/* { dg-do compile } */
/* { dg-options "-fdump-tree-crc -O2" } */

#include <stdint.h>

uint16_t not_crcu8 (uint8_t *data, uint16_t crc) {
  uint8_t x16 = 0, carry = 0;
  for (uint8_t i = 0, j=4; i < 8; i++, j+=2) {
      x16 = (uint8_t) (((uint8_t) crc & 1)  ^ (j & 1));
      *data >>= 1;
      if (x16 == 1) {
	  crc ^= 0x4002;
	  carry = 1;
	} else
	carry = 0;
      crc >>= 1;
      if (carry)
	crc |= 0x8000;
      else
	crc &= 0x7fff;
    }
  return crc;
}

/* { dg-final { scan-tree-dump-times "calculates CRC!" 0 "crc" } } */