//When writing to the AS5047, MSB has to be an Even parity bit static uint16 add_even_parity_msb(uint16 word) { uint16 ret = 0; //__builtin_parity() returns 0 for even, 1 for odd // MSB = 1 when it's odd if(__builtin_parity((int)word)) { ret = (word | PARITY_1); } else { ret = (word & PARITY_0); } return ret; }
esp_err_t esp_flash_encrypt_check_and_update(void) { uint32_t efuse_blk0 = REG_READ(EFUSE_BLK0_RDATA0_REG); ESP_LOGV(TAG, "efuse_blk0 raw value %08x", efuse_blk0); uint32_t flash_crypt_cnt = (efuse_blk0 & EFUSE_RD_FLASH_CRYPT_CNT_M) >> EFUSE_RD_FLASH_CRYPT_CNT_S; bool flash_crypt_wr_dis = efuse_blk0 & EFUSE_WR_DIS_FLASH_CRYPT_CNT; ESP_LOGV(TAG, "efuse FLASH_CRYPT_CNT 0x%x WR_DIS_FLASH_CRYPT_CNT 0x%x", flash_crypt_cnt, flash_crypt_wr_dis); if (__builtin_parity(flash_crypt_cnt) == 1) { /* Flash is already encrypted */ int left = (7 - __builtin_popcount(flash_crypt_cnt)) / 2; if (flash_crypt_wr_dis) { left = 0; /* can't update FLASH_CRYPT_CNT, no more flashes */ } ESP_LOGI(TAG, "flash encryption is enabled (%d plaintext flashes left)", left); return ESP_OK; } else { /* Flash is not encrypted, so encrypt it! */ return encrypt_flash_contents(flash_crypt_cnt, flash_crypt_wr_dis); } }
int __paritysi2 (uSI x) { return __builtin_parity (x); }
char ctz5[__builtin_ctzl(0x10L) == 4 ? 1 : -1]; char ctz6[__builtin_ctzll(0x100LL) == 8 ? 1 : -1]; char ctz7[__builtin_ctzs(1 << (BITSIZE(short) - 1)) == BITSIZE(short) - 1 ? 1 : -1]; char popcount1[__builtin_popcount(0) == 0 ? 1 : -1]; char popcount2[__builtin_popcount(0xF0F0) == 8 ? 1 : -1]; char popcount3[__builtin_popcount(~0) == BITSIZE(int) ? 1 : -1]; char popcount4[__builtin_popcount(~0L) == BITSIZE(int) ? 1 : -1]; char popcount5[__builtin_popcountl(0L) == 0 ? 1 : -1]; char popcount6[__builtin_popcountl(0xF0F0L) == 8 ? 1 : -1]; char popcount7[__builtin_popcountl(~0L) == BITSIZE(long) ? 1 : -1]; char popcount8[__builtin_popcountll(0LL) == 0 ? 1 : -1]; char popcount9[__builtin_popcountll(0xF0F0LL) == 8 ? 1 : -1]; char popcount10[__builtin_popcountll(~0LL) == BITSIZE(long long) ? 1 : -1]; char parity1[__builtin_parity(0) == 0 ? 1 : -1]; char parity2[__builtin_parity(0xb821) == 0 ? 1 : -1]; char parity3[__builtin_parity(0xb822) == 0 ? 1 : -1]; char parity4[__builtin_parity(0xb823) == 1 ? 1 : -1]; char parity5[__builtin_parity(0xb824) == 0 ? 1 : -1]; char parity6[__builtin_parity(0xb825) == 1 ? 1 : -1]; char parity7[__builtin_parity(0xb826) == 1 ? 1 : -1]; char parity8[__builtin_parity(~0) == 0 ? 1 : -1]; char parity9[__builtin_parityl(1L << (BITSIZE(long) - 1)) == 1 ? 1 : -1]; char parity10[__builtin_parityll(1LL << (BITSIZE(long long) - 1)) == 1 ? 1 : -1]; char ffs1[__builtin_ffs(0) == 0 ? 1 : -1]; char ffs2[__builtin_ffs(1) == 1 ? 1 : -1]; char ffs3[__builtin_ffs(0xfbe71) == 1 ? 1 : -1]; char ffs4[__builtin_ffs(0xfbe70) == 5 ? 1 : -1]; char ffs5[__builtin_ffs(1U << (BITSIZE(int) - 1)) == BITSIZE(int) ? 1 : -1];
inline unsigned int parity (unsigned int x) { return __builtin_parity (x); }
[[gnu::always_inline]] static bool x86_parity(uint64_t value) { return !__builtin_parity(static_cast<uint8_t>(value)); }
int main(int argc, char* argv[]) { unsigned int x = 41; return __builtin_parity(x); }