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Is there a function (SSEx intrinsics is OK) which will fill the memory with a specified int32_t value? For instance, when this value is equal to 0xAABBCC00 the result memory should look like: AABBCC00AABBCC00AABBCC00AABBCC00AABBCC00 AABBCC00AABBCC00AABBCC00AABBCC00AABBCC00 AABBCC00AABBCC00AABBCC00AABBCC00AABBCC00 AABBCC00AABBCC00AABBCC00AABBCC00AABBCC00 ... I could use std::fill or simple for-loop, but it is not fast enough. Resizing of a vector performed only once in the beginning of program, this is not an issue. The bottleneck is filling the memory. Simplified code: struct X { typedef std::vector<int32_t> int_vec_t; int_vec_t buffer; X() : buffer( 5000000 ) { /* some more action */ } ~X() { /* some code here */ } // the following function is called 25 times per second const int_vec_t& process( int32_t background, const SOME_DATA& data ); }; const X::int_vec_t& X::process( int32_t background, const SOME_DATA& data ) { // the following one string takes 30% of total time of #process function std::fill( buffer.begin(), buffer.end(), background ); // some processing // ... return buffer; }

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