Guillaume questions

Guillaume answers

• C intrinsics, SSE2 dot product and gcc -O3 generated assembly
• C++ unions vs. reinterpret_cast
• How to initialize a bitset type all bits to 1
• How to configure libstdc++ with GCC 4.8?
• Hoisting of non-atomic loads up through acquiring atomic loads
• Why would a compiler generate this assembly?
• Atomic read with QAtomicInt/QAtomicPointer
• G++: Can __attribute__((__may_alias__)) be used for pointer to class instance rather than to class definition itself?