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c++ Programming Glossary: shiftshttp://stackoverflow.com/questions/10076011/overflow-aa-mod-n
C++ Tips for code optimization on ARM devices http://stackoverflow.com/questions/10800372/c-tips-for-code-optimization-on-arm-devices cost instructions division square root sin cos Use logical shifts to divide or multiply by 2. Multiply by the inverse when possible... you mentioned there is no divide instruction. Use logical shifts or multiply by the inverse when possible. 2 Memory is much slower.. powerful 3 operand instructions multi load store and free shifts that can outperform what the compiler is capable of generating...
http://stackoverflow.com/questions/1102692/how-to-do-alpha-blend-fast first pixel with maskCurrent 0 etc Could do better with shifts and so on but this is clear __mm128i mask _mm_set_epi8 maskCurrent..
How to add two numbers without using ++ or + or another arithmetic operator http://stackoverflow.com/questions/1149929/how-to-add-two-numbers-without-using-or-or-another-arithmetic-operator representation and implements addition using repeated shifts with a carry bit implementing other operators mostly in terms..
http://stackoverflow.com/questions/14220726/one-byte-bool-why containing byte or int or whatever and then performing bit shifts and bit mask operations to access the relevant bit. If you're..
Fastest way to scan for bit pattern in a stream of bits http://stackoverflow.com/questions/1572290/fastest-way-to-scan-for-bit-pattern-in-a-stream-of-bits There are various brute force methods using tables and or shifts but are there any bit twiddling shortcuts that can cut down..
http://stackoverflow.com/questions/15729765/why-does-the-output-of-applied-on-a-negative-number-is-filled-with-ones-on-th 0 and for all this MSB sign bit 0 . And because again you shifts right 31 times all bits excepts then sigh bit shift out and..
How can I perform multiplication without the '*' operator? http://stackoverflow.com/questions/2069488/how-can-i-perform-multiplication-without-the-operator
What belongs in an educational tool to demonstrate the unwarranted assumptions people make in C/C++? http://stackoverflow.com/questions/3457967/what-belongs-in-an-educational-tool-to-demonstrate-the-unwarranted-assumptions-p is always okay 1 BITS_PER_INT 0 int t EXPECT 09a minus shifts backwards t 1 15 t 7 pointers Suggested by jalf EXPECT 10 void..
What are all the common undefined behaviour that a C++ programmer should know about? [closed] http://stackoverflow.com/questions/367633/what-are-all-the-common-undefined-behaviour-that-a-c-programmer-should-know-ab defined Left shifting values by a negative amount right shifts by negative amounts are implementation defined Shifting values..
When is it worthwhile to use bit fields? http://stackoverflow.com/questions/4240974/when-is-it-worthwhile-to-use-bit-fields approach is to use direct bitwise manipulation using shifts and bit masks. If you use bit fields for anything other than..
Why are bitwise shifts (<< and >>) used for cout and cin? http://stackoverflow.com/questions/4854248/why-are-bitwise-shifts-and-used-for-cout-and-cin are bitwise shifts and used for cout and cin Question is in the title really I'm..
Performance of built-in types : char vs short vs int vs. float vs. double http://stackoverflow.com/questions/5069489/performance-of-built-in-types-char-vs-short-vs-int-vs-float-vs-double low complexity integer add popcount hcf boolean ops shifts high demand low complexity operations will be fast on nearly..
Is multiplication and division using shift operators in C actually faster? http://stackoverflow.com/questions/6357038/is-multiplication-and-division-using-shift-operators-in-c-actually-faster has implemented the multiply instruction as a sequence of shifts adds in microcode. Bottom line don't spend a lot of time worrying..
Is there any difference between the Java and C++ operators? http://stackoverflow.com/questions/6623888/is-there-any-difference-between-the-java-and-c-operators in C but again well defined in Java. In C performing right shifts on negative numbers is implementation defined undefined whereas..
Fastest Method to Split a 32 Bit number into Bytes in C++ http://stackoverflow.com/questions/741212/fastest-method-to-split-a-32-bit-number-into-bytes-in-c std clock std printf Execution time for assigned shifts 08u clocks n Execution time for raw shifts 08u clocks n Execution.. for assigned shifts 08u clocks n Execution time for raw shifts 08u clocks n Execution time for union 08u clocks n n assignedShiftsFinishedTime.. std clock std printf Execution time for assigned shifts 08u clocks n Execution time for raw shifts 08u clocks n Execution..
Looking for sse 128 bit shift operation for non-immediate shift value http://stackoverflow.com/questions/9980801/looking-for-sse-128-bit-shift-operation-for-non-immediate-shift-value register but is restricted to immediate shift values and shifts by bytes not bits. I can use an intrinsic like _mm_sll_epi64..
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