Export of internal Abseil changes

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510cd0bc2ff9cf21e1e960264d179fa333a88612 by Derek Mauro <dmauro@google.com>:

Removes the static initializer for VDSOSupport as requested by Chromium.
The call is moved to InitializeSymbolizer().

PiperOrigin-RevId: 319275021

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0c91944889ad2bd10bc8080f4cd8083ca1d5de46 by Derek Mauro <dmauro@google.com>:

Check for the lock_returned attribute before using it

PiperOrigin-RevId: 319273193

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1001fa71bfb850f00502777f787aeff6e80654ca by Derek Mauro <dmauro@google.com>:

Remove a no longer relevant MSVC code guard

PiperOrigin-RevId: 319266085

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a80caee79eb3f377c6bf97bec6b692c55169fe53 by Abseil Team <absl-team@google.com>:

Bug fix to StrFormat %a rounding behavior for `long double`.

PiperOrigin-RevId: 319238900

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fdec318c449f1ca586145397099b03d973b738c4 by Abseil Team <absl-team@google.com>:

Add test cases for absl::Time +/- absl::InfiniteDuration() ==
absl::Infinite{Future|Past}.

PiperOrigin-RevId: 319223053
GitOrigin-RevId: 510cd0bc2ff9cf21e1e960264d179fa333a88612
Change-Id: I4b8932fb0ec6ab9c868450faf4ed837092a7c0c0

1 files changed, 7 insertions, 7 deletions

diff --git a/absl/strings/internal/str_format/float_conversion.cc b/absl/strings/internal/str_format/float_conversion.cc
index 6eb7b9fc..cafa479b 100644
--- a/absl/strings/internal/str_format/float_conversion.cc
+++ b/absl/strings/internal/str_format/float_conversion.cc
@@ -738,7 +738,8 @@ constexpr int HexFloatLeadingDigitSizeInBits() {
 // point that is not followed by 800000..., it disregards the parity and rounds
 // up if > 8 and rounds down if < 8.
 template <typename Int>
-bool HexFloatNeedsRoundUp(Int mantissa, int final_nibble_displayed) {
+bool HexFloatNeedsRoundUp(Int mantissa, int final_nibble_displayed,
+                          uint8_t leading) {
   // If the last nibble (hex digit) to be displayed is the lowest on in the
   // mantissa then that means that we don't have any further nibbles to inform
   // rounding, so don't round.
@@ -755,11 +756,10 @@ bool HexFloatNeedsRoundUp(Int mantissa, int final_nibble_displayed) {
     return mantissa_up_to_rounding_nibble_inclusive > eight;
   }
   // Nibble in question == 8.
-  uint8_t should_round_at_8 =
-      (final_nibble_displayed >= kTotalNibbles)
-          ? true
-          : (GetNibble(mantissa, final_nibble_displayed) % 2 == 1);
-  return should_round_at_8;
+  uint8_t round_if_odd = (final_nibble_displayed == kTotalNibbles)
+                             ? leading
+                             : GetNibble(mantissa, final_nibble_displayed);
+  return round_if_odd % 2 == 1;
 }
 
 // Stores values associated with a Float type needed by the FormatA
@@ -788,7 +788,7 @@ void FormatARound(bool precision_specified, const FormatState &state,
   // Index of the last nibble that we could display given precision.
   int final_nibble_displayed =
       precision_specified ? std::max(0, (kTotalNibbles - state.precision)) : 0;
-  if (HexFloatNeedsRoundUp(*mantissa, final_nibble_displayed)) {
+  if (HexFloatNeedsRoundUp(*mantissa, final_nibble_displayed, *leading)) {
     // Need to round up.
     bool overflow = IncrementNibble(final_nibble_displayed, mantissa);
     *leading += (overflow ? 1 : 0);