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/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-crc" } */
#include <stdint.h>
#define POLY (0x1070U << 3)
#define u8 uint8_t
#define u16 uint16_t
u8 crc8(u16 data) {
int i;
for (i = 0; i < 8; i++) {
if (data & 0x8000)
data = data ^ POLY;
data = data << 1;
}
return (u8)(data >> 8);
}
/* { dg-final { scan-tree-dump "Attention! crc8 function calculates CRC." "crc"} } */
/* { dg-final { scan-tree-dump "Return size is 8" "crc"} } */
/* { dg-final { scan-tree-dump "Loop iteration number is 7" "crc"} } */
/* { dg-final { scan-tree-dump "Bit forward" "crc"} } */
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