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Export of internal Abseil changes

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d8ddeda8e52132b908fae89b25f117a055d78c04 by Abseil Team <absl-team@google.com>:

Improve performance of ByteStringFromAscii by changing kHexValue to have -1 in invalid value slots. This way a single load can do both the validation and conversion.

PiperOrigin-RevId: 284167344

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5037e97e2eaaac8ced9a5290949deda4b43b9ceb by Mark Barolak <mbar@google.com>:

Change the underlying symbol name of Cord to absl::Cord.

PiperOrigin-RevId: 284005429

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4ef66c72aedf135f2b4fd0ba7a73de6642decfff by Abseil Team <absl-team@google.com>:

Eliminate an unnecessary load when futex is contended in Waiter::Wait()

The first argument to compare_exchange_weak() is a reference and will be
updated upon failure.  There is no need to do an additional load on the
same variable.

PiperOrigin-RevId: 284002752
GitOrigin-RevId: d8ddeda8e52132b908fae89b25f117a055d78c04
Change-Id: Idac68a1901eb8c30050adc3860765b1a6fa085c7
This commit is contained in:
Abseil Team 2019-12-06 05:36:40 -08:00 • committed by Mark Barolak
parent d659fe54b3
commit 77f87009a3
5 changed files with 14 additions and 12 deletions
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9
absl/strings/escaping.cc
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@ -961,7 +961,7 @@ bool Base64UnescapeInternal(const char* src, size_t slen, String* dest,
}
/* clang-format off */
constexpr char kHexValue[256] = {
constexpr char kHexValueLenient[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
@ -977,8 +977,9 @@ constexpr char kHexValue[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
/* clang-format on */
// This is a templated function so that T can be either a char*
@ -987,8 +988,8 @@ constexpr char kHexValue[256] = {
template <typename T>
void HexStringToBytesInternal(const char* from, T to, ptrdiff_t num) {
for (int i = 0; i < num; i++) {
to[i] = (kHexValue[from[i * 2] & 0xFF] << 4) +
(kHexValue[from[i * 2 + 1] & 0xFF]);
to[i] = (kHexValueLenient[from[i * 2] & 0xFF] << 4) +
(kHexValueLenient[from[i * 2 + 1] & 0xFF]);
}
}