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authorGravatar Abseil Team <absl-team@google.com>2018-12-04 11:01:12 -0800
committerGravatar Ashley Hedberg <ahedberg@google.com>2018-12-04 16:54:40 -0500
commitfcb104594b0bb4b8ac306cb2f55ecdad40974683 (patch)
treed2d79d246c6a894ca6716f47c15ebb7b8796b36a /absl/strings/internal/pow10_helper_test.cc
parent6c7de165d1c82684359ccb630bb5f83263fa5ebc (diff)
Creation of LTS branch "lts_2018_12_18"20181200
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Diffstat (limited to 'absl/strings/internal/pow10_helper_test.cc')
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diff --git a/absl/strings/internal/pow10_helper_test.cc b/absl/strings/internal/pow10_helper_test.cc
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+++ b/absl/strings/internal/pow10_helper_test.cc
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+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/strings/internal/pow10_helper.h"
+
+#include <cmath>
+
+#include "gtest/gtest.h"
+#include "absl/strings/str_format.h"
+
+namespace absl {
+inline namespace lts_2018_12_18 {
+namespace strings_internal {
+
+namespace {
+
+struct TestCase {
+ int power; // Testing Pow10(power)
+ uint64_t significand; // Raw bits of the expected value
+ int radix; // significand is adjusted by 2^radix
+};
+
+TEST(Pow10HelperTest, Works) {
+ // The logic in pow10_helper.cc is so simple that theoretically we don't even
+ // need a test. However, we're paranoid and believe that there may be
+ // compilers that don't round floating-point literals correctly, even though
+ // it is specified by the standard. We check various edge cases, just to be
+ // sure.
+ constexpr TestCase kTestCases[] = {
+ // Subnormals
+ {-323, 0x2, -1074},
+ {-322, 0x14, -1074},
+ {-321, 0xca, -1074},
+ {-320, 0x7e8, -1074},
+ {-319, 0x4f10, -1074},
+ {-318, 0x316a2, -1074},
+ {-317, 0x1ee257, -1074},
+ {-316, 0x134d761, -1074},
+ {-315, 0xc1069cd, -1074},
+ {-314, 0x78a42205, -1074},
+ {-313, 0x4b6695433, -1074},
+ {-312, 0x2f201d49fb, -1074},
+ {-311, 0x1d74124e3d1, -1074},
+ {-310, 0x12688b70e62b, -1074},
+ {-309, 0xb8157268fdaf, -1074},
+ {-308, 0x730d67819e8d2, -1074},
+ // Values that are very close to rounding the other way.
+ // Comment shows difference of significand from the true value.
+ {-307, 0x11fa182c40c60d, -1072}, // -.4588
+ {-290, 0x18f2b061aea072, -1016}, // .4854
+ {-276, 0x11BA03F5B21000, -969}, // .4709
+ {-259, 0x1899C2F6732210, -913}, // .4830
+ {-252, 0x1D53844EE47DD1, -890}, // -.4743
+ {-227, 0x1E5297287C2F45, -807}, // -.4708
+ {-198, 0x1322E220A5B17E, -710}, // -.4714
+ {-195, 0x12B010D3E1CF56, -700}, // .4928
+ {-192, 0x123FF06EEA847A, -690}, // .4968
+ {-163, 0x1708D0F84D3DE7, -594}, // -.4977
+ {-145, 0x13FAAC3E3FA1F3, -534}, // -.4785
+ {-111, 0x133D4032C2C7F5, -421}, // .4774
+ {-106, 0x1D5B561574765B, -405}, // -.4869
+ {-104, 0x16EF5B40C2FC77, -398}, // -.4741
+ {-88, 0x197683DF2F268D, -345}, // -.4738
+ {-86, 0x13E497065CD61F, -338}, // .4736
+ {-76, 0x17288E1271F513, -305}, // -.4761
+ {-63, 0x1A53FC9631D10D, -262}, // .4929
+ {-30, 0x14484BFEEBC2A0, -152}, // .4758
+ {-21, 0x12E3B40A0E9B4F, -122}, // -.4916
+ {-5, 0x14F8B588E368F1, -69}, // .4829
+ {23, 0x152D02C7E14AF6, 24}, // -.5000 (exactly, round-to-even)
+ {29, 0x1431E0FAE6D721, 44}, // -.4870
+ {34, 0x1ED09BEAD87C03, 60}, // -.4721
+ {70, 0x172EBAD6DDC73D, 180}, // .4733
+ {105, 0x1BE7ABD3781ECA, 296}, // -.4850
+ {126, 0x17A2ECC414A03F, 366}, // -.4999
+ {130, 0x1CDA62055B2D9E, 379}, // .4855
+ {165, 0x115D847AD00087, 496}, // -.4913
+ {172, 0x14B378469B6732, 519}, // .4818
+ {187, 0x1262DFEEBBB0F9, 569}, // -.4805
+ {210, 0x18557F31326BBB, 645}, // -.4992
+ {212, 0x1302CB5E6F642A, 652}, // -.4838
+ {215, 0x1290BA9A38C7D1, 662}, // -.4881
+ {236, 0x1F736F9B3494E9, 731}, // .4707
+ {244, 0x176EC98994F489, 758}, // .4924
+ {250, 0x1658E3AB795204, 778}, // -.4963
+ {252, 0x117571DDF6C814, 785}, // .4873
+ {254, 0x1B4781EAD1989E, 791}, // -.4887
+ {260, 0x1A03FDE214CAF1, 811}, // .4784
+ {284, 0x1585041B2C477F, 891}, // .4798
+ {304, 0x1D2A1BE4048F90, 957}, // -.4987
+ // Out-of-range values
+ {-324, 0x0, 0},
+ {-325, 0x0, 0},
+ {-326, 0x0, 0},
+ {309, 1, 2000},
+ {310, 1, 2000},
+ {311, 1, 2000},
+ };
+ for (const TestCase& test_case : kTestCases) {
+ EXPECT_EQ(Pow10(test_case.power),
+ std::ldexp(test_case.significand, test_case.radix))
+ << absl::StrFormat("Failure for Pow10(%d): %a vs %a", test_case.power,
+ Pow10(test_case.power),
+ std::ldexp(test_case.significand, test_case.radix));
+ }
+}
+
+} // namespace
+} // namespace strings_internal
+} // inline namespace lts_2018_12_18
+} // namespace absl
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