result ensures that LLVM-libc's behavior matches the compiler's
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// behavior.
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constexpr uint32_t COUNT = 100'000;
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FPBits bits(0.0l);
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bits.set_biased_exponent(FPBits::MAX_BIASED_EXPONENT);
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for (unsigned int i = 0; i < COUNT; ++i) {
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// If exponent has the max value and the implicit bit is 0,
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// then the number is a NaN for all values of mantissa.
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bits.set_mantissa(i);
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long double nan = bits.get_val();
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ASSERT_NE(static_cast<int>(isnan(nan)), 0);
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ASSERT_TRUE(bits.is_nan());
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}
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bits.set_implicit_bit(1);
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for (unsigned int i = 1; i < COUNT; ++i) {
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// If exponent has the max value and the implicit bit is 1,
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// then the number is a NaN for all non-zero values of mantissa.
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// Note the initial value of |i| of 1 to avoid a zero mantissa.
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bits.set_mantissa(i);
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long double nan = bits.get_val();
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ASSERT_NE(static_cast<int>(isnan(nan)), 0);
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ASSERT_TRUE(bits.is_nan());
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}
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bits.set_biased_exponent(1);
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bits.set_implicit_bit(0);
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for (unsigned int i = 0; i < COUNT; ++i) {
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// If exponent is non-zero and also not max, and the implicit bit is 0,
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// then the number is a NaN for all values of mantissa.
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bits.set_mantissa(i);
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long double nan = bits.get_val();
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ASSERT_NE(static_cast<int>(isnan(nan)), 0);
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ASSERT_TRUE(bits.is_nan());
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}
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bits.set_biased_exponent(1);
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bits.set_implicit_bit(1);
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for (unsigned int i = 0; i < COUNT; ++i) {
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// If exponent is non-zero and also not max, and the implicit bit is 1,
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// then the number is normal value for all values of mantissa.
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bits.set_mantissa(i);
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long double valid = bits.get_val();
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ASSERT_EQ(static_cast<int>(isnan(valid)), 0);
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ASSERT_FALSE(bits.is_nan());
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}
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bits.set_biased_exponent(0);
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bits.set_implicit_bit(1);
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for (unsigned int i = 0; i < COUNT; ++i) {
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// If exponent is zero, then the number is a valid but denormal value.
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bits.set_mantissa(i);
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long double valid = bits.get_val();
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ASSERT_EQ(static_cast<int>(isnan(valid)), 0);
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ASSERT_FALSE(bits.is_nan());
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}
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bits.set_biased_exponent(0);
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bits.set_implicit_bit(0);
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for (unsigned int i = 0; i < COUNT; ++i) {
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// If exponent is zero, then the number is a valid but denormal value.
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bits.set_mantissa(i);
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long double valid = bits.get_val();
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ASSERT_EQ(static_cast<int>(isnan(valid)), 0);
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ASSERT_FALSE(bits.is_nan());
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}
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}
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