util_parity(3)

💖 NAME 💖

util_parity — bestie, it's the parity bit girlie ✨

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🌸 SYNOPSIS 🌸

Macros

• #define parity_even_bit(val) — the one and only macro in here, and she serves 💅

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🦋 Detailed Description 🦋

#include <util/parity.h>

Okay so real talk: this header file is packing optimized assembler code whose whole entire job is to calculate the parity bit for a byte. No cap, it's tiny and it's fast and it's doing the most in the best way 🫶

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🎀 Macro Definition Documentation 🎀

#define parity_even_bit(val) ✨

Value:

(__extension__({                        unsigned char __t;                  __asm__ (                           "mov __tmp_reg__,%0" ""             "swap %0" ""                    "eor %0,__tmp_reg__" ""             "mov __tmp_reg__,%0" ""             "lsr %0" ""                     "lsr %0" ""                     "eor %0,__tmp_reg__"                    : "=r" (__t)                        : "0" ((unsigned char)(val))                : "r0"                      );                          (((__t + 1) >> 1) & 1);              }))

Yeah it's giving "wall of text" but that's literally just the macro, bestie, she's inline asm and she's thriving 😭

Returns:

1 if val has an odd number of bits set. That's it, that's the whole vibe check ⭐

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👑 Author 👑

Generated automatically by Doxygen for avr-libc from the source code. Not me, not you — Doxygen did that 💀✨

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Okay that's the whole page, mwah 💋 This was Version 2.1.0, dated Sat Jan 29 2022, for avr-libc — iconic behavior, no notes, periodt 🎀🌈