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pull/853/head^2
Jeffrey Walton 2019-06-09 12:52:10 -04:00
parent 570a8e1b36
commit 0ea4354157
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integer.cpp
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@ -18,13 +18,13 @@
// For Integer::Zero(), Integer::One() and Integer::Two(), we use one of three
// strategies. First, if initialization priorities are available then we use
// them. Initialization priorities are init_priority() on Linux and init_seg()
// on Windows. AIX, OS X and several other platforms lack them. Initialization
// on Windows. OS X and several other platforms lack them. Initialization
// priorities are platform specific but they are also the most trouble free
// with determisitic destruction.
// Second, if C++11 dynamic initialization is available, then we use it. After
// the std::call_once fiasco we dropped the priority dynamic initialization
// to avoid unknown troubles platforms that are tested less frequently. In
// addition Microsoft platforms mostly do not provide dynamic initialization.
// the std::call_once fiasco we moved to dynamic initialization to avoid
// unknown troubles platforms that are tested less frequently. In addition
// Microsoft platforms mostly do not provide dynamic initialization.
// The MSDN docs claim they do but they don't in practice because we need
// Visual Studio 2017 and Windows 10 or above.
// Third, we fall back to Wei's original code of a Singleton. Wei's original
@ -47,9 +47,9 @@
// Java or .Net then Singleton must be avoided at all costs.
//
// The code below has a path cut-in for BMI2 using mulx and adcx instructions.
// There was a modest speedup of approximately 0.03 ms in Integer operations.
// We had to disable BMI2 for the moment because some OS X machines were
// advertising BMI/BMI2 support but caused SIGILL's at runtime. Also see
// There was a modest speedup of approximately 0.03 ms in public key Integer
// operations. We had to disable BMI2 for the moment because some OS X machines
// were advertising BMI/BMI2 support but caused SIGILL's at runtime. Also see
// https://github.com/weidai11/cryptopp/issues/850.
#include "pch.h"