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/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-crc-details" } */
#include <stdint.h>
uint32_t crc24_reverse(uint32_t crc, const uint8_t *data, uint8_t len)
{
uint32_t state = crc;
uint8_t i;
for (i = 0; i < len; i++) {
uint8_t n, cur = data[len - i - 1];
for (n = 0; n < 8; n++) {
int top_bit = state >> 23;
state = (state << 1) & 0xffffff;
state |= top_bit ^ ((cur >> (7 - n)) & 1);
if (top_bit)
state ^= 0xb4c000;
}
}
return state;
}
/* { dg-final { scan-tree-dump "crc24_reverse function maybe calculates CRC and returns it." "crc"} } */
/* { dg-final { scan-tree-dump "Return size is 32" "crc"} } */
/* { dg-final { scan-tree-dump "Loop iteration number is 7" "crc"} } */
/* { dg-final { scan-tree-dump "Bit forward" "crc"} } */
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