| //===-- Unittests for exp2f -----------------------------------------------===// |
| // |
| // 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 "src/__support/FPUtil/FPBits.h" |
| #include "src/math/exp2f.h" |
| #include "utils/MPFRWrapper/MPFRUtils.h" |
| #include "utils/UnitTest/FPMatcher.h" |
| #include "utils/UnitTest/Test.h" |
| #include <math.h> |
| |
| #include <errno.h> |
| #include <stdint.h> |
| |
| namespace mpfr = __llvm_libc::testing::mpfr; |
| |
| DECLARE_SPECIAL_CONSTANTS(float) |
| |
| TEST(LlvmLibcExp2fTest, SpecialNumbers) { |
| errno = 0; |
| |
| EXPECT_FP_EQ(aNaN, __llvm_libc::exp2f(aNaN)); |
| EXPECT_EQ(errno, 0); |
| |
| EXPECT_FP_EQ(inf, __llvm_libc::exp2f(inf)); |
| EXPECT_EQ(errno, 0); |
| |
| EXPECT_FP_EQ(0.0f, __llvm_libc::exp2f(negInf)); |
| EXPECT_EQ(errno, 0); |
| |
| EXPECT_FP_EQ(1.0f, __llvm_libc::exp2f(0.0f)); |
| EXPECT_EQ(errno, 0); |
| |
| EXPECT_FP_EQ(1.0f, __llvm_libc::exp2f(-0.0f)); |
| EXPECT_EQ(errno, 0); |
| } |
| |
| TEST(LlvmLibcExpfTest, Overflow) { |
| errno = 0; |
| EXPECT_FP_EQ(inf, __llvm_libc::exp2f(float(FPBits(0x7f7fffffU)))); |
| EXPECT_EQ(errno, ERANGE); |
| |
| errno = 0; |
| EXPECT_FP_EQ(inf, __llvm_libc::exp2f(float(FPBits(0x43000000U)))); |
| EXPECT_EQ(errno, ERANGE); |
| |
| errno = 0; |
| EXPECT_FP_EQ(inf, __llvm_libc::exp2f(float(FPBits(0x43000001U)))); |
| EXPECT_EQ(errno, ERANGE); |
| } |
| |
| // Test with inputs which are the borders of underflow/overflow but still |
| // produce valid results without setting errno. |
| TEST(LlvmLibcExpfTest, Borderline) { |
| float x; |
| |
| errno = 0; |
| x = float(FPBits(0x42fa0001U)); |
| EXPECT_MPFR_MATCH(mpfr::Operation::Exp2, x, __llvm_libc::exp2f(x), 1.0); |
| EXPECT_EQ(errno, 0); |
| |
| x = float(FPBits(0x42ffffffU)); |
| EXPECT_MPFR_MATCH(mpfr::Operation::Exp2, x, __llvm_libc::exp2f(x), 1.0); |
| EXPECT_EQ(errno, 0); |
| |
| x = float(FPBits(0xc2fa0001U)); |
| EXPECT_MPFR_MATCH(mpfr::Operation::Exp2, x, __llvm_libc::exp2f(x), 1.0); |
| EXPECT_EQ(errno, 0); |
| |
| x = float(FPBits(0xc2fc0000U)); |
| EXPECT_MPFR_MATCH(mpfr::Operation::Exp2, x, __llvm_libc::exp2f(x), 1.0); |
| EXPECT_EQ(errno, 0); |
| |
| x = float(FPBits(0xc2fc0001U)); |
| EXPECT_MPFR_MATCH(mpfr::Operation::Exp2, x, __llvm_libc::exp2f(x), 1.0); |
| EXPECT_EQ(errno, 0); |
| |
| x = float(FPBits(0xc3150000U)); |
| EXPECT_MPFR_MATCH(mpfr::Operation::Exp2, x, __llvm_libc::exp2f(x), 1.0); |
| EXPECT_EQ(errno, 0); |
| } |
| |
| TEST(LlvmLibcExpfTest, Underflow) { |
| errno = 0; |
| EXPECT_FP_EQ(0.0f, __llvm_libc::exp2f(float(FPBits(0xff7fffffU)))); |
| EXPECT_EQ(errno, ERANGE); |
| |
| errno = 0; |
| float x = float(FPBits(0xc3158000U)); |
| EXPECT_MPFR_MATCH(mpfr::Operation::Exp2, x, __llvm_libc::exp2f(x), 1.0); |
| EXPECT_EQ(errno, ERANGE); |
| |
| errno = 0; |
| x = float(FPBits(0xc3165432U)); |
| EXPECT_MPFR_MATCH(mpfr::Operation::Exp2, x, __llvm_libc::exp2f(x), 1.0); |
| EXPECT_EQ(errno, ERANGE); |
| } |
| |
| TEST(LlvmLibcexp2fTest, InFloatRange) { |
| constexpr uint32_t count = 1000000; |
| constexpr uint32_t step = UINT32_MAX / count; |
| for (uint32_t i = 0, v = 0; i <= count; ++i, v += step) { |
| float x = float(FPBits(v)); |
| if (isnan(x) || isinf(x)) |
| continue; |
| errno = 0; |
| float result = __llvm_libc::exp2f(x); |
| |
| // If the computation resulted in an error or did not produce valid result |
| // in the single-precision floating point range, then ignore comparing with |
| // MPFR result as MPFR can still produce valid results because of its |
| // wider precision. |
| if (isnan(result) || isinf(result) || errno != 0) |
| continue; |
| ASSERT_MPFR_MATCH(mpfr::Operation::Exp2, x, __llvm_libc::exp2f(x), 1.0); |
| } |
| } |