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GSdx: Explain TransactionScope changes

This commit is contained in:
Jonathan Li 2015-02-28 13:20:01 +00:00
parent 329953ebc3
commit 13c0e6f5ef
1 changed files with 5 additions and 0 deletions
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5
plugins/GSdx/GSThread.h
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@ -485,6 +485,11 @@ public:
TransactionScope(Lock& fallBackLock_, int max_retries = 3)
: fallBackLock(fallBackLock_)
{
// The TSX (RTM/HLE) instructions on Intel AVX2 CPUs may either be
// absent or disabled (see errata HSD136 and specification change at
// http://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/4th-gen-core-family-desktop-specification-update.pdf)
// This can cause builds for AVX2 CPUs to fail with GCC/Clang on Linux,
// so check that the RTM instructions are actually available.
#if (_M_SSE >= 0x501 && !defined(__GNUC__)) || defined(__RTM__)
int nretries = 0;