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Differential D147474

[libc] fix strtofloat on large exponents
ClosedPublic

Authored by michaelrj on Apr 3 2023, 2:04 PM.

Details

Reviewers
sivachandra
lntue
Commits
rGcc65ecfd08fb: [libc] fix strtofloat on large exponents
Summary

Previously if you specified an exponent of more than 10000 in string to
float (e.g. "1e10001") it would treat it as 10000. A bug was discovered
where by having more than 10000 zeroes after a decimal point and an
exponent of more than 10000 this would cause the code to return the
incorrect value.

Diff Detail

Event Timeline

michaelrj created this revision.Apr 3 2023, 2:04 PM
Herald added projects: Restricted Project, Restricted Project. · View Herald TranscriptApr 3 2023, 2:04 PM
Herald added subscribers: libc-commits, ecnelises, tschuett. · View Herald Transcript
michaelrj requested review of this revision.Apr 3 2023, 2:04 PM
Harbormaster completed remote builds in B223431: Diff 510603.Apr 3 2023, 2:44 PM
lntue accepted this revision.Apr 3 2023, 8:26 PM
This revision is now accepted and ready to land.Apr 3 2023, 8:26 PM
Closed by commit rGcc65ecfd08fb: [libc] fix strtofloat on large exponents (authored by michaelrj). · Explain WhyApr 5 2023, 9:58 AM
This revision was automatically updated to reflect the committed changes.
michaelrj added a commit: rGcc65ecfd08fb: [libc] fix strtofloat on large exponents.

Revision Contents

PathSize
libc/
src/
__support/
41 lines
test/
src/
stdlib/
353 lines

Diff 511140

libc/src/__support/str_to_float.h

Show First 20 Lines • Show All 929 Lines • ▼ Show 20 Linesdecimal_string_to_float(const char *__restrict src, const char DECIMAL_POINT,
if (tolower(src[index]) == EXPONENT_MARKER) { if (tolower(src[index]) == EXPONENT_MARKER) {
if (src[index + 1] == '+' || src[index + 1] == '-' || if (src[index + 1] == '+' || src[index + 1] == '-' ||
isdigit(src[index + 1])) { isdigit(src[index + 1])) {
++index; ++index;
auto result = strtointeger<int32_t>(src + index, 10); auto result = strtointeger<int32_t>(src + index, 10);
if (result.has_error()) if (result.has_error())
output.error = result.error; output.error = result.error;
int32_t add_to_exponent = result.value; int32_t add_to_exponent = result.value;
if (add_to_exponent > 100000)
add_to_exponent = 100000;
else if (add_to_exponent < -100000)
add_to_exponent = -100000;
index += result.parsed_len; index += result.parsed_len;
exponent += add_to_exponent;
// Here we do this operation as int64 to avoid overflow.
int64_t temp_exponent = static_cast<int64_t>(exponent) +
static_cast<int64_t>(add_to_exponent);
// If the result is in the valid range, then we use it. The valid range is
// also within the int32 range, so this prevents overflow issues.
if (temp_exponent < fputil::FPBits<T>::MAX_EXPONENT &&
temp_exponent > -fputil::FPBits<T>::MAX_EXPONENT) {
exponent = static_cast<int32_t>(temp_exponent);
} else if (temp_exponent > fputil::FPBits<T>::MAX_EXPONENT) {
exponent = fputil::FPBits<T>::MAX_EXPONENT;
} else {
exponent = -fputil::FPBits<T>::MAX_EXPONENT;
}
} }
} }
output.parsed_len = index; output.parsed_len = index;
if (mantissa == 0) { // if we have a 0, then also 0 the exponent. if (mantissa == 0) { // if we have a 0, then also 0 the exponent.
output.value = {0, 0}; output.value = {0, 0};
} else { } else {
auto temp = auto temp =
▲ Show 20 Lines • Show All 78 Lines • ▼ Show 20 Lines if (tolower(src[index]) == EXPONENT_MARKER) {
if (src[index + 1] == '+' || src[index + 1] == '-' || if (src[index + 1] == '+' || src[index + 1] == '-' ||
isdigit(src[index + 1])) { isdigit(src[index + 1])) {
++index; ++index;
auto result = strtointeger<int32_t>(src + index, 10); auto result = strtointeger<int32_t>(src + index, 10);
if (result.has_error()) if (result.has_error())
output.error = result.error; output.error = result.error;
int32_t add_to_exponent = result.value; int32_t add_to_exponent = result.value;
if (add_to_exponent > 100000)
add_to_exponent = 100000;
else if (add_to_exponent < -100000)
add_to_exponent = -100000;
index += result.parsed_len; index += result.parsed_len;
exponent += add_to_exponent;
// Here we do this operation as int64 to avoid overflow.
int64_t temp_exponent = static_cast<int64_t>(exponent) +
static_cast<int64_t>(add_to_exponent);
// If the result is in the valid range, then we use it. The valid range is
// also within the int32 range, so this prevents overflow issues.
if (temp_exponent < fputil::FPBits<T>::MAX_EXPONENT &&
temp_exponent > -fputil::FPBits<T>::MAX_EXPONENT) {
exponent = static_cast<int32_t>(temp_exponent);
} else if (temp_exponent > fputil::FPBits<T>::MAX_EXPONENT) {
exponent = fputil::FPBits<T>::MAX_EXPONENT;
} else {
exponent = -fputil::FPBits<T>::MAX_EXPONENT;
}
} }
} }
output.parsed_len = index; output.parsed_len = index;
if (mantissa == 0) { // if we have a 0, then also 0 the exponent. if (mantissa == 0) { // if we have a 0, then also 0 the exponent.
output.value.exponent = 0; output.value.exponent = 0;
output.value.mantissa = 0; output.value.mantissa = 0;
} else { } else {
auto temp = binary_exp_to_float<T>({mantissa, exponent}, truncated, round); auto temp = binary_exp_to_float<T>({mantissa, exponent}, truncated, round);
▲ Show 20 Lines • Show All 158 Lines • Show Last 20 Lines

libc/test/src/stdlib/strtod_test.cpp

Show First 20 Lines • Show All 190 Lines • ▼ Show 20 Lines run_test("-NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNKNNNNNNNNNNNNNNNNNN?"
"NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN?", "NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN?",
0, uint64_t(0)); 0, uint64_t(0));
run_test("0x.666E40", 9, uint64_t(0x3fd99b9000000000)); run_test("0x.666E40", 9, uint64_t(0x3fd99b9000000000));
// glibc version 2.36 and higher (not tested with lower versions) disagrees // glibc version 2.36 and higher (not tested with lower versions) disagrees
// with this result, but ours is correct for the nearest rounding mode. See // with this result, but ours is correct for the nearest rounding mode. See
// this bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30220 // this bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30220
run_test("0x30000002222225p-1077", 22, uint64_t(0x0006000000444445), ERANGE); run_test("0x30000002222225p-1077", 22, uint64_t(0x0006000000444445), ERANGE);
// This bug was in the handling of very large exponents in the exponent
// marker. Previously anything greater than 10,000 would be set to 10,000.
// This caused incorrect behavior if there were more than 10,000 '0's in the
// input number, and then a correspondingly large exponent. This test case has
// 24,744 zeroes.
run_test(
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24755, uint64_t(0x7ff0000000000000), ERANGE);
} }