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◆ lsrX4()
|
inline |
Helper function to divide a number by 16, aka four logical shift right (LSR)'s.
On avr-gcc, "u8 >> 4" generates a loop, which is big, and slow. merely forcing it to be four /=2's causes avr-gcc to emit a SWAP instruction followed by an AND 0x0F, which is faster, and smaller.
Definition at line 586 of file colorutils.cpp.
587{
588#if defined(__AVR__)
589 dividend /= 2;
590 dividend /= 2;
591 dividend /= 2;
592 dividend /= 2;
593#else
594 dividend >>= 4;
595#endif
596 return dividend;
597}
Referenced by ColorFromPalette(), ColorFromPalette(), and ColorFromPalette().
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