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//===-- Unittests for strtof ----------------------------------------------===//
//
// 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/stdlib/strtof.h"
#include "test/UnitTest/ErrnoCheckingTest.h"
#include "test/UnitTest/FPMatcher.h"
#include "test/UnitTest/RoundingModeUtils.h"
#include "test/UnitTest/Test.h"
#include <stddef.h>
using LIBC_NAMESPACE::fputil::testing::ForceRoundingModeTest;
using LIBC_NAMESPACE::fputil::testing::RoundingMode;
class LlvmLibcStrToFTest : public LIBC_NAMESPACE::testing::ErrnoCheckingTest,
ForceRoundingModeTest<RoundingMode::Nearest> {
public:
void run_test(const char *inputString, const ptrdiff_t expectedStrLen,
const uint32_t expectedRawData, const int expectedErrno = 0) {
// expectedRawData is the expected float result as a uint32_t, organized
// according to IEEE754:
//
// +-- 1 Sign Bit +-- 23 Mantissa bits
// | |
// | +----------+----------+
// | | |
// SEEEEEEEEMMMMMMMMMMMMMMMMMMMMMMM
// | |
// +--+---+
// |
// +-- 8 Exponent Bits
//
// This is so that the result can be compared in parts.
char *str_end = nullptr;
LIBC_NAMESPACE::fputil::FPBits<float> expected_fp =
LIBC_NAMESPACE::fputil::FPBits<float>(expectedRawData);
float result = LIBC_NAMESPACE::strtof(inputString, &str_end);
EXPECT_EQ(str_end - inputString, expectedStrLen);
EXPECT_FP_EQ(result, expected_fp.get_val());
ASSERT_ERRNO_EQ(expectedErrno);
}
};
// This is the set of tests that I have working (verified correct when compared
// to system libc). This is here so I don't break more things when I try to fix
// them.
TEST_F(LlvmLibcStrToFTest, BasicDecimalTests) {
run_test("1", 1, 0x3f800000);
run_test("123", 3, 0x42f60000);
run_test("1234567890", 10, 0x4e932c06u);
run_test("123456789012345678901", 21, 0x60d629d4);
run_test("0.1", 3, 0x3dcccccdu);
run_test(".1", 2, 0x3dcccccdu);
run_test("-0.123456789", 12, 0xbdfcd6eau);
run_test("0.11111111111111111111", 22, 0x3de38e39u);
run_test("0.0000000000000000000000001", 27, 0x15f79688u);
}
TEST_F(LlvmLibcStrToFTest, DecimalOutOfRangeTests) {
run_test("555E36", 6, 0x7f800000, ERANGE);
run_test("1e-10000", 8, 0x0, ERANGE);
}
TEST_F(LlvmLibcStrToFTest, DecimalsWithRoundingProblems) {
run_test("20040229", 8, 0x4b98e512);
run_test("20040401", 8, 0x4b98e568);
run_test("9E9", 3, 0x50061c46);
}
TEST_F(LlvmLibcStrToFTest, DecimalSubnormals) {
run_test("1.4012984643248170709237295832899161312802619418765e-45", 55, 0x1,
ERANGE);
}
TEST_F(LlvmLibcStrToFTest, DecimalWithLongExponent) {
run_test("1e2147483648", 12, 0x7f800000, ERANGE);
run_test("1e2147483646", 12, 0x7f800000, ERANGE);
run_test("100e2147483646", 14, 0x7f800000, ERANGE);
run_test("1e-2147483647", 13, 0x0, ERANGE);
run_test("1e-2147483649", 13, 0x0, ERANGE);
}
TEST_F(LlvmLibcStrToFTest, BasicHexadecimalTests) {
run_test("0x1", 3, 0x3f800000);
run_test("0x10", 4, 0x41800000);
run_test("0x11", 4, 0x41880000);
run_test("0x0.1234", 8, 0x3d91a000);
}
TEST_F(LlvmLibcStrToFTest, HexadecimalSubnormalTests) {
run_test("0x0.0000000000000000000000000000000002", 38, 0x4000, ERANGE);
// This is the largest subnormal number as represented in hex
run_test("0x0.00000000000000000000000000000003fffff8", 42, 0x7fffff, ERANGE);
}
TEST_F(LlvmLibcStrToFTest, HexadecimalSubnormalRoundingTests) {
// This is the largest subnormal number that gets rounded down to 0 (as a
// float)
run_test("0x0.00000000000000000000000000000000000004", 42, 0x0, ERANGE);
// This is slightly larger, and thus rounded up
run_test("0x0.000000000000000000000000000000000000041", 43, 0x00000001,
ERANGE);
// These check that we're rounding to even properly
run_test("0x0.0000000000000000000000000000000000000b", 42, 0x00000001,
ERANGE);
run_test("0x0.0000000000000000000000000000000000000c", 42, 0x00000002,
ERANGE);
// These check that we're rounding to even properly even when the input bits
// are longer than the bit fields can contain.
run_test("0x1.000000000000000000000p-150", 30, 0x00000000, ERANGE);
run_test("0x1.000010000000000001000p-150", 30, 0x00000001, ERANGE);
run_test("0x1.000100000000000001000p-134", 30, 0x00008001, ERANGE);
run_test("0x1.FFFFFC000000000001000p-127", 30, 0x007FFFFF, ERANGE);
run_test("0x1.FFFFFE000000000000000p-127", 30, 0x00800000);
}
TEST_F(LlvmLibcStrToFTest, HexadecimalNormalRoundingTests) {
// This also checks the round to even behavior by checking three adjacent
// numbers.
// This gets rounded down to even
run_test("0x123456500", 11, 0x4f91a2b2);
// This doesn't get rounded at all
run_test("0x123456600", 11, 0x4f91a2b3);
// This gets rounded up to even
run_test("0x123456700", 11, 0x4f91a2b4);
// Correct rounding for long input
run_test("0x1.000001000000000000000", 25, 0x3f800000);
run_test("0x1.000001000000000000100", 25, 0x3f800001);
}
TEST_F(LlvmLibcStrToFTest, HexadecimalsWithRoundingProblems) {
run_test("0xFFFFFFFF", 10, 0x4f800000);
}
TEST_F(LlvmLibcStrToFTest, HexadecimalOutOfRangeTests) {
run_test("0x123456789123456789123456789123456789", 38, 0x7f800000, ERANGE);
run_test("-0x123456789123456789123456789123456789", 39, 0xff800000, ERANGE);
run_test("0x0.00000000000000000000000000000000000001", 42, 0x0, ERANGE);
}
TEST_F(LlvmLibcStrToFTest, InfTests) {
run_test("INF", 3, 0x7f800000);
run_test("INFinity", 8, 0x7f800000);
run_test("infnity", 3, 0x7f800000);
run_test("infinit", 3, 0x7f800000);
run_test("infinfinit", 3, 0x7f800000);
run_test("innf", 0, 0x0);
run_test("-inf", 4, 0xff800000);
run_test("-iNfInItY", 9, 0xff800000);
}
TEST_F(LlvmLibcStrToFTest, SimpleNaNTests) {
run_test("NaN", 3, 0x7fc00000);
run_test("-nAn", 4, 0xffc00000);
}
// These NaNs are of the form `NaN(n-character-sequence)` where the
// n-character-sequence is 0 or more letters or numbers. If there is anything
// other than a letter or a number, then the valid number is just `NaN`. If
// the sequence is valid, then the interpretation of them is implementation
// defined, in this case it's passed to strtoll with an automatic base, and
// the result is put into the mantissa if it takes up the whole width of the
// parentheses.
TEST_F(LlvmLibcStrToFTest, NaNWithParenthesesEmptyTest) {
run_test("NaN()", 5, 0x7fc00000);
}
TEST_F(LlvmLibcStrToFTest, NaNWithParenthesesValidNumberTests) {
run_test("NaN(1234)", 9, 0x7fc004d2);
run_test("NaN(0x1234)", 11, 0x7fc01234);
run_test("NaN(01234)", 10, 0x7fc0029c);
}
TEST_F(LlvmLibcStrToFTest, NaNWithParenthesesInvalidSequenceTests) {
run_test("NaN( 1234)", 3, 0x7fc00000);
run_test("NaN(-1234)", 3, 0x7fc00000);
run_test("NaN(asd&f)", 3, 0x7fc00000);
run_test("NaN(123 )", 3, 0x7fc00000);
run_test("NaN(123+asdf)", 3, 0x7fc00000);
run_test("NaN(123", 3, 0x7fc00000);
}
TEST_F(LlvmLibcStrToFTest, NaNWithParenthesesValidSequenceInvalidNumberTests) {
run_test("NaN(1a)", 7, 0x7fc00000);
run_test("NaN(asdf)", 9, 0x7fc00000);
run_test("NaN(1A1)", 8, 0x7fc00000);
run_test("NaN(underscores_are_ok)", 23, 0x7fc00000);
run_test(
"NaN(1234567890qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM_)",
68, 0x7fc00000);
}
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