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App Inventor 2 拓展参考文档 · App Inventor 2 中文网

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App Inventor 2 拓展参考文档 · App Inventor 2 中文网

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Popup弹出菜单扩展 · App Inventor 2 中文网

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How to count the number of set bits in a 32-bit integer?

... ret unsigned test_u64(unsigned long long a) { return popcount(a); } xor eax, eax # gcc avoids false dependencies for Intel CPUs popcnt rax, rdi ret PowerPC64 gcc -O3 -std=gnu++11 emits (for the int arg version): rldicl 3,3,0,32 # zero-extend from 32 to 64-bit p...

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Approximate cost to access various caches and main memory?

...-------------------------- 0.1 ns - NOP 0.3 ns - XOR, ADD, SUB 0.5 ns - CPU L1 dCACHE reference (1st introduced in late 80-ies ) 0.9 ns - JMP SHORT 1 ns - speed-of-light (a photon) travel a 1 ft (30.5cm) distance -- will st...

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