libc/test/src/__support/str_to_float_test.cpp

   1 //===-- Unittests for str_to_float<float> ---------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/__support/macros/config.h"
  10 #include "str_to_fp_test.h"
  11
  12 namespace LIBC_NAMESPACE_DECL {
  13
  14 using LlvmLibcStrToFltTest = LlvmLibcStrToFloatTest<float>;
  15
  16 TEST_F(LlvmLibcStrToFltTest, ClingerFastPathFloat32Simple) {
  17   clinger_fast_path_test(123, 0, 0xf60000, 133);
  18   clinger_fast_path_test(1234567, 1, 0xbc6146, 150);
  19   clinger_fast_path_test(12345, -5, 0xfcd35b, 123);
  20 }
  21
  22 TEST_F(LlvmLibcStrToFltTest, ClingerFastPathFloat32ExtendedExp) {
  23   clinger_fast_path_test(1, 15, 0xe35fa9, 176);
  24   clinger_fast_path_test(1, 17, 0xb1a2bc, 183);
  25   clinger_fast_path_fails_test(10, 17);
  26   clinger_fast_path_fails_test(1, 50);
  27 }
  28
  29 TEST_F(LlvmLibcStrToFltTest, ClingerFastPathFloat32NegativeExp) {
  30   clinger_fast_path_test(1, -5, 0xa7c5ac, 110);
  31   clinger_fast_path_test(1, -10, 0xdbe6ff, 93);
  32   clinger_fast_path_fails_test(1, -15);
  33 }
  34
  35 // Check the fallback states for the algorithm:
  36 TEST_F(LlvmLibcStrToFltTest, EiselLemireFallbackStates) {
  37   // This number can't be evaluated by Eisel-Lemire since it's exactly 1024 away
  38   // from both of its closest floating point approximations
  39   // (12345678901234548736 and 12345678901234550784)
  40   ASSERT_FALSE(internal::eisel_lemire<float>({20040229, 0}).has_value());
  41 }
  42
  43 TEST_F(LlvmLibcStrToFltTest, SimpleDecimalConversion32SpecificFailures) {
  44   simple_decimal_conversion_test(
  45       "1.4012984643248170709237295832899161312802619418765e-45", 0x1, 0,
  46       ERANGE);
  47   simple_decimal_conversion_test(
  48       "7."
  49       "006492321624085354618647916449580656401309709382578858785341419448955413"
  50       "42930300743319094181060791015625e-46",
  51       0x0, 0, ERANGE);
  52 }
  53
  54 TEST(LlvmLibcStrToFltTest, SimpleDecimalConversionExtraTypes) {
  55   uint32_t float_output_mantissa = 0;
  56   uint32_t output_exp2 = 0;
  57
  58   LIBC_NAMESPACE::libc_errno = 0;
  59   auto float_result =
  60       internal::simple_decimal_conversion<float>("123456789012345678900");
  61   float_output_mantissa = float_result.num.mantissa;
  62   output_exp2 = float_result.num.exponent;
  63   EXPECT_EQ(float_output_mantissa, uint32_t(0xd629d4));
  64   EXPECT_EQ(output_exp2, uint32_t(193));
  65   EXPECT_EQ(float_result.error, 0);
  66 }
  67
  68 } // namespace LIBC_NAMESPACE_DECL